Patent ID: 12194712

DESCRIPTION OF EMBODIMENTS

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings attached. For description convenience, just preferred embodiments will be shown. Of course, the present invention is not limited to them.

1. Structure of Sheet Body

FIG.1shows the layer structure of a sheet body1according to an embodiment of the present invention. The sheet body1includes at least an oil-containing resin layer11and a surface resin layer12layered on one of surfaces of the oil-containing resin layer11. The sheet body1further may include: for, instance, a base material13provided on the other surface that is opposite to the one surface of the oil-containing resin layer11; an adhesive layer14provided on a surface of the base material13that is opposite to the surface on which the oil-containing resin layer11is provided; and a separator15detachably attached to an outside surface of the adhesive layer14. The separator15is peeled off upon use to expose the adhesive14, which can be attached to various structures (not shown).

(1) Oil-Containing Resin Layer

The oil-containing resin layer11contains an oil component, such as first and second oil components, and a resin component, and is a solid resin layer in which part of included oils, for instance, the second oil component can exude (bleed) from the resin component, thereby preventing icing and/or snow accretion by using the oil component exuded.

The layer thickness of the oil-containing resin layer11is not particularly limited, and preferably 10000 μm or less, more preferably 5000 μm or less, still more preferably 2500 μm or less, and particularly preferably 2000 μm or less in order to cause appropriate oil exuding. Here, in view of strength, the layer thickness is preferably 10 μm or more, more preferably 50 μm or more, still more preferably 100 μm or more, and particularly preferably 200 μm or more.

<Resin Component in Oil-Containing Resin Layer>

Examples of the resin component in the oil-containing resin layer11include, but are not particularly limited to, silicone resin, polyurethane resin, polyurethane acrylic resin, vinyl chloride resin, polyester resin, elastomers, fluororesin, polyamide resin, polyolefin resin (e.g., polyethylene, polypropylene), or acrylic resin. From the viewpoint of an oil component bleeding effect and excellent outdoor exposure durability, preferred is a crosslinked silicone resin among them.

As the silicone resin, any suitable silicone resin is acceptable as long as the effects of the present invention are not impaired. Just one type of silicone resin may be used, or two or more types of silicone resin may be used. Such a silicone resin may be a condensed silicone resin or an addition-type silicone resin. In addition, such a silicone resin may be a one-component silicone resin to be dried alone (e.g., a one-component room-temperature vulcanizing (RTV) resin) or a two-component silicone resin (e.g., a two-component room-temperature vulcanizing (RTV) resin).

Examples of the silicone resin that can be used include: one-component RTV rubber, manufactured by Shin-Etsu Chemical Co., Ltd., (e.g., KE-3423, KE-347, KE-3475, KE-3495, KE-4895, KE-4896, KE-1830, KE-1884, KE-3479, KE-348, KE-4897, KE-4898, KE-1820, KE-1825, KE-1831, KE-1833, KE-1885, KE-1056, KE-1151, KE-1842, KE-1886, KE-3424G, KE-3494, KE-3490, KE-40RTV, KE-4890, KE-3497, KE-3498, KE-3493, KE-3466, KE-3467, KE-1862, KE-1867, KE-3491, KE-3492, KE-3417, KE-3418, KE-3427, KE-3428, KE-41, KE-42, KE-44, KE-45, KE-441, KE-445, KE-455); two-component RTV rubber, manufactured by Shin-Etsu Chemical Co., Ltd., (e.g., KE-1800T-A/B, KE-66, KE-1031-A/B, KE-200, KE-118, KE-103, KE-108, KE-119, KE-109E-A/B, KE-1051J-A/B, KE-1012-A/B, KE-106, KE-1282-A/B, KE-1283-A/B, KE-1800-A/B/C, KE-1801-A/B/C, KE-1802-A/B/C, KE-1281-A/B, KE-1204-A/B, KE-1204-AL/BL, KE-1280-A/B, KE-513-A/B, KE-521-A/B, KE-1285-A/B, KE-1861-A/B, KE-12, KE-14, KE-17, KE-113, KE-24, KE-26, KE-1414, KE-1415, KE-1416, KE-1417, KE-1300T, KE-1310ST, KE-1314-2, KE-1316, KE-1600, KE-1603-A/B, KE-1606, KE-1222-A/B, KE-1241); a silicone sealant, manufactured by Shin-Etsu Chemical Co., Ltd., (e.g., KE-42AS, KE-420, KE-450); a rubber compound, manufactured by Shin-Etsu Chemical Co., Ltd., (e.g., KE-655-U, KE-675-U, KE-931-U, KE-941-U, KE-951-U, KE-961-U, KE-971-U, KE-981-U, KE-961T-U, KE-971T-U, KE-871C-U, KE-9410-U, KE-9510−U, KE-9610-U, KE-9710-U, KE-742-U, KE-752-U, KE-762-U, KE-772-U, KE-782-U, KE-850-U, KE-870-U, KE-880-U, KE-890-U, KE-9590-U, KE-5590-U, KE-552-U, KE-582-U, KE-552B-U, KE-555-U, KE-575-U, KE-541-U, KE-551-U, KE-561-U, KE-571-U, KE-581-U, KE-520-U, KE-530B-2-U, KE-540B-2-U, KE-1551-U, KE-1571-U, KE-152-U, KE-174-U, KE-3601SB-U, KE-3711-U, KE-3801M-U, KE-5612G-U, KE-5620BL-U, KE-5620 W-U, KE-5634-U, KE-7511-U, KE-7611-U, KE-765-U, KE-785-U, KE-7008-U, KE-7005-U, KE-503-U, KE-5042-U, KE-505-U, KE-6801-U, KE-136Y-U); LIMS (liquid silicone rubber injection molding system), manufactured by Shin-Etsu Chemical Co., Ltd., (e.g., KEG-2000-40A/B, KEG-2000−50A/B, KEG-2000−60A/B, KEG-2000-70A/B, KEG-2001-40A/B, KEG-2001-50A/B, KE-1950-10A/B, KE-1950-20A/B, KE-1950-30A/B, KE-1950-35A/B, KE-1950-40A/B, KE-1950−50A/B, KE-1950-60A/B, KE-1950-70A/B, KE-1935A/B, KE-1987A/B, KE-1988A/B, KE-2019-40A/B, KE-2019-50A/B, KE-2019-60A/B, KE-2017-30A/B, KE-2017-40A/B, KE-2017-50A/B, KE-2090-40A/B, KE-2090-50A/B, KE-2090-60A/B, KE-2090-70A/B, KE-2096-40A/B, KE-2096-50A/B, KE-2096−60A/B); a LR7665 series, manufactured by Wacker Asahikasei Silicone Co., Ltd.; a LR3033 series, manufactured by Wacker Asahikasei Silicone Co., Ltd.; a TSE3032 series and others, manufactured by Momentive Performance Materials Inc.; or Sylgard 184 and others, manufactured by Dow Corning Toray Co., Ltd.

<Oil Component>

The oil-containing resin layer11may contain, for instance, two oil components, namely a first oil component and a second oil component.

Examples of the first oil component that can be used include silicone oil, fluorine oil, hydrocarbon-based oil, polyether-based oil, ester-based oil, phosphorus compound-based oil, or mineral oil-based oil.

Examples of the silicone oil that can be used include: silicone oil, manufactured by Shin-Etsu Chemical Co., Ltd., (e.g., KF96L series, KF96 series, KF69 series, KF99 series, KF50 series, KF54 series, KF410 series, KF412 series, KF414 series, FL series, KF-6000, KF-6001, KF-6002, KF-6003); silicone oil, manufactured by Momentive Performance Materials Inc., (e.g., Element14*PDMS series, TSF404 series, TSF410 series, TSF4300 series, TSF431 series, TSF433 series, TSF437 series, TSF4420 series, TSF4421 series); silicone oil, manufactured by Dow Corning Toray Co., Ltd., (e.g., BY16-846 series, SF8416 series, SF8427 series, SF-8428 series, SH200 series, SH203 series, SH230 series, SF8419 series, FS1265 series, SH510 series, SH550 series, SH710 series, FZ-2110 series, FZ-2203 series, BY16-201); or silicone oil, manufactured by Wacker Asahikasei Silicone Co., Ltd., (e.g., WACKER (registered trademark) SILICONE FLUID AK series, WACKER (registered trademark) SILICONE FLUID AP series, WACKER (registered trademark) SILICONE FLUID AR series, WACKER (registered trademark) SILICONE FLUID AS series, WACKER (registered trademark) TN series, WACKER (registered trademark) L series, WACKER (registered trademark) AF series).

Meanwhile, examples of the second oil component that can be used include silicone oil, fluorine oil, hydrocarbon-based oil, polyether-based oil, ester-based oil, phosphorus compound-based oil, or mineral oil-based oil.

Examples of the silicone oil that can be used include: silicone oil, manufactured by Shin-Etsu Chemical Co., Ltd., (e.g., KF96L series, KF96 series, KF69 series, KF99 series, KF50 series, KF54 series, KF410 series, KF412 series, KF414 series, FL series, KF-6000, KF-6001, KF-6002, KF-6003); silicone oil, manufactured by Momentive Performance Materials Inc., (e.g., Element14*PDMS series, TSF404 series, TSF410 series, TSF4300 series, TSF431 series, TSF433 series, TSF437 series, TSF4420 series, TSF4421 series); silicone oil, manufactured by Dow Corning Toray Co., Ltd., (e.g., BY16-846 series, SF8416 series, SF8427 series, SF-8428 series, SH200 series, SH203 series, SH230 series, SF8419 series, FS1265 series, SH510 series, SH550 series, SH710 series, FZ-2110 series, FZ-2203 series, BY16-201); or silicone oil, manufactured by Wacker Asahikasei Silicone Co., Ltd., (e.g., WACKER (registered trademark) SILICONE FLUID AK series, WACKER (registered trademark) SILICONE FLUID AP series, WACKER (registered trademark) SILICONE FLUID AR series, WACKER (registered trademark) SILICONE FLUID AS series, WACKER (registered trademark) TN series, WACKER (registered trademark) L series, WACKER (registered trademark) AF series).

A combination of the first oil component, the second oil component, and the resin component in the oil-containing resin layer11is selected to satisfy, for instance, the following characteristics 1) and 2).

1) The first oil component and the second oil component are not phase-separated and compatible at a temperature at which the second oil component is not required to bleed into the surface resin layer12, for example, at an ordinary temperature of about 20° C. to 80° C. which is significantly higher than a predetermined value such as the freezing point; and they are phase-separated under an environment at a temperature at which the second oil component is required to bleed into the surface resin layer12, for example, at a predetermined temperature (e.g., the freezing point) or lower.

2) The first oil component is miscible with the resin component of the oil-containing resin layer11both at a temperature at which the second oil component is not required to bleed into the surface resin layer12and at a temperature at which the second oil component is required to bleed into the surface resin layer12; and by contrast, the second oil component changes behavior in the presence of the first oil component, depending on the temperature at which the second oil component is not required to bleed into the surface resin layer12or the temperature at which the second oil component is required to bleed into the surface resin layer12.

More specifically, without the first oil component, the second oil component is immiscible with the resin component of the oil-containing resin layer11both at a temperature at which the second oil component is not required to bleed into the surface resin layer12and at a temperature at which the second oil component is required to bleed into the surface resin layer12. In other words, the second oil component exudes from the resin component of the oil-containing resin layer11. Meanwhile, in the presence of the first oil component, the second oil component is compatible with the first oil component at a temperature at which the second oil component is not required to bleed into the surface resin layer12. Thus, the second oil component is miscible with the resin component in the oil-containing resin layer11. In other words, the second oil component does not exude therefrom. By contrast, the second oil component is immiscible with the resin component of the oil-containing resin layer11because phase-separated from the first oil component at a temperature at which the second oil component is required to bleed into the surface resin layer12. In other words, the second oil component functions as a low-temperature phase-separable oil component that can be phase-separated from the first oil component.

The solubility parameter value is empirically known to be an indicator to determine how easily a solvent and a solute are mixed. The relationship among the first oil component, the second oil component, and the resin component of the oil-containing resin layer11as described above can also be explained based on the relationship among each solubility parameter value (SP value). As used herein, a Hansen solubility parameter as the solubility parameter. This value can be determined by subjecting the first oil component, the second oil component, and the resin component of the oil-containing resin layer11to Fourier transform nuclear magnetic resonance spectrometry, examining the type of molecular unit constituting the molecular structure of each component and their molar ratio, and calculating a Hansen solubility parameter for each molecular unit type as weight-averaged using the molar ratio. The Hansen solubility parameter for each molecular unit type can be determined by the molecular group contribution method using software “HSPiP, Hansen Solubility Parameters in Practice ver4” available in the link (https://hansen-solubility.com/). Specifically, each constituent unit in a substance of interest is input using the SMILES notation, and the HSP values (δd, δp, δh) for each unit can be calculated.

To keep the relationship between the above characteristics 1) and 2), the difference between the solubility parameter value for the resin component in the oil-containing resin layer11and the solubility parameter value for the first oil component is preferably set to be at least smaller than the difference between the solubility parameter value for the resin component in the oil-containing resin layer11and the solubility parameter value for the second oil component. In addition, to keep the relationship between the above characteristics 1) and 2), the oil-containing resin layer11contains, for instance, the resin component in a proportion of at least 25 wt % or more, the first oil component in a proportion of at least 5 wt % or more, and the second oil component in a proportion of at least 3 wt % or more based on the total weight of the oil-containing resin layer, under an environment at a temperature at which the first oil component and the second oil component are not phase-separated. Further, the difference in solubility parameter between the first oil component and the resin component of the oil-containing resin layer11is preferably set to be within 0.6 (J/cm3)1/2.

More specifically, the weight of the resin component in the oil-containing resin layer11based on the total weight of the finally formed oil-containing resin layer is preferably 30 wt % or higher, more preferably 35 wt % or higher, and still more preferably 40 wt % or higher. The upper limit is not particularly limited and set, if appropriate, in view of the oil component, and may be, for instance, 70 wt % or lower.

In addition, the weight of the first oil component based on the total weight of the finally formed oil-containing resin layer may be set to be, for instance, 10 wt % or higher, 15 wt % or higher, or 20 wt % or higher. The upper limit is not particularly limited and may be set to be preferably 65 wt % or lower, such as 50 wt % or lower, 40 wt % or lower, 30 wt % or lower, or 20 wt % or lower.

In addition, the weight of the second oil component based on the total weight of the finally formed oil-containing resin layer is preferably 5 wt % or higher, more preferably 10 wt % or higher, and still more preferably 15 wt % or higher. The upper limit is not particularly limited and may be set to be preferably 62 wt % or lower, such as 60 wt % or lower, 50 wt % or lower, 40 wt % or lower, or 30 wt % or lower.

If the relationship between above 1) and 2) is met, for instance, the second oil component is compatible with the first oil component at a temperature at which the second oil component is not required to bleed into the surface resin layer12, so that the second oil component does not bleed from the surface of the oil-containing resin layer11. By contrast, if the temperature is changed to a temperature at which the second oil component is required to bleed into the surface resin layer12, the second oil component is phase-separated from the first oil component and then exudes from a surface of the oil-containing resin layer11on the side of the surface resin layer12, and can thus function as a low-temperature exuding oil component that can be bled from the surface resin layer12.

As clear from the above description, the first oil component and the second oil component do not have to be distinguishable as a substance and suffice if they can be distinguished from each other from the aspects of the above described functions and actions. Hence, the first oil component and the second oil component do not have to be each included as one oil component. If the above relationship is met, each of the first and second oil components may contain a plurality of oil components.

(2) Surface Resin Layer

The surface resin layer12aims at protecting the surface of the oil-containing resin layer11, is a solid resin layer provided while layered on one of surfaces of the oil-containing resin layer11, and contains at least a resin component. The surface resin layer12further may contain an oil component, like the oil-containing resin layer.

The layer thickness of the surface resin layer12is not particularly limited, and, in order to make the oil permeate easily to the surface of the surface resin layer12, in other words, in order to secure oil permeability of the surface resin layer12, is preferably 750 μm or less and, from the viewpoint of strength, preferably 50 μm or more.

<Resin Component in Surface Resin Layer>

In order to protect the surface of the oil-containing resin layer11, the surface resin layer12preferably has higher wear resistance than the oil-containing resin layer11.

Although covering the oil-containing resin layer11, the surface resin layer12is required to have enough oil permeability to permeate the second oil component exuding from the oil-containing resin layer11to a surface of the surface resin layer12that is opposite to a side of the oil-containing resin layer11so as not to hinder the function of preventing icing and/or snow accretion through the oil stored in the oil-containing resin layer.

Examples of material for the resin component in the surface resin layer12that satisfies the above requirements include, but are not particularly limited to, silicone resin, polyurethane resin, polyurethane acrylic resin, vinyl chloride resin, polyester resin, elastomers, fluororesin, polyamide resin, polyolefin resin (e.g., polyethylene, polypropylene), or acrylic resin. From the viewpoint of an oil component bleeding effect and excellent outdoor exposure durability, a crosslinked silicone resin is preferred among them.

As the silicone resin, any suitable silicone resin is acceptable as long as the effects of the present invention are not impaired. Just one type silicone resin may be used, or two or more types of silicone resin may be used. Such a silicone resin may be a condensed silicone resin or an addition-type silicone resin. In addition, such a silicone resin may be a one-component silicone resin to be dried alone (e.g., a one-component room-temperature vulcanizing (RTV) resin) or a two-component silicone resin (e.g., a two-component room-temperature vulcanizing (RTV) resin).

Examples of the silicone resin that can be used include: one-component RTV rubber, manufactured by Shin-Etsu Chemical Co., Ltd., (e.g., KE-3423, KE-347, KE-3475, KE-3495, KE-4895, KE-4896, KE-1830, KE-1884, KE-3479, KE-348, KE-4897, KE-4898, KE-1820, KE-1825, KE-1831, KE-1833, KE-1885, KE-1056, KE-1151, KE-1842, KE-1886, KE-3424G, KE-3494, KE-3490, KE-40RTV, KE-4890, KE-3497, KE-3498, KE-3493, KE-3466, KE-3467, KE-1862, KE-1867, KE-3491, KE-3492, KE-3417, KE-3418, KE-3427, KE-3428, KE-41, KE-42, KE-44, KE-45, KE-441, KE-445, KE-455); two-component RTV rubber, manufactured by Shin-Etsu Chemical Co., Ltd., (e.g., KE-1800T-A/B, KE-66, KE-1031-A/B, KE-200, KE-118, KE-103, KE-108, KE-119, KE-109E-A/B, KE-1051J-A/B, KE-1012-A/B, KE-106, KE-1282-A/B, KE-1283-A/B, KE-1800-A/B/C, KE-1801-A/B/C, KE-1802-A/B/C, KE-1281-A/B, KE-1204-A/B, KE-1204-AL/BL, KE-1280-A/B, KE-513-A/B, KE-521-A/B, KE-1285-A/B, KE-1861-A/B, KE-12, KE-14, KE-17, KE-113, KE-24, KE-26, KE-1414, KE-1415, KE-1416, KE-1417, KE-1300T, KE-1310ST, KE-1314-2, KE-1316, KE-1600, KE-1603-A/B, KE-1606, KE-1222-A/B, KE-1241); a silicone sealant, manufactured by Shin-Etsu Chemical Co., Ltd., (e.g., KE-42AS, KE-420, KE-450); a rubber compound, manufactured by Shin-Etsu Chemical Co., Ltd., (e.g., KE-655-U, KE-675-U, KE-931-U, KE-941-U, KE-951-U, KE-961-U, KE-971-U, KE-981-U, KE-961T-U, KE-971T-U, KE-871C-U, KE-9410-U, KE-9510−U, KE-9610-U, KE-9710-U, KE-742-U, KE-752-U, KE-762-U, KE-772-U, KE-782-U, KE-850-U, KE-870-U, KE-880-U, KE-890-U, KE-9590-U, KE-5590-U, KE-552-U, KE-582-U, KE-552B-U, KE-555-U, KE-575-U, KE-541-U, KE-551-U, KE-561-U, KE-571-U, KE-581-U, KE-520-U, KE-530B-2-U, KE-540B-2-U, KE-1551-U, KE-1571-U, KE-152-U, KE-174-U, KE-3601SB-U, KE-3711-U, KE-3801M-U, KE-5612G-U, KE-5620BL-U, KE-5620 W-U, KE-5634-U, KE-7511-U, KE-7611-U, KE-765-U, KE-785-U, KE-7008-U, KE-7005-U, KE-503-U, KE-5042-U, KE-505-U, KE-6801-U, KE-136 Y-U); LIMS (liquid silicone rubber injection molding system), manufactured by Shin-Etsu Chemical Co., Ltd., (e.g., KEG-2000-40A/B, KEG-2000-50A/B, KEG-2000-60A/B, KEG-2000-70A/B, KEG-2001-40A/B, KEG-2001-50A/B, KE-1950-10A/B, KE-1950-20A/B, KE-1950-30A/B, KE-1950-35A/B, KE-1950-40A/B, KE-1950-50A/B, KE-1950-60A/B, KE-1950-70A/B, KE-1935A/B, KE-1987A/B, KE-1988A/B, KE-2019-40A/B, KE-2019-50A/B, KE-2019-60A/B, KE-2017-30A/B, KE-2017-40A/B, KE-2017-50A/B, KE-2090-40A/B, KE-2090-50A/B, KE-2090-60A/B, KE-2090-70A/B, KE-2096-40A/B, KE-2096-50A/B, KE-2096-60A/B); a LR7665 series, manufactured by Wacker Asahikasei Silicone Co., Ltd.; a LR3033 series, manufactured by Wacker Asahikasei Silicone Co., Ltd.; a TSE3032 series and others, manufactured by Momentive Performance Materials Inc.; or Sylgard 184 and others, manufactured by Dow Corning Toray Co., Ltd.

Note that the material for the resin component in the surface resin layer12may be the same as that in the oil-containing resin layer11. In order to increase wear resistance, however, the proportion of the resin component included in the surface resin layer12is preferably set to be significantly larger than the proportion in the oil-containing resin layer11.

(3) Base Material

The base material13is used to secure the strength of the sheet body1by supporting, for instance, the oil-containing resin layer11and to make it easy to handle the sheet body1.

Examples of the base material13that can be used include, but are not particularly limited to, polyurethane resin, polyurethane acrylic resin, rubber-based resin, vinyl chloride resin, polyester resin, silicone resin, elastomers, fluororesin, polyamide resin, polyolefin resin (e.g., polyethylene, polypropylene), or a metal plate or metal foil (e.g., aluminum, copper, silver, iron, nickel, tin, stainless steel).

To prevent a discharge of the oil component from the oil-containing resin layer11, the base material13is preferably formed as an oil-impermeable resin layer that is impermeable to the oil. Examples of the oil-impermeable base material that can be used include, but are not particularly limited to, polyurethane resin, polyurethane acrylic resin, rubber-based resin, vinyl chloride resin, polyester resin, silicone resin, elastomers, fluororesin, polyamide resin, or polyolefin resin (e.g., polyethylene, polypropylene).

(4) Adhesive Layer

The adhesive layer14is used to adhere, for instance, the oil-containing resin layer11to a variety of objects to be attached.

Examples of the material for the adhesive layer14that can be used include, but are not particularly limited to, an acrylic resin-based adhesive, epoxy resin-based adhesive, amino resin-based adhesive, vinyl resin (e.g., vinyl acetate polymer)-based adhesive, curable acrylic resin-based adhesive, or silicone resin-based adhesive.

To prevent a discharge of the oil component from the oil-containing resin layer11, the adhesive layer14, instead of the oil-impermeable base material13or together with the oil-impermeable base material13, may be used to form an oil-impermeable resin layer that is impermeable to the oil. Examples of the material for the oil-impermeable adhesive material layer that can be used include, but are not particularly limited to, an acrylic resin-based adhesive, epoxy resin-based adhesive, amino resin-based adhesive, vinyl resin (e.g., vinyl acetate polymer)-based adhesive, curable acrylic resin-based adhesive, or silicone resin-based adhesive.

If the adhesive layer is used to form the oil-impermeable resin layer, the base material13is not necessarily impermeable to the oil. Thus, if no problem of, for instance, strength occurs, the base material13may be omitted as shown inFIG.2. In this case, the adhesive layer14is provided on the other surface opposite to the one surface of the oil-containing resin layer11.

In addition, instead of the base material13and the adhesive material layer14as shown inFIG.3or together with them as shown inFIG.4, an oil-impermeable resin layer16that is impermeable to the oil may be further provided between the oil-containing resin layer11and the base material13. Although not depicted, an oil-impermeable resin layer16may be arranged between the base material13and the adhesive14inFIG.4. The material for the oil-impermeable resin layer16is not particularly limited, and substantially the same material for the oil-impermeable base material13may be used.

Note that the adhesive layer14is provided to adhere, for instance, the oil-containing resin layer11to a variety of objects to be attached. Thus, an adhesive tape, for instance, may be, of course, used instead of the adhesive layer14.

(5) Separator

The separator15may be suitably selected in accordance with, for instance, the material for the adhesive layer14. Examples of the separator15that can be used include, but are not particularly limited to, polyurethane resin, polyurethane acrylic resin, rubber-based resin, vinyl chloride resin, polyester resin, silicone resin, elastomers, fluororesin, polyamide resin, or polyolefin resin (e.g., polyethylene, polypropylene).

(6) Production of Sheet Body

A layered body including the oil-containing resin layer11and the surface resin layer12may be manufactured, without limitation, by producing the oil-containing resin layer11using, for instance, a resin component and an oil component and then producing, on this oil-containing resin layer11, the surface resin layer12using a resin component and an oil component.

Next, the layered body including the oil-containing resin layer11and the surface resin layer12is provided with the base material13, the adhesive layer14, and the separator14, using a conventionally known step(s). The base material13is bonded, using, for instance, an adhesive, to a surface of the oil-containing resin layer11that is opposite to a side of the surface resin layer12. The adhesive layer14is attached to a surface of the base material13that is opposite to a side of the oil-containing resin layer11. After that, the separator14is attached to the outside surface of the adhesive layer14in a detachable state.

2. EXAMPLES

Hereinbelow, the present invention will be described in more detail with reference to Examples. However, the present invention is not limited to the following Examples.

Example 1

Each sheet body was obtained by the following procedure.

1) Production of Oil-Containing Resin Layer

First, a Sylgard 184 main agent (manufactured by Dow Corning Toray Co., Ltd.) as a resin component, a Sylgard 184 curing agent (manufactured by Dow Corning Toray Co., Ltd.) also as a resin component, dimethyl siloxane oil (product #KF-96 100 cs, manufactured by Shin-Etsu Chemical Co., Ltd. Silicone Division) as the first oil component, and methylphenyl siloxane oil (TSF437 manufactured by Momentive Performance Materials Inc.) as the second oil component were mixed at a ratio (weight ratio) of 100:10:210:90. Next, the mixture was poured into a mold and was cured at 100° C. for 30 min in an oven to prepare an oil-containing resin layer primarily having dimethyl polysiloxane rubber containing dimethyl siloxane oil and methylphenyl siloxane oil. The thickness of the oil-containing resin layer was 1000 μm. Here, the solubility parameter value for dimethyl siloxane oil is 11.7 (J/cm3)1/2, the solubility parameter value for methylphenyl siloxane oil is 13.9 (J/cm3)1/2, and, further, the solubility parameter value for dimethyl polysiloxane rubber as the resin component of the oil-containing resin layer is 11.9 (J/cm3)1/2.

2) Production of Surface Resin Layer

Like in the oil-containing resin layer, a Sylgard 184 main agent (manufactured by Dow Corning Toray Co., Ltd.) as a resin component, a Sylgard 184 curing agent (manufactured by Dow Corning Toray Co., Ltd.) also as a resin component, dimethyl siloxane oil (product #KF-96 100 cs, manufactured by Shin-Etsu Chemical Co., Ltd. Silicone Division) as the first oil component, and methylphenyl siloxane oil (TSF437 manufactured by Momentive Performance Materials Inc.) as the second oil component were mixed at a ratio (weight ratio) of 100:10:35:15. Next, the resulting mixture was poured onto the oil-containing resin layer in the mold produced in the above 1), and was then cured at 100° C. for 3 h in an oven to form a surface resin layer. The thickness of the surface resin layer was 50 μm.

3) Base Material

A PET film Lumirror S10 #125 (manufactured by Toray Industries, Inc.) was provided, as a base material, on a surface that was of the oil-containing resin layer and was opposite to the side of the surface resin layer. The base material and the oil-containing resin layer were bonded by curing the oil-containing resin layer on the base material. Thus, a bonding step is unnecessary.

4) Other Matters

Neither an adhesive nor a separator was provided. However, because the base material was impermeable to the oil, the oil component should not leak, so that the evaluation of the below-described items should not be affected.

5) Evaluation

The evaluation items were as follows.

<Oil Content>

The oil content in each of the oil-containing resin layer and the surface resin layer was calculated by the formula below. A sample of each of the oil-containing resin layer and the surface resin layer was obtained by scraping off either one layer from the layered body.

Oil Content=W1/W0,

wherein W0 is a weight (g) of the oil-containing resin layer or the surface resin layer under an environment at 20° C., obtained by immersing either the oil-containing resin layer or the surface resin layer into toluene (FUJIFILM Wako Pure Chemical Corporation) at 20° C. for 24 h and then by drying at 100° C. for 2 h; and W1 is a weight (g) of the oil-containing resin layer or the surface resin layer under an environment at 20° C., obtained by immersing the above post-drying material into dimethyl silicone oil (trade name “KF-96 100 cs”) at 20° C. for 100 h and then by wiping the oil on the surface of each material.

To prevent the second oil component from excessively exuding from the oil-containing resin layer or from excessively bleeding from the surface resin layer, the oil content in the oil-containing resin layer is preferably 2.5 or less. By contrast, to make the second oil component sufficiently exude or bleed, the oil content is preferably 1.5 or higher.

Meanwhile, from the viewpoint of wear resistance, the oil content in the surface resin layer is preferably 2.3 or less. By contrast, to make the second oil component sufficiently bleed, the oil content is preferably 1.2 or higher.

<Layer Thickness and Layer Thickness Ratio>

The layer thickness of each of the oil-containing resin layer and the surface resin layer was measured using a film thickness meter MFC-101 (manufactured by Nikon Corporation).

In addition, the layer thickness ratio was determined by using each layer thickness calculated by the above procedure, based on the following formula.
Layer thickness ratio=Thickness of Surface resin layer/Thickness of Oil-containing resin layer

To make the oil component of the oil-containing resin layer sufficiently bleed from the surface resin layer, the layer thickness ratio is preferably 0.75 or lower and more preferably 0.5 or lower. In addition, from the viewpoint of strength, the ratio is preferably 0.05 or higher and more preferably 0.1 or higher. As a result, from the viewpoint of the bleeding oil level and the strength, the film thickness ratio is preferably from 0.05 to 0.75 and more preferably from 0.1 to 0.5.

<Phase Separation and Compatibility, Etc.>

Evaluated were a) phase separation and compatibility between the “first oil component” and the “second oil component” in response to a temperature change; b) miscibility between the “first oil component” and the “resin component in the oil-containing resin layer” in response to a temperature change; and c) miscibility between the “second oil component” and the “resin component in the oil-containing resin layer” in response to a temperature change. It should be noted that a direct analyte was a mixture of the “first oil component” and the “second oil component” extracted from the oil-containing resin layer and the oil component exuding from the surface of the oil-containing resin layer. The oil-containing resin layer was obtained by scraping off the surface resin layer from the layered body having the oil-containing resin layer and the surface resin layer.

To evaluate the above a), the oil-containing resin layer was first immersed into toluene (manufactured by FUJIFILM Wako Pure Chemical Corporation) at 20° C. for 24 h to extract the first oil component and the second oil component as a mixture. The first oil component or the second oil component in the mixture was separated by liquid-phase chromatography. For the extracted first oil component/second oil component mixture, the “transmittance at 20° C. and 500 nm” and the “transmittance at 3° C. and 500 nm” were each measured. Based on the proportion of the difference between the two transmittance values to the “transmittance at 20° C. and 500 nm,” whether they were “phase-separated (incompatible)” or “compatible (not phase-separated)” was determined. More specifically, if the difference was 10% or higher, they were evaluated to be “phase-separated (incompatible) in response to a temperature change”; and if the difference was less than 10%, they were evaluated to be “compatible (not phase-separated) in response to a temperature change.” The transmittance was measured using a UV/visible spectrophotometer (V-750, manufactured by JASCO Corporation) set at a measurement wavelength of 500 nm, a scanning speed of 1000 nm/min, and a mixing rate of 400 rpm. The sample was set to 20° C. or 3° C., allowed to stand for 10 min, and then measured. The reference used was the air.

The criteria were as follows.

◯ . . . 10% or higher

x . . . less than 10%

With regard to the above b) and c), the oil component-containing resin layer containing only one of each oil component in the oil component-extracted oil-containing resin layer was placed under an environment at 20° C. or under an environment at 3° C. Each case was evaluated by determining whether or not the first oil component or the second oil component exuded from the surface of the oil-containing resin layer.

The criteria were as follows.◯ . . . exuding at any of 20° C. or 3° C.x . . . no exuding at any of 20° C. or 3° C.
<Surface Oil Level>

The measurement subject was the level of oil bleeding onto the surface of the surface resin layer at 20° C., the freezing point 0° C., or −20° C. When measured, the exuding oil was confirmed to be primarily the second oil component.FIG.5is an example of light microscope image obtained by photographing a state of oil bleeding on a surface of a surface resin layer. This figure shows a surface oil state when the below-described sheet of Example 7 was cooled using a Peltier element at −20° C. for 1 h under nitrogen purge.

The surface oil level was measured by the following method.

An oil-containing resin layer was cut, at or near the center region of each sheet body, into 10 cm×2 cm size pieces, and the pieces were left for 16 h at a temperature of each of 20° C., 0° C., or −20° C. At this time, the oil bleeding on the surface of the surface resin layer was collected with a cell scraper (CSS-10, manufactured by KENIS, Ltd.) under an environment at a temperature of each of 20° C., 0° C., or −20° C. The oil was absorbed until no change in the weight of oil absorbing paper (oil absorbing level) was observed. The oil collection using the cell scraper and absorption into the oil absorbing paper were repeated 7 times per min. The difference in weight of the oil absorbing paper between before and after the oil absorption was defined as the surface oil level. The test was triplicate, and the average value was calculated.

The criteria were as follows.◯ . . . from 40 μg/cm2to less than 300 μg/cm2x . . . less than 40 μg/cm2

To prevent useless bleeding, the surface oil level is preferably less than 40 μg/cm2at 20° C. To prevent ice/snow accretion, the surface oil level is preferably 40 μg/cm2or higher and more preferably 300 μg/cm2or higher at each of 0° C. or −20° C. In this regard, however, even if the level is 40 μg/cm2or higher at 20° C. or even if the level is 40 μg/cm2or lower at 0° C. or −20° C., such values may be acceptable for use.

<Wear Resistance>

The wear resistance of each surface resin layer was evaluated.

The measurement device used was a fastness rubbing tester (Model: RT-300S; DAIEI KAGAKU SEIKI MFG. Co., Ltd.).FIG.6shows a schematic view of the tester. A tester2includes: a test table21; a support plate22fixed to the test table21using screws22a, etc.; and a friction block25(with a size of 2 cm×2 cm) disposed above the support body22and arranged below a cantilevered load arm24onto which a load is applied by a weight23. Using this tester2, a reduction rate of each surface resin layer was determined as follows: a test piece32of the surface resin layer was attached via an adhesive material31(No. 5000NS, manufactured by NITTO DENKO CORPORATION) onto the support plate22, in particular, a 20 mm×120 mm area thereof; and a #120-mesh water resistant polishing tool34attached via the above adhesive31to the underside of the friction block25was reciprocated 100 times at a speed of 100 mm/s under pressure applied at 125 g/cm2, which was adjusted by the weight23and the load arm24. The room temperature was set to 20° C.

The criteria were as follows.⊚ . . . less than 10%◯ . . . from 10% to less than 80%x . . . 80% or higher

To endure outdoor use, the wear resistance is preferably less than 80%, more preferably less than 50%, and still more preferably less than 20%. In this regard, however, the case of even 80% or higher may be acceptable for use.

<Ice Adhesion Strength>

The measurement subject was force required to move an ice mass attached to the surface resin layer under an environment at −20° C. For convenience, the magnitude of this force was herein defined as “ice adhesion strength.”

The ice adhesion strength was measured by the following method.1. First, a cylindrical ice mass was prepared. The ice mass was prepared by placing a stainless ring (with an inner diameter of 25 mm) on the bottom of a styrene square type case no. 16 (manufactured by AS ONE Corporation), pouring 6 g of pure water into the ring, freezing it at −20° C. for 16 h or longer, and removing the stainless ring after the freezing.2. Next, a film allowed to stand under an environment at −20° C. for 16 h was attached to a stainless plate provided in parallel to the floor such that the surface resin layer is a superficial layer. Then, the above cylindrical ice mass with an attachment area of 4.9 cm2was attached.3. The environment temperature was set to −20° C. At 3 h after the cylindrical ice mass was attached, the ice mass was pushed at a rate of 0.1 mm/s using a load cell (DPU-50, manufactured by IMADA Co., Ltd.; an attachment jig A-type A-4) in a direction parallel to the floor under an environment at −20° C. The load applied during 40 s was measured with a force gage (ZTS-50N, manufactured by IMADA Co., Ltd.), and then the maximum load measured was divided by the attachment area 4.9 cm2to yield a value, which was recorded as the ice adhesion strength. The test was triplicated, and the average value was calculated.

Note that this measurement method was determined with reference to “Investigation on Technology of Preventing Icing (Part I), Reports of Hokkaido Industrial Research Institute No. 292 (1993).” The ice adhesion strength increases approximately proportionally as the surface oil level increases at least at a temperature of −20° C.

The criteria were as follows.⊚ . . . less than 0.1 N/cm2◯ . . . from 0.1 N/cm2to less than 1.0 N/cm2x . . . 1.0 N/cm2or higher

The smaller the ice adhesion strength value, the better. If less than 1.0 N/cm2, the value should be sufficient for practical use. In this regard, however, the value of even 1.0 N/cm2or higher may be acceptable for use.

<Water Resistance>

The water resistance of each oil-containing resin layer was evaluated as follows.

The test device used was a rain tester (manufactured by NISHIYAMA-SEISAKUSHO Co, Ltd.). A test piece of film (size: 150 mm×150 mm) was placed, and the film was subject to rainfall from the above of film in an amount corresponding to the annual precipitation. The annual precipitation was set to 1600 mm in view of the Meteorological Agency data. The test environment temperature was set to an ambient temperature of 5° C. in the tester, a precipitation temperature of 5° C., and a rainfall rate of about 500 mm/h while a rainy day in the winter was simulated.

The first oil component and the second oil component remaining in the test piece of film after the water resistance test were extracted. Then, a change in the ratio between the first oil component and the second oil component was used to calculate a reduction rate of the second oil component between before and after the water resistance test. Here, it has been confirmed that the first component oil does not decrease during the water resistance test.

The method of extracting the first oil and the second oil from the film and the method of calculating the second oil reduction rate are as follows.1. Each film is cut into a 20 mm×40 mm piece, which is placed in a screw bottle.2. About 30 g of chloroform is put into the screw bottle, which is then capped.3. A shaker (a double action lab shaker SRR-2; AS ONE Corporation) is used to shake the bottle at 100 rpm for 15 h. Then, the oil remaining in the film is extracted.4. A solid remaining in the screw bottle is removed.5. Chloroform containing the extracted oil is dried in a drier at 100° C. for 2 h to prepare a mixture of the first oil and the second oil.6. About 3 mg of the resulting mixture of the first oil and the second oil and about 700 mg of deuterated chloroform are collected into a vial to prepare a mixed solution.7. The mixed solution is transferred to an NMR sample tube.8. An NMR device (model; ULTRASHIELD 300, manufactured by BRUKER Inc.) is used to measure 1H NMR. Then, the results are assigned to each molecular structure of the second component oil.9. A change in the H count in Si—CH3between before and after UV irradiation is used to calculate the reduction rate of the second component oil due to the UV irradiation.

The criteria are as follows.1 . . . the second component oil reduction rate of less than 10%2 . . . the second component oil reduction rate of from 10 to less than 30%3 . . . the second component oil reduction rate of from 30 to less than 50%

Examples 2 to 4 and Reference Examples 1 to 3

Substantially the same procedure as in Example 1 was repeated except that the layer thickness (layer thickness ratio) of the surface resin layer was changed.

Example 5

Substantially the same procedure as in Example 1 was repeated except that the oil content in the surface resin layer was changed.

Examples 6, 7, and 9 to 11 and Reference Example 4

Substantially the same procedure as in Example 5 was repeated except that the layer thickness (layer thickness ratio) of the surface resin layer was changed.

Example 8

Substantially the same procedure as in Example 1 was repeated except that the sheet body was obtained by the following method.

1) To Produce Oil-Containing Resin Layer

First, a Sylgard 184 main agent (manufactured by Dow Corning Toray Co., Ltd.) as a resin component, a Sylgard 184 curing agent (manufactured by Dow Corning Toray Co., Ltd.) also as a resin component, dimethyl siloxane oil (product #KF-96 50 cs, manufactured by Shin-Etsu Chemical Co., Ltd. Silicone Division) as the first oil component, and carbinol-modified siloxane oil (KF-6001, manufactured by Shin-Etsu Chemical Co., Ltd. Silicone Division) as the second oil component were mixed at a ratio (weight ratio) of 100:10:255:45. Next, the mixture was poured into a mold and was cured at 100° C. for 30 min in an oven to prepare an oil-containing resin layer primarily having dimethyl polysiloxane rubber containing dimethyl siloxane oil and methylphenyl siloxane oil. The thickness of the oil-containing resin layer was 1000 μm. Here, the solubility parameter value for the carbinol-modified siloxane oil was 12.2.

2) Production of Surface Resin Layer

Like in the oil-containing resin layer, a Sylgard 184 main agent (manufactured by Dow Corning Toray Co., Ltd.) as a resin component, a Sylgard 184 curing agent (manufactured by Dow Corning Toray Co., Ltd.) also as a resin component, dimethyl siloxane oil (product #KF-96 50 cs, manufactured by Shin-Etsu Chemical Co., Ltd. Silicone Division) as the first oil component, and carbinol-modified siloxane oil (KF-6001, manufactured by Shin-Etsu Chemical Co., Ltd. Silicone Division) as the second oil component were mixed at a ratio (weight ratio) of 100:10:35:15. Next, the resulting mixture was poured onto the oil-containing resin layer in the mold produced in the above 1), and was then further cured at 100° C. for 3 h in an oven to form a surface resin layer. The surface resin layer had a thickness of 200 μm.

Example 12

1) Production of Oil-Containing Resin Layer

KE1935A/B (manufactured by Shin-Etsu Chemical Co., Ltd.) as a resin component, dimethyl siloxane oil (product #KF-96 50 cs, manufactured by Shin-Etsu Chemical Co., Ltd. Silicone Division) as the first oil component, and carbinol-modified oil (BY 16-201, manufactured by Dow Corning Toray Co., Ltd.) as the second oil component were mixed at a ratio (weight ratio) of 40:48:12. Next, the mixture was applied using an applicator onto a PET film (Lumirror S10 #75, manufactured by Toray Industries, Inc.), and was cured by heating under an environment at 150° C. for 3 min to form an oil-containing resin layer with a thickness of about 150 μm.

2) Production of Surface Resin Layer

Like in the oil-containing resin layer, KE1935A/B (manufactured by Shin-Etsu Chemical Co., Ltd.) as a resin component, dimethyl siloxane oil (product #KF-96 50 cs, manufactured by Shin-Etsu Chemical Co., Ltd. Silicone Division) as the first oil component, and carbinol-modified oil (BY 16-201, manufactured by Dow Corning Toray Co., Ltd.) as the second oil component were mixed at a ratio (weight ratio) of 66:27:7. Next, the resulting mixture was applied using an applicator onto the oil-containing resin layer produced in the above 1), and was then cured at 150° C. for 3 min in an oven to form a surface resin layer. The thickness of the surface resin layer was 50 μm.

Comparative Example 1

Substantially the same procedure as in Example 1 was repeated except that no surface resin layer was provided.

The Table below shows the evaluation results.

Note that with respect to the evaluations of “Phase Separation and Compatibility, etc. (e.g., a change in transmittance)” in the Table, the “First Oil/Second Oil” represents the phase separation and compatibility between the “first oil component” and the “second oil component” corresponding to the above-described a); the “First Oil/Resin” represents the miscibility between the “first oil component” and the “resin component in the oil-containing resin layer” corresponding to the above-described b); and the “Second Oil/Resin” represents the miscibility between the “second oil component” and the “resin component in the oil-containing resin layer” corresponding to the above-described c). Each evaluation result is listed.

TABLE 1Surface resinOil-Phase Separation andlayercontainingCompatibility, etc.(Superficialresin layer(Change inLayer)(Lower Layer)Transmittance, etc.)SurfaceSurfaceSurface−20° C.LayerLayerLayerFirstOilOilOilWearIceOilThick-OilThick-Thick-Oil/FirstSecondLevelLevelLevelresist-adhesionWatercon-nesscon-nessnessSecondOil/Oil/20° C.0° C.−20° C.ancestrengthResist-tent(μm)tent(μm)RatioOilResinResin(μg/cm2)(μg/cm2)(μg/cm2)(%)(N/cm2)anceExample1.24502.3410000.05◯X◯X◯◯200⊚◯0.111Example1000.1◯X◯X◯◯200⊚◯0.212Example2000.2◯X◯X◯◯100⊚◯0.213Example3500.35◯X◯XX◯100⊚◯0.314Reference5000.5◯X◯XXX<40⊚X>11Example1Reference7500.75◯X◯XXX<40⊚X>11Example2Reference10001◯X◯XXX<40⊚X>11Example3Example1.5500.05◯X◯X◯◯200⊚◯0.115Example1000.1◯X◯X◯◯200⊚◯0.116Example2000.2◯X◯X◯◯200⊚◯0.117Example2000.2◯X◯X◯◯200⊚⊚<0.118Example3500.35◯X◯X◯◯200⊚◯0.119Example5000.5◯X◯X◯◯200⊚◯0.1110Example7500.75◯X◯XX◯100⊚◯0.2111ReferenceExample10001◯X◯XXX<40⊚X>114Compar-—0—◯X◯XXX<40X◯0.11ativeExample1Example1.5502.12500.2◯X◯XX⊚>300⊚⊚<0.1112

According to the present configuration, by providing a surface resin layer, wear resistance remarkably increased not only in the Examples but also in the Reference Examples.

With respect to the solubility parameter which is an indicator to determine how easily a solvent and a solute are mixed, in the Example 1 and others, the difference between the solubility parameter value for the resin component in the oil-containing resin layer and the solubility parameter value for the first oil component, that is, |11.9-11.7|=0.2 (J/cm3)1/2is smaller than the difference between the solubility parameter value for the resin component in the oil-containing resin layer and the solubility parameter value for the second oil component, that is, |11.9-13.9|=2.0 (J/cm3)1/2. In addition, the difference in solubility parameter between the first oil component and the resin component of the oil-containing resin layer11, that is, |11.7-11.9|=0.2 (J/cm3)1/2is set to be within 0.6 (J/cm3)1/2.

Further, even in Example 8, the difference between the solubility parameter value for the resin component in the oil-containing resin layer and the solubility parameter value for the first oil component, that is, |11.9-11.7|=0.2 (J/cm3)1/2is smaller than the difference between the solubility parameter value for the resin component in the oil-containing resin layer and the solubility parameter value for the second oil component, that is, |11.9-12.2|=0.3 (J/cm3)1/2. Furthermore, the difference in solubility parameter between the first oil component and the resin component of the oil-containing resin layer11, that is, |11.7-11.9|=0.2 (J/cm3)1/2is set to be within 0.6 (j/cm3)1/2.

With respect to the phase separation and the compatibility, the transmittance of the mixture of the first oil component and the second oil component was significantly changed when the temperature changed from 20° C. to 3° C. Thus, it is evident that the first oil component and the second oil component were phase-separated.

The first oil component did not substantially exude onto the surface of the oil-containing resin layer at a temperature of 20° C. or 3° C. Thus, it can be said that the first oil component was miscible with the resin component of the oil-containing resin layer. By contrast, the second oil component exuded from the surface of the oil-containing resin layer when the oil-containing resin layer was placed under an environment at 20° C. and did not substantially exude when placed under an environment at 3° C. This behavior corresponds to the phase separation between the first oil component and the second oil component. This result has revealed that the behavior of the second oil component was changed in response to a temperature change in the presence of the first oil component. Further, the second oil component is miscible with the resin component in the surface resin layer under an environment at 20° C., but is immiscible with the resin component in the surface resin layer under an environment at 3° C. This behavior is also clear from the results of the surface oil level.

In the Examples, the surface oil level and the ice adhesion strength were not each a significant value at ordinary temperature such as at 20° C. Once the temperature reached the predetermined value or lower, the surface oil level, for instance, at −20° C. was 40 μg/cm2or higher. As a result, the ice adhesion strength was less than 1.0. In addition, the oil component bled from the surface resin layer12is primarily the second oil component of the oil components included in the oil-containing resin layer. This configuration enables the prevention of conventional excessive bleeding of the oil component and thus the use of the second oil component to prevent, for instance, ice/snow accretion while preventing useless bleeding. Note that in the Examples and others, the first oil component and the second oil component were included not only in the oil-containing resin layer but also in the surface resin layer. The second oil component was recovered from the surface resin layer in an amount more than the amount of the second oil component included in the surface resin layer. Thus, it can be said that the second oil component included in the oil-containing resin layer exuded from the oil-containing resin layer and further bled from the surface resin layer. Here, also from this fact, it is evident that the surface resin layer12has enough oil permeability to permeate the second oil component exuding from the oil-containing resin layer to the surface of the surface resin layer.

As demonstrated in Example 8, in the case where carbinol-modified silicone oil was used as the second oil component, the ice adhesion strength, in particular, was decreased markedly. This may be because this case is speculated to have higher wettability to the oil-containing resin layer than the case of using phenyl-modified silicone oil as the second oil component.

Note that the temperature at which the second oil component is phase-separated from the first oil component, in other words, the temperature at which the second oil component bleeds from the surface resin layer can be adjusted by selecting the first oil component and the second oil component appropriately. Thus, the second oil component can function as a low-temperature exuding oil component at various temperatures such as at the freezing point or a temperature lower than the freezing point or even at a temperature higher than the freezing point.

The results of the water resistance in any of the Examples were favorable.

Hereinabove, the present invention can provide a sheet body having an improved function of preventing icing and/or snow accretion, and can also provide a sheet body having enough strength to endure, for instance, outdoor use.

It should be understood that the above description involves preferred embodiments and simply represents articles. It can be recognized that altered and modified distinct embodiments are readily made clear to those skilled in the art in light of the above teachings. Thus, exemplified embodiments and alternative embodiments can be implemented without departing from the spirit of articles set forth in the Claims attached.

REFERENCE SIGNS LIST

11Oil-containing resin layer12Surface resin layer13Base material14Adhesive layer15Separator16Oil-impermeable resin layer