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Patent US4948825 - Curable film forming compositions - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsThere are provided a pressure-sensitive adhesive and other compositions which free radical cured mixtures of at least one unsaturated elastomeric polymer and at least one organic additive which is substantially nonresponsive to action of free radicals and present in an amount sufficient to modify the...http://www.google.com/patents/US4948825?utm_source=gb-gplus-sharePatent US4948825 - Curable film forming compositionsAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS4948825 APublication typeGrantApplication numberUS 07/057,504Publication dateAug 14, 1990Filing dateJun 3, 1987Priority dateJun 3, 1987Fee statusPaidAlso published asCA1333829C, DE3856246D1, DE3856246T2, EP0316435A1, EP0316435A4, EP0316435B1, US5302649, US5614577, WO1988009800A1Publication number057504, 07057504, US 4948825 A, US 4948825A, US-A-4948825, US4948825 A, US4948825AInventorsYukihiko SasakiOriginal AssigneeAvery International CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (1), Referenced by (40), Classifications (26), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetCurable film forming compositions
US 4948825 AAbstract
1. A pressure-sensitive adhesive comprising a free radical cured mixture of at least one unsaturated elastomeric polymer present in a total amount of from about 10 to about 60 parts by weight of the mixture and at least one organic additive which is substantially nonresponsive to the action of free radicals, said organic additive selected from the group consisting of aromatic organic additives which are at least 50% saturated and aliphatic organic hydrocarbon additives in which at least 65% of the unsaturated groups of the hydrocarbon as formed are saturated, the total of organic additive being present in an amount of from about 90 to about 40 parts by weight of the mixture and an effective amount up to about10 parts by weight of the mixture of a polythiol cross linking agent, said cured pressure sensitive adhesive having a glass transition temperature at least 10° below use temperature and an elevated temperature shear higher than the elevated temperature shear prior to cure, said cured mixture when at a proportion of 40 parts by weight elastomeric polymer and 60 parts by weight organic additive and in the absence of the polythiol cross linking agent having relative incipient gel dosage at cure at an electron beam dosage of 200 KV of no more than about 1.65.
2. A pressure sensitive adhesive comprising a free radical cured mixture of at least one unsaturated elastomeric polymer said elastomeric polymer present in a total amount of from about 10 to about 60 parts by weight of the mixture and selected from the group consisting of styrene-butadiene block copolymers, styrene-butadiene-styrene block copolymers, styrene-isoprene block copolymers; styrene-isoprene block copolymers, and mixtures thereof and at least one tackifying organic additive which is substantially nonresponsive to the action of free radicals said tackifying organic additive being an aliphatic organic hydrocarbon in which at least 65% of the unsaturated groups of the hydrocarbon as formed are saturated, the total of organic additive being present in an amount of form bout 90 to about 40 parts by weight of the mixture and an effective amount up to about 10 parts by weight of the mixture of a polythiol cross linking agent, said cured pressured sensitive adhesive having a glass transition temperature at least 10° C. below use temperature and an elevated temperature shear higher than the elevated temperature shear prior to cure, said cured mixture when at a proportion of 40 parts by weight elastomeric polymer and 60 parts by weight tackifying additive and in the absence of the polythiol cross-linking agent having relative incipient gel dosage at cure at an electron beam dosage of 200 KV of no more than about 1.65.
3. A pressure-sensitive adhesive as claimed in claim 2 in which the tackifying additive is provided to tackify the pressure-sensitive adhesive and the tackifying organic additive is present in a concentration of from about 45 to about 85 percent by weight based on the total weight of elastomeric polymer and tackifying organic additive.
4. A pressure-sensitive adhesive as claimed in claim 1 in which the organic additive is present in a concentration of about 45 to about 85 percent by weight based on the weight of the elastomeric polymer and organic additive.
5. A pressure-sensitive adhesive as claimed in claim 1 in which the unsaturated elastomeric polymer is selected from the group consisting of styrene-butadiene block copolymers, natural rubber styrene-butadiene-styrene block copolymers, styrene-isoprene block copolymers, styrene-isoprene-styrene block copolymers, polybutadiene, polyisoprene and mixtures thereof.
6. A pressure-sensitive adhesive as claimed in claim 4 in which the unsaturated elastomeric polymer is selected from the group consisting of natural rubber styrene-butadiene block copolymers, styrene-butadiene-styrene block copolymers, styrene-isoprene block copolymers, styrene-isoprene-styrene block copolymers, polybutadiene, polyisoprene and mixtures thereof.
7. A pressure-sensitive adhesive as claimed in claim 1 in which the unsaturated elastomeric polymer is selected from the group consisting of ABA block copolymers; AB block copolymers; multiarmed (AB)x block copolymers and mixtures thereof, wherein A is a block comprising at least one monoalkenyl arene, B is an elastomeric conjugated diene block and x has a value greater than 2.
8. A pressure-sensitive adhesive as claimed in claim 3 in which the unsaturated elastomeric polymer is selected from the group consisting of ABA block copolymers; AB block copolymers; multiarmed (AB)x block copolymers and mixtures thereof, wherein A is a block comprising at least one monoalkenyl arene, B is an elastomeric conjugated diene block and x has a value greater than 2.
9. A pressure-sensitive adhesive comprising a free radical cured mixture comprising from about 15 to about 60 parts by weight of an unsaturated styrene-isoprene-styrene block copolymer and from about 85 to about 40 parts by weight tackifying organic additive which is substantially nonresponsive to the action of free radicals and selected from the group consisting of saturated aromatic resins, saturated aliphatic resins, saturated oils and mixtures thereof and an effective amount up to about 10 parts by weight polythiol crosslinking agent, said pressure-sensitive adhesive having a higher elevated temperature shear as compared to the mixture prior to cure and a glass transition temperature at least 10° C. below use temperature said cured mixture when at a proportion of 40 parts by weight elastomeric polymer and 60 parts b weight organic additive and in the absence of the polythiol cross linking agent having relative incipient gel dosage at cure at an electron beam dosage of 200 KV of no more than about 1.65.
10. A pressure-sensitive adhesive as claimed in claim 9 in which is present prior to cure an end block reinforcing agent which is compatible with the styrene blocks.
11. A pressure-sensitive adhesive comprising a free radical cured mixture comprising, based on the weight of the mixture, from 15 to about 60 parts by weight of the mixture, a multiarmed styrene-isoprene block copolymer and from about 40 to about 85 parts by weight of the mixture of an organic additive which is substantially non-responsive to the action of free radicals and selected from the group consisting of saturated aromatic resins, saturated aliphatic resins and mixtures thereof and an effective amount up to about 10 parts by weight polythiol cross-linking agent, said pressure-sensitive adhesive having a high elevated temperature shear as compared to the mixture prior to cure and a glass transition temperature of at least 10° C. below use temperature said cured mixture when at a proportion of 40 parts by weight elastomeric polymer and 60 parts by weight organic additive and in the absence of the polythiol cross-linking agent having relative incipient gel dosage at cure at an electron beam dosage of 200 KV of no more than about 1.65.
12. A pressure-sensitive adhesive as claimed in claim 1 in which is present prior to cure an end block reinforcing agent which is compatible with the styrene blocks.
13. A pressure-sensitive adhesive comprising a free radical cured mixture comprising, based on the weight of the mixture, from 15 to about 60 percent by weight of a styrene-butadiene-Styrene block copolymer and from about 40to about 85 parts by weight of an organic additive which is substantial non-responsive to the action of free radicals and selected from the group consisting of aromatic resins and mixtures thereof with saturated aromatic, saturated aliphatic and saturated oils, and an effective up to about 10 parts by weight polythiol cross-linking agent, said pressure-sensitive adhesive having a high elevated temperature shear as compared to the mixture prior to cure and a glass transition temperature of at least 10° C. below use temperature said cured mixture when at a proportion of 40 parts by weight elastomeric polymer and 60 parts by weight organic additive and in the absence of the polythiol cross-linking agent having relative incipient gel dosage at cure at an electron beam dosage of 200KV of no more than about 1.65.
14. A pressure-sensitive adhesive as claimed in claim 13 in which is present prior to cure an end block reinforcing agent which is compatible with the styrene blocks.
This invention is directed to reducing the energy requirements to improve the properties of multicomponent polymer systems which form pressure-sensitive adhesives.
Properties of unsaturated pressure sensitive adhesive compositions can be improved by use of actinic radiation, such as ultraviolet (UV) radiation; electron beam (EB) radiation; and chemical or thermal cure. Normally, the adhesive is applied to facestock and/or a release liner and subjected to a suitable curing action to improve such properties as elevated temperature shear.
According to the present invention, there are provided pressure-sensitive adhesive compositions which comprise in combination at least one unsaturated elastomeric polymer capable of undergoing gel forming reactions in the presence of free radicals preferably generated by actinic radiation or electron beam radiation, and at least one organic additive which is substantially nonresponsive to free radicals and which is at least dispersable and preferably soluble in the elastomeric polymer. The elastomeric polymer preferably has a glass transition temperature of from about -20° to about -100° C. The organic additive affects a property of the pressure-sensitive adhesive composition, such as tack or other properties. The improvement resides in the use of a organic additive which is substantially nonresponsive to the action of free radicals, as defined herein, while providing, upon cure, a pressure-sensitive adhesive composition having a glass transition temperature of at least 10° C., preferably at least 20° C. below use temperature.
FIG. 1 illustrates the EB dosage requirements to achieve incipient gel formation using unsaturated tackifiers in unsaturated elastomers as a function of tackifier concentration;
FIGS. 2 and 3 establish as compared to a free radical consuming tackifier, that use of dosage for tackifying organic additives employed in accordance with this invention will not change the incipient gel dosage of unsaturated elastomeric copolymer to which they are added in varying concentrations;
FIG. 4 illustrates the effect of unsaturation on relative incipient gel dosage as a function of tackifier concentration for aromatic tackifiers at different levels of hydrogenation; and
FIG. 5 compares the relative incipient gel dosage as function of tackifier concentration for Excorez™1310, Foral™85 and Regalrez™1033.
The present invention is directed to reducing the energy requirements of free radical cross-linking of unsaturated elastomeric polymers which are part of multicomponent compositions such as pressure-sensitive adhesives in which unsaturated elastomeric polymers are tackified or otherwise modified as to physical properties by addition of at least one organic additive.
Properties of the pressure-sensitive adhesive composition are, in accordance with the present invention, enhanced by free radical cure, with free radicals preferably generated by electron beam (EB) radiation, or actinic radiation, such as ultraviolet (UV) curing, with or without photoinitiators and/or photosensitizers. The invention also contemplates thermal curing with or without thermal initiators. The improvement resides in utilizing as a property modifying additive, an organic additive which is substantially nonresponsive to the action of free radicals.
Preferably, the elastomeric block polymers to which the invention is directed are ABA block or multiarmed (AB)x block copolymers, wherein x has a value of 2 or more and mixtures thereof and wherein A is a block comprising at least one monoalkenyl arene, preferably styrene, alpha methyl styrene, vinyl toluene and the like, and B is an elastomeric conjugated diene block such as a polybutadiene or a polyisoprene block with polyisoprene blocks preferred.
More preferably, the elastomeric copolymers are formed of styrene-butadiene-styrene block copolymers and/or styrene-isoprene-styrene block, multiarmed styrene-isoprene block copolymers, polybutadiene and polyisoprene. Mixtures of elastomers may be employed.
Unsaturated elastomeric polymers forming the base resin of the invention are or may be adapted to hot melt, solvent or emulsion coating. They are preferably free radical cross-linked using actinic radiation, with or without a photoinitiator, or by electron beam (EB) radiation. Cure is to overcome the major deficiency of pressure-sensitive adhesives based on unsaturated elastomeric polymers, namely, to have acceptable elevated temperature cohesive strength. Crosslinking of the base polymer has been used to enhance cohesive properties of the adhesives especially to improve elevated temperature shear performance. Thermal crosslinking has been the most commonly used method limited to solution or emulsion polymers.
Thermal crosslinking during hot melt processing of unsaturated elastomeric polymers has been the most difficult to achieve due to undesirable and premature crosslinking during compounding, storage and coating operations. As a consequence in-line mixing of crosslinking agents with a melt has been required to avoid premature cure.
Actinic and Electron Beam radiation can overcome this difficulty; however, if external crosslinkers are included, thermal instability may become a problem.
All systems can benefit by the use of external crosslinkers. Crosslinkers which are multifunctional monomers such as acrylates and methacrylates are thermally reactive and the process to achieve cure also requires in-line mixing to avoid premature crosslinking independent of the ultimate means of cure. The same is true of other crosslinking agents which are functional at much lower concentrations. Polythiol crosslinkers, for instance, are functional at concentrations of about 10% or less by weight of the total composition. The polythiol cross-linkers include for instance, pentaerythritoltetrathioglycolate, pentaerythritol-tetra(3-mercaptopropionate), trimethylolethanetrimercaptopropionate, trimethylolpropanetrithioglycolate, trimethylolpropane tri(3-mercaptopropionate) and the like.
As with the multifunctional acrylates and methacrylates, the polythiol cross-linkers are preferably added to the composition by in line mixing. The purpose is to avoid premature crosslinking before cure the pressure senstive adhesive composition.
As examples of organic additives which are substantially nonresponsive to free radicals there may be mentioned hydrogenated organic compounds, such as hydrogenated aromatic resins including hydrogenatedpolystyrene, polyalpha-methyl styrene, polyvinyl toluene, copolymers of styrene with other monomers and the like; hydrogenated aliphatic resins derived from petroleum based products; highly hydrogenated rosins and rosin esters; hydrogenated white oil, mineral oil and the like. As specific tackifiers employed in the practice of the invention there may be mentioned hydrogenated styrene based resins such as Regalrez™ resins designated as 1018, 1033, 1065, 1078, 1094 and 1126 manufactured and sold by Hercules, Inc.; Regalrez™ 6108 a 60% hydrogenated aromatic resin, also manufactured by Hercules; hydrogenated C5 and/or C9 hydrocarbon feed stocks such as Arkon™ P-70, P-90, P-100, P-125, P115, M-90, M-100, M-110 and M-120 resins manufactured and sold by Arakawa Chemical and Regalite™ R-100, MGB-63, MGB-67, MGB-70, resins manufactured and sold by Hercules, Inc.; hydrogenated Polycyclo-pentadienes such as Escorez™ 5320, 5300 and 5380 resins manufactured and sold by Exxon Chemical, hydrogenated polyterpene and other naturally occurring resins such as Clearon™ P-105, P-115, P-125, M-105, M-115 manufactured and sold by Yasuhara Yushi Kogyo Co. Ltd. of Japan and Eastotack™ H-100, H-115 and H-130 resins manufactured and sold by Eastman chemical and the like; Kaydol™ hydrogenated mineral oil manufactured and sold by Witco Chemical and the like.
Linear styrene-isoprene (SI) and styrene-isoprenestyrene (SIS) block copolymers do not perform as well as multi-armed (SI) polymers in forming radiation-cured pressure sensitive adhesives at lower curing doses. This problem may be solved by the use of organic additives of this invention which, unlike most conventional tackifiers, do not consume an excessive amount of radical during crosslinking thereby conserving cost and product quality.
I have found that high molecular weight styrene-isoprene multi-armed block copolymers, alone or together with other elastomers, such as SB, SBS and SIS when formulated with organic additives which are saturated, hydrogenated tackifying resins give pressure sensitive adhesive formulae which show superior ease of cure and when cured superior elevated temperature shear properties. Properties after cure, match or surpass the elevated temperature shear performance of any hot melt adhesives commercially available.
Presently prefered formulation ranges for high performance pressure-sensitive adhesives containing multiarmed (or radial) styrene-isoprene block copolymers are on a by weight basis as follows:
The following Examples and Controls are designed to illustrate the instant invention.
Base unsaturated elastomeric polymers used were a mixture of linear styrene-isoprene-styrene (SIS) and styrene-isoprene (SI) block copolymers known as Kraton™ D-1107 and D-1111; styrene-butadiene-styrene (SBS) block copolymers known as Kraton™ D-1101 and D-1102 and DX-1300 and multi-armed (SI)x block copolymer known as Kraton™ D-1320X1 all manufactured and sold by Shell Chemical Company and styrene-butadiene block copolymer known as Solprene™ 1205 manufactured and sold by Housemex, Inc. As representative of an unsatisfactory tackifying unsaturated alphatic resin there was used Escorez™ 1310, a petroleum based hydrocarbon resin manufactured and sold by Exxon Chemical Company, and Piccolite™ A115, an alpha-pinene resin manufactured and sold by Hercules, Inc. Foral-85, a well known hydrogenated rosin ester manufactured and sold by Hercules, Inc. may be functional or nonfunctional as an organic additive depending on the elastomer(s) it is combined with. The organic additives which are used to illustrate the instant invention are of the Escorez™ 5000 series. Also used to illustrate the practice of the invention are Regalrez™ 6108, 1078 and 1000 series of resins. Kaydol™ mineral oil was as a representation of hydrogenated oil. The invention is primarily illustrated in respect of effect of unsaturation of the organic compound, namely, a tackifier, on incipient or relative incipient gel dosage (the incipient gel dosage of a mixture divided by the incipient gel dosage of the elastomer) required to initiate gel formation versus resin concentration in percent by weight. Incipient gel dosage is measured as defined above. To establish product properties, the formulation was coated from toluene onto a release paper (50 g/m2), dried in an oven and laminated to a 50 micron thick polyester film. EB radiation was through the polyester film. 180° Peel in Newtons per Meter (N/M) were determined using PSTC-1 at 20 minute dwell. Loop tack was measured by forming a loop from a 1 inch by 8 inch strip, adhesive face out, inserted in the jaws of an Instron tester and moving the loop at the rate of 12 inches per minute onto a stainless steel panel, then removing the strip at the rate of 12 inches per minute as soon as one square inch of contact is made. The highest force required to remove the loop is reported in N/M. Shear reported in Kiloseconds (K.S.) was for 0.5×0.5 inch overlap on a stainless steel at a 500 gram force load.
The study was performed to establish the effect of using conventional tackifying resins to tackify elastomers on the electron beam (EB) dosage required to achieve incipient gel formation as a function of tackifier (resin) content. There was employed SIS elastomeric polymers known as Kraton™ D-1107 (Control 1), SBS block copolymers Kraton™ D-1101 (Control 2) and DX 1300 (Control 3) and Kraton™ D-1320X, a multi-armed styrene-isoprene block copolymers (Control 4).
The study established, first of all, the base level of EB dosage necessary to achieve a cohesive strength improvement as evidenced by gel formation in the base elastomer, more particularly, where at least 10% of the elastomer of adhesive composition formed an insoluble gel. FIG. 1 shows that incipient gel dosage increases dramatically as the elastomer is diluted with conventional tackifiers. Since conventional elastomer based pressure-sensitive adhesives contain about 40-90% by weight added tackifying resins, this means that the typical adhesive formulations required an EB dosage of 2-5 times higher than the dosage required for the elastomer itself to achieve an incipient gel formation when an unsaturated C-5 hydrocarbon Escorez™ 1310, (Controls 1 and 4) and Piccolite A-115 alpha-pinene (Controls 2 and 3) tackifiers are used as the tackifying resins. The elastomer requiring the lowest dosage was the multiarmed (SI)x copolymer.
FIG. 2 shows the relative EB dosage level required to achieve incipient gel formation for the compositions there was used Regalrez™ 1033 an 100% hydrogenated (saturated) aromatic resin manufactured by Hercules, Inc. (Example 1) and Escorez™ E-5380, a saturated aliphatic hydrocarbon manufactured by Exxon (Example 2). The comparison was Control 1. As can be seen incipient dosage to gel increased in proportion to the amount of unsaturated tackifying resin introduced to the rubber whereas the use of the hydrogenated tackifiers causes the incipient dosage to remain the same or in some instances reduced.
Using the same procedure as the previous Examples and Controls, FIG. 3 shows the effect of a saturated tackifier , Escorez™ 5380, (Example 3) and an unsaturated tackifier, Escorez™ 1310 (Control 5) have on the relative incipient gel dosage required to achieve gel formation for a multi-armed styrene-isoprene block copolymer (Kraton™-D-1320X).
Controls 6 and 7 EXAMPLES 4 to 7
Table 1 tabulates the improved high temperature properties induced to Kraton™ D-1107 and Kraton™ D-1320X using as the saturated tackifier Regalrez™ 1078. While 180° peel remain essentially unchanged there is dramatic improvement in elevated temperature shear.
TABLE 1__________________________________________________________________________Component Parts        Cont 6             Ex 4 Ex 5 Cont 7                            Ex 6 Ex 7__________________________________________________________________________Kraton &#8482; D-1107        35   35   35   --   --   --Kraton &#8482; D-1320X        --   --   --   35   35   35Regalrez &#8482; 1078        65   65   65   65   65   65Antioxidant  1    1    1    1    1    1EB Dosage, kGy        0    75   100  0    75   100180° Peel at 23° C., (N/M)        1490 1770 1460 1690 1220 1320180° Peel at 70° C., (N/M)        350  440  310  320  390  320Looptack, (N/M)        1490 2300 2350 1690 1220 1320Shear at 70° C., (K.S.)        1.1  4.4  7.2  0.15 7    17.8__________________________________________________________________________
FIG. 4 shows the relative incipient gel formation dosage for Kraton™ D-1107 using an aromatic tackifier of different levels of unsaturation. They are manufactured and sold by Hercules, Inc., under the designation Piccolastic™ A-50 (0% hydrogenated), Regalrez™ 3102 (30% hydrogenated); Regalrez™ 6108 (60% hydrogenated) and Regalrez™ 1033 (100% hydrogenated). As shown in FIG. 4, the higher the degree of hydrogenation the lower the dosage required, for a given level of resin concentration, to form a gel. This is important since a certain amount, usually 30-40% of the base rubber, must be crosslinked to form a network in order to achieve a significant improvement in physical properties.
Endex™ 160 is an aromatic end-block reinforcing resin compatible with the polystyrene phase of the block copolymer Kraton D-1107 but not compatible with the elastomeric polyisoprene phase. It does not substantially interfere with crosslinking in presence of an organic additive (Table 2) or a blend thereof (Table 3) but synergistically provided exceptionally high elevated temperature shear strength on EB cure.
The formulations in parts by weight is shown in Table 4 and the adhesive properties as a function of EB dosage in Table 5 wherein "ETS" means elevated temperature shear in kiloseconds.
TABLE 4______________________________________Formula Elastomer  Escorez &#8482; 5300                         Regalrez &#8482; 1065______________________________________1     30         11.7         58.32     30         30.9         39.13     40         44.2         15.8______________________________________
TABLE 2__________________________________________________________________________      Cont 10           Ex 10                Cont 11                     Ex 11                          Cont 12                               Ex 12__________________________________________________________________________Kraton D-1107, parts      40   40   40   40   40   40Regalrez 1078, parts      60   60   60   60   60   60Endex 160, parts      --   --   10   10   15   15Antioxidant, parts      1    1    1    1    1    1EB dosage (kGy)      0    75   0    75   0    75180° Peel, (N/M)      1110 1160 1350 1220 1190 1000Looptack, (N/M)      1890 1880 2250 1860 1890 154070° C. Shear (K.S.)      0.1  3.2  3.2  50.1 6.7  81.7__________________________________________________________________________
TABLE 3__________________________________________________________________________      Cont 13           Ex 13                Cont 14                     Ex 14                          Cont 15                               Ex 15__________________________________________________________________________Kraton D-1107, parts      40   40   40   40   40   40Regalrez 1078, parts      40   40   40   40   40   40Escorez 5320, parts      20   20   20   20   20   20Endex 160, parts      0    0    10   10   15   15Antioxidant, parts      1    1    1    1    1    1EB dosage (kGy)      0    75   0    75   0    75180° Peel, (N/M)      1340 1300 1340 1430 1360 1260Looptack, (N/M)      2170 2140 1570 1710 1540 77070° C. Shear, (K.S.)      6    60.3 69.1 807  51.4 854__________________________________________________________________________
TABLE 5__________________________________________________________________________Cont/ExFORMULA       EB DOSE (kGy)                LOOPTACK                       180° PEEL, RT                               180° PEEL, 70° C.                                        ETS, 70° C.__________________________________________________________________________Cont. 161       0       2550   1670    140      0.2Ex. 161      75       2410   1620    190      9.9Cont. 172       0       2570   1600     65      0.1Ex. 172      75       1260   1520    265      25.2Cont. 182       0       1950   1350    245      3.0Ex. 183      75       1220   1240    280      218.2__________________________________________________________________________
Control 19 and Examples 20 to 25
Table 6 establishes that other saturated compounds, namely brominated hydrocarbon fire retardants, can be successfully added to Kraton™ 1107 and reduce incipient gel dosage.
Control 20 and Examples 26-29 are for the combination of an SBS copolymer Kraton™ D-1102 tackified with a mixture of Regalrez™ 6108 and Kadol Oil a hydrogenated mineral oil in the presence of trimethylolpropane tri(3-mercaptopropionate) as a multifunctional polythiol crossliner. As can be seen in Table 7, the combination gives on cure excellent elevated temperature shear.
TABLE 6__________________________________________________________________________Cont/ExKraton &#8482; D-1107         BCL-462              HBCDD                   BE-51                       PYROCHEK                              INCIPIENT GEL(kGy)__________________________________________________________________________Cont. 19      --   --   --  --     85Ex. 2098       2    --   --  --     55Ex. 2195.2     4.8  --   --  --     55Ex. 2287       13   --   --  --     55Ex. 2395.2     --   4.8  --  --     65Ex. 2495.2     --   --   4.8 --     55Ex. 2595.2     --   --   --  4.8    65__________________________________________________________________________ Staytex &#8482; BCL-462 = 1,2dibromoethyl-3,4-dibromocyclohexane (Ethyl Corp). HBCDD = hexabromocyclodecane (Great Lakes Chemical) BE-51 = tetrabromobis-phenol-A, bis(allyl ether) (Great Lakes Chemical) Pyrochek &#8482; 68DB = poly(tribromostyrene) (Ferro Corp.)
TABLE 7__________________________________________________________________________       Cont 15            Ex 26                 Ex 27                      Ex 28                           Ex 29__________________________________________________________________________Kraton D-1102       40   40   40   40   40Regalrez 6108       50   50   50   50   50Kaydol Oil  10   10   10   10   10TMPTMP*     0    0.6  0.6  1    1Antioxidant 1    1    1    1    1EB dosage (kGy)       0    20   50   20   50180° Peel, (N/M)       1390 1180 1120 1130 1060Looptack, (N/M)       1750 1352 1770 1850 111070° C. Shear, (K.S.)**       1    2.3  120+***                      11.8 120+***__________________________________________________________________________ *TMPTMP is trimethylolpropane tri(3mercaptopropionate) **Weight is 1000 g and overlap area is 1 sq. in. ***No failure
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