Source: http://www.google.com/patents/US4898849?dq=6,240,376
Timestamp: 2015-05-28 09:33:43
Document Index: 162315656

Matched Legal Cases: ['Application No. 58', 'Application No. 58', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 82', 'Application No. 82']

Patent US4898849 - Coated thermally printable material and method of producing the same - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsDisclosed is a heat-sensitive recording material useful in the manufacture of thermal paper and thermal labels. The material comprises a cellulosic or other suitable substrate, a thermally imprintable color-producing layer, and a protective layer over the color-producing layer. It may also include a...http://www.google.com/patents/US4898849?utm_source=gb-gplus-sharePatent US4898849 - Coated thermally printable material and method of producing the sameAdvanced Patent SearchPublication numberUS4898849 APublication typeGrantApplication numberUS 07/139,186Publication dateFeb 6, 1990Filing dateDec 29, 1987Priority dateDec 29, 1987Fee statusPaidAlso published asCN1012489B, CN1035901A, EP0355146A1, EP0355146A4, WO1989006191A1Publication number07139186, 139186, US 4898849 A, US 4898849A, US-A-4898849, US4898849 A, US4898849AInventorsMing-Huang J. KangOriginal AssigneeNashua CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (11), Non-Patent Citations (8), Referenced by (40), Classifications (34), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetCoated thermally printable material and method of producing the same
US 4898849 AAbstract
Disclosed is a heat-sensitive recording material useful in the manufacture of thermal paper and thermal labels. The material comprises a cellulosic or other suitable substrate, a thermally imprintable color-producing layer, and a protective layer over the color-producing layer. It may also include a second protective layer and/or a pressure-sensitive adhesive layer, on the surface of the substrate opposite from the color-producing layer, and a releasable liner covering the adhesive layer. The color-producing layer includes a basic, acid-neutralizing agent for both reducing background discoloration during manufacturing and increasing image definition. The protective layer comprises a cross-linked binder and fluorochemical surfactant-treated hydrocarbon or fluorocarbon particles as a friction reducing material.
1. A heat-sensitive recording material comprising:A. a substrate; B. a thermal imagewise imprintable color-producing layer affixed to a first surface of said substrate comprising a leuco dye developable upon exposure to an acidic developer, an acidic developer, and a binder material for said dye and developer; and C. a protective layer overlying said color-producing layer, wherein said protective layer comprises;an organic water soluble resin cross-linked during its formation in situ atop said color-producing layer and containing dispersed friction reducing polymer particles and a fluorocarbon surfactant, said material being characterized by decreased surface friction and resistance to background discoloration and image fading induced by exposure to solvents. 2. The material of claim 1 wherein said protective layer comprises an organic resin film cross-linked during its formation on said substrate by an acid-catalyzed, covalently acting cross-linking agent.
This invention relates to a heat-sensitive recording material. More particularly, the invention relates to a heat-sensitive material including a solvent resistant and friction reducing protective layer useful in the manufacture of adhesive-backed heat-sensitive labels and other thermally sensitive paper stock used in printers and facsimile equipment. The labels are useful in packaging goods which, in transit, storage, or display, may be exposed to diverse solvents, and may be used on meat, produce, or articles of manufacture commonly exposed to water or oleophilic materials. A bar code and/or alphanumeric information may be formed on such labels at the point of sale by imaging the label with a thermal print head.
In one aspect, the invention features a specialty paper or label stock comprising a heat-sensitive recording material. The material comprises a substrate, a heat-sensitive color-producing layer on a first surface of the substrate, and a protective, cross-linked, friction reducing layer over the color-producing layer. An adhesive layer may be applied on the surface of the substrate opposite the color-producing layer. Preferably, the adhesive is a pressure-sensitive adhesive and is covered with an adhesive, releasable liner.
The approach to production of the improved thermally sensitive labels, sheets, etc. embodying the invention is to apply the barrier layer directly over a previously applied thermally sensitive layer. To produce the thermal layer, one prepares a first dispersion containing the leuco dye and other ingredients set forth below, a second dispersion comprising the acidic developer material and particulate neutralizing agent, then mixes the dispersions, and applies the product to a substrate.
The protective coating is prepared by adding to 100 parts of a 5% polyvinyl alcohol solution (e.g., Vinyl 165), 0.4 parts fumaric acid, 1.4 ppm amine perfluoralkyl sulfonate (e.g., Fluorad FC-99, 3M company), and 0.036 part dispersant (e.g., Darvan No. 7, Vanderbilt Co.), 6 parts alumina trihydrate (e.g., Hydral 710, Alcoa) and 0.18 parts polyethylene powder (e.g., polymist A12, Allied Chemical Co.). This mixture is dispersed in a Waring blender for a period of 20 minutes. To the resulting solution is added one part aminoplast resin curing agent (e.g., Cymel 385, melamine formaldehyde) and 0.01 parts of a wetting agent (e.g., Triton X-100). This composition is then applied to a previously coated substrate with a Meyer rod at a surface density of about 4 grams/m2.
Following the procedure of Example I, a protective coating is prepared by adding to 100 parts of a 5% polyvinyl alcohol solution, 1 part fumaric acid, 2.7 ppm amine perfluoralkyl sulfonate, 0.027 parts dispersant, 4.5 parts alumina trihydrate, and 34 parts particulate polytetrafluoroethylene (SST-3H Shamrock Chem. Corp.). This mixture is dispersed in a Waring blender for 20 minutes. To the resulting solution is added 1 part of melamine formaldehyde cross-linking agent (Cymel 385) and 0.01 parts of a wetting agent. This dispersion is applied to the coated substrate with a Meyer rod at a coating weight of about 4.5g/m2.
Following the procedure of Example I, a protective coating is prepared by adding to 100 parts of a 5% aqueous polyvinyl alcohol solution 1 part fumaric acid, 2.4 ppm amine perfluoralkyl sulfonate, 0.039 parts dispersant, 9 parts alumina trihydrate, 0.27 parts particulate polyethylene, and 0.27 parts particulate polytetrafluoroethylene. This mixture is dispersed in a Waring blender for 20 minutes. To the resulting solution is added 0.82 parts melamine formaldehyde resin and 1 part wetting agent. This dispersion is then deposited on the coated substrate with a Meyer rod at a surface density of 4-5 g/m2.
Experiments were conducted to assess the effect of the fluorinated surfactant on image density retention in thermal labels using the oil resistance test. Four batches of protective barrier coating compositions having the ingredients set forth below were coated over the same thermally sensitive coating. Each of the labels was imprinted, measured for image density, subjected to oil resistance test described above, and then remeasured for image density. The percent image density loss is noted for each sample.
Effect of Fluorocarbon Surfactant on Image Density Loss Using Oil Resistance Test
______________________________________Effect of Fluorocarbon Surfactant on ImageDensity Loss Using Oil Resistance TestComposition   A       B       C     D______________________________________binder resin  100     100     100   100cross-linking agent         52.7    52.7    52.7  15.8fluorinated surfactant         --      --      --    7.2 � 10-3lubricating particles         1.33    4.00    6.67  9.00alumina trihydrate         133     133     133   120Percent loss of         55.4    68.5    80.6  7.70Image Density______________________________________
Using the procedure of Example I, a coating composition was formulated using the following relative parts by weight.
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