Patent GB-1317681-A (GB)
Title: Self adhering coating compositions
IPC: C09D157/00
Filed: 1971-06-08
Abstract: 1317681 Coating M & T CHEMICALS Inc 8 June 1971 [8 June 1970] 19431/71 Heading B2E [Also in Division C3]  Self-adhering coating compositions comprise ingredients (a) to (i) below, ingredients (g) and (i) being optional, and the total of (a) to (i) being 100 parts by weight. The compounds shown in parentheses in each case are those actually used in the specific Examples, but others are specified. (a) 16.0-34.2 parts of a first resin (selected from a given list) having a relative viscosity of 1.98-2.35, a molecular weight of 75,000-101,000 and an average particle size of 0.5-7.0 microns (e.g. polyvinyl chloride or vinyl chloride/vinyl acetate copolymer); (b) 3.8-24.0 parts of a second halogen-containing resin having a specific viscosity of about 0.50, an inherent viscosity of about 1.20, a molecular weight average of about 127,000, and a particle size of 7-177 microns (e.g. polyvinyl chloride); (c) 1.0-7.6 parts of a third vinyl solution resin having reactive sites (e.g. -OH or -COOH) and an inherent viscosity of 0.34-0.46, and comprising 75.0-91.5% of vinyl chloride units copolymerised with at least one of vinylidene chloride, vinyl acetate or an ester of maleic acid (e.g. a mixture of a partially hydrolysed vinyl chloride/vinyl acetate copolymer and a vinyl chloride/vinyl acetate/maleic acid copolymer); (d) 0.2-3.8 parts of a liquid epoxy resin having a viscosity of 10,000-20,000cp and an epoxy equivalent weight of 180-220. (e.g. those available under the Trade Names "Epon 828" and "ERL-2774"); (e) 1.2-14.7 parts of an amine-containing resin (e.g. a butylated urea-formaldehyde resin); (f) 17-30.4 parts of a plasticizer in which resins (a) and (b) are insoluble or sparingly soluble at 20- 35‹C and which is capable of completely dissolving resin (c) (e.g. diisodecyl phthalate or a mixture thereof with tricresyl phosphate and chlorinated triphenyl); (g) up to 15.3 parts of a solvent-diluent which, when present, cooperates with the plasticizer to dissolve resins (c), (d) and (e) but which does not dissolve or gel resins (a) and (b) at 20-35‹C (e.g. a mixture of xylene with a solvent known under the Trade Mark "Cellosolve acetate"); (h) 3.0- 23.7 parts of pigments and/or fillers (e.g. mixtures of two or more of titanium dioxide, calcium carbonate, antimony trioxide and talc); and optionally (i) 1.6-2.5 parts of at least one PVC stabilizer (e.g. an organo-tin compound mixed with 2, 4, 6-tritertbutyl phenol). The compositions may additionally contain a flame retardant agent, e.g. antimony trioxide, triphenyl antimony, zinc borate and pentachlorophenol. The compositions may be applied as such or in diluted form, a particularly suitable diluent being a mixture of equal parts of n-butanol, ethylene glycol monoethyl ether acetate and an aromatic hydrocarbon such as benzene or xylene. The coatings formed from the compositions may be cured. Substrates mentioned are gypsum board (in Example 5), paper overlay board, hardboard, plywood, particle board, ceramic surfaces, cement-asbestos board, cement blocks containing metal, and metal articles including wire structures, rods and bars.