Vinyl halide polymer/epoxide resin powder coating compositions
阅读：383发布：2024-02-03
专利汇可以提供Vinyl halide polymer/epoxide resin powder coating compositions专利检索，专利查询，专利分析的服务。并且The disclosed self-primed vinyl coating compositions are dry powders at room temperature. These powders contain a heatactivatable epoxy adhesive system either absorbed onto the surface of the vinyl powder or otherwise intimately blended therewith. By selecting sufficiently latent co-curatives and catalysts for the adhesive system and blending them with the vinyl, the shelf-life of the composition can be preserved without any loss of the self-priming capability of the composition.，下面是Vinyl halide polymer/epoxide resin powder coating compositions专利的具体信息内容。
2. A free flowing dry blend as defined in claim 1 coated and adhered to a metal substrate, the resulting coating comprising said epoxide, cured by said curing agent, uniformly distributed through said coating.
3. A free flowing dry blend as defined in claim 1 wherein the catalyst is a metal salt-imidazole and the blend also includes 0.2-2.0 equivalents, per equivalent of said epoxide, of a curing agent for the epoxide, which curing agent is selected from the group consisting of a dihydrazide, a polyacid anhydride of a carboxylic acid, and dicyandiamide or a derivative thereof.
4. A free flowing dry blend as defined in claim 3 wherein said curing agent is a dihydrazide.
5. A free flowing dry blend as defined in claim 1 wherein the catalyst is nickel chloride-imidazole.
6. A free flowing, intimately admixed dry blend consisting essentially of: a free flowing, particulate polyvinyl chloride homopolymer having an average particle size in the range of 100-150 microns and capable of absorbing at least 35 parts of plasticizer on particle surfaces without significant agglomeration of particles, 5-30 parts by weight, per 100 parts by weight of said free flowing, particulate polyvinyl chloride homopolymer, of a polyglycidyl ether of bisphenol A having an epoxide functionality in the range of 1.7-2.5, 5-35 parts by weight, per 100 parts by weight of said free flowing, particulate polyvinyl chloride homopolymer, of an oily liquid plasticizer comprising a diester of an alkanol of one to 18 carbon atoms or a dicarboxylic acid, said oily liquid plasticizer being absorbed into said free flowing particulate polyvinyl chloride homopolymer, a catalytic amount, not exceeding about one part by weight per 100 parts by weight of said free flowing particulate polyvinyl chloride homopolymer, of a metal salt-imidazole catalyst, 1-10 parts, per 100 parts by weight of said free flowing particulate polyvinyl chloride homopolymer, of an organometallic vinyl stabilizer, and 0.5-10 parts by weight, per 100 parts by weight of said free flowing polyvinyl chloride homopolymer, of an anti-agglomerating agent comprising a polyvinyl chloride powder having particles less than about 1 micron in size.
7. A free flowing, intimately admixed dry blend of (1) 100 parts by weight of a free flowing, particulate vinyl halide polymer having an average particle size larger than 75 microns but smaller than 420 microns and capable of absorbing at least 35 parts of plasticizer on particle surfaces without significant agglomeration of particles, (2) 1-60 parts of a curable epoxide and selected from (a) a polyglycidyl ether of a polyhydric aliphatic alcohol or a polyhydric phenol and (b) a cycloaliphatic epoxide, (3) up to 60 parts of a plasticizer for said vinyl halide polymer, and (4) up to 25 parts of an anti-agglomeration agent comprising a vinyl powder less than 74 microns in size, characterized by the feature that the blend includes a catalytic amount, but not more than one part, of a metal imidazolate latent catalyst and the blend also contains 0.2-2.0 equivalents, per equivalent of said epoxide, of a curing agent for the epoxide, which curing agent is selected from the group consisting of a dihydrazide, a polyacid anhydride of a polycarboxylic acid, and dicyandiamide or a derivative thereof.
8. A free flowing, intimately admixed dry blend consisting essentially of: a free flowing, particulate polyvinyl chloride homopolymer having an average particle size in the range of 100-150 microns and capable of absorbing at least 35 parts of plasticizer on particle surfaces without significant agglomeration of particles, 5-30 parts by weight, per 100 parts by weight of said free flowing, particulate polyvinyl chloride homopolymer, of a polyglycidyl ether of bisphenol A having an epoxide functionality in the range of 1.7-2.5, about 0.4-1.0 equivalent, per epoxide equivalent of said polyglycidyl ether of bisphenol A, of an aliphatic dihydrazide, 5-35 parts by weight, per 100 parts by weight of said free flowing, particulate polyvinyl chloride homopolymer, of an oily liquid plasticizer comprising a diester of an alkanol of 1-18 carbon atoms and a dicarboxylic acid, said oily liquid plasticizer being absorbed into said free flowing particulate polyvinyl chloride homopolymer, a catalytic amount, not exceeding about one part by weight per 100 parts by weight of said free flowing particulate polyvinyl chloride homopolymer, of a metal imidazolate epoxide ring-opening catalyst, 1-10 parts, per 100 parts by weight of said free flowing particulate polyvinyl chloride homopolymer, of an organometallic vinyl stabilizer, and 0.5-10 parts by weight, per 100 parts by weight of said free flowing polyvinyl chloride homopolymer, of an anti-agglomerating agent comprising a polyvinyl chloride powder having particles less than about 1 micron in size.
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