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Coating powders for use in the preparation of protective films comprising a mixture of a caprolactam-blocked organic polyisocyanate and a hydroxy-containing polyester or a hydroxy-containing acrylic or methacrylic polymer, wherein the acrylic or methacrylic polymer is derived from the polymerization

Coating powders for use in the preparation of protective films comprising a mixture of a caprolactam-blocked organic polyisocyanate and a hydroxy-containing polyester or a hydroxy-containing acrylic or methacrylic polymer, wherein the acrylic or methacrylic polymer is derived from the polymerization reaction of a hydroxy lower alkyl acrylate or methacrylate, one or more lower alkyl acrylates or methacrylates, and optionally styrene or vinyl toluene. The proportions of the e

대표청구항 ▼

A coating powder for use in the preparation of protective films which comprises an intimate mixture of: i. a caprolactam-blocked organic polyisocyanate and ii. A film-forming hydroxy-containing polyester, or a film-forming hydroxy-containing polymer obtained by reacting from 10-30 parts of a hydroxy

A coating powder for use in the preparation of protective films which comprises an intimate mixture of: i. a caprolactam-blocked organic polyisocyanate and ii. A film-forming hydroxy-containing polyester, or a film-forming hydroxy-containing polymer obtained by reacting from 10-30 parts of a hydroxy lower alkyl acrylate or methacrylate, from 35-45 parts of a lower alkyl acrylate or methacrylate and from 35-45 parts of styrene or vinyl toluene, wherein the polyisocyanate is present in sufficient quantity to provide from about 0.8 to 1.20 blocked isocyanate groups for each hydroxy group in the coating powder, the caprolactam-blocked organic polyisocyanate component (i) being a 1:1 molar mixture of (a) a caprolactam-blocked aliphatic or aromatic polyisocyanate selected from the group consisting of isophorone diisocyanate, 4,4′-methylene bis-(cyclohexyl isocyanate), toluene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, propylene-1,2-diisocyanate, butylene-1,2-diisocyanate, ethylene diisocyanate, cyclopentylene-1,3-diisocyanate, cyclohexylene-1,3-diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, 4,4′-diphenyl diisocyanate, 1,5-napthalene diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, toluene trisisocyanate, 1,4-xylene diisocyanate, and 4,4′-diphenylmethane diisocyanate; and (b) a caprolactam-blocked polyisocyanate prepolymer derived from the condensation of a polyhydric alcohol and one or more of the polyisocyanates in (a).