초록 ▼

The invention relates to a process for the production of coatings using a coating composition containing as binder optionally blocked lacquer-grade polyisocyanates in combination with polyhydroxy polyacrylate resins based on copolymers of certain hydroxy alkyl(meth)acrylates, methyl methacrylate, 2-

The invention relates to a process for the production of coatings using a coating composition containing as binder optionally blocked lacquer-grade polyisocyanates in combination with polyhydroxy polyacrylate resins based on copolymers of certain hydroxy alkyl(meth)acrylates, methyl methacrylate, 2-ethylhexyl acrylate and, optionally, (meth)acrylic acid, wherein the molecular weight is in the range from about 30,000 to 80,000, the content of low molecular weight constituents having molecular weights of at most about 3000 amounts to between 3 and 15% by weight, the molecular heterogeneity factor amounts to between about 1.0 and 10.0, and the parameter for the chemical heterogeneity of the copolymer is between 0 and about 0.06.

대표청구항 ▼

A process for the production of a coated substrate which comprises (A) coating said substrate with a coating composition which contains as binder a mixture comprising (a) a lacquer-grade polyisocyanate-containing biuret, urethane or isocyanurate groups and (b) a polyhydroxy polyacrylate resin based

A process for the production of a coated substrate which comprises (A) coating said substrate with a coating composition which contains as binder a mixture comprising (a) a lacquer-grade polyisocyanate-containing biuret, urethane or isocyanurate groups and (b) a polyhydroxy polyacrylate resin based on a copolymer comprising (i) about 10 to 20 parts by weight of 2-hydroxyethyl(meth)-acrylate, 2- or 3-hydroxypropyl(meth)acrylate and/or hydroxybutyl(meth)acrylate, (ii) about 55 to 80 parts by weight of methyl methacrylate, (iii) about 8 to 30 parts by weight of 2-ethylhexyl acrylate and (iv) up to about 2 parts by weight of (meth)acrylic acid, wherein the polyhydroxy acrylate resin is further characterized by (1) an average molecular weight as determined by gel permeation chromatography, MGPC, of about 30,000 to 80,000, (2) about 3 to 15% by weight, based on the total weight of the copolymer, of low molecular weight constituents having molecular weights of at most about 3,000, (3) a molecular heterogeneity factor, U=Mw/Mn-1, of between about 1.0 and 10.0, and (4) a chemical heterogeneity parameter d0 and about 0.06, and (B) hardening the coating composition to form a polyurethane coated substrate.