Process for the shatterproof coating of glass surfaces

Claim 2

A process for coating glass surfaces to render them shatterproof which comprises (a) applying a physically drying priming lacquer which comprises (i) a silane adhesion promoter, (ii) a polyurethane polyurea binder which has a linear molecular structure and which is soluble in lacquer solvents, (iii) at least one catalyst which accelerates the isocyanate-addition reaction, and (iv) at least one solvent, (b) drying the priming lacquer, (c) coating the dried priming lacquer with a solvent-free or substantially solvent-free coating composition containing a two-component polyurethane binder comprising an isocyanate-reactive component and an isocyanate-containing component, and (d) reacting the two-component polyurethane binder to harden the coating composition.

Claim 3

The process of claim 1 wherein the polyurethane polyurea binder is used in a quantity of about 5 to 25% by weight, based on the weight of the priming lacquer.

Claim 4

The process of claim 1 or 2 wherein the catalyst component(a)(iii) is used in a quantity of about 0.2 to 2% by weight, based on the weight of the priming lacquer.

Claim 5

The process of claim 1 or 2 wherein the silane adhesion promoter is used in a quantity of about 0.2 to 3% by weight, based on the weight of the priming lacquer.

Claim 6

The process of claim 1 or 2 wherein the polyurethane polyurea binder is prepared from components comprising an aliphatic or cycloaliphatic diisocyanate, a polyester diol having a molecular weight of about 1000 to 2500, and an aliphatic or cycloaliphatic diprimary diamine.

Claim 7

The process of claim 5 wherein said diisocyanate comprises a member selected from the group consisting of 4,4'-diisocyanato-dicyclohexyl methane and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane.

Claim 8

The process of claim 5 wherein said diprimary diamine is 1-amino-3,3,5-trimethyl-5-aminomethyl cyclohexane.

Claim 9

The process of claim 1 or 2 wherein said isocyanate-reactive component comprises a polyether polyol or polyester polyol.

Claim 10

The process of claim 1 or 2 wherein said isocyanate-containing component contains aliphatically-bound and/or cycloaliphatically-bound isocyanate groups.

Claim 11

The process of claim 1 or 2 wherein said coating composition does not contain a catalyst for the isocyanate-addition reaction.

Claim 12

A process for coating glass surfaces to render them shatterproof which comprises (a) applying a physically drying priming lacquer which comprises based on the total weight of the priming lacquer (i) about 0.2 to 3% by weight of a silane adhesion promoter, (ii) about 5 to 25% by weight of a polyurethane polyurea binder which has a linear molecular structure, is soluble in lacquer solvents and is based on at least one aliphatic or cycloaliphatic diisocyanate, at least one polyester diol having a molecular weight of about 1000 to 2500 and at least one aliphatic or cycloaliphatic diprimary diamine, (iii) about 0.2 to 2% by weight of a catalyst which accelerates the isocyanate-addition reaction, and (iv) at least one solvent, (b) drying the priming lacquer, (c) coating the dried priming lacquer with a solvent-free or substantially solvent-free coating composition containing a two-component polyurethane binder comprising an isocyanate-reactive component containing a polyether polyol or polyester polyol and an isocyanante-containing component having aliphatically-bound and/or cycloaliphatically-bound isocyanate groups and which does not contain a catalyst for the isocyanate-addition reaction, and (d) reacting the two-component polyurethane binder to harden the coating composition.

Claim 13

A process for coating glass surfaces to render them shatterproof which comprises (a) applying a physically drying priming lacquer which comprises based on the total weight of the priming lacquer (i) about 0.2 to 3% by weight of a silane adhesion promoter, (ii) about 5 to 25% by weight of a polyurethane polyurea binder which has a linear molecular structure, is soluble in lacquer solvents and is based on at least one aliphatic or cycloaliphatic diisocyanate, at least one polyester diol having a molecular weight of about 1000 to 2500 and at least one aliphatic or cycloaliphatic diprimary diamine, (iii) about 0.2 to 2% by weight of a catalyst which accelerates the isocyanate-addition reaction, and (iv) at least one solvent, (b) drying the priming lacquer, (c) coating the dried priming lacquer with a solvent-free or substantially solvent-free coating composition containing a two-component polyurethane binder comprising an isocyanate-reactive component containing a polyether polyol or polyester polyol and an isocyanante-containing component having aliphatically-bound and/or cycloaliphatically-bound isocyanate groups and which does not contain a catalyst for the isocyanate-addition reaction, and (d) reacting the two-component polyurethane binder to harden the coating composition.

Claim 14

The process of claim 11 wherein said diisocyanate comprises a member selected from the group consisting of 4,4'-diisocyanato-dicyclohexyl methane and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane.

Claim 15

The process of claim 11 wherein said diprimary diamine is 1-amino-3,3,5-trimethyl-5-aminomethyl cyclohexane.