Sheet or web type materials with a markable adhesive-repellent coating, and a process for their manufacture

Claim 2

A self-adhesive web or sheet material, which comprises a flexible substrate coated on at least one side with a markable adhesive-repellent coating said coating having been produced by heating a solvent-containing mixture consisting essentially of an organic solvent, 44 to 84 parts wt. of (a) a non-reactive, organic solvent-soluble, linear polyurethane resin or (b) a polyurethane resin containing hydroxypolyester groups, having a hydroxyl content of about 0.1%, 1 to 16 parts by wt. of an aliphatic trifunctional isocyanate containing terminal isocyanate groups, 1 to 14 parts by wt. of glycerin, 0 to 40 parts by wt. of a micro-fine siliceous matting agent, 0 to 1 part by wt. of an organic tin ester catalyst.

Claim 3

Sheet or web type materials according to claim 1 wherein the polyurethane resin containing hydroxypolyester group has a mean molecular weight of 150,000 to 200,000.

Claim 4

Sheet or web type materials according to claim 1 wherein the trifunctional isocyanate is biuret of hexamethylene diisocyanate.

Claim 5

Sheet or web type materials according to claim 1 wherein the aliphatic trifunctional isocyanate has an isocyanate content of about 17%.

Claim 6

Sheet or web type materials according to claim 1 wherein the matting agent consists of approximately equal parts of highly dispersed silicon dioxide and talc having a particle size of 0.1-15 microns.

Claim 7

Sheet or web type materials according to claim 1 wherein the matting agent consists of equal parts of silicon dioxide and magnesium silicate.

Claim 8

Sheet or web type materials according to claim 1 wherein polyvinyl chloride is used as support.

Claim 9

Sheet or web type self-adhesive materials according to claim 1 wherein the self-adhesive materials are coated with strongly adhesive acrylate adhesive compositions.

Claim 10

Sheet or web type self-adhesive materials according to claim 1 wherein the organic solvent is at least one compound selected from the group consisting of esters, ketones, aromatics and alcohols.

Claim 11

A process for the manufacture of sheet or web type self-adhesive materials coated on at least one side of a flexible substrate with a markable adhesive-repellent coating, said adhesive-repellent coating being applied in the form of a solvent-containing mixture consisting essentially of an organic solvent, 44 to 84 parts by wt. of (a) a non-reactive, organic solvent-soluble, linear polyurethane resin or (b) a polyurethane resin containing hydroxypolyester groups having a hydroxyl content of about 0.1%, 1 to 16 parts by wt. of an aliphatic trifunctional isocyanate containing terminal isocyanate groups, 1 to 14 parts by wt. of glycerin, 0 to 40 parts by wt. of a micro-fine siliceous matting agent, 0 to 1 part by wt. of an organic tin ester catalyst, comprising the steps of applying a thin layer of said solvent-containing mixture on a support, drying said support, heating said support whereby said adhesive-repellent coating is formed by the reaction of the components of said solvent-containing mixture.

Claim 12

A process for the manufacture of sheet or web type self-adhesive materials coated on at least one side of a flexible substrate with a markable adhesive-repellent coating, said adhesive-repellent coating being applied in the form of a solvent-containing mixture consisting essentially of an organic solvent, 44 to 84 parts by wt. of (a) a non-reactive, organic solvent-soluble, linear polyurethane resin or (b) a polyurethane resin containing hydroxypolyester groups having a hydroxyl content of about 0.1%, 1 to 16 parts by wt. of an aliphatic trifunctional isocyanate containing terminal isocyanate groups, 1 to 14 parts by wt. of glycerin, 0 to 40 parts by wt. of a micro-fine siliceous matting agent, 0 to 1 part by wt. of an organic tin ester catalyst, comprising the steps of applying a thin layer of said solvent-containing mixture on a support, drying said support, heating said support whereby said adhesive-repellent coating is formed by the reaction of the components of said solvent-containing mixture.

Claim 13

A process according to claim 10 wherein the polyurethane resin contains hydroxypolyester groups has a mean molecular weight of 150,000 to 200,000.

Claim 14

A process according to claim 10 wherein the trifunctional isocyanate is the biuret of hexamethylene diisocyanate.

Claim 15

A process according to claim 10 wherein the aliphatic trifunctional isocyanate has an isocyanate content of about 17%.

Claim 16

A process according to claim 10 wherein the matting agent consists of approximately equal parts of highly dispersed silicon dioxide and talc having a particle size of 0.1-15 microns.

Claim 17

A process according to claim 10 wherein the matting agent consists of equal parts of silicon dioxide and magnesium silicate.

Claim 18

A process according to claim 10 wherein the heat treatment occurs at temperatures above 60° C. for 0.1-1 minute.

Claim 19

A process according to claim 10 wherein the heat treatment occurs at temperatures between 80° and 90° C. for 15 seconds.

Claim 20

A process according to claim 10, characterized in that polyvinyl chloride is used as support.

Claim 21

A process according to claim 10 wherein the self-adhesive materials are coated with highly adhesive acrylate adhesive compositions.

Claim 22

A process according to claim 10 wherein the organic solvent is at least one compound selected from the group consisting of esters, ketones, aromatics and alcohols.