Radiation curable release coatings

The method of making an adhesive or transfer design laminate comprising a release layer in dry-stripping removable contact with said adhesive or transfer design, said method comprising forming as said release layer a liquid film of radiation polymerizable material, said liquid containing an effective amount of a release material having low adhesion to said adhesive or transfer design and being of limited compatibility in said liquid such that a thin layer thereof migrates to the surface of said film, curing said film to a flexible solid layer by irradiation, and applying said adhesive or transfer design to the surface of said cured film, said release material comprising cyclododecane or stearyl acrylate.

The method of making an adhesive or transfer design laminate comprising a release layer in dry-stripping removable contact with said adhesive or transfer design, said method comprising forming as said release layer a liquid film of radiation polymerizable material, said liquid containing an effective amount of a release material having low adhesion to said adhesive or transfer design and being of limited compatibility in said liquid such that a thin layer thereof migrates to the surface of said film, curing said film to a flexible solid layer by irradiation, and applying said adhesive or transfer design to the surface of said cured film, said liquid film also containing as reinforcing agent an essentially linear polymer soluble therein, said polymer having a molecular weight of at least about 4000.

The method of making an adhesive or transfer design laminate comprising a release layer in dry-stripping removable contact with said adhesive or transfer design, said method comprising forming as said release layer a liquid film of radiation polymerizable material, said liquid containing an effective amount of a release material having low adhesion to said adhesive or transfer design and being of limited compatibility in said liquid such that a thin layer thereof migrates to the surface of said film, curing said film to a flexible solid layer by irradiation without substantial evaporation of solvent, and applying said adhesive or transfer design to the surface of said cured film, said liquid film comprising a prepolymer which is the stepwise reaction product of (a) substantially 3 mols of a polyisocyanate with (b) substantially 1 mol of a polyether triol and (c) an unsaturated alcohol selected from allyl alcohol, 5-norbornene-2-methanol and hydroxy lower esters of acrylic or methacrylic acid, and sufficient acrylate ester monomer copolymerizable by radiation with said prepolymer to provide coating viscosity, said monomer including at least one monomer having three or more unsaturated acrylate or methacrylate groups to promote cross-linking of said layer, and wherein said film is curable within about one second or less.

The method of making an adhesive or transfer design laminate comprising a release layer in dry-stripping removable contact with said adhesive or transfer design, said method comprising forming as said release layer a liquid film of radiation polymerizable material, said liquid containing an effective amount of a release material having low adhesion to said adhesive or transfer design and being of limited compatibility in said liquid such that a thin layer thereof migrates to the surface of said film, curing said film to a flexible solid layer by irradiation, and applying said adhesive or transfer design to the surface of said cured film, said liquid comprising a prepolymer dissolved in one or more vinyl monomers, said prepolymer comprising the residue formed by reacting a polyamine with an ethylenically unsaturated dibasic carboxylic acid or lower alkyl ester or anhydrides thereof.

A laminate comprising an adhesive or transfer design layer in dry-stripping removable contact with a release surface, said surface being the surface of a radiation cured polymer composition, said polymer composition including from about 0.1% to about 10% by weight of a release material having low adhesion to said adhesive or transfer design layer and which has migrated to said surface to provide release properties thereon, the concentration of said release material in said polymer composition being substantially greater at said release surface than in the remainder of said polymer composition, said polymer composition being cross-linked.

A laminate comprising an adhesive or transfer design layer in dry-stripping removable contact with a release surface, said surface being the surface of a radiation cured polymer composition, said polymer composition including from about 0.1% to about 10% by weight of a release material having low adhesion to said adhesive or transfer design layer and which has migrated on said surface to provide release properties thereon, the concentration of said release material being greater at said surface than throughout the body of said polymer composition, said radiation cured polymer composition being the polymerization product of a liquid prepolymer and sufficient acrylate ester monomer copolymerizable with said prepolymer to provide coating viscosity, said prepolymer being the stepwise reaction product of (a) substantially three mols of a polyisocyanate with (b) substantially one mol of a polyether triol and (c) an unsaturated alcohol selected from allyl alcohol, 5-norbornene-2-methanol and hydroxy lower esters of acrylic or methacrylic acid;

• said monomer including at least one monomer having three or more unsaturated acrylate or methacrylate groups to promote cross-linking of said layer;
• said composition being curable within about one second or less.