UV Curable composition and coil coatings

Claim 1

A UV curable coating composition comprising (A) about 20 to about 40% by weight of an acrylated epoxy which comprises the reaction product of about 2 equiv. of an epoxy resin having an E.E.W. of about 1500 to about 5000, and about 0.9 to about 1.1 equiv. of a compound selected from the group consisting of (1) an anhydride acrylate adduct where said anhydride acrylate adduct has a functionality of 1 except in the case of trimellitic anhydride where said adduct has a functionality of 2 where said anhydride acrylate adduct comprises the reaction product of (a) an acrylate selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and mixtures thereof; and (b) 1 mole, ±10 mole %, per mole of said acrylate of an anhydride selected from the group consisting of phthalic anhydride, maleic anhydride, trimellitic anhydride, and mixtures thereof; (2) an isocyanate which comprises the reaction product of (a) 1 mole of an acrylate selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and mixtures thereof; and (b) 1 mole of toluene diisocyanate, 4,4'-diisocyanato diphenyl methane, and mixtures thereof; and (3) mixtures of (1) and (2) (B) about 4 to about 15% by weight of an acrylated blocked isocyanate which comprises the reaction product of 1 mole caprolactam and 1 mole of an isocyanate adduct which comprises the reaction product of (1) 1 mole of an acrylate selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate and mixtures thereof; and (2) about 0.99 to about 1.01 mole of a compound selected from the group consisting of toluene diisocyanate, 4,4'-diisocyanato diphenyl methane, and mixtures thereof; (C) about 4.5 to about 65% by weight of a monoacrylate, of which at least 60% by weight is phenoxyethyl acrylate; (D) about 5 to about 20% by weight of a polyacrylate, of which at least about 50% is tetraethylene glycol diacrylate; (E) about 2 to about 5% by weight of a photo-initiator; (F) about 0.05 to about 0.3% by weight inhibitor; and (G) up to about 30% of a compound selected from the group consisting of acrylated hexamethoxymethylmelamine, acrylated urethane, and mixture thereof.

Claim 11

A method of preparing a UV curable composition comprising (1) forming an acrylate adduct by reacting, in the presence of a monoacrylate and an inhibitor, an acrylate selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and mixtures thereof, with a compound selected from the group consisting of (a) 1 mole, ±10 mole %, per mole of said acrylate, of a compound selected from the group consisting of phthalic anhydride, maleic anhydride, trimellitic anhydride, and mixtures thereof (b) 1 mole, ±1 mole %, per mole of said acrylate, of a compound selected from the group consisting of toluene diisocyanate, 4,4'-diisocyanato dispheyl methane, and mixtures thereof; and (c) mixture of (a) and (b); (2) forming an acrylated epoxy by reacting said acrylate adduct with an epoxy resin having an E.E.W. of about 1500 to about 5000 in the presence of a monoacrylate and an inhibitor; (3) forming an acrylated isocyanate by reacting an acrylate selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and mixtures thereof, with 1 mole, ±1 mole %, per mole of said acrylate, of a compound selected from the group consisting of toluene diisocyanate, 4,4'-diisocyanato diphenyl methane, and mixtures thereof, in the presence of a monoacrylate and an inhibitor; (4) forming an acrylated blocked isocyanate by reacting caprolactam with 1 mole, ±1 mole %, per mole of said caprolactam, of said acrylated isocyanate; (5) forming a blend of (a) about 20 to about 40% by weight of said acrylated epoxy; (b) about 4 to about 15% by weight of said acrylated blocked isocyanate; (c) about 45 to about 65% by weight of said monoacrylate, of which at least 60% by weight is phenoxyethyl acrylate; (d) about 5 to about 20% by weight of a polyacrylate, of which at least about 50% is tetraethylene glycol diacrylate; (e) about 2 to about 5% of a photoinitiator; and (f) about 0.05 to about 0.3% by weight inhibitor.

Claim 12

A method of preparing a UV curable composition comprising (1) forming an acrylate adduct by reacting, in the presence of a monoacrylate and an inhibitor, an acrylate selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and mixtures thereof, with a compound selected from the group consisting of (a) 1 mole, ±10 mole %, per mole of said acrylate, of a compound selected from the group consisting of phthalic anhydride, maleic anhydride, trimellitic anhydride, and mixtures thereof (b) 1 mole, ±1 mole %, per mole of said acrylate, of a compound selected from the group consisting of toluene diisocyanate, 4,4'-diisocyanato dispheyl methane, and mixtures thereof; and (c) mixture of (a) and (b); (2) forming an acrylated epoxy by reacting said acrylate adduct with an epoxy resin having an E.E.W. of about 1500 to about 5000 in the presence of a monoacrylate and an inhibitor; (3) forming an acrylated isocyanate by reacting an acrylate selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and mixtures thereof, with 1 mole, ±1 mole %, per mole of said acrylate, of a compound selected from the group consisting of toluene diisocyanate, 4,4'-diisocyanato diphenyl methane, and mixtures thereof, in the presence of a monoacrylate and an inhibitor; (4) forming an acrylated blocked isocyanate by reacting caprolactam with 1 mole, ±1 mole %, per mole of said caprolactam, of said acrylated isocyanate; (5) forming a blend of (a) about 20 to about 40% by weight of said acrylated epoxy; (b) about 4 to about 15% by weight of said acrylated blocked isocyanate; (c) about 45 to about 65% by weight of said monoacrylate, of which at least 60% by weight is phenoxyethyl acrylate; (d) about 5 to about 20% by weight of a polyacrylate, of which at least about 50% is tetraethylene glycol diacrylate; (e) about 2 to about 5% of a photoinitiator; and (f) about 0.05 to about 0.3% by weight inhibitor.