Radiant energy curable polyester resin composition
First Claim
1. A liquid, photo radiation curable, unsaturated, polyester resin composition of improved physical and chemical properties, which composition comprises:
- a) an unsaturated polyester resin containing ethylenic unsaturation and prepared by the reaction of a dicarboxylic acid and a dihydroxy alcohol;
b) a styrene monomer in an amount of less than about 40% by weight of the composition;
c) a liquid acrylic-urethane prepolymer as a diluent additive, the prepolymer prepared by the reaction of the NCO groups of a polyisocyanate or a polyisocyanate prepolymer in a stoichiometric or slight excess amount with a hydroxy-functional polyacrylate monomer;
d) an inhibitor in an amount to retard the premature reaction of the prepolymer and the styrene monomer;
e) a photoinitiator in an amount to promote the radiation polymerization of the unsaturated resin composition on exposure to radiation.
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Abstract
An acrylic urethane prepolymer composition and an unsaturated polyester resin composition to which the prepolymer has been added. The prepolymer composition includes an acrylic urethane prepolymer prepared by the reaction of diisocyanate, such as MDI, with an hydroxyl-containing acrylate monomer, such as a pentaerythritol triacrylate. The prepolymer composition contains a styrene monomer and an inhibitor, such as benzoquinone, to retard the reaction of the prepolymer and styrene monomer prior to the addition of the prepolymer composition into the polyester resin composition and a photoinitiator to promote the polymerization of the resin by exposure to radiant energy. The employment of the urethane prepolymer composition provides for the reduction in the amount of styrene monomer used in the unsaturated resin composition and also provides for improved chemical and physical properties of the photocured, unsaturated resin composition.
24 Citations
28 Claims
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1. A liquid, photo radiation curable, unsaturated, polyester resin composition of improved physical and chemical properties, which composition comprises:
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a) an unsaturated polyester resin containing ethylenic unsaturation and prepared by the reaction of a dicarboxylic acid and a dihydroxy alcohol; b) a styrene monomer in an amount of less than about 40% by weight of the composition; c) a liquid acrylic-urethane prepolymer as a diluent additive, the prepolymer prepared by the reaction of the NCO groups of a polyisocyanate or a polyisocyanate prepolymer in a stoichiometric or slight excess amount with a hydroxy-functional polyacrylate monomer; d) an inhibitor in an amount to retard the premature reaction of the prepolymer and the styrene monomer; e) a photoinitiator in an amount to promote the radiation polymerization of the unsaturated resin composition on exposure to radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A liquid, photo radiation curable, unsaturated, polyester resin composition which comprises:
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a) an unsaturated polyester resin containing ethylenic unsaturation and prepared by the reaction of a dicarboxylic acid and a dihydroxy alcohol; b) a styrene monomer in an amount of from 5% to about 40% by weight of the composition; c) from about 5% to 30% by weight of the composition as a diluent additive of a liquid acrylic-urethane prepolymer prepared by the reaction of the NCO groups of methylene di-para-phenylene isocyanate or methylene di-paraphenylene isocyanate prepolymer, with a pentaerythritol polyacrylate; d) an inhibitor in an amount to retard the premature reaction of the prepolymer and the styrene monomer; e) a photoinitiator in an amount to promote the radiation polymerization of the unsaturated resin composition on exposure to radiation. - View Dependent Claims (26, 27, 28)
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Specification