Interpenetrating dual cure resin compositions
AssigneeGeneral Mills Chemicals, Inc.
InventorsEarl Skinner, Marvin Emeott, Allan Jevne
Life of this patent
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Abstract
Curable resin compositions are prepared containing a radiation-sensitive reactive diluent and a saturated polyol. Curing is accomplished by mixing the reactive diluent and the polyol with a polyisocyanate, followed by exposure of the resultant composition to radiation to polymerize the reactive diluent and then, by thermal curing, to form the hydroxyisocyanate (urethane) linkage. The fully cured resin composition is described as interpenetrated or one in which there is no cross-linking between the reactive diluent and urethane linked co-polymer. The interpenetrated resin compositions form tough and hard coatings on various substrates.
Claims12
An interpenetrating radiation-sensitive resin composition comprising:
- (a) from about 40% to about 90% by weight of a saturated polyol which is a hydroxy functional acrylic copolymer of:
- (1) methyl methacrylate;
- (2) butyl acrylate, and
- (3) hydroxyethyl acrylate and,
- (b) from about 10% to about 60% by weight of a reactive diluent having a radiation sensitive pi bond and having a boiling point greater than that of benzene, and mixtures thereof said reactive diluent being a fully substituted polyacrylate or polymethacrylate of a polyfunctional alcohol.
An interpenetrating urethane-linking, radiation-sensitive resin composition comprising:
- (a) from about 40% to about 90% by weight of a saturated polyol which is a hydroxy functional acrylic copolymer of:
- (1) methyl methacrylate;
- (2) butyl acrylate, and
- (3) hydroxyethyl acrylate and,
- (b) from about 10% to about 60% by weight of a reactive diluent selected from the group consisting of the fully substituted polyacrylates and polymethacrylates of poly-functional alcohols, 2-ethylhexylacrylate, isodecylacrylate, diallyl maleate, styrene, divinylbenzene, vinyl acetate, and N-vinyl-2-pyrrolidone, and mixtures thereof;
- and,
- (c) from about 80% to about 120% on a hydroxylisocyanate equivalent basis of a polyisocyanate.
Dependencies are inferred from the claim text.