Distortion control additives for ultraviolet-curable compositions
First Claim
1. A liquid composition comprising the reaction product of:
- (a) from about 1 to 10 weight percent of a polyisocyanate;
(b) from about 35 to 50 weight percent of a polyol or polyol blend having a hydroxyl functionality of 2 to 3 hydroxyl groups per molecule and an average molecular weight of about 500 to 10,000 grams per gram mole; and
(c) from about 0.2 to 6.0 weight percent of a diol chain extender having from about 2 to 32 carbon atoms per molecule;
said composition further comprising(d) from about 40 to 60 weight percent of an acrylate or methacrylate having an acrylate functionality of from 2 to 5 acrylate groups per molecules;
wherein the reaction of (a), (b) and (c) occurs in the presence of (d).
0 Assignments
0 Petitions
Accused Products
Abstract
Distortion control additives are disclosed which comprise a polyisocyanate, a polyol or polyol blend having a hydroxyl functionality of 2 to 3 hydroxyl groups per molecule and an average molecular weight of at least about 500 grams per gram mole, a diol chain extender having from about 2 to 35 carbon atoms per molecule and an acrylate or methacrylate having an acrylate functionality of from 1 to 5 acrylate groups per molecule. Ultraviolet-curable liquid compositions comprising an unsaturated polymeric resin, a monomer and the distortion control additives of the present invention are also disclosed. The distortion control additives can provide substantial reductions in distortion, e.g., shrinkage, of objects produced by ultraviolet curing, eg., stereolithography.
-
Citations
11 Claims
-
1. A liquid composition comprising the reaction product of:
-
(a) from about 1 to 10 weight percent of a polyisocyanate; (b) from about 35 to 50 weight percent of a polyol or polyol blend having a hydroxyl functionality of 2 to 3 hydroxyl groups per molecule and an average molecular weight of about 500 to 10,000 grams per gram mole; and (c) from about 0.2 to 6.0 weight percent of a diol chain extender having from about 2 to 32 carbon atoms per molecule; said composition further comprising (d) from about 40 to 60 weight percent of an acrylate or methacrylate having an acrylate functionality of from 2 to 5 acrylate groups per molecules; wherein the reaction of (a), (b) and (c) occurs in the presence of (d). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification