High solids polyurethane polyols and coating compositions thereof
AssigneePPG Industries, Inc.
InventorsRonald R. Ambrose, Wen-Hsuan Chang, David T. McKeough, John R. Peffer
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Abstract
There are disclosed herein polyurethane polyols and coating compositions formulated therewith. The polyurethane polyols are prepared by typically reacting low molecular weight polyols in amounts sufficient to produce reaction products containing a significant amount of unreacted starting polyols which can be subsequently removed by means such as vacuum distillation.
Claims20
A polyurethane polyol having a number average molecular weight of up to about 1000 which is prepared by reacting a low molecular weight starting polyol with a polyisocyanate, wherein the starting polyol is in an amount sufficient to produce a reaction product containing about 5 percent or higher unreacted starting polyol.
A polyurethane polyol having an average number molecular wweight of up to about 1000 which is prepared by reacting:
- (a) a glycol with
- (b) a diisocyanate;
- the mole ratio of the glycol to the diisocyanate is about 1.5 to 15:1, wherein the reaction is carried essentially to completion.
A polyurethane polyol having a number average molecular weight of up to about 1000 which is prepared by:
- (1) reacting a low molecular weight starting polyol with a polyisocyanate, wherein the starting polyol is in an amount sufficient to produce a reaction product containing about 5 percent or higher of unreacted starting polyol;
- said reaction is followed by
- (2) removing about 30 percent or higher of the unreacted starting polyol, under essentially non-reacting conditions.
A polyurethane polyol having an average number molecular weight of up to about 1000 which is prepared by:
- (1) reacting:
- (a) a glycol with
- (b) a diisocyanate;
- wherein the glycol is in an amount sufficient to produce a reaction product containing about 5 percent of higher unreacted glycol;
- followed by
- (2) removing about 30 percent or higher of the unreacted glycol, under essentially non-reacting conditions.
Dependencies are inferred from the claim text.