High solids polyester polyols and resinous polyols thereof
AssigneePPG Industries, Inc.
InventorsRonald R. Ambrose, Wen-Hsuan Chang, David T. McKeough, John R. Peffer
Life of this patent
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Abstract
There are disclosed herein polyester polyols, resinous polyols thereof, and coating compositions formulated therewith. The polyester polyols are prepared by typically reacting a large excess of low molecular weight polyols with polycarboxylic acid or functional equivalents thereof. The polyols are employed in amounts sufficient to produce reaction products containing a significant amount of unreacted polyols which can be subsequently removed by means such as vacuum distillation.
Claims18
A polyester 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 polycarboxylic acid or a functional equivalent thereof, wherein the starting polyol is in an amount sufficient to produce a reaction product containing about 16 percent or higher of unreacted starting polyol.
A polyester polyol having a number average molecular weight of up to about 1000 which is prepared by reacting:
- (a) a glycol with
- (b) a dicarboxylic acid, an anhydride or a lower alkyl ester thereof;
- the mole ratio of the glycol to the dicarboxylic acid, an anhydride or a lower alkyl ester thereof is about 2.3 to 15:1, wherein the reaction is carried essentially to completion.
A polyester 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 polycarboxylic acid or a functional equivalent thereof, 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 by weight of the unreacted starting polyol, under essentially non-reacting conditions.
A polyester polyol having a number average molecular weight of up to about 1000 which is prepared by:
- (1) reacting:
- (a) a glycol with
- (b) a dicarboxylic acid, a lower alkyl ester or an anhydride thereof;
- the mole ratio of the glycol to the dicarboxylic acid is 1.5 to 15:1;
- followed by
- (2) removing about 30 percent by weight of the unreacted glycol, under essentially non-reacting conditions.
A polyester-urethane polyol which is prepared by reacting a polyester polyol with a polyisocyanate;
- the polyester polyol is formed by:
- (1) reacting a glycol with a dicarboxylic acid, an anhydride or a lower alkyl ester thereof, wherein the glycol is in an amount sufficient to produce a reaction product containing about 5 percent or higher of unreacted glycol;
- followed by
- (2) removing at least about 30 percent by weight of the unreacted glycol under essentially non-reacting conditions.
Dependencies are inferred from the claim text.