Polyester process
First Claim
1. A process for the preparation of an unsaturated polyester which comprises (i) reacting an organic diol with a cyclic alkylene carbonate in the presence of a first catalyst of an alkali carbonate to thereby form a polyalkoxy diol, and (ii) adding thereto a further amount of cyclic alkylene carbonate in the presence of a second catalyst of an alkali alkoxide, and (iii) subsequently polycondensing the resulting mixture with a dicarboxylic acid.
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Abstract
A process for the preparation of an unsaturated polyester which comprises (i) reacting an organic diol with a cyclic akylene carbonate in the presence of a first catalyst to thereby form a polyalkoxy diol, and (ii) optionally adding thereto a further amount of cyclic alkylene carbonate in the presence of a second catalyst, and (iii) subsequently polycondensing the resulting mixture with a dicarboxylic acid.
268 Citations
52 Claims
- 1. A process for the preparation of an unsaturated polyester which comprises (i) reacting an organic diol with a cyclic alkylene carbonate in the presence of a first catalyst of an alkali carbonate to thereby form a polyalkoxy diol, and (ii) adding thereto a further amount of cyclic alkylene carbonate in the presence of a second catalyst of an alkali alkoxide, and (iii) subsequently polycondensing the resulting mixture with a dicarboxylic acid.
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42. A process for the preparation of crosslinked polyesters obtained from the reactive extrusion of a peroxide and an unsaturated polyester resin, and which resin is generated by (i) reacting an organic diol with a cyclic alkylene carbonate in the presence of a first catalyst to thereby form a polyalkoxy diol;
- (ii) adding thereto a further amount of cyclic alkylene carbonate in the presence of a second catalyst; and
(iii) subsequently polycondensing the resulting mixture with a dicarboxylic acid, and wherein said first catalyst is an alkali carbonate, and wherein said second catalyst is an alkali alkoxide.
- (ii) adding thereto a further amount of cyclic alkylene carbonate in the presence of a second catalyst; and
- 49. A process for the preparation of an unsaturated polyester which consists essentially of (i) reacting an organic diol with a cyclic alkylene carbonate in the presence of a first catalyst to thereby form a polyalkoxy diol, and (ii) adding thereto a further amount of said cyclic alkylene carbonate in the presence of a second catalyst, and (iii) subsequently polycondensing the resulting mixture with a dicarboxylic acid.
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50. A process for the preparation of an unsaturated polyester which comprises reacting an organic diol in an amount of from about 0.95 to about 1.05 mole equivalents with a cyclic alkylene carbonate in an amount of from about 1.95 to about 2.05 mole equivalents, in the presence of a first alkali carbonate catalyst in an amount of from about 0.001 to about 0.1 mole equivalents, to thereby form a polyalkoxy diol, and wherein the polyalkoxy diol is comprised of isomers with from about 2 to about 5 weight percent of isomer I, from about 95 to about 99 weight percent of isomer II, and from about 0 to about 3 weight percent of isomer III, and the sum of I, II, and III is about 100 percent and wherein said isomers are of the following formulas ##STR13## and followed by subsequently polycondensing the resulting polyalkoxy diol with said dicarboxylic acid in an amount of from about 0.95 to about 1.05 mole equivalents, wherein R is an aromatic component, R'"'"' is hydrogen or alkyl, and a is zero, 1, or 2, or a mixture of zero, 1, and 2, and wherein the reaction with the cyclic alkylene carbonate is accomplished in the presence of an alkali alkoxide catalyst.
Specification