Polyester process
AssigneeXerox Corporation
InventorsGuerino G. Sacripante, Daniel A. Foucher, J. Stephen Kittelberger, Dongming Li, Marko D. Saban, Alan E. J. Toth, Robert D. Bayley
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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.
Claims52
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.
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.
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.
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.
Dependencies are inferred from the claim text.