POLYESTERS FOR COATINGS
First Claim
1. A hydroxyl-functional or a carboxyl-functional polyester comprising moieties of(a) terephthalic acid and/or isophthalic acid,(b) ethylene glycol,(c) a dianhydrohexitol, and of(d) one or more linear chain dicarboxylic acidswherein the polyester has a number average molecular weight, as measured by gel permeation chromatography, of from 400 to 15000 daltons, preferably from 550 to 15000 daltons.
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Accused Products
Abstract
The present invention relates to polyesters that can be prepared from renewable resources and/or recycled materials, to their use and their production process. In particular there are provided hydroxyl-functional or carboxyl-functional polyesters comprising moieties of (e) terephthalic acid and/or isophthalic acid, (f) ethylene glycol, (g) a dianhydrohexitol, and of (h) one or more linear chain dicarboxylic acids; wherein the polyester has a number average molecular weight, as measured by gel permeation chromatography, of from 400 to 15000 daltons, more preferably from 550 to 15000 daltons. Polyesters of the invention can basically be prepared from recycled polyethylene terephthalate and from renewable polyacids and/or polyols. The present invention further provides a process to produce such polyesters via glycolysis of a polyethylene terepthalate and/or a polyethylene isophthalate with a dianhydrohexitol.
22 Citations
16 Claims
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1. A hydroxyl-functional or a carboxyl-functional polyester comprising moieties of
(a) terephthalic acid and/or isophthalic acid, (b) ethylene glycol, (c) a dianhydrohexitol, and of (d) one or more linear chain dicarboxylic acids wherein the polyester has a number average molecular weight, as measured by gel permeation chromatography, of from 400 to 15000 daltons, preferably from 550 to 15000 daltons.
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7. A process to produce a polyester comprising a step of
(1) glycolysis of a polyethylene terephthalate and/or a polyethylene isophthalate with a dianhydrohexitol, followed (2) where needed, by one or more additional steps, wherein a polyester is produced that is hydroxyl-functional or carboxyl-functional, and that has a number average molecular weight, as measured by gel permeation chromatography, of from 400 to 15000 daltons, more preferably 550 to 15000 daltons.
Specification