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US 7,396,896 B2Granted
Poly(trimethylene terephthalate) composition and shaped articles prepared therefrom
AssigneeE.I. duPont de Nemours and Company
InventorJoseph V. Kurian
Life of this patent
Estimating the term…
Abstract
Poly(trimethylene dicarboxylate) prepared by polycondensation of: (a) 1,3-propanediol; (b) aliphatic or aromatic diacid or diester; and (c) from about 0.01 to about 0.2 mole %, based on the total number of moles of 1,3-propanediol and diacid or ester, of polyfunctional reactant containing three or more carboxylic acid type groups or hydroxy groups. Shaped articles, including bottles, are made from the poly(trimethylene dicarboxylate).
Claims33
A poly(trimethylene dicarboxylate) prepared by polycondensation of:
- (a) a glycol component comprising 1,3-propanediol;
- (b) aliphatic or aromatic diacid or diester;
- and (c) from about 0.01 to about 0.2 mole %, based on the total number of moles of said glycol component and diacid or ester, of polyfunctional reactant containing three or more carboxylic acid type groups or hydroxy groups;
- wherein comonomers in the glycol component other than 1,3-propanediol are not more than 10% by weight of said glycol component;
- wherein said poly(trimethylene dicarboxylate) further comprises comonomer repeat units derived from the group consisting of ethylene glycol, 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propane diol, and C6-C12 diols;
- and
- wherein said polyfunctional reactant is not pyromellitic dianhydride.
4 more elements
Dependencies are inferred from the claim text.