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US 4,307,060 AGranted
Thermoplastic polyesters, and method of making hollow articles therefrom
AssigneeOwens-Illinois, Inc.
InventorSanto W. Go
Life of this patent
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Abstract
Disclosed are new copolyesters of terephthalic acid, bis(4-.beta.-hydroxyethyoxyphenyl)sulfone, ethylene glycol and a very small amount of a trifunctional cross-linking agent, particularly useful as molding compounds, especially for the extrusion-blow molding process of making hollow articles, and a method of making hollow articles.
Claims12
A thermoplastic copolyester consisting essentially of the polymeric reaction of:
- (A) reactant(s) selected from terephthalic acid and its C.sub.1 to C.sub.4 alkyl esters, and
- (B) reactants, bis (4-beta-hydroxyethoxyphenyl) sulfone and ethylene glycol, and
- (C) reactant(s) selected from (a) a triol of the formula RC(CH.sub.2 OH).sub.3 where R is methyl or ethyl and (b) trimesic acid, its anhydride, and its C.sub.1 to C.sub.4 alkyl esters,
- wherein the amount of said bis (4-beta-hydroxyethoxyphenyl) sulfone is 2-25 mol percent of the amount A of reactant(s), the combined amount of B reactants is about 110 to 300 mol percent of the amount of A reactant(s), and the amount of C reactant(s) is 0.1 to 0.7 mol percent of said A reactants,
- said copolyester having oxygen (O.sub.2) and CO.sub.2 permeabilities in cc.mil/100 in..sup.2.day.atm. of less than 9 and less than 62, respectively, a glass transistion temperature, Tg, of at least 82.degree. on an unoriented basis, said copolyester further having non-Newtonian flow properties.
2 more elements
Dependencies are inferred from the claim text.