Modified pet polymers and copolymers suitable for extrusion...

Details Modified pet polymers and copolymers suitable for extrusion... Modified pet polymers and copolymers suitable for extrusion...

C - Chemistry, Metallurgy

08

G

402/187

C08G 63/68 (2006.01) C08G 63/20 (2006.01) C08G 63/688 (2006.01)

Patent

CA 1265643

71173-21 ABSTRACT There is disclosed an improved modified polymer suitable for use in making hollow containers by conventional extrusion blow molding. It is a specific type of end-capped and branched polyethylene terephthalate polymer or copolymer. In the improvement, the end-cap comprises the reacted component of a difunctional acid or alkali metal salt of a difunctional acid having the formula: Image wherein: X has a valency of 6 and is selected from sulfur, selenium, and tellurium; M is an alkali metal or hydrogen; and Y is hydrogen or an aliphatic group containing from 1 to 18 carbon atoms. The preferred difunctional acid is m- sulfobenzoic acid. The product typically contains few large gels having diameters greater than 0.1 mm.

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