Polymeric composition

Details Polymeric composition Polymeric composition

1987-11-24

1989-08-22

Short, Patricia

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 92, 525176, 525177, C08L 6702

Patent

active

048597376

ABSTRACT:
A polyester resin composition comprising a poly(alkylene terephthalate), said alkylene radical containing at least 3 carbon atoms, a carboxylated hydrogenated or selectively hydrogenated conjugated diolefin polymer and a transesterification catalyst. It has surprisingly been discovered that when a transesterification catalyst such as p-toluene sulfonic acid is present at a concentration within the range from about 1 mmoles to about 5 mmoles per 100 g of combined polyester and carboxylated, hydrogenated or selectively hydrogenated conjugated diolefin polymer, a significant improvement in impact strength is realized. Inclusion of a transesterification catalyst in the composition, then, enables significant improvement in impact strength even when the carboxylated, hydrogenated or selectively hydrogenated conjugated diolefin polymer is present in the composition at a concentration as low as 17 parts, by weight, per 100 parts, by weight, of polyester. The poly(alkylene terephthalate) is preferably poly(butylene terephthalate). The carboxylated, hydrogenated or selectively hydrogenated conjugated diolefin polymer is preferably an unsaturated block copolymer comprising at least one polymeric block containing predominantly monoalkenyl aromatic hydrocarbon monomer units and at least one polymeric block containing predominantly conjugated diolefin monomer units. Most preferably, the carboxylated elastomeric polymer is a maleated, selectively hydrogenated styrene-butadiene-styrene triblock copolymer.

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