Block copolymer and method of preparing same

Details Block copolymer and method of preparing same Block copolymer and method of preparing same

1987-09-29

1989-07-25

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...

525171, C08G 8102, C08L 5302

Patent

active

048514748

ABSTRACT:
A modified unsaturated polyester useful in preparing molded products having improved impact resistance and surface characteristics is prepared as a block copolymer comprising at least one polyester block and an elastomeric block. The modified unsaturated polyester is prepared by reacting an elastomeric polymer having at least one terminal functional group selected from the group consisting of carboxyl groups, hydroxyl groups and mixtures thereof with either a preformed unsaturated polyester, thereby producing the modified unsaturated polyester directly or with monomer useful in preparing an unsaturated polyester and thereafter growing the unsaturated polyester via condensation of additional monomer. The elastomer is, preferably, a block copolymer comprising at least one polymer block containing predominantly monoalkenyl aromatic hydrocarbon monomer and at least one polymer block containing predominantly conjugated diolefin monomer units. The modified unsaturated polyester is useful in thermosetting resin compositions.

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