Alkylene oxide-lactone copolymers

Details Alkylene oxide-lactone copolymers Alkylene oxide-lactone copolymers

2006-11-28

2006-11-28

Hightower, P. Hampton (Department: 1711)

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

Synthetic resins

From carboxylic acid or derivative thereof

C528S355000, C528S357000, C528S358000, C528S359000, C528S361000, C528S405000, C525S408000, C525S411000, C525S413000, C525S415000

Reexamination Certificate

active

07141643

ABSTRACT:
A block copolymer is disclosed, which comprises a first block comprising polymerized units of an alkylene oxide and a second block comprising polymerized units of an alkylene oxide and a lactone, said copolymer being obtainable by polymerizing an alkylene oxide in the presence of an organic initiator to form said first block, and reacting the first block with a mixture of an alkylene oxide and a lactone. Such copolymers are found to have improved foam inhibition characteristics while maintaining their biodegradable properties.

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