Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1993-12-09
1996-05-14
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528357, 528361, 556 83, C08G 6308
Patent
active
055168833
ABSTRACT:
A biodegradable, optically active copolymer is disclosed. The copolymer is represented by general formula (I): ##STR1## wherein R.sup.1 represents a group selected from the group consisting of methyldimethylene, 1,2-dimethyldimethylene, 1,1-dimethyldimethylene, methyltrimethylene, tetramethylene, methyltetramethylene, pentamethylene, 1,4-dimethyl-2-oxo-3-oxytetramethylene, 2-oxo-3-oxytetramethylene, and 2-methyl-3-oxypentamethylene, and m and n each represents a natural number of from 10 to 15,000. According to the present invention, useful polymers which are a new type of functional materials characterized as having optical activity, biodegradability (enzymatic degradability), and hydrolyzability can be easily produced in an industrially advantageous manner by the ring-opening copolymerization of optically active .beta.-butyrolactone with various lactones.
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Billingham et al., Journal of Organometallic Chemistry, "Polymerization and copolymerization of B-butyrolactone by aluminum compounds", vol. 341, No. 1-3, pp. 83-93, Mar. 1988.
Zhang et al., Macromolecules, "Stereo Chemistry of the Ring Opening Polymerization of (S)-B-Butyrolactone", vol. 23, No. 13, pp. 3206-3212, Jun. 1990.
Hori Yoji
Yamaguchi Akio
Dodson Shelley A.
Marquis Melvyn I.
Takasago International Corporation
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