Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-02-18
1998-11-10
Buttner, David
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525413, 525415, 528354, 528357, C08G 6526, C08G 6418, C08G 63664, C08L 6704
Patent
active
058345671
ABSTRACT:
Disclosed are a biodegradable copolymer and a biodegradable article molded therefrom, said copolymer having a number average molecular weight ranging from 1,000 to 1,000,000 consisting essentially of (A) from 5 to 99% by mol of epsilon-caprolactone or delta-valerolactone structural units and (B) from 95 to 1% by mol of oxetane structural units, said structural units being combined in the state of a block, and containing an organic aluminum-based Lewis acid represented by general formula (I) ##STR1## wherein R is an alkyl group having a carbon number ranging from 1 to 4, Y is independently selected from a substituted group, and p is any one of 1, 2 and 3. Also disclosed are block polymers of lactone and dimethyltrimethylene carbonate and blends of polylactone with polyoxetane.
REFERENCES:
patent: 3489819 (1970-01-01), Busler
patent: 3689531 (1972-09-01), Critchfield
patent: 5352515 (1994-10-01), Jarrett
Duda "Preparation of Telechelic Polyester Oligodiols" Macromolecules 27(2); 1994 pp. 576-582.
Buttner David
Daicel Chemical Industries Ltd.
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