Yttrium and rare earth compounds catalyzed lactone polymerizatio

Details Yttrium and rare earth compounds catalyzed lactone polymerizatio Yttrium and rare earth compounds catalyzed lactone polymerizatio

1989-09-29

1991-07-02

Nielsen, Earl

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

Synthetic resins

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

528354, 528357, C08G 6384, C08G 6391

Patent

active

050286676

ABSTRACT:
Process for yttrium and rare earth compound catalyzed polymerization of lactones and the living polymer compositions of such polymerizations, novel polyester products of such polymerizations and novel yttrium and rare earth metal compounds useful as catalysts in the polymerization of biodegradable polymers for medical uses and flexible films for packaging.

REFERENCES:
patent: 2878236 (1959-03-01), Young et al.
patent: 4289873 (1981-09-01), Kubo et al.
patent: 4357462 (1982-11-01), Kubo et al.

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