Rare earth metal coordination compounds as lactone polymerizatio

Details Rare earth metal coordination compounds as lactone polymerizatio Rare earth metal coordination compounds as lactone polymerizatio

1991-12-30

1993-05-04

Kight, III, John

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

052082970

ABSTRACT:
A process for polymerizing lactide and up to 20 mole percent of another lactone is disclosed. The cayalysts used have the formula MZ.sub.3 wherein M is scandium, yttrium, bismuth, a lanthanide series rare earth metal or a mixture thereof and the Zs are independantly the same or different highly coordinating ligands. The preferred metals M are lanthanum, cerium, praseodymium and neodymium with lanthanum being especially preferred. The preferred ligands are betadiketones, betaketoesters and malonate anions with the beta diketones such as 2,2,6,6-tetramethyl-3,5-heptanedionates being especially preferred.

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A. J. Nijenhuis et al., Polymer Bull. (1991) 26, pp. 71-77.
Shen, Z.; Sun, J. and Wu, J., Huaxue Xuebao 48(7), pp. 686-689 (1990).
Maciej Bero et al., Makromol. Chem. 191, 2287-2296 (1990).

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