Monodispersed polymer or copolymer and a preparation process the

Details Monodispersed polymer or copolymer and a preparation process the Monodispersed polymer or copolymer and a preparation process the

1995-02-28

1996-08-27

Dodson, Shelley A.

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

Synthetic resins

From carboxylic acid or derivative thereof

525415, 525461, 528196, 528354, 528357, C08G 6384, C08G 6391, C08G 6400

Patent

active

055502091

ABSTRACT:
Disclosed are a lactone polymer, a carbonate polymer, a lactone-carbonate random or block copolymer which are mono-dispersed, that is, which have a molecular weight distribution of nearly 1, or, in which purity of a polymer component having a unitary structure is very high, and processes for the preparation thereof which comprise a ring-opening addition reaction of a lactone monomer and/or a cyclic carbonate monomer with a ring-opening initiator in the presence of 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.

REFERENCES:
patent: 5095098 (1992-03-01), McLain et al.
patent: B15028667 (1993-02-01), McLain et al.

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