Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1982-11-12
1984-03-20
Nielsen, Earl A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
128 92C, 128335, 1283355, 1283481, 525408, 525450, C08G 6306
Patent
active
044382537
ABSTRACT:
Multiblock copolymers having the following general formula: ##STR1## where R represents alkylene and Ar is an aromatic group, are obtained by transesterification of poly(glycolic acid) and an hydroxyl-ended poly(alkylene glycol) such as poly(oxyethylene) in the presence of a catalyst with the degree of polymerization of the copolymer being increased by the subsequent addition of an aromatic orthocarbonate such as tetra-p-tolyl orthocarbonate. The copolymers find use in the manufacture of surgical articles, particularly absorbable monofilament sutures possessing the desired characteristics of flexibility, resulting in good handling properties, and biodegradability.
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Casey Donald J.
Huffman Kenneth R.
American Cyanamid Company
Costello, Jr. Charles F.
Nielsen Earl A.
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