Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1992-04-09
1993-12-14
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
5262181, 526219, 526347, 526266, C08F 206, C08F, C08F21206, C08F23402
Patent
active
052704114
ABSTRACT:
A process for making a biodegradable aliphatic polyester and the polyester so formed is disclosed. The process comprises copolymerizing a cyclic ketene acetal having the structural formula ##STR1## where R is a bivalent moiety, and an olefin. This copolymerization occurs in a solution of a tertiary alcohol and in the presence of a free radical initiating effective amount of a compound having the structural formula ##STR2## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are the same or different and are C.sub.1 -C.sub.20 hydrocarbyl, C.sub.1 -C.sub.20 hydrocarbyloxy, cyano, halogen, carboxy, carboalkoxy, carbonyl or formyl. The copolymerization occurs at a temperature in the range of between in excess of ambient temperature and less than 100.degree. C. and at a pressure in excess of about 2,000 psi. The aliphatic polyester product of this process contains repeating structural units of the formula ##STR3## where A is a radical of a polymerized olefinic monomer; R is a bivalent moiety; x is a positive integer; and y and z are 0 or a positive integer with the proviso that the sum of y and z is at least 1, ratio of x to y is in the range of between about 3:1 and about 200,000:1, the ratio of z to y is in the range of between 0 and about 0.5:1; and said polyester has a weight average molecular weight of at least about 40,000.
REFERENCES:
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Bailey et al., J. Poly. Sci.: Poly. Chem. Ed., 20, 3021 (1982).
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William J. Bailey and Benjamin Gapud, ACS Poly. Chem. Div., Preprints 27(1) 58, 1984.
Brima Thomas S.
Chang Biau-Hung
Baracka Gerald A.
Cheng Wu C.
Quantum Chemical Corporation
Schofer Joseph L.
Tremain Kenneth D.
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