Poly(orthoester) co- and homopolymers and poly(orthocarbonate) c

Details Poly(orthoester) co- and homopolymers and poly(orthocarbonate) c Poly(orthoester) co- and homopolymers and poly(orthocarbonate) c

1976-08-16

1978-01-24

Anderson, Harold D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 783R, 260338, 2603407, 2603409R, 2603459R, 2603478, 424 32, 424 78, C08G 6302

Patent

active

040703479

ABSTRACT:
Poly(orthoester) co- and homopolymers and poly(orthocarbonate) co- and homopolymers comprising (1) a repeating dioxycarbon unit in the polymeric backbone having a plurality of organic groups pendant therefrom, and (2) a bridging moiety having at least one carbonyloxy group contained therein are disclosed. The polymers are represented by the formula: ##STR1## wherein R is a bridging moiety and is either R.sub.1 or R.sub.2 arranged in a random manner along the polymeric backbone to form a copolymer containing both R.sub.1 and R.sub.2 with R.sub.1 an aliphatic, an alicyclic or an aromatic group and R.sub.2 is a ##STR2## GROUP WITH R.sub.1 as defined and R.sub.3 an aliphatic, an alicyclic or aromatic group, or wherein R is a bridging moiety and is only R.sub.2 to form a homopolymer with R.sub.1, R.sub.2 and R.sub.3 as defined above, and a is 0 to 1, b is 2 to 6, and n and the sum of x and y are positive integers. The copolymers are useful for making articles of manufacture, including devices and coatings for delivering beneficial agents.

REFERENCES:
patent: 2630424 (1953-03-01), Gresham
patent: 3489819 (1970-01-01), Busler
patent: 3689462 (1972-09-01), Maximovitch

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