Back to results
US 4,079,038 AGranted
Poly(carbonates)
AssigneeAlza Corporation
InventorsNam Sok Choi, Jorge Heller
Life of this patent
Estimating the term…
Abstract
Poly(orthoester carbonates) and poly(orthocarbonate carbonates) having a repeating linear carbonate unit and a recurring symmetrical dioxycarbon moiety with a plurality of organic groups pendant from the carbon atom thereof are disclosed. The polymers are represented by the structural formula: ##STR1## WHEREIN A IS 0 TO 1, B IS 2 TO 6 WHEN A IS 0, B IS 2 TO 5 WHEN A IS 1, AND N IS GREATER THAN 10.
Claims11
A copolymer of the general formula:
- ##STR38## wherein R.sub.1 is a member selected from the group consisting of alkylene of 1 to 10 carbons;
- alkenylene of 2 to 10 carbons;
- alkyleneoxa of 2 to 20 carbons;
- alkenyleneoxa of 4 to 20 carbons;
- cycloalkylene of 3 to 7 carbons;
- cycloalkylene of 3 to 7 carbons substituted with alkyl of 1 to 10 carbons, alkylene of 1 to 10 carbons, alkenyl of 2 to 10 carbons, alkenylene of 2 to 10 carbons, and alkoxy of 1 to 10 carbons;
- cycloalkenylene of 5 to 7 carbons;
- cycloalkenylene of 5 to 7 carbons substituted with an alkyl of 1 to 10 carbons, alkylene of 1 to 10 carbons, alkenyl of 2 to 10 carbons, cycloalkenylene of 2 to 10 carbons, and alkoxy of 1 to 10 carbons;
- arylene;
- and arylene of 6 to 26 carbons substituted with an alkyl of 1 to 10 carbons, alkylene of 1 to 10 carbons, an alkenyl of 2 to 10 carbons and alkoxy of 1 to 10 carbons;
- and wherein a is 0 to 1, b is 2 to 6 when a is 0, b is 2 to 5 when a is 1, and n is at least 10.
8 more elements
Dependencies are inferred from the claim text.