Ortho and thio-ortho ester polymer

Details Ortho and thio-ortho ester polymer Ortho and thio-ortho ester polymer

1989-06-15

1991-05-07

Anderson, Harold D.

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

Synthetic resins

From sulfur-containing reactant

528364, 528392, C08G 6700

Patent

active

050138219

ABSTRACT:
Biodegradable ortho ester polymers based on mono- and poly-thiols are provided that are useful for making biodegradable sustained release agent dispensers and which contain at least one of the mer units (I), (II), (III) or (IV) ##STR1## wherein X is a quadrivalent organic grouping, A and B are independently selected from the group consisting of hydrogen and lower alkyl, and R is hydrocarbyl or oxyhydrocarbyl of 1 to 14 carbon atoms, if oxyhydrocarbyl, containing 1 to 4 oxy groups, and may be either aliphatic or aryl, unsubstituted or substituted with one or more lower alkyl, amino, nitro or halogen moieties.

REFERENCES:
patent: 2996516 (1961-08-01), Guest et al.
patent: 4093709 (1978-06-01), Choi et al.
patent: 4131648 (1978-12-01), Choi et al.
patent: 4139344 (1979-02-01), von der Eltz
patent: 4180646 (1979-12-01), Choi et al.
patent: 4304767 (1981-12-01), Heller et al.

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