Poly(glycolic acid)/poly(oxyethylene) triblock copolymers and me

Details Poly(glycolic acid)/poly(oxyethylene) triblock copolymers and me Poly(glycolic acid)/poly(oxyethylene) triblock copolymers and me

1982-11-12

1984-06-05

Nielsen, Earl A.

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

Synthetic resins

From carboxylic acid or derivative thereof

128 92C, 128335, 1283355, 525408, 528361, C08G 6308

Patent

active

044529732

ABSTRACT:
Poly(glycolic acid)/poly(oxyalkylene) ABA triblock copolymers having the following formula: ##STR1## and wherein x and y have values which correspond to a total polyglycolide content of about 75 to 95 weight percent and a total polyoxyalkylene content of about 5 to 25 weight percent. The copolymers are useful for manufacturing fibers possessing a sufficiently low modulus of elasticity to permit their use as absorbable sutures having the requisite flexibility for use in monofilament form. A process of preparation involves purifying the hydroxyl-ended poly(oxyalkylene) and allowing it to react with glycolide to produce an ABA triblock copolymer of extrusion grade in which A represents a polyglycolic acid block and B represents a poly(oxyalkylene) block.

REFERENCES:
patent: 2917410 (1959-12-01), Vitalis
patent: 3636956 (1972-01-01), Schnieder
patent: 3784585 (1974-01-01), Schmitt et al.
patent: 4048256 (1977-09-01), Casey et al.
patent: 4243775 (1981-01-01), Rosensaft et al.
Reed et al., "Trans. Am. Soc. Artif. Intern. Organs", 1977, p. 109, Biodegradable Elastomeric Biomaterials-Polyethylene Oxide/Polyethylene Terephthalate Copolymers.

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