Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1986-05-01
1988-03-01
Nielsen, Earl
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528354, 528499, C08G 6374
Patent
active
047287217
ABSTRACT:
The present invention provides a biodegradable high molecular polymer characterized in that the content of water-soluble low molecular compounds, as calculated on the assumption that said compounds each is a monobasic acid, is less than 0.01 mole per 100 grams of said high molecular polymer.
The thus-obtained molecular polymer has good aging stability and can be used advantageously as an excipient for pharmaceutical preparations.
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patent: 3565869 (1971-02-01), De Prospero
patent: 3839297 (1974-10-01), Wasserman et al.
patent: 3890283 (1975-06-01), Casey et al.
patent: 4273920 (1981-06-01), Nevin
patent: 4605730 (1986-08-01), Shalaby et al.
Colin G. Pitt, et al. "Sustained Drug Delivery Systems". I. The Permeability of Poly(eta-Caprolactone), Poly (DL-Lactic Acid), and Their Copolymers, Journal of Biomedical Materials Research, vol. 13, pp. 498-507 (1979).
Miyagawa Tsutomu
Ogawa Yasuaki
Okada Hiroaki
Yamamoto Masaki
Nielsen Earl
Takeda Chemical Industries Ltd.
Wako Pure Chemical Industries Ltd.
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