Lactic acid polymer and process for producing the same

Details Lactic acid polymer and process for producing the same Lactic acid polymer and process for producing the same

2006-03-28

2006-03-28

Hightower, P. Hampton (Department: 1711)

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

Synthetic resins

From carboxylic acid or derivative thereof

C528S355000, C528S357000, C528S358000, C528S359000, C528S361000, C528S363000, C528S480000, C528S491000, C528S494000, C528S495000, C528S497000, C528S498000, C424S457000, C424S458000, C424S459000, C424S452000, C424S455000, C264S004100, C264S004600, C525S408000, C525S411000, C525S413000, C525S415000

Reexamination Certificate

active

07019106

ABSTRACT:
A process for producing a lactic acid polymer of 15,000 to 50,000 in weight-average molecular weight, the content of polymeric materials having not more than about 5,000 in weight-average molecular weight therein being not more than about 5% by weight, characterized by hydrolyzing a high molecular weight lactic acid polymer, placing the resultant solution comprising the hydrolyzed product under a condition capable of precipitating the objective lactic acid polymer, separating the precipitated lactic acid polymer and collecting them. The lactic acid polymer is useful as a matrix for sustained-release preparations. The sustained-release microcapsule preparation encapsulating a physiologically active substance can fully prevent the initial excessive release of the physiologically active substance from the microcapsules and keep a stable release rate over a long period of time.

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