Crystalline polyglycolic acid, polyglycolic acid composition and production process thereof
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United States of America Patent
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Issued Date -
Jul 3, 2003
app pub date -
Nov 2, 2001
filing date -
Oct 31, 2001
priority date (Note) -
Abandoned
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Abstract
Crystalline polyglycolic acid wherein a difference between the melting point Tm and the crystallization temperature Tc.sub.2 is not lower than 35.degree. C., and a difference between the crystallization temperature Tc.sub.1 and the glass transition temperature Tg is not lower than 40.degree. C. A production process of polyglycolic acid modified in crystallinity, comprising applying heat history to crystalline polyglycolic acid at a temperature of not lower than (the melting point Tm of the crystalline polyglycolic acid+38.degree. C.). A polyglycolic acid composition comprising crystalline polyglycolic acid and a heat stabilizer, wherein a difference (T.sub.2-T.sub.1) between the temperature T.sub.2 at 3%-weight loss on heating of the polyglycolic acid composition and the temperature T.sub.1 at 3%-weight loss on heating of the crystalline polyglycolic acid is not lower than 5.degree. C.
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