Thermoplastic polyester series resin foamed material and production process thereof
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United States of America Patent
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Jul 28, 1992
Issued Date -
N/A
app pub date -
Dec 26, 1990
filing date -
Dec 27, 1989
priority date (Note) -
Expired
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Abstract
A thermoplastic polyester series foamed material having a thickness of at least 3 mm and an apparent density of from 0.05 to 0.7 g/cm.sup.3 is disclosed, wherein the crystallinity of the resin in the surface portion within 0.5 mm from the surface of the foamed material is not more than 30% and at least 1% lower than the crystallinity of the resin in the central portion of the foamed material.
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