Mono-or biaxially-stretched polyester resin foamed sheets and films
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United States of America Patent
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Feb 24, 2004
Grant Date -
N/A
app pub date -
Mar 20, 2000
filing date -
May 24, 1999
priority date (Note) -
Expired
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Abstract
Mono- or biaxially-stretched polyester resin foamed sheets and films wherein the polyester resin has a melt strength of more than 1 centinewton at 280.degree. C., a melt viscosity of at least 1500 Pa.s at 280.degree. C. for a shear ratio which tends to zero and a crystallization rate such that for a 10-minute heating at 120.degree. C. the crystallinity can reach values as high as 30-35%.
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