Process for producing unsaturated polyester and unsaturated polyester resin composition
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United States of America Patent
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Mar 5, 2002
Grant Date -
N/A
app pub date -
Jul 28, 2000
filing date -
Jul 28, 1999
priority date (Note) -
Expired
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Abstract
A process for producing an unsaturated polyester comprising the steps of (1) (A)depolymerizing polyethylene terephthalate with a polyhydric alcohol, (B) adding maleic anhydride to the depolymerization product to allow them to react with each other, and (C) adding dicyclopentadiene to the reaction mixture to cause addition reaction and (2) adding a polyhydric alcohol and a polybasic acid to the reaction product obtained in step (1) to cause polycondensation reaction is disclosed. An unsaturated polyester resin composition comprising the unsaturated polyester and a polymerizable unsaturated monomer, and a molding compound comprising the unsaturated polyester resin composition are also disclosed.
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