Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1999-02-02
2000-10-17
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528281, 528285, 528286, 528300, 528301, 528306, 528307, 528308, 5283086, 524706, 524709, 524710, 524713, C08G 6378, C08J 549
Patent
active
061334049
ABSTRACT:
A biodegradable polyester is formed by carrying out esterification and polycondensation with a carboxylic acid monomer group comprising at least one aliphatic dicarboxylic acid containing 2 to 14 carbon atoms and at least one aromatic or alicyclic carboxylic acid, and at least one glycol in the presence of a composite catalyst comprising a titanium compound, a zinc compound, an antimony compound and a phosphorous compound. The composite catalyst significantly improves the reaction rate of polyester polymerization as well as increases the production amounts of the polyester, as compared with conventional catalysts. The polyester is high in molecular weight, excellent in thermal and mechanical properties by virtue of the introduction of the aromatic or alicyclic carboxylic acid or its derivative, in addition to showing good biodegradability. This polyester can replace preexisting, expensive aliphatic polyesters.
REFERENCES:
patent: 3927052 (1975-12-01), Vizurraga
patent: 4269945 (1981-05-01), Vanderhider et al.
patent: 4337181 (1982-06-01), Otey et al.
patent: 4859743 (1989-08-01), Anbrose et al.
Kang Hye Jung
Kim Yong Joo
Park Sang Soon
Acquah Samuel A.
National Institute of Technology and Quality
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