Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1991-11-27
1993-08-17
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528271, 528272, 528274, C08G 6378, C08G 6382, C08G 6387
Patent
active
052370429
ABSTRACT:
This invention relates to processes for the preparation of polybutylene terephthalate based polymer, which processes produce polymer having excellent color, a small amount of side-product and a high degree of polymerization within a short time. Complex catalyst which is employed comprises antimony compounds and titanium compounds, optionally together with phosphorous based compounds and hindered phenolic, and the catalyst decreases the phenomena that conventional catalysts of tin and titanium based compounds have of making the polymer colored by declining hydrolyzation and heat-stability. The catalyst also decreases the amount of side-product, THF sharply. As a result, improved polybutyleneterephthalate can be prepared.
REFERENCES:
patent: 3936421 (1976-02-01), Hayashi et al.
Kuratsuji et al. CA115(10): 93215e Jpn. Kosai Tokkyo Koho, 7 pp.; abstract.
Azuma et al. CA112(18): 159238m Jpn. Kokai Tokkyo Koho, 10 pp.; abstract.
Fortunato et al. CA110(20): 173811h Polym. Commun., 30(2), 55-57; abstract.
Cho Hyun N.
Kim Chung Y.
Kim Young C.
Kight III John
Korea Institute of Science and Technology
Mosley T.
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