Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1990-11-05
1991-08-13
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528274, 528300, 528308, 528371, 528372, 524714, 524720, 524792, C08G 6378, C08G 6382
Patent
active
050397834
ABSTRACT:
Macrocyclic polyester oligomer compositions comprising alkylene isophthalate or terephthalate units or the like are prepared by the reaction of a diol with a diacid chloride in the presence of at least one amine characterized by substantially no steric hindrance around the basic nitrogen atom. The reaction is conducted under substantially anhydrous conditions and at a temperature form about -25.degree. to about +25.degree. C. The resulting macrocyclic oligomers may be converted to linear polyesters by contact with catalysts including alkali metal salicylates, stannous alkoxides and organotin compounds.
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Bradt Jean E.
Brunelle Daniel J.
Acquah Sam A.
Davis Jr. James C.
General Electric Company
Kight III John
Pittman William H.
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