Process for producing polyesters using a niobium compound as a c

Details Process for producing polyesters using a niobium compound as a c Process for producing polyesters using a niobium compound as a c

1988-03-24

1989-04-04

Kight, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528277, 528279, 528283, 528286, 528308, 5283086, 524700, 524706, 524783, 524784, 524796, C08G 6304

Patent

active

048188085

ABSTRACT:
A process for producing a linear polyester comprising a main structural unit of an aromatic dicarboxylic acid ester of an alkylene glycol, particularly, comprising a polyethylene terephthalate or polytetramethylene terephthalate unit, is provided. In the process of the invention, the polycondensation reaction is conducted in the presence of a niobic acid catalyst that is obtained by heat-treating a hydrated niobium compound at the temperature range between 80.degree. C. and 400.degree. C. The process of the invention is also effecitvely applied to the manufacture of an elastomeric polyester comprising a polyalkylene terephthalate as a hard segment and a polyalkylene glycol as a soft segment.

REFERENCES:
patent: 3127375 (1964-03-01), Keck
patent: 3758438 (1973-09-01), Freitag
patent: 3936421 (1976-02-01), Hayashi et al.
patent: 4205157 (1980-05-01), Duh
patent: 4365031 (1982-12-01), Massey et al.
patent: 4374949 (1983-02-01), Massey et al.
patent: 4435562 (1984-03-01), Sullivan et al.
patent: 4469747 (1984-09-01), Sasaki et al.
patent: 4496704 (1985-01-01), Ginnings
patent: 4766181 (1988-08-01), Ostrozynski et al.

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