Process for the continuous production of high-molecular polybuty

Details Process for the continuous production of high-molecular polybuty Process for the continuous production of high-molecular polybuty

1986-06-05

1987-07-14

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

528283, C08G 6304, C08G 6334

Patent

active

046803769

ABSTRACT:
A process for continuous production of high molecular polybutyleneterephthalate by direct esterification of terephthalic acid and 1,4 butanediol in the presence of tin- or titanium-containing catalysts at preferred temperatures of 235.degree. to 250.degree. C., and preferred pressures of 0.3 to 0.6 bar during the first stage--with minimal formation of tetrahydrofurane--followed by precondensation and polycondensation at reduced pressure.

REFERENCES:
patent: 4014858 (1977-03-01), Chipman et al.
patent: 4499261 (1985-02-01), Heinze et al.

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