Process for preparing very viscous heat stable poly(butylene ter

Details Process for preparing very viscous heat stable poly(butylene ter Process for preparing very viscous heat stable poly(butylene ter

1979-02-14

1980-04-29

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

528298, 528309, 525437, C08G 6318

Patent

active

042007321

ABSTRACT:
In a process for preparing very viscous, heat-stable poly(butylene terephthalate) by condensing terephthalic acid, or a lower alkyl ester thereof, with 1,4-butanediol in two stages at an elevated temperature and in the presence of conventional catalysts, an improvement comprises carrying out the condensation in the presence of 0.5 to 15 mole %, relative to the number of moles of terephthalic acid units, of 9,10-dihydro-9,10-[cis-11,12-bis(hydroxymethyl)-ethano]-anthracene.

REFERENCES:
patent: 3953404 (1976-04-01), Borman
patent: 3962190 (1976-06-01), Wear
patent: 3966680 (1976-06-01), Wear
patent: 4022752 (1977-05-01), Horn
patent: 4101601 (1978-07-01), Thomas
patent: 4132707 (1979-01-01), Borman

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