Poly(1,3-propylene therephthalate)

Details Poly(1,3-propylene therephthalate) Poly(1,3-propylene therephthalate)

1998-03-06

1999-02-16

Acquah, Samuel A.

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

Synthetic resins

From carboxylic acid or derivative thereof

528279, 528277, 528280, 528285, 528286, 524706, 524710, 524777, 524783, 524785, C08G 6378, C08K 302

Patent

active

058722041

ABSTRACT:
The present invention provides a novel poly(1,3-propylene terephthalate), which is prepared from reacting terephthalic acid and 1,3-propanediol in the presence of an effective catalytic amount of ethylene glycol titanate to undergo esterification to form a monomer; and polymerizing the monomer in the presence of an effective catalytic amount of antimony acetate to obtain poly(1,3-propylene terephthalate). The obtained poly(1,3-propylene terephthalate) (PPT) has an intrinsic viscosity (IV) of 0.65-0.91 dl/g, acid number (--COOH amount) of less than 40 meq/kg, and L*>60. Without adding a pigment, the yellowness b* of PPT is below 9, even below 5. The yellowness b* of PPT even reaches below 3 when a pigment is incorporated.

REFERENCES:
patent: 4163002 (1979-07-01), Pohl et al.
patent: 4937314 (1990-06-01), Greene
patent: 5340909 (1994-08-01), Doerr et al.
patent: 5599900 (1997-02-01), Bhatia

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