Title of Invention

A PROCESS FOR THE PREPARATION OF POLY (TRIMETHYLENE TEREPHTHALATE)

Abstract

In one embodiment, the invention is a process for the preparation of poly(trimethylene terephthalate) comprising: a) contacting terephthalic acid with 1,3-propanediol in the presence of an organic tin catalyst to form a bis-(3-hydroxypropyl)terephthalate monomer; and b) polymerizing said monomer in the presence of organic titanate polycondensation catalyst to obtain the poly(trimethylene terephthalate). In another embodiment, the invention is a process for the preparation of poly(trimethylene terephthalate) containing less than 1.6 mol % of DPG said process comprising contacting terephthalic acid with a 1.6 to 1 to 2:1 molar amount of 1,3-propanediol in the presence of 20 to 120 ppm (as tin), by weight of the poly(trimethylene terephthalate), of a organic tin catalyst, to form a bis(3-hydroxypropyl)terephthalate monomer and polymerizing said monomer to obtain the poly(trimethylene terephthalate). The invention is also directed to poly(trimethylene terephthalate) produced by the processes.

Full Text

FORM 2 THE PATENTS ACT 1970 [39 OF 1970] COMPLETE SPECIFICATION [See Section 10,Rule /13] PREPARATION OF POLY (TRIMETHYLENE TEREPHTHALATE)" E.I. DU PONT DE NEMOURS AND COMPANY, a Corporation organized and existing under the laws of the State of Delaware, U.S.A., of 1007 Market Street, Wilmington, Delaware 19898, United States of America The following specification particularly describes and ascertain the nature of the invention and the manner in which it is to be performed :-

Documents:

in-pct-2002-00061-mum-cancelled page(17-1-2002).pdf

in-pct-2002-00061-mum-claims(granted)-(19-10-2005).doc

in-pct-2002-00061-mum-claims(granted)-(19-10-2005).pdf

in-pct-2002-00061-mum-correspondence(23-3-2006).pdf

in-pct-2002-00061-mum-correspondence-ipo-(21-10-2004).pdf

in-pct-2002-00061-mum-form 1(17-1-2002).pdf

in-pct-2002-00061-mum-form 13(18-2-2002).pdf

in-pct-2002-00061-mum-form 19(15-7-2004).pdf

in-pct-2002-00061-mum-form 1a(29-7-2005).pdf

in-pct-2002-00061-mum-form 2(granted)-(19-10-2005).doc

in-pct-2002-00061-mum-form 2(granted)-(19-10-2005).pdf

in-pct-2002-00061-mum-form 3(17-1-2002).pdf

in-pct-2002-00061-mum-form 3(27-9-2005).pdf

in-pct-2002-00061-mum-form 3(29-7-2005).pdf

in-pct-2002-00061-mum-form 5(17-1-2002).pdf

in-pct-2002-00061-mum-form pct-ipea-409(17-1-2002).pdf

in-pct-2002-00061-mum-form pct-isa-210(17-1-2002).pdf

in-pct-2002-00061-mum-petition under rule 137(27-9-2005).pdf

in-pct-2002-00061-mum-petition under rule 138(24-10-2005).pdf

in-pct-2002-00061-mum-power of attorney(17-1-2002).pdf

in-pct-2002-00061-mum-power of attorney(20-10-2005).pdf