E.i. Dupont De Nemours and Company

Nutrition & Biosciences USA 4, Inc.

Dupont Industrial Biosciences Usa, LLC

Yuanfeng Liang

Joseph V Kurian

Robert DiCosimo

Qiong Cheng

Jayme L Paullin

Yefim Brun

Rakesh Nambiar

Charles R Powley

Donald Edward Putzig

Richard Allen Hayes

Christopher P Junk

Jing Chung Chang

Rong Guan

Marko Strukelj

Matthew Arthur Page

Rameshchandra M Gohil

Edward J Stancik

Jing-Chung Chang

Noel M Hasty

Susan Yen-Tee Tseng

Joseph P McKeown

Joseph Varapadavil Kurian

Joseph P Mckeown

Compositions are disclosed herein comprising dextran that comprises (i) 87-93 wt % glucose linked at positions 1 and 6; (ii) 0.1-1.2 wt % glucose linked at positions 1 and 3; (iii) 0.1-0.7 wt % glucose linked at positions 1 and 4; (iv) 7.7-8.6 wt % glucose linked at positions 1, 3 and 6; and (v) about 0.4-1.7 wt % glucose linked at (a) positions 1, 2 and 6, or (b) positions 1, 4 and 6. Aqueous forms of this composition have enhanced viscosity profiles. Further disclosed are methods of using compositions comprising dextran, such as increasing the viscosity of an aqueous composition. Enzymatic reactions for producing dextran are also disclosed.

Enzymatically polymerized gelling dextrans

Sulfonated aliphatic-aromatic polyester compositions having improved thermal properties and biodegradability, and articles such as films, coatings and laminates, produced from the sulfonated aliphatic-aromatic polyester compositions, are provided.

Aliphatic-aromatic polyesters, and articles made therefrom

Improved flame retardant polytrimethylene terephthalate compositions are provided by including a melamine cyanurate flame retardant additive.

Flame retardant polytrimethylene terephthalate composition

Ester-modified dicarboxylate polymers

A poly(trimethylene terephthalate) polymer composition (a) comprising repeat units derived from terephthalic acid and 1,3- propanediol, (b) having a b value of less than about 10, and (c) having an intrinsic viscosity (IV) in the range from about 0.74 to about 2.0. The poly(trimethylene terephthalate) polymer composition does not contain a blue masking pigment. It is prepared by a process comnprising contacting, in the presence of a catalyst comprises tin and titanium. A copolymer that contains up to 20 mole percent of another acid and/or a second alcohol is also disclosed. Further disclosed is a composition of, or comprising, a bis ( -hydroxypropyl) terephthalalte prepolymer. The bis ( -hydroxypropyl) terephthalalte prepolymer and poly(trimethylene terephthalalte) can each contain 10 to 100 ppm tin and 10 to 200 ppm titanium relative to the terephthalic acid content.

Poly (trimethylene terephthalate) polymer composition

Preparation of poly(trimethylene terephthalate) with low level of di(1,3-propylene glycol)

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.

Preparation of poly(trimethylene terephthalate)

A process that can be used in an esterification and polycondensation processes to produce a polyester such as, for example, poly(trimethylene terephthalate) is disclosed. The process comprises contacting an acid with 1,3-propanediol in the presence of a catalyst comprising tin and titanium. A copolymer that contains up to 20 mole percent of another acid and/or a second alcohol is also disclosed. Further disclosed are a composition of, or comprising, a bis(3-hydroxypropyl) terephthalate prepolymer or a composition of, or comprising, a poly(trimethylene terephthalate) polymer. The bis(3-hydroxypropyl) terephthalate prepolymer and poly(trimethylene terephthalate) can each contain 10 to 100 ppm tin and 10 to 200 ppm titanium relative to the terephthalic acid content.

Esterification process

This invention relates to an improved transesterification process for the preparation of bis(3-hydroxypropyl) terephthalate monomer from 1,3-propanediol and a dialkyl terephthalate using a lanthanum compound transesterification catalyst.

Transesterification process using lanthanum compound catalyst

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Chadds Ford, PA, United States of America

Yuanfeng Liang