E.i. Dupont De Nemours and Company

E. I. Du Pont Nemours and Co.

Howard Chung-Ho Ng

Hari Babu Sunkara

Leo E Manzer

Ernest Keith Andrew Marchildon

Leo Ernest Manzer

Pallatheri M Subramanian

Ross A Lee

Chun Sing Wong

Herbert Vernon Bendler

Ernest Keith Marchildon

A process is provided comprising contacting 1,3-propanediol with a suitable polymerization catalyst to produce polytrimethylene ether glycol or random polytrimethylene ether ester, wherein the 1,3-propanediol comprises about 10 microg/g or less peroxide compounds, based on the weight of 1,3-propanediol, and about 100 microg/g or less carbonyl compounds based on the weight of the 1,3-propanediol. Preferably, the 1,3-propanediol comprises about 100 microg/g or less of monofunctional alcohol compounds based on the weight of the PDO. In addition, polytrimethylene ether glycol and random polytrimethylene ether ester prepared by the process.

Polytrimethylene ether glycol and polytrimethylene ether ester with excellent quality

The invention is a continuous process for the preparation of polytrimethylene ether glycol from 1,3-propanediol reactant. In addition, the invention is directed to a continuous multi-stage process comprising reacting at least one reactant in a liquid phase in an up-flow column reactor, and forming a gas or vapor phase by-product wherein the gas or vapor phase by-product is continuously removed at the top and at least one intermediate stage.

Continuous process for the preparation of polytrimethylene ether glycol

Multilayer shaped articles, including films, preforms and containers, and method for forming the same, having at least one layer of poly(1,3-propylene 2,6-naphthalate) and at least one layer of poly(ethylene terephthalate). Poly(1,3-propylene 2,6-naphthalate) can be co-stretched with poly(ethylene terephthalate) to form oriented multilayer structures which have superior barrier properties. The poly(1,3-propylene 2,6-naphthalate) and poly(ethylene terephthalate) layers have good adhesion and do not require an adhesive tie layer.

Multilayer structures of poly(1,3-propylene 2,6 napthalate) and poly (ethylene terephthalate)

Disclosed are physical blends of poly(1,3-propylene 2,6-naphthalate) polymer compositions with other polymers in which the concentration of poly(1,3-propylene 2,6-naphthalate) is from 1 to 99 mole %.

Blends of poly(1,3-propylene 2,6-naphthalate)

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Kingston, Canada

Howard Chung-Ho Ng