E.i. Dupont De Nemours and Company

Other

Edward R Murphy

Scott Christopher Jackson

Aaron Minter

Christian Hoffmann

Rupert Spence

Mark Andrew Harmer

Howard C Ng

Bhuma Rajagopalan

Lew E Plummer

Tuyu Xie

James M Tocyloski

Processes for reducing the color of polytrimethylene ether glycol or copolymers thereof are provided. The processes include polycondensing diols in the presence of an acid catalyst and adding base continuously over a period of the polycondensation reaction. The invention also relates to the polytrimethylene ether glycol thereof produced by these processes.

Polytrimethylene ether glycol or copolymers thereof having improved color and processes for their preparation

Processes for producing polytrimethylene ether glycol and copolymers thereof are provided wherein, by condensing and recycling at least a portion of the vapor phase produced as the reaction progresses, the yield loss and polymer color are reduced.

Processes for producing polytrimethylene ether glycol and copolymers thereof

Polyalkylene ether glycol or copolymer thereof are prepared by contacting at least one alkanediol with a alkanediol containing cyclic sulfate.

Process for the preparation of polyalkylene ether glycol

This invention relates to a process for preparing polytrimethylene ether glycols or copolymers thereof having a number-average molecular weight of at least about 250 g/mole by a polycondensation reaction using at least one acid catalyst.

Preparation of polytrimethylene ether glycol or copolymers thereof

An upper mounting portion of a support stand is connected to a carpet cleaning wand between two handles. A lower support leg of the stand is pivotally movable between an in-use position and a stowed position. In its in-use position the lower support leg is in affect an endwise extension of the mount and together with the inlet end of the wand forms a three point support, supporting the wand in an elevated attitude closely approximating the wands in-use attitude. A single spring serves to bias the support leg in both its in-use position and its stowed position.

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Wilmington, DE, United States of America

Edward R Murphy