Dow Global Technolgoies LLC

Matthias Schaefer

David A Babb

William Hoy Heath

David Laitar

Wenwen Li

Jean-Paul Masy

William Aaron Koonce

Arjun Raghuraman

John G Pendergast, Jr

Dwight D Latham

Carlos M Villa

Anna Forlin

Laura A Grier

David A Eversdyk

Maria Pollard

Nima N Nikbin

Irfan Khan

Steven Strand

Paul D Ries

Bindushree Radhakrishnan

Patrick Fontanella

Rafael Benavides

Maria Jose Nieves Remacha

Oguz TÜRÜNÇ

An Adams

John G Pendergast

Sven Claussens

Carola Meinl

Sonet Vermaire

Alkylene oxides are polymerized in a tubular reactor. The alkylene oxide is continuously introduced into the tubular reactor through multiple introduction points located along the length of the tubular reactor. Monomer flow rates are increased along the length of the reactor to maintain a nearly constant concentration of unreacted alkylene oxide.

Alkoxylation process using tubular reactor

Vinyl-functional alcohols are silylated by reaction with a hydrolysable silyl hydride compound. The starting alcohol is heated and then combined with the silyl hydride and catalyst and allowed to heat exothermically. Cooling is applied when the conversion of vinyl groups is between 90-99%. In some embodiments, specified amounts of water are present. The cooling regimen and control of water content reduces certain side reactions, leading to greater yields to desired product.

Hydrosilylation method

A method of producing a high primary hydroxyl group content and a high number average molecular weight polyol includes preparing a mixture that includes a double metal cyanide catalyst and a low molecular weight polyether polyol having a number average molecular weight of less than 1,000 g/mol, the polyether polyol is derived from propylene oxide, ethylene oxide, or butylene oxide, setting the mixture to having a first temperature, adding at least one selected from propylene oxide, ethylene oxide, and butylene oxide to the mixture at the first temperature, allowing the mixture to react to form a reacted mixture, adding a Lewis acid catalyst to the reacted mixture, setting the reaction mixture including the second catalyst to have a second temperature that is less than the first temperature, and adding additional at least one selected from propylene oxide, ethylene oxide, and butylene oxide to the reacted mixture at the second temperature such that a resultant polyol having a primary hydroxyl group content of at least 60% and a number average molecular weight greater than 2,500 g/mol is formed.

Dual catalyst system for high primary hydroxyl polyols

The invention provides a mixing system comprising the following:

Mixing system comprising an extensional flow mixer

Natural oil-based polyols that are high in color, e.g., &#x3e;40 APHA, are decolorized when exposed to high frequency visible light and/or low frequency UV light, with or without the combination of heat and/or air exposure.

Decolorization of polyols

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Philippine, Netherlands

Matthias Schaefer