Union Carbide Corporation

Arco Chemical Technology, L.p.

Richard C Myerly

Frank E Critchfield

Donald W Simroth

Michael W Jorgenson

Edgar G Shook

John F Timberlake

Siusun K Leung

A stabilizer for polymer/polyols characterized by four key features: (1) prepared from a starting polyol having a functionality greater than 4; (2) having at least 60% retained unsaturation; (3) having a viscosity greater than 2000 cSt; and (4) prepared where the starting polyol is capped with alkylene oxide and/or the adduct formed between the starting polyol and the reactive unsaturated compound is capped with ethylene oxide.

Stabilizers for polymer/polyols

This invention relates to silicon-based polymer/polyol stabilizers, processes for their manufacture and polyurethane foams containing these stabilized polymer polyols.

Silicone-based stabilizers useful in the preparation of improved

A normally liquid, stable polymer/polyol composition which imparts improved combustion resistance to polyurethane foams prepared therefrom while retaining satisfactory foam tensile properties are formed by polymerizing in the presence of a free radical catalyst and in the essential absence of an alkyl mercaptan, (1) from about 25 to about 60 weight percent of an ethylenically unsaturated monomer or monomers, for example, a mixture of acrylonitrile and styrene in a weight ratio respectively of 25:75 to 0:100, dissolved or dispersed in (2) from about 40 to about 75 weight percent of a polyol comprising a base polyol having a hydroxyl number of less than about 150, wherein the polymer is characterized by a crosslinking coefficient of less than 55 and an intrinsic viscosity of at least 0.30. A process for treating the resulting polymer/polyol composition to reduce the product viscosity to essentially the indigenous system viscosity in polymer/polyol compositions of this type is disclosed, as is a stabilizer precursor which assists in stabilizing the resulting polymer/polyol compositions.

Polymer/polyols having improved combustion resistance and intrinsic

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Charleston, WV, United States of America

Richard C Myerly