Method for decreasing the propensity for phase-out of the high m

Details Method for decreasing the propensity for phase-out of the high m Method for decreasing the propensity for phase-out of the high m

1997-02-25

1999-09-28

Cooney, Jr., John M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

0 0, C08J 908

Patent

active

059589949

ABSTRACT:
During polyoxyalkylation in the presence of certain double metal cyanide catalysts, a very high molecular weight hydrophobic fraction, i.e. a "tail", is produced during preparation of high secondary hydroxyl polyols which is believed to contribute to foam collapse in polyurethane foam formulations. The processing latitude of such foams may be improved by altering the hydrophile/lipophile balance of the high molecular weight tail by oxyalkylating with a mixture of ethylene oxide and higher alkylene oxide during the greatest portion of total oxyalkylation such that essentially pure higher alkylene oxide is present in a terminal portion of oxyalkylation not exceeding 15 weight percent of total polyol weight.

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ASTM D-2849-69, Testing Urethane Foam Polyol Raw Materials, pp. 913-931 Dec. 1969.

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