Process for the preparation of polyurethane foams
AssigneeThe Dow Chemical Company
InventorGeorge J. Wasilczyk
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Abstract
An improved process for the preparation of flexible polyurethane foams which comprise conducting the foaming in the presence of a delayed action catalyst and an inorganic filler having a pH 5 to 10, preferably 6 to 8, and an average particle size of 2-30 microns, preferably 5-15 microns. The process is suitable for slabstock and molded foams.
Claims5
In a process for preparing flexible polyurethane foams by reacting a polyol with a polyisocyanate in the presence of a foaming agent, a cell control agent and catalysts, the improvement which comprises conducting the reaction additionally in the presence of ( 1) from about 0.001 to about 1.5 parts per 100 parts of polyol of a delayed action catalyst having a T.sub..DELTA..eta.1000 /T.sub..DELTA..eta.10000 value of at least 0.7 as measured on a mixture of the polyol, polyisocyanate and delayed action catalyst components and when employed, crosslinker and water at an initial mixing temperature of about room temperature and (2) an inorganic filler having a pH of 5 to 10 and an average particle size of from about 2 microns to about 30 microns.
Dependencies are inferred from the claim text.