POLYURETHANE FOAMS AND THEIR METHOD OF PREPARATION

专利名称：POLYURETHANE FOAMS AND THEIR

METHOD OF PREPARATION USINGSTANNOUS SALTS OF ALIPHATIC ACIDSAND BETA-HYDROXY AMINES ASCATALYSTS

发明人：EDWIN FENTON CHANDLEY,HUGH WALLIS

LEIGH,ARNOLD JOHN LOWE

申请号：US43667465申请日：19650302公开号：US3520835A公开日：19700721

摘要：Flexible polyurethane foams are prepared by reacting a polyfunctional organicisocyanate with water and a polyoxyalkylene compound containing at least two hydroxylgroups in the presence of a foam stabilizing agent, a stannous salt of an organic acid, anda tertiary amine catalyst having not more than 11 carbon atoms and containing one ortwo b -hydroxyl groups in the absence of more than 0.02% by weight based on thepolyoxyalkylene compound of other amine catalysts containing two nitrogen atoms.Preferred amine catalysts are N,N-dimethyl, - diethyl -, and - di - n - butyl-ethanolamine,N,N-dimethyl and -di-n-butyl-isopropanolamine, N-methyl ethanolamine, N-methylisopropanol cumene and N-(b -hydroxyethyl) -morpholine, and are generally used inamounts of 0.3 to 3% by weight based on the polyoxyalkylene compound. The stannouscatalysts, e.g. the octoate, oleate, g -(2-methyl-4 - chlorophenoxy) - butyrate and g (t -butylphenoxy)-butyrate are used in amounts of 0.2 to 1.2% by weight. Preferred

polyether polyols are triols obtained from propylene oxide with glycerol having a M.W.of 3,000 to 4,000. An auxiliary blowing agent, e.g. CFCl3, CF2Cl2 or CH2Cl2 may be used inthe production of lowdensity foams.

申请人：LANKRO CHEM. LTD.

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