Open celled polyurethane foams and methods and compositions for preparing such foams
AssigneeStepan Company
InventorsWarren Kaplan, Paul Neill
Life of this patent
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Abstract
Disclosed are methods and compositions for preparing polyurethane foams using emulsified polyol mixture comprising (a) a polyol formulation comprising a polyester polyol having an OH value of from about 150 to 350; and (b) a cell opening agent.
Claims15
A method for preparing a pour-in-place polymeric foam comprising urethane units and having an open-cell content sufficient to resist shrinkage comprising reacting
- an aromatic polymeric isocyanate with
- an emulsified polyol mixture at an NCO/OH index of from about 75-125, the polyol mixture comprising
- (a) a polyol formulation comprising from about 10% to about 100% by weight of a polyester polyol or mixtures of polyester polyols having an OH value of from about 150 to 350 and a molecular weight of from about 350 to 700;
- (b) a blowing agent;
- (c) a cell opening agent which is a divalent metal salt of a fatty acid;
- and
- (d) up to about 5% by weight of an acid based on the weight of the polyol mixture.
A pour-in place polyurethane foam comprising from about 0.01 to 0.5% by weight of a cell opening agent which is a divalent metal salt of a fatty acid, the foam having an open-cell content sufficient to resist shrinkage and exhibiting less than about 5% shrinkage when stored at about 158° F. and about 100% relative humidity for about 28 days, the foam comprising the reaction product of
- an aromatic polymeric isocyanate with
- an emulsified polyol mixture at an NCO/OH index of from about 75-125, the polyol mixture comprising
- (a) a polyol formulation comprising from about 10% to about 100% by weight of a polyester polyol or mixtures thereof having an OH value of from about 150 to 350 and a molecular weight of from about 350 to 700;
- (b) a blowing agent;
- (c) a cell opening agent which is a divalent metal salt of a fatty acid;
- and
- (d) up to about 5% by weight of an acid based on the weight of the polyol mixture.
A method for preparing a polymeric foam comprising urethane units and having an open-cell content sufficient to resist shrinkage comprising reacting
- an aromatic polymeric isocyanate with an emulsified polyol mixture at an NCO/OH index of from about 75-125, the polyol mixtures comprising
- (a) a polyol formulation comprising from about 10% to 100% by weight of a modified diethylene glycol phthalate polyester polyol having an OH value of from about 230 to 250, the polyester polyol comprising the reaction product of a phthalic acid compound, a low molecular weight aliphatic diol, and a nonionic surfactant, the polyol having a molecular weight of from about 350 to 700;
- (b) a blowing agent;
- (c) a cell opening agent which is a divalent metal salt of a long chain fatty acid;
- and
- (d) up to about 5% by weight of an alkanoic or alkenoic acids acid based on the weight of the polyol mixture.
Dependencies are inferred from the claim text.