Rigid foams using CHClF.sub.2 as a blowing agent
AssigneeFoam Supplies, Inc.
InventorsDavid G. Keske, Mark S. Schulte
Life of this patent
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Abstract
A method for preparation of rigid foam disclosed. The method comprises mixing at least two components to form a reaction mixture. The reaction mixture comprises isocyanate, up to about 20% by weight CHClF.sub.2, up to about 2% by weight of water, and a combination of polyols having an average OH number of from about 300 to about 500 and comprising polyalkoxylated glycerin having an OH number of from about 200 to about 300 and in which the alkoxy groups each have from two to about three carbon atoms. Related methods and compositions are also disclosed.
Claims30
A method for preparation of rigid polyurethane foam, comprising mixing at least two components to form a reaction mixture comprising:
- (a) isocyanate,
- (b) from about 1% to about 20% by weight CHClF.sub.2,
- (c) up to about 2% by weight of water, and
- (d) a combination of polyols having an average OH number of from about 300 to about 500 and comprising olyalkoxylated glycerin having an OH number of from about 200 to about 300 and in which the alkoxy groups each have from two to about three carbon atoms.
A method for preparation of rigid foam, comprising mixing a component A with a component B, component A comprising isocyanate, from about 0.5% by weight to about 12% by weight CHClF.sub.2 based on total component A, and a surfactant, and component B comprising
- (a) from about 65% by weight to about 95% by weight, based on total component B, of a combination of polyols comprising a first polyol constituent, which comprises a polyalkoxylated amine having an average OH number of from about 500 to about 700 and in which the alkoxy groups each have from two to three carbon atoms, a second polyol constituent, which comprises a sucrose-based polyol having an average OH number of from about 300 to about 400 and an average functionality of at least about 3, and a third polyol constituent, which comprises polyalkoxylated glycerin having an average OH number of from about 200 to about 300 and in which the alkoxy groups each have from two to three carbon atoms;
- (b) from about 0.5% by weight to about 3% by weight of water, based on total component B;
- (c) up to about 5% by weight of water/isocyanate reaction catalyst, based on total component B;
- and
- (d) from about 1% by weight to about 15% by weight of CHClF.sub.2, based on total component B.
A rigid foam produced by mixing a component A with a component B, component A comprising isocyanate, from about 0.5% by weight to about 12% by weight CHClF.sub.2 based on total component A, and a surfactant, and component B comprising
- (a) from about 65% by weight to about 95% by weight based on total component B of a combination of polyols comprising a first polyol constituent, which comprises a polyalkoxylated amine having an average OH number of from about 500 to about 700 and in which the alkoxy groups each have from two to three carbon atoms, a second polyol constituent, which comprises a sucrose-based polyol having an average OH number of from about 300 to about 400 and an average functionality of at least about 3, and a third polyol constituent, which comprises polyalkoxylated glycerin having an average OH number of from about 200 to about 300 and in which the alkoxy groups each have from two to three carbon atoms;
- (b) from about 0.5% by weight to about 3% by weight of water, based on total component B;
- (c) up to about 5% by weight of water/isocyanate reaction catalyst, based on total component B;
- and
- (d) from about 1% by weight to about 15% by weight of CHClF.sub.2, based on total component B.
A rigid foam produced by mixing at least two components to form a reaction mixture comprising:
- (a) isocyanate,
- (b) from about 2% by weight to about 10% by weight CHClF.sub.2,
- (c) from about 0.25% by weight to about 2% by weight of water, and
- (d) a combination of polyols having an average OH number of from about 300 to about 500 and comprising polyalkoxylated glycerin having an average OH number of from about 200 to about 300 and in which the alkoxy groups each have from two to about three carbon atoms.
A rigid foam comprising cells of gaseous CHClF.sub.2, having a closed cell content of at least 85% and exhibiting less than 5% volume change when cooled from room temperature to -200.degree. F.
Dependencies are inferred from the claim text.