Catalyst mixtures for polyisocyanurate foam
AssigneeThe Celotex Corporation
InventorsThomas G. Soukup, John P. Oliver
Life of this patent
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Abstract
Rigid polyisocyanurate foams are prepared by (a) bringing together on a continuously advancing conveyor an organic polyisocyanate, a minor amount of a polyester polyol, a blowing agent and, in an organic solvent, a catalyst mixture comprising: (i) a salt of a low molecular weight carboxylic acid selected from the group consisting of an alkali metal salt and an alkaline earth metal salt and mixtures thereof, and (ii) a tertiary amine, the amount of the salt of the low molecular weight carboxylic acid being sufficient and the molecular weight of the carboxylic acid of the salt being sufficiently low to provide a firm foam having a non-friable surface, and (b) foaming the foam-forming mixture.
Claims30
A continuous process for producing a rigid polyisocyanurate foam which comprises:
- (a) bringing together on a continuouly advancing conveyor an organic polyisocyanate, a minor amount of a polyester polyol, a blowing agent and, in an organic solvent, a catalyst mixture comprising (i) a salt of a low molecular weight carboxylic acid selected from the group consisting of an alkali metal salt and an alkaline earth metal salt and mixtures thereof, (ii) a salt of a higher molecular weight carboxylic acid selected from the group consisting of an alkali metal salt and an alkaline earth metal salt and mixtures thereof, the higher molecular weight carboxylic acid having from about 5 to 30 carbon atoms, and (iii) a tertiary amine, and
- (b) forming the foam-forming mixture.
A rigid polyisocyanurate foam comprising the reaction product of an organic poly isocyanate, a minor amount of a polyester polyol, a blowing agent, and, in an organic solvent, a catalyst mixture comprising:
- (a) a salt of a low molecular weight carboxylic acid selected from the group consisting of an alkali metal salt and an alkaline earth metal salt and mixtures thereof,
- (b) a salt of a higher molecular weight carboxylic acid selected from the group consisting of an alkali metal salt and an alkaline earth metal salt and mixture thereof, the higher molecular weight carboxylic acid having from about 5 to 30 carbon atoms, and
- (c) a tertiary amine.
The polyisocyanurate foam of claim 18 wherein the alkali metal salt of the low molecular weight carboxylic acid is potassium acetate, the alkali metal salt of the higher molecular weight carboxylic acid is potassium octoate, and the tertiary amine is 2,4,6-tris(dimethylaminomethyl) phenol.
A process for producing a laminate of a rigid polyisocyanurate foam comprising:
- (a) contacting at least one continuously advancing facing sheet with a polyisocyanurate foam-forming mixture comprising an organic polyisocyanate, a minor amount of a polyester polyol, a blowing agent and, in an organic solvent, a catalyst mixture comprising (i) a salt of a low molecular weight carboxylic acid selected from the group consisting of an alkali metal salt and an alkaline earth metal salt and mixtures thereof, (ii) a salt of a higher molecular weight carboxylic acid selected from the group consisting of an alkali metal salt and an alkaline earth metal salt and mixtures thereof, and the higher molecular weight carboxylic acid having from about 5 to 30 carbon atoms, and (iii) a tertiary amine, and
- (b) foaming the foam-forming mixture.
A laminate comprising at least one facing sheet adhered to a rigid polyisocyuanurate foam comprising the reaction product of an organic polyisocyanate, a minor amount of a polyester polyol, a blowing agent, and, in an organic solvent, a catalyst mixture comprising:
- (a) a salt of a low molecular weight carboxylic acid selected from the group consisting of an alkali metal salt and an alkaline earth metal salt and mixtures thereof,
- (b) a salt of a higher molecular weight carboxylic acid selected from the group consisting of an alkali metal salt and an alkaline earth metal salt and mixtures thereof, the higher molecular weight carboxylic acid having from about 5 to 30 carbon atoms, and
- (c) a tertiary amine.
A catalyst mixture comprising (i) a salt of a low molcular weight carboyxlic acid selected from the group consisting of an alkali metal salt and an alkaline earth metal salt and mixtures thereof, (ii) a salt of a higher molecular weight carboxylic acid selected from the group consisting of an al;kali metal salt and an alkaline eath metal salt and mixtures thereof, the higher molecular weight carboxylic acid having from about 5 to 30 carbon atoms, and (iii) a tertiary amine.
Dependencies are inferred from the claim text.