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US 2009/0326090 A1Published application
Insulation boards and methods for their manufacture
OwnerJohn B. LETTSinventor
Life of this patent
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Abstract
A method for producing polyisocyanurate insulation foams, the method comprising contacting an A-side stream of reactants that includes an isocyanate with a B-side stream of reactants that include a polyol and a blowing agent, where the blowing agent includes isopentane and n-pentane in a substantial absence of cyclopentane.
Claims14
A method for producing polyisocyanurate insulation foams having dimensional stability, the method comprising:
- providing a blowing agent including isopentane and n-pentane in a substantial absence of cyclopentane, and having an isopentane to n-pentane weight ratio of from 2.7:1 to 1:1;
- first combining and pressurizing a B-side stream of reactants, including a polyol and the blowing agent, under a pressure in excess of about 80 psi and at a temperature in excess of about 10° C.;
- and
- then contacting an A-side stream of reactants that includes an isocyanate with the B-side stream of reactants.
1 more element
A method for producing polyisocyanurate insulation foams, the method comprising:
- high pressure mixing of a B-side stream of reactants, including a polyol and a blowing agent, under a pressure in excess of about 80 psi and at a temperature in excess of about 10° C., wherein the blowing agent agent includes isopentane and n-pentane in a substantial absence of cyclopentane, and wherein the blowing agent has an isopentane to n-pentane weight ratio of from 2.7:1 to 1:1;
- and
- then contacting an A-side stream of reactants that includes an isocyanate with the B-side stream of reactants.
Dependencies are inferred from the claim text.