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US 2011/0015289 A1Published application
Insulation boards and methods for their manufacture
AssigneeFirestone Building Products Company, LLC
InventorJohn B. LETTS
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.
Claims13
A method for producing polyisocyanurate insulation foams, the method comprising:
- (i.) providing a blowing agent including isopentane and n-pentane in the substantial absence of cyclopentane, where the isopentane to n-pentane weight ratio of from 1.5:1 to 1:1;
- (ii.) providing a polyol stream;
- (iii.) combining the polyol stream and the blowing agent to form a B-side stream, where the B-side stream includes about 10 to about 40 parts by weight blowing agent per 100 parts by weight polyol, and where said step of combining takes place under a pressure in excess of 80 psi and at a temperature in excess of about 10° C.;
- (iv.) after said step of combining, increasing the pressure of the B-side stream to a pressure of about 1800 to about 2400 psi;
- (v.) providing an A-side stream including an isocyanate;
- (vi.) increasing the pressure of the A-side stream to a pressure of about 1800 to about 2400 psi;
- and
- (vii.) mixing the A-side stream with the B-side stream within a mix head.
5 more elements
A method for producing polyisocyanurate insulation foams, the method comprising:
- (i.) mixing a polyol and a blowing agent to form a B-side stream, where said step of mixing takes place 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 1.5:1 to 1:1, and wherein the amount of blowing agent employed is from about 10 to about 40 parts by weight blowing agent per 100 parts by weight polyol;
- (ii.) increasing the pressure of the B-side stream to about 1,800 to about 2,400 psi and heating the B-side stream of reactants to a temperature of about 16° C. to about 29° C.;
- (iii.) after said steps of increasing the pressure and heating, delivering the B-side stream to a mix head;
- (iv.) delivering an A-side stream that includes an isocyanate at a pressure of about 1,800 to about 2,400 psi to a mix head;
- and
- (v.) contacting the A-side stream and the B-side stream within the mix head.
3 more elements
Dependencies are inferred from the claim text.