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Insulation boards and methods for their manufacture

  • US 7,612,120 B2
  • Filed: 08/13/2003
  • Issued: 11/03/2009
  • Est. Priority Date: 08/13/2002
  • Status: Active Grant
First Claim
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1. A method for producing isocyanurate insulation foams, the method comprising:

  • (i) forming a B-side stream of reactants including a polyol and a blowing agent blend, where the blowing agent blend includes isopentane and n-pentane at a weight ratio of isopentane to n-pentane of about 1;

    1 to about 2.7;

    1 in the substantial absence of cyclopentane, where said step of forming includes introducing the polyol and the blowing agent within a pin mixer under a pressure in excess of about 80 psi and a temperature in excess of about 10°

    C.;

    (ii) increasing the temperature of the B-side stream of reactants to a temperature of about 16°

    C. to about 29°

    C. and a pressure of about 1800 psi to about 2400 psi;

    (iii) after said step of increasing, delivering the B-side stream of reactants to a mix head, where the temperature of the B-side stream of reactants is increased to about 27°

    C. to about 35°

    C.;

    (iv) introducing an A-side stream of reactants to the mix head at a temperature of about 29°

    C. to about 35°

    C. and a pressure of about 1800 to about 2400 psi to thereby mix with the B-side stream and form a mixture of polyisocyanurate ingredients;

    (v) depositing the mixture of polyisocyanurate ingredients onto a laminator and allowing the mixture of polyisocyanurate ingredients to form a developing foam.

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