Fireproof laminates

Claim 1

A fireproof laminate comprising a urethane modified polyisocyanurate foam as a core material produced by reacting an organic polyisocyanate with a polyol in the presence of an isocyanate trimerization catalyst, a blowing agent and other additives, and a surface material piled on at least front surface of said core material, which comprises: (1) using an aluminum foil with a thickness of not less than 0.015 mm as a front surface material for said core material, said front surface material being united with said core material by self-adhesion of said foam; (2) using, as said polyol for the formation of said urethane modified polyisocyanurate foam, at least one low molecular weight diol (hereinafter referred to as A-group diol) selected from the group consisting of (a) compounds having the general formula HO--CH.sub.2 CH.sub.2 O).sub.n H, wherein n is 2, 3 or 4, (b) compounds having the general formula ##STR4## wherein n is 2 or 3, (c) 2,3-butane diol and (d) 2-butene-1,4-diol together with at least one high molecular weight polyol (hereinafter referred to as B-group polyol) having 2 to 4 hydroxyl groups in its molecule and a hydroxyl equivalent of 600 to 2,000; (3) being a weight ratio of the sum of A-group diols to the sum of B-group polyols within a range of 0.55 to 7.0; and (4) being a total amount of A-group diols and B-group polyols used as said polyol within a range of 12.5 to 25 parts by weight per 100 parts by weight of said organic polyisocyanate.