Method of making polyisocyanurate foam laminate

Claim 2

A process for producing a laminate comprising: (I) contacting at least one facing sheet with a polyisocyanurate foam-forming mixture comprising: (A) a polymethylene polyphenylisocyanate; (B) a polyol having the formula: ##STR1## wherein m is 0 or 1, R is hydrogen, hydroxyl, lower alkyl or a radical having the formula: H--(OCH.sub.2 CH.sub.2).sub.d --OCH.sub.2 --, the sum of a+b+c+d is between 2.0 and 8.0, and the equivalent ratio of A:B is 2:1 to 6:1; (C) a catalyst; (D) a blowing agent; and (E) a surfactant; and (II) foaming said foam-forming mixture.

Claim 3

The process of claim 1 wherein the polyol has the formula: ##STR2## wherein m is 0 or 1, R is hydrogen, lower alkyl, or a radical having the formula: H--(OCH.sub.2 CH.sub.2).sub.d --OCH.sub.2 --, and the sum of a+b+c+d is between 2.0 and 8.0.

Claim 4

The process of claim 2 wherein the polyol is a member selected from the group consisting of ethoxylated trimethylol propane, ethoxylated trimethylol ethane, ethoxylated pentaerythritol and ethoxylated glycerin.

Claim 5

The process of claim 2 wherein the polymethylene polyphenylisocyanate is a mixture of polyisocyanates having the formula: ##STR3## wherein the mixture has: (a) a functionality of 2.1 to 3.2, (b) an equivalent weight between 120 and 180, (c) a viscosity at 25° C. between 150 and 2500 centipoises, and (d) n is an integer from 0 to 8 inclusive.

Claim 6

The process of claim 4 wherein the polyol is a member selected from the group consisting of ethoxylated trimethylol propane, ethoxylated trimethylol ethane, ethoxylated pentaerythritol and ethoxylated glycerin.

Claim 7

The process of claim 4 wherein the polyol is ethoxylated trimethylol propane.

Claim 8

The process of claim 2 or 5 wherein the polyol has an equivalent weight of 60 to 170.

Claim 9

The process of claim 7 wherein the polyol has an equivalent weight of 75 to 125.

Claim 10

The process of claim 8 wherein the polyol is a member selected from the group consisting of ethoxylated trimethylol propane, ethoxylated pentaerythritol and ethoxylated glycerin.

Claim 11

The process of claim 8 wherein the polyol is ethoxylated trimethylol propane.

Claim 12

The process of claim 1 for producing a laminate comprising: (I) contacting at least one facing sheet with a polyisocyanurate foam-forming mixture comprising: (A) a polymethylene polyphenylisocyanate which is a mixture of polyisocyanates having the formula: ##STR4## wherein the mixture has: (a) a functionality of 2.1 to 3.2, (b) an equivalent weight between 120 and 180, (c) a viscosity at 25° between 150 and 2500 centipoises, and (d) n is an integer from 0 to 8 inclusive; (B) a polyol which is a member selected from the group consisting of ethoxylated trimethylol propane, ethoxylated trimethylol ethane, ethoxylated pentaerythritol and ethoxylated glycerin and has an equivalent weight of 75 to 125; (C) a catalyst; (D) a blowing agent; and (E) a surfactant; wherein the equivalent ratio of A:B is 2:1 to 6:1, C comprises from 1 to 5 weight percent of the reaction mixture, D comprises 5 to 20 weight percent of the reaction mixture, and E comprises 0.1 to 2 weight percent of the reaction mixture; and (II) foaming said foam-forming mixture.

Claim 13

The process of claim 4 or 11 wherein: (A) the polyol is a member selected from the group consisting of ethoxylated trimethylol propane, ethoxylated pentaerythritol and ethoxylated glycerin and has an equivalent weight of 75 to 125; (B) the catalyst is a mixture of 2,4,6-tris(dimethylaminomethyl) phenol and potassium octoate; (C) the blowing agent is trichlorofluoromethane; and (D) the surfactant is a silicone surfactant.

Claim 14

The process of claim 12 wherein the polyol is ethoxylated trimethylol propane.