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US 4,362,678 AGranted
Method of making polyisocyanurate foam laminate
AssigneeThe Celotex Corporation
InventorsMichael J. Skowronski, Alberto DeLeon
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Abstract
A process for producing a laminate of polyisocyanurate foam which is the reaction product of a polymethylene polyphenylisocyanate and a polyol which is ethoxylated trimethylol propane, ethoxylated trimethylol ethane, ethoxylated pentaerythritol or ethoxylated glycerin. Laminates of such foams exhibit improved adhesion of the facing sheet.
Claims13
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.
9 more elements
Dependencies are inferred from the claim text.