초록

Improved adhesion between the skin and core of laminates having rigid polyisocyanurate foam cores is obtained by incorporating a dipolar aprotic organic solvent, in minor amount, into the reaction mixture employed to prepare the polyisocyanurate foam core.

대표청구항 ▼

In a process for the preparation of a foam-cored laminate having metal facers and rigid polyisocyanurate foam as the core material the improvement which comprises lowering the cure temperature necessary to assure good adhesion between metal facer and foam core by incorporating, into the polyisocyanu

In a process for the preparation of a foam-cored laminate having metal facers and rigid polyisocyanurate foam as the core material the improvement which comprises lowering the cure temperature necessary to assure good adhesion between metal facer and foam core by incorporating, into the polyisocyanurate foam forming reaction mixture which is employed to prepare the foam core, a dipolar aprotic solvent in an amount from about 1 percent by weight to about 10 percent by weight based on total weight of the foam forming mixture.