Two-component, primerless, urethane-isocyanurate adhesive...

Details Two-component, primerless, urethane-isocyanurate adhesive... Two-component, primerless, urethane-isocyanurate adhesive...

C - Chemistry, Metallurgy

08

G

C08G 18/16 (2006.01) B32B 7/12 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/18 (2006.01) C08G 18/22 (2006.01) C08G 18/38 (2006.01) C08L 75/04 (2006.01) C09J 175/04 (2006.01)

Patent

CA 2084181

A two-component polyurethane composition has good shelf stability and the adhesive made by curing the same has good high temperature stability and no adhesion loss after high temperature bake. The base or pre- polymer component containing a primary hydroxyl interme- diate also has a sufficiently large excess of free isocyanate so that the ratio of free NCO groups in the prepolymer component to OH curative groups plus any amine groups in the curative component is generally from about 1.2 to about 2Ø The curative component contains a trimerization catalyst so that upon cure, isocyanurate units are produced. The system also contains molecular sieves, as well as phosphorous-type adhesion promoters.

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