Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1991-12-09
1992-12-29
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528 49, 528 50, 528 51, 528905, 4284228, 524706, 524789, C08G 1808, C08G 1810
Patent
active
051752280
ABSTRACT:
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 temperture bake. The base or prepolymer component containing a primary hydroxyl intermediate 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 2.0. 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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Cocain H. William
Melby Earl G.
Wang Chia L.
GenCorp Inc.
Johnson Rachel
Welsh Maurice J.
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