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
1996-11-05
1998-06-23
Sergent, Rabon
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...
156 99, 156107, 264216, 264252, 264259, 264261, 264275, 264277, 264279, 277 97, 277237R, 277277, 277DIG9, 428 38, 428 81, 428 83, 428192, 528 49, 528 59, 528 60, 528 61, 528 65, 528 66, 528 68, 528 76, 528 77, 528 85, 296201, C08G 1879, C08G 1840, C08G 1848, B65D 5306
Patent
active
057706743
ABSTRACT:
The present invention is directed to a method of forming a gasket around a substrate from a novel polyurethane/urea composition via the RIM process. Window gaskets may be produced by this method. These novel polyurethane/urea compositions comprise the reaction product of a (cyclo)aliphatic polyisocyanate having a viscosity of less than about 25,000 mPa.multidot.s at 25.degree. C. and a NCO functionality of 2.0 to 4.0 with an isocyanate-reactive component comprising b1) a relatively high molecular weight organic compound containing hydroxyl groups, amine groups, or mixtures thereof; and b2) a low molecular weight chain extender selected from the group consisting of diols, primary amines, secondary amines, aminoalcohols, and mixtures thereof; in the presence of a catalyst. The isocyanate and isocyanate-reactive components are selected such that the crosslinking density of the resultant polyurethane/urea composition is at least 0.3 moles/kg. It is also possible that the isocyanate-reactive component comprises b3) a low molecular weight chain terminator, and/or b4) a low molecular weight crosslinking agent. When either or both of these components are included in the isocyanate-reactive component, A, b1), b2), and/or b3) and/or b4) must be selected such that the crosslinking density of the resultant polyurethane/urea composition is at least 0.3 moles/kg.
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Cageao Ronald A.
Meltzer A. Donald
Suddaby Brian R.
Bayer Corporation
Brown N. Denise
Gil Joseph C.
Sergent Rabon
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