Process for producing prepolymers which cure to improved sealant

Details Process for producing prepolymers which cure to improved sealant Process for producing prepolymers which cure to improved sealant

1998-01-22

1999-11-23

Sergent, Rabon

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 29, 528 59, 528 69, 556414, 556420, C08G 1871, C08G 1810, C08G 7718, C08G 7726

Patent

active

059902574

ABSTRACT:
Silylated polyurethanes exhibiting a superior combination of mechanical properties and which cure in reasonable time to a low-tack sealant, without excessive viscosity, are prepared by reacting a polyol component having terminal unsaturation of less than 0.2 meq/g with a diisocyanate component to form a hydroxyl-terminated prepolymer, and endcapping the prepolymer with an isocyanate silane of the formula OCN--R--Si--(X).sub.m (--OR.sup.1).sub.3-m wherein m is 0, 1 or 2, each R.sup.1 is alkyl containing 1 to 4 carbon atoms, each X is alkyl containing 1 to 4 carbon atoms, and R is a difunctional organic group.

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