HIGH MODULUS, NON-CONDUCTIVE ADHESIVE BASED ON POLYURETHANE PREPOLYMER, USEFUL FOR INSTALLING VEHICLE WINDOW

摘要

PROBLEM TO BE SOLVED: To provide a composition useful for attaching glass in a vehicle and building.SOLUTION: This invention relates to a composition, comprising: (a) one or more isocyanate functional polyether-based prepolymers containing one or more organic-based polymers dispersed therein; (b) one or more isocyanate functional polyester-based prepolymers which is solid at 23°C; (c) one or more polyisocyanates having a nominal functionality of about 3 or greater; (d) one or more conductive carbon blacks in an amount such that the composition has a dielectric constant of about 15 or less; and (e) one or more catalysts for the reaction of isocyanate moieties with hydroxyl groups, wherein the composition demonstrates upon cure a modulus of 2.0 MPa or greater at 25°C measured according to ASTM D4065; a dielectric constant of about 15 or less; a sag of an uncured sample of less than 2 mm; a press flow viscosity of about 20 to about 50; and a storage modulus of about 5.3×10Pa or greater.