Patent ID: 6270860
Filing Date: 2001-08-07
Classification: C08J,Y10T

Abstract:
A method for the preparation of a push button switch covering member of a silicone rubber provided with a protective overcoating layer which comprises the steps of:(a) exposing the outwardly facing surface of a push button switch covering member made from a silicone rubber to a plasma generated in an atmosphere of a gas so as to activate the surface;(b) coating the thus plasma-activated surface of the push button switch covering member made from a silicone rubber with a reactive organic resin-based coating composition curable by forming crosslinks of urethane linkages between isocyanate groups of a polyisocyanate compound and hydroxy groups of a polyhydric organic compound to form a coating layer of the coating composition; and(c) subjecting the coating layer of the coating composition to curing.