Push button switch covering member of silicone rubber with prote

Details Push button switch covering member of silicone rubber with prote Push button switch covering member of silicone rubber with prote

1996-03-29

1998-09-08

Nakarani, D. S.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

200333, 4284255, B32B 2520, B32B 2740

Patent

active

058042997

ABSTRACT:
A push button switch covering member of a silicone rubber is imparted with excellent resistance against stain deposition and abrasive wearing by providing a protective overcoating layer of a urethane resin-based coating composition capable of being cured by forming urethane linkages between isocyanate groups of a polyisocyanate compound and hydroxy groups of a polyhydroxy compound. The coating procedure with the coating composition on the surface of a silicone rubber-made covering member is preceded by a plasma treatment so as to activate the surface resulting in an increased adhesive bonding strength between the silicone rubber body and the coating layer. The improvement is more remarkable when the plasma-activated surface is subjected to a priming treatment with a silane coupling agent and coating with the coating composition is undertaken as soon as possible or within 60 minutes after completion of the plasma treatment.

REFERENCES:
patent: 4312693 (1982-01-01), Salensky et al.

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