Base film for membrane switch and membrane switch

Details Base film for membrane switch and membrane switch Base film for membrane switch and membrane switch

2006-04-04

2006-04-04

Chen, Vivian (Department: 1773)

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

C428S212000, C428S332000, C428S337000, C428S339000, C428S480000, C428S690000, C428S910000, C524S115000, C524S123000, C524S126000, C524S147000, C524S394000, C524S398000, C177S136000, C177S144000, C177S2100EM, C280S735000, C200S08500R, C200S08500R, C200S512000

Reexamination Certificate

active

07022397

ABSTRACT:
There is provided a membrane switch film comprising polyethylene 2, 6-naphthalenedicarboxylate as the major component and having excellent handling properties and durability, and particularly a film which is suitable for a membrane switch to be used in automobile interior devices which are potentially exposed to high temperature. The film is a membrane switch film having a refractive index in the range of 1.770–1.790 on both surfaces in either or both the film processing direction and the widthwise direction and an absolute value of no greater than 0.015 for the difference between the refractive indexes of both surfaces.

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