Raychem Limited

Larry J White

Philip J Jones

A Brian Macknick

Alan J Gotcher

Paul B Germeraad

A display presenting an image having enhanced contrast has a screen which switches between a bright, image-presenting state and a dark, image-less state, to minimize glare from ambient light reflections. Alternatively, a shutter which switches between a substantially transparent state and a dark, light absorbing state is placed over a conventional screen.

Displays having improved contrast

Compounds useful as crosslinking agents have the formula: ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 and R.sub.4 are independently vinyl, allyl, methallyl, propargyl, crotyl, C.sub.1 to C.sub.18 alkyl, aryl or inert group substituted derivatives thereof and where X is a saturated or unsaturated alkylene moiety having up to 12 carbon atoms saturated or unsaturated C.sub.1 -C.sub.18 heteroaliphatic, C.sub.5 -C.sub.18 heteroaromatic, C.sub.5 -C.sub.18 alicyclic or C.sub.1 -C.sub.18 heterocyclic, where n and m are independently 0 or integers of from 1-12 inclusive. These compounds are particularly useful as crosslinking agents for high temperature processable (&gt;200.degree.) polymers, especially fluorocarbon polymers. Also described are polymer compositions comprising from about 0.1 weight percent to about 50 weight percent of said crosslinking agent or mixture of said crosslinking agents. The products resulting from melt fabrication and subsequent crosslinking of such compositions are useful as shaped articles, e.g., wire products. Most of said compounds are novel compositions of matter.

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Newark, CA, United States of America

Larry J White