Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1988-01-29
1989-05-02
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 21, 528 26, 528 28, 528 31, 528 33, 528 38, 534726, C08G 7706, C08G 7704
Patent
active
048269549
ABSTRACT:
Novel diorganopolysiloxane-azobenzene alternating copolymers composed of repeat units having the formula ##STR1## wherein n has a value greater than or equal to 1; each R.sup.1 is independently selected from a group consisting of a hydrogen atom, a monovalent hydrocarbon group and an alkoxy group; each R.sup.2 is independently selected from a group consisting of a monovalent hydrocarbon group and an alkoxy group; each R.sup.3 is a linking group selected from a group consisting of an oxygen atom, C.sub.2 -C.sub.6 alkylene groups, --O(C.dbd.O)--, --R.sup.4 --N(R.sup.5)--(C.dbd.O)--, and --R.sup.6 --(C.dbd.O)--N(R.sup.7)--, are described. These copolymers undergo reversible photomediated changes in their viscosity and absorption specta. Also described are methods for preparing these novel copolymers.
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patent: 4189546 (1980-02-01), Deichert
patent: 4358391 (1982-11-01), Finkelmann
Neckers, Mechanistic Organic Photochemistry, Reinhold Publishing, 1967, pp. 72-75.
Irie Masahiro
Suzuki Toshio
Bleutge John C.
Dean Jr. R.
Toray Silicone Co. Ltd.
Yorimoto Carl A.
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