The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 02, 1989
Filed:
Jan. 29, 1988
Toshio Suzuki, Kimitsu, JP;
Masahiro Irie, Osaka, JP;
Toray Silicone Co., Ltd., Tokyo, JP;
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.