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:
Apr. 06, 1993
Filed:
Nov. 04, 1991
Sagami Chemical Research Center, Tokyo, JP;
Abstract
A polyorganosiloxane having a quaternary salt at its one terminal, of the following formula (I): ##STR1## wherein A is ##STR2## X.sup.- is a counter anion in the quaternary salt; each of R.sup.1 to R.sup.5 which may be the same or different, is an alkyl group, a substituted alkyl group or a phenyl group; Y is a C.sub.1-6 linear or branched bivalent alkylene or oxyalkylene group; and n is an integer of at least 1, provided that when n is 2 or more, each of R.sup.4 and R.sup.5 may be the same or different, wherein each of R.sup.6 to R.sup.8 which may be the same or different, is an alkyl group, a substituted alkyl group or a phenyl group, or R.sup.6 to R.sup.8 together form a ring and/or an unsaturated bond; R is a C.sub.1-6 alkyl group or a phenyl group; m is an integer of from 0 to 3, provided that when m is 2 or 3, R may be the same of different; and each of R.sup.9 to R.sup.11 which may be the same or different, is a phenyl group, a benzyl group or a C.sub.1-6 alkyl group. Such polyorganosiloxane is useful for promoting percutaneous absorption of a drug.