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. 30, 2000
Filed:
Jun. 03, 1998
Masaki Iwasaki, Wakayama, JP;
Tadanori Yoshimura, Wakayama, JP;
Takashi Matsuo, Tokyo, JP;
Koji Yui, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
A cationic group-containing copolymer is provided which possesses excellent thixotropy and exhibits high adsorbability to the skin, hair, etc. and, when incorporated as a thickener in cosmetic articles, manifests a very satisfactory tactile sensation. The cationic group-containing copolymer is characterized in that the viscosity at 25.degree. C. of the aqueous solution prepared by incorporating the copolymer in deionized water at a concentration of 0.5 wt. % is in the range of 0.3-20 Pa.multidot.sec. at a shear rate of 1 sec.sup.-1 and in the range of 0.01-5 Pa.multidot.sec. at a shear rate of 10 sec.sup.-1 and the viscosity at a shear rate of 1 sec.sup.-1 is higher than the viscosity at a shear rate of 10 sec.sup.-1. This cationic group-containing copolymer is obtained by particularly using a cationic group-containing vinyl monomer, a hydrophilic nonionic group-containing vinyl monomer such as N,N-dimethyl (meth)acrylamide or N,N-diethyl (meth)acrylamide, and a cross-linking vinyl monomer containing at least two vinyl groups in the molecular unit thereof as essential component monomers and radically polymerizing the essential component monomers. A thickener made of the copolymer is also disclosed.