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:
Jul. 21, 1992
Filed:
Jul. 10, 1991
Naotaka Watanabe, Tokyo, JP;
Takeo Arai, Yokohama, JP;
Hitoshi Fujiyoshi, Yokohama, JP;
Masako Shirota, Yokohama, JP;
Mitsui-Cyanamid, Ltd., Tokyo, JP;
Abstract
A polymer emulsion capable of becoming water swellable is provided by mixing a monomer represented by the general formula ##STR1## (wherein R.sub.1 indicates H or CH.sub.3, R.sub.2 and R.sub.3 indicate an alkyl radical represented by CnH.sub.2N+1 in which n is a positive integer, A indicates --O--CH.sub.2 -- or --NH--CH.sub.2 --CH.sub.2 --, and R.sub.1, R.sub.2 and R.sub.3 are selected within the range wherein the monomer exhibits sparing solubility or insolubility in water) with a crosslinking agent and optionally with another vinyl monomer capable of copolymerization therewith, and emulsion polymerizing the so-obtained mixture in water. The so obtained a polymer can be made water swellable by reaction with an acid, a salt or a quaternizing agent.