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. 06, 1976
Filed:
May. 13, 1974
Masao Hasegawa, Tokyo, JA;
Akihisa Furuno, Yokohama, JA;
Haruhiko Ishikawa, Yokohama, JA;
Yasuo Ogawa, Kawasaki, JA;
Nitto Chemical Industry Co., Ltd., Tokyo, JA;
Abstract
A process for producing a partially hydrolyzed polyacrylamide which has a high molecular weight and high water solubility and can be suitably used as a flocculant for water treatment and a size for paper manufacture comprising polymerizing an aqueous solution of an acrylamide monomer in the presence of an alkali metal hydroxide such as sodium hydroxide and boric acid, whereby a partial hydrolysis of the polymer formed is also conducted substantially simultaneously with the polymerization. In an additional embodiment, a maturing of the polyacrylamide produced can be conducted by continuing to heat the polymer solution to increase the hydrolysis percentage.