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:
Oct. 02, 2001
Filed:
Aug. 30, 1999
Showa Denko K.K., Tokyo, JP;
Abstract
A cement admixture that includes a copolymer obtained by polymerizing (A) 10 to 85% by weight of N-vinylacetamide or a monomer derived therefrom, (B) 10 to 90% by weight of an (alkoxy)polyethylene glycol (meth)acrylate or (alkoxy)polyethylene glycol (meth)allyl ether monomer, (C) 5 to 50% by weight of a vinyl monomer containing one carboxylic acid group, at least one sulfonic acid group or salt thereof in a molecule, and (D) 0 to 40% by weight of a vinyl monomer other than (A), (B) and (C), provided that the sum of monomers (A), (B), (C) and (D) is 100% by weight. The cement admixture by itself can impart a cement composition with flowability, flowability maintenance ability, packing property and resistance to segregation in good balance, and is effective in improvement of workability, operability, and quality of hardened article.