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:
Aug. 05, 1986
Filed:
Nov. 22, 1985
Dodd W Fong, Naperville, IL (US);
Claudia C Pierce, Naperville, IL (US);
David A Grattan, Lagrange Highlands, IL (US);
Nalco Chemical Company, Oak Brook, IL (US);
Abstract
The invention comprises a method of preparing copolymers of acrylamido sulfonic acids which comprises converting to acrylamido sulfonic groups at least 5 mole % of the acrylic acid or methacrylic acid groups in a polymer which contains at least 5 mole % of these monomers in its structures by reacting an aqueous solution of the acrylic acid or methacrylic acid polymer with an amino sulfonic acid under pressure at a temperature of at least 70.degree. C. for a period of time sufficient to convert at least 5 mole % of the acrylic acid or methacrylic acid groups in the polymer to amido sulfonic acid groups corresponding to the starting amino sulfonic acid.