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:
Feb. 15, 2005
Filed:
Aug. 08, 2003
Antti Likitalo, Turku, FI;
Jouko Käki, Turku, FI;
Antti Likitalo, Turku, FI;
Jouko Käki, Turku, FI;
Ciba Specialty Chemicals Corporation, Tarryton, NY (US);
Abstract
The invention relates to a method for producing starch solutions of high cation equivalent value (with a DS of 0.1-1.0). The starch to be cationized, advantageously an oxidized starch, is slurried to form a suspension of about 10-80% solids content in an aqueous mixture of a cationizing agent. In the cationization 2,3-epoxypropyltrimethylammonium chloride or an equivalent chlorohydrin-functional cationizing agent is used by about 90-1100 g per kg starch solids, and a catalyst is added to the slurry. The reaction is carried out at a high solids content of 40-80%, preferably 50-60%, in at least two successive steps, in the first of which a temperature of about 5-40° C. is maintained, and in the second step a temperature of about 70-180° C.