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:
Jan. 06, 1976
Filed:
Aug. 21, 1974
Thomas Aitken, Chicago, IL (US);
Nalco Chemical Company, Oak Brook, IL (US);
Abstract
A cationic additive for starch which comprises a preferred condensate of epichlorohydrin with an equimolar quantity with dimethylamine, and in which a minor amount of up to 30 percent molar ammonia may be substituted for a like molar amount of dimethylamine. This condensate is preferably intimately admixed and utilized in an amount of 1-7 percent (preferred 5-7 percent) with alkaline gelatinized or alkali hydrolyzed starch to give a liquid cationic treating agent for paper. The percentage of condensate additive is calculated using as a base granular or dry starch and the condensate is preferably added to the liquid gelatinous starch after the gelatinization or in situ during the gelatinization. The starch, during the addition of the condensate, is maintained alkaline by a preferred alkali metal hydroxide of about 5 percent strength. This cationic starch may be used as a wet end pulp additive in the range 3-50 lbs/ton and has shown to favorably affect burst strength and pigment retention values.