Modified protein adhesive binder and method of producing

Details Modified protein adhesive binder and method of producing Modified protein adhesive binder and method of producing

D - Textiles, Paper

21

H

6/57

D21H 19/50 (2006.01) C08H 1/00 (2006.01)

Patent

CA 1198554

Abstract of the Disclosure A modified vegetable protein adhesive binder and a process for producing the same is disclosed wherein an alkaline protein dispersion is formed of the protein material and said dispersion is treated with a reducing agent in an amount sufficient to react with the disulfide bonds of the protein material in said dispersion. Initial treatment of the protein material with a reducing agent is followed by reaction of the treated dispersion with a carboxylic acid anhydride such as dicarboxylic acid anhydride, pre- ferably phthalic anhydride in an amount sufficient to modify the pro- tein material such that resultant alkali dispersions of the modified unhydrolyzed protein material have a relatively high viscosity but when used in paper coating compositions containing pigment and other materials such as latex produce relatively low and desirable coating viscosities. Improvements in pick strength, gloss, water holding and ink receptivity of coatings produced with the modified binder of the present invention is achieved.

438973

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