Method of paper sizing using modified cationic starch

Details Method of paper sizing using modified cationic starch Method of paper sizing using modified cationic starch

D - Textiles, Paper

21

H

D21H 17/29 (2006.01) C08B 31/12 (2006.01) D21H 17/15 (2006.01) D21H 17/16 (2006.01) D21H 21/16 (2006.01) D21H 23/04 (2006.01) D21H 23/26 (2006.01)

Patent

CA 2176875

A paper size composition comprising an aqueous dispersion of: a) a cyclic dicarboxylic acid anhydride containing hydrophobic substitution, and b) a cationic, non-degraded starch which is further modified to a DS of from about 0.005 to 0.4 with either: i) an ether group, R - O - where R is an hydroxyalkyl or alkyl of 1 to 4 carbon atoms, or alkenyl of 2 to 4 carbon atoms, or ii) an ester group, Image where R is an alkyl of 1 to 4 carbon atoms or alkenyl of 2 to 4 carbon atoms, and wherein the non-degraded, fully modified starch has a viscosity of at least 1,000 cPs at 30°C in an 8% aqueous solution The invention also involves the method of sizing paper products using the above described size composition.

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