Blocked urethane prepolymers as paper wet strength agent

Details Blocked urethane prepolymers as paper wet strength agent Blocked urethane prepolymers as paper wet strength agent

D - Textiles, Paper

21

H

D21H 17/57 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) D21H 21/20 (2006.01)

Patent

CA 2353005

Paper with increased wet strength is produced by adding to the stock a water soluble blocked urethane prepolymer having a plurality of blocked isocyanate groups and hydrophilic groups. The blocking agent is a phenol compound having an electron-attracting group at the ortho- or para-position. The blocked urethane prepolymer is capable of unblocking under such conditions that encounter in the drying part of conventional paper making machines.

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