Wet strength resins having reduced levels of organic halogen...

Details Wet strength resins having reduced levels of organic halogen... Wet strength resins having reduced levels of organic halogen...

C - Chemistry, Metallurgy

08

G

C08G 69/48 (2006.01) C08G 73/02 (2006.01) D21H 17/55 (2006.01) D21H 21/20 (2006.01)

Patent

CA 2165269

Wet strength resins for paper are prepared by a process comprising the following steps in sequence: (1) reacting a polyamidoamine with an epihalohydrin until the amount of unreacted epihalohydrin present is less than about 10% by weight of the amount of epihalohydrin charged, (2) adding a water-soluble, nonpolymeric amine in an amount of about 0.1 to about 50 mole %, based on the amine in the polyamidoamine, and (3) heating to effect crosslinking. An optional amine additive reaction step can be included after step (2). A nonhalogen acid such as sulfuric acid can be added toward the end of the crosslinking step to decrease the total organic halogen content and increase the wet strengthening effectiveness.

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