Treatment of resins to lower levels of cpd-producing species...

Details Treatment of resins to lower levels of cpd-producing species... Treatment of resins to lower levels of cpd-producing species...

C - Chemistry, Metallurgy

08

G

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

Patent

CA 2526093

A process for treating a composition containing a polyamine- epihalohydrin resin that has a low level of CPD-producing species and good gelation stability is disclosed. A polyamine-epihalohydrin resin is prepared with a ratio of epihalohydrin: amine of less than about 1.1:1.0; The resin is then subjected to a base treatment followed by an acid treatment resulting in a resin that has good gelation storage stability and produces low levels of CPD.

L'invention concerne un procédé pour traiter une composition contenant une résine polyamine-épihalohydrine qui présente un faible niveau d'espèces produisant du CPD et une bonne stabilité à la solidification. Selon l'invention, une résine polyamine- épihalohydrine est préparée avec un rapport épihalohydrine:amine inférieur à environ 1.1:1Ø La résine est alors soumise à un traitement de base, puis à un traitement acide, et devient ainsi une résine dotée d'une bonne stabilité au stockage et à la solidification, produisant de faibles niveaux de CPD.

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