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...

2006-07-25

2006-07-25

Boykin, Terressa M. (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

C162S164300, C524S017000, C524S422000, C524S608000, C524S812000, C524S846000, C528S328000, C528S486000, C528S487000

Reexamination Certificate

active

07081512

ABSTRACT:
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.

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