Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ion-exchange polymer or process of preparing
Patent
1994-12-14
1996-04-23
Zitomer, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Ion-exchange polymer or process of preparing
21050027, 21050035, 21050042, 21050043, 521 30, 521 38, C08J 522
Patent
active
055103944
ABSTRACT:
It has been discovered (Examples 4, 11 and 17) that certain desirable films will not absorb a sufficient amount of certain desirable, polymerizable monomers as to result in interpolymer membranes having desirable ion exchange properties after polymerization of any absorbed such monomers and after any subsequent conversion of such absorbed and polymerized monomers into ionizable moieties. It has also been discovered that if a predetermined amount of plasticizer, extractable by such monomers, is incorporated into such films, then the latter will absorb a sufficient amount of such monomers as to result (after polymerization of such monomers) in interpolymer membranes having desirable ion exchange properties. Examples of preferred monomers include the polar (meth) acryloxy and (meth) acrylamido monomers 2-(methacryloxy) ethane sulfonic acid, 2-(acrylamido)-2-methyl propane sulfonic acid, N-(2-methacryloxy ethyl)-N,N-dimethyl amine, N-(3-methacrylamido-propyl)-N,N-dialkyl-N-methyl ammonium halides and N-(2-methacryloxy ethyl)-N,N,N-trimethyl ammonium chloride. Such monomers may be mixed with a minor amount of crosslinking monomer such as divinyl benzene, ethylene glycol dimethacrylate and trimethylol propane trimethacrylate. Preferably any amine moieties in the resulting interpolymer membranes are converted to quaternary ammonium groups.
REFERENCES:
patent: 3647086 (1972-03-01), Mizutani
patent: 5118717 (1992-06-01), Hodgdon
patent: 5264125 (1993-11-01), MacDonald
Ionics Incorporated
Saliba Norman E.
Zitomer Fred
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