Process for removing metals from vinylphenol-type polymers

Details Process for removing metals from vinylphenol-type polymers Process for removing metals from vinylphenol-type polymers

1998-01-30

1999-07-27

Truong, Duc

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

Synthetic resins

Treating polymer containing material or treating a solid...

528492, 528493, 528495, 528502A, 528503, 210348, 21050027, 21050037, 21050038, C08F 608

Patent

active

059292040

ABSTRACT:
Vinylphenol-type polymers are useful materials and are used in many fields such as photoresist, packaging material for IC, printed circuit board, lense, etc. When the polymers are used in an electronic field such as photoresist and packaging material for IC, it is desired to reduce metal concentration in the polymer in the order of ppb units. A simple and effective process for removing metals from vinylphenol-type polymers is disclosed. The process comprises passing an organic solvent solution of a vinylphenol-type polymer either through (a) a filter containing an ion exchange material and/or a chelate-forming material and generating a zeta (.zeta.) potential by a cationic charge modifying agent or through (b) (i) a filter containing an ion exchange material and/or a chelate-forming material and (ii) a filter generating a zeta (.zeta.) potential by a cationic charge modifying agent.

REFERENCES:
patent: 2802820 (1957-08-01), Zech
patent: 4007113 (1977-02-01), Ostreicher
patent: 5284930 (1994-02-01), Matsumoto et al.
patent: 5288850 (1994-02-01), Matsumoto et al.
Fiber and Polymer Material Research Institute Report, vol. 128, p. 65 (1981).

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