Trace metal ion reduction by Ion Exchange Pack

Details Trace metal ion reduction by Ion Exchange Pack Trace metal ion reduction by Ion Exchange Pack

1998-07-01

1999-09-21

Truong, Duc

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

Synthetic resins

Treating polymer containing material or treating a solid...

528491, 528499, 528502R, 528503, 521 25, 521 28, 430914, 210681, 210686, 210688, C08F 600

Patent

active

059555700

ABSTRACT:
The present invention provides methods for solutions having a very low level of metal ions, utilizing a specially designed Ion Exchange Pack. A method is also provided for producing photoresist composition having a very low level of metal ions from novolak resins purified in a process using such an Ion Exchange Pack.

REFERENCES:
patent: 5073622 (1991-12-01), Wojtech et al.
patent: 5525315 (1996-06-01), Burke
patent: 5679766 (1997-10-01), Zampini
patent: 5702611 (1997-12-01), Gronbeck et al.

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