Plastic and nonmetallic article shaping or treating: processes – Reactive gas or vapor treatment of work – Work is organic material
Patent
1985-12-12
1988-08-09
Van Balen, William J.
Plastic and nonmetallic article shaping or treating: processes
Reactive gas or vapor treatment of work
Work is organic material
264154, 264232, 264235, 2642888, 264DIG47, B28B 1100, B29C 6720, B29C 7100
Patent
active
047626577
ABSTRACT:
This invention relates to a method for producing large area, controlled, uniform deformation of polymeric films which retards premature fracturing. The method includes a deformation step. Sulfonating and annealing the sulfonated deformed film are optional treatments of the method. Deformation can be achieved using pressing, peeling or rolling techniques. The deformed film is sulfonated utilizing sulfuric acid or fuming sulfuric acid.
The product obtained using the inventive method results in a deformed film which has improved flow and entrance pressure characteristics compared to non-deformed film materials. The product can be used as a microfiltration membrane, ultrafiltration membrane or filter for various gas, vapor or liquid mixtures. The film may also serve as a porous substrate or other media for other types of fluid separation or purification.
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Rogers Charles E.
Shen Zhong-He
The Dow Chemical Company
Van Balen William J.
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