Method for sealing cation exchange membranes of carboxylic acid

Details Method for sealing cation exchange membranes of carboxylic acid Method for sealing cation exchange membranes of carboxylic acid

1979-09-28

1981-09-22

Wityshyn, Michael G.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 731, 429 4, 429139, 429249, B29C 2708, B32B 3120

Patent

active

042908337

ABSTRACT:
A method is provided for sealing portions of cation exchange membranes of carboxylic acid type fluorinated polymers. The portions of the membranes to be sealed are in the ester form of the membrane and are ultrasonically sealed at sealing times of from about 0.1 to about 5 seconds while employing power in the range of from about 50 to about 600 watts.
The novel method of the present invention can be used to repair membranes of carboxylic acid type fluorinated polymers which have been torn, slit, or cut. Sections of membrane materials may be sealed together to form an enlarged or reinforced membrane. The sealed portions are substantially free of wrinkles and are not mechanically damaged or weakened.

REFERENCES:
patent: 3134703 (1964-05-01), Listner
patent: 3508989 (1970-04-01), Lawrence et al.
patent: 3772089 (1973-11-01), Bennett et al.
patent: 4026000 (1977-05-01), Anderson
patent: 4037030 (1977-07-01), Sabatino
patent: 4115240 (1978-09-01), Asawa

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