Continuous preparation of ultrathin polymeric membrane laminates

Details Continuous preparation of ultrathin polymeric membrane laminates Continuous preparation of ultrathin polymeric membrane laminates

1977-11-21

1979-05-22

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

264298, B29D 706, B29D 2704

Patent

active

041557930

ABSTRACT:
A composite laminar membrane including a flexible microporous support layer and at least one ultrathin permeable nonporous polymeric membrane of 500 angstroms or less in thickness is prepared by a continuous process. A liquid substrate having a well in its upper surface is provided and polymer-containing casting solution is continuously supplied to the well to effect continuous solution spreading across the liquid surface. Solvent is removed and a web of the support material is continuously contacted with the resulting ultrathin membrane to continuously remove it upwardly from a region of the liquid surface. In a preferred embodiment, an additional well spaced from the removal region is employed for producing an additional membrane, which is continuously removed from its liquid surface in contiguous contact with the liquid-contact surface of the first membrane.

REFERENCES:
patent: 3580841 (1971-05-01), Cadotte et al.
patent: 3767737 (1973-10-01), Lundstrom
patent: 3874986 (1975-04-01), Browall et al.
patent: 3933561 (1976-01-01), Larson et al.
patent: 3980456 (1976-09-01), Browall
"A New Material and Techniques for the Fabrication and Measurement of Very Thin Films for use in 4.pi.-Counting", Pate & Jaffe, Canad. J. Chem., vol. 33, pp. 15-23 (1955).

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