Process for preparing membranes
AssigneeFujifilm Manufacturing Europe B.V.
InventorYujiro Itami
Life of this patent
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Abstract
A process for preparing a composite membrane comprising a porous support layer and a discriminating layer, comprising the steps of: (a) providing a porous support layer; (b) incorporating an inert liquid into the pores of the support layer; (c) applying a curable composition to the support layer; and (d) curing the composition, thereby forming the discriminating layer on the porous support. The process is particularly useful for preparing gas separation composite membranes.
Claims16
A process for preparing a composite membrane comprising a porous support layer and a discriminating layer, comprising the steps of:
- (a) providing a porous support layer;
- (b) incorporating an inert liquid into the pores of the support layer;
- (c) applying a curable composition to the support layer;
- and
- (d) curing the composition b irradiating the composition for less than 30 seconds, thereby forming the discriminating layer on the porous support;
- wherein the curable composition is a radiation curable composition and wherein the curable composition is applied continuously to the porous layer by means of a manufacturing unit comprising a curable composition application station, an irradiation source, a composite membrane collecting station, and a means for moving a porous support layer from the curable composition application station to the irradiation source and to the composite membrane collecting station.
A composite membrane obtained by a process comprising the steps of:
- (a) providing a porous support layer;
- (b) incorporating an inert liquid into the pores of the support layer;
- (c) applying a curable composition to the support layer;
- and
- (d) curing the composition, thereby forming the discriminating layer on the porous support;
- wherein the curable composition is a radiation curable composition comprising:
- (i) 0 to 20 parts in total of monofunctional compounds;
- (ii) 1 to 20 parts in total of difunctional compounds;
- (iii) 0 to 5 parts in total of polyfunctional compounds;
- (iv) 75 to 99 parts of an inert liquid;
- and
- (v) 0.01 to 5 parts of photoinitiator;
- wherein all parts are by weight.
Dependencies are inferred from the claim text.