Composite microporous membranes
AssigneeHoechst Celanese Corporation
InventorsKaren A. Donato, Lessie C. Phillips
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Abstract
The composite membrane is disclosed having a microporous support which is coated with a polymer composition and a contact adhesive layer applied to said polymer. A process for making and a process for using the membrane is also disclosed.
Claims24
An adhesive and polymer coated microporous membrane comprising a microporous support characterized by having a crystallinity of at least 40%, an average pore width of from about 0.005 to about 0.6 microns, a void volume from about 30% to about 50%;
- said microporous polymeric film coated on at least one side with a polymer coating, and a contact adhesive layer;
- said coating being designed to substantially preclude filling of the pores of said membrane by said adhesive.
A composite membrane having reduced pore filling comprising a microporous support, a polymer coating coated thereon, and a contact adhesive layer adjacent said coating on at least one side that is permeable to a drug;
- said coating being designed to substantially preclude filling of the pores of said membrane by said adhesive.
An improved membrane delay process comprising the steps of (i) feeding a fluid to be delayed into a membrane containing apparatus and (ii) delaying the passage of the fluid across the membrane, the improvement comprising the use of a composite membrane having reduced pore filling, said membrane comprising a microporous support, a polymer coating and a contact adhesive layer adjacent said coating on at least one side that is permeable to said fluid;
- said coating being designed to substantially preclude filling of the pores of said membrane by said adhesive.
A process for making a composite membrane having reduced pore filling and suitable for use in fluid delay process comprising (i) coating a microporous support with coating polymer and (ii) coating said polymer with a contact adhesive layer;
- said coating being designed to substantially preclude filling of the pores of said membrane by said adhesive.
Dependencies are inferred from the claim text.