초록 ▼

A composite semipermeable membrane is provided comprised of: (a) a flexible film of microporous hydrophobic material having a polar molecule vapor transmission rate in excess of 10,000 gms/m2ㆍ24 hours, preferably 100,000 gms/m2ㆍ24 hours, and an advancing polar liquid contact angle exceeding 90 degre

A composite semipermeable membrane is provided comprised of: (a) a flexible film of microporous hydrophobic material having a polar molecule vapor transmission rate in excess of 10,000 gms/m2ㆍ24 hours, preferably 100,000 gms/m2ㆍ24 hours, and an advancing polar liquid contact angle exceeding 90 degrees, and (b) a continuous, crosslinked amorphous hydrophilic layer penetrated to an extent into the face of the hydrophobic layer. The hydrophilic layer, when appropriately located in the structure of the microporous hydrophobic material provides a composite membrane having a polar vapor transmission rate of the complete ensemble comparable to or even exceeding that of the hydrophobic material alone, and simultaneously offering two mechanisms of separation; that imposed by the microporous layer and that imposed by the continuous, dense amporphous polymer layer, and as such is capable of numerous separation operations.

대표청구항 ▼

A flexible, layered composite semipermeable membrane comprising: (a) a flexible film of a microporous material having a polar molecular vapour transmission rate in excess of 10,000 gms/m2ㆍ24 hours, and an advancing polar liquid contact angle exceeding 90 degrees, and (b) a continuous, hydrophilic la

A flexible, layered composite semipermeable membrane comprising: (a) a flexible film of a microporous material having a polar molecular vapour transmission rate in excess of 10,000 gms/m2ㆍ24 hours, and an advancing polar liquid contact angle exceeding 90 degrees, and (b) a continuous, hydrophilic layer penetrated to an extent into the face of said hydrophobic layer and physically attached thereto, said composite membrane having a transmission rate of a polar vapour exceeding 80 percent that of said material alone, wherein said hydrophobic layer is an essentially odorless solid polyether polythioether comprised of the free radical chain extended reaction product of: (a) a terminally unsaturated polyene comprising the formula: R－[(CH2)mCH〓CH2]x, wherein m=O or 1 and x≥2; (b) a polythiol component comprising the formula: [Figure] wherein N=O or 1, R′=H or OH and y≥2; (c) a free radical initiator; and (d) a suitable energy source, wherein at least one R is polyoxyethylene and the other R may be polyoxyethylene or a polyvalent organic moiety free from hydrolytically sensitive functional groups and other carbon-to-carbon unsaturation or thiol functional groups.