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2 065 321

(13)

C1

(51)

IPC

(21) (22)

Application

93019142/04, 1993-04-12

(22)

Actual filing date

1993-04-12

(45)

Published

1996-08-20

(72)

Inventor

Semenova S.I.Vdovin P.A.Platonov K.N.Jakuseva N.N.Karachevtsev V.G.

(73)

Holder

Aktsionernoe Obshchestvo

METHOD OF DIAPHRAGM MAKING Russian patent published in 1996 - IPC

Abstract RU 2065321 C1

FIELD: chemical industry. SUBSTANCE: on ultrafiltering backing made of polymer which is insoluble in used organic solvent 1-2 layers of 0.5-6.0% solution of interaction product of bi- or trifunctional polyether were applied successively by immersion method. Polyether is based on ethylene oxide and propylene oxide at ratio 70:30 and diisocyanate at molecular mass 2500-10000. Then 1-4 layers of indicated solution were applied with 0.5-6.0% water-soluble polymer solution by order of increase of the latter content in mixture and then 1-3 layers of 0.5-6.0% water-soluble polymer solution were applied at intermediate exposition at 70-80 C for 1-3 min. before each layer applying. Method is used for organic solvent dehydration. EFFECT: improved method of making. 1 tbl

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RU 2 065 321 C1

Authors

Semenova S.I.

Vdovin P.A.

Platonov K.N.

Jakuseva N.N.

Karachevtsev V.G.

Dates

1996-08-20—Published

1993-04-12—Filed

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