US4755561A
Expired / Lapsed
US
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Poly(disubstituted acetylene)/polyorganosiloxane graft copolymer and membrane for gas separation
Assignee: Sagami Chemical Research Institute
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Filing: 1987-11-12
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Granted: 1988-07-05
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Expires: 2007-11-12
Abstract
Abstract A membrane for selectively separating gases having high and selective permeability for oxygen and sufficient strength which is capable of extracting and concentrating oxygen in a mixed gases, especially in the air, and is produced from a novel poly(disubstituted acetylene)/polyorganosiloxane graft copolymer where the main chain is composed of poly(disubstituted acetylene) and the side chain is composed of polyorganosiloxane, and the copolymer.
Inventors
- 👤 Kiyohide Matsui
- 👤 Yu Nagase
- 👤 Masaki Uchikura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:41
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/76; B01D71/78; B01D71/70; B01D71/701; C; C08; C08F; C08F8/00; C08F8/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
Poly(disubstituted acetylene)/polyorganosiloxane graft copolymer, comprising the repeating unit of said copolymer being expressed by the following general formula: ##STR24## (where R 1 -R 3 are the same or different groups selected from alkyl, substituted alkyl, phenyl, and substituted phenyl groups and X is a hydrogen atom or a group expressed by the following general formula: ##STR25## and R 1 -R 3 and X may be arbitrarily different for different repeating units. Y is an oxygen atom or a divalent organic group. Z is a polyorganosiloxane chain and R 4 -R 8 are an alkyl, a substituted alkyl, a phenyl or a substituted phenyl group and they may be the same or different to each other), the ratio in moles of the repeating units on the main chain, poly(substituted acetylene), to the repeating units on the side chain, polyorganosiloxane, being in the range from 90/10 to 10/90 and the molecular weight being not less than 10,000.
Claim 2
Dependent Claim
155 words
Poly(disubstituted acetylene)/polyorganosiloxane graft copolymer, comprising the repeating unit of said copolymer being expressed by the following general formula: ##STR24## (where R 1 -R 3 are the same or different groups selected from alkyl, substituted alkyl, phenyl, and substituted phenyl groups and X is a hydrogen atom or a group expressed by the following general formula: ##STR25## and R 1 -R 3 and X may be arbitrarily different for different repeating units. Y is an oxygen atom or a divalent organic group. Z is a polyorganosiloxane chain and R 4 -R 8 are an alkyl, a substituted alkyl, a phenyl or a substituted phenyl group and they may be the same or different to each other), the ratio in moles of the repeating units on the main chain, poly(substituted acetylene), to the repeating units on the side chain, polyorganosiloxane, being in the range from 90/10 to 10/90 and the molecular weight being not less than 10,000.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |