US4178271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet-like structure of polyvinyl chloride, which is capable of absorbing water vapor and transmitting water vapor
Assignee: Hoechst AG
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Filing: 1977-12-22
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Granted: 1979-12-11
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Expires: 1997-12-22
Abstract
Abstract This invention relates to a sheet-like structure of polyvinyl chloride or a copolymer of vinyl chloride, which is capable of absorbing water vapor and transmitting water vapor, with a uniformly incorporated additive composed of polymeric particles of at least one swellable, modified polymer. The invention also relates to a process for manufacturing the sheet-like structure.
Inventors
- 👤 Walter Busch
- 👤 Arno Holst
- 👤 Wilhelm Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:58
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L1/00; C08L33/00; C08L33/02; C08L33/24; C08L33/26; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
In a sheet-like structure of polyvinyl chloride or a copolymer of vinyl chloride, which is capable of absorbing water vapor and transmitting water vapor, with a uniformly incorporated additive, the improvement comprising that said additive is composed of polymeric particles of at least one modified starch ether or cellulose ether, which has been modified by cross-linking, effected by means of heat energy, radiation or an additional chemical compound, which is insoluble in water to the extent of at least 50% by weight, and which is swellable in aqueous liquids.
Claim 2
Dependent Claim
89 words
In a sheet-like structure of polyvinyl chloride or a copolymer of vinyl chloride, which is capable of absorbing water vapor and transmitting water vapor, with a uniformly incorporated additive, the improvement comprising that said additive is composed of polymeric particles of at least one modified starch ether or cellulose ether, which has been modified by cross-linking, effected by means of heat energy, radiation or an additional chemical compound, which is insoluble in water to the extent of at least 50% by weight, and which is swellable in aqueous liquids.
Claim 3
Dependent Claim
39 words
A sheet-like structure as claimed in claim 1, wherein said additional chemical compound is selected from the group consisting of phosphorus oxychloride, dichloroacetic acid and a compound which carries the following group which is reactive towards hydroxyl groups: ##STR7##
Claim 4
Dependent Claim
18 words
A sheet-like structure as claimed in claim 1 which comprises about 10 to 30% by weight of additive.
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) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |