US4018647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the impregnation of a wet fiber web with a heat sensitized foamed latex binder
Assignee: Chemische Industrie Aku Goodrich BV
•
Filing: 1974-06-10
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Granted: 1977-04-19
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Expires: 1994-06-10
Abstract
Abstract A fiber web made by the wet method on a paper making machine is impregnated with a heat sensitized, foamed latex binder as the web passes through a screening area of the paper making machine.
Inventors
- 👤 Popke Wietsma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:35
CPC Classifications
D; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H23/24; D21H23/26; D21H23/28; D21H21/00; D21H21/50; D21H21/56
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
In the process of manufacturing a fiber web made by the wet method on a paper machine impregnated with a latex binder composition while passing through a screening area of a paper making type machine, the improvement which comprises applying a foamed latex binder composition heat-sensitized to coagulate in the temperature range of from 35° to 95° C as a layer on the top surface of said web, drawing said layer of foamed composition into said web by means of suction, pg,8 and drying the resulting web and its content of foamed binder composition to coagulate said foamed binder composition.
Claim 2
Dependent Claim
100 words
In the process of manufacturing a fiber web made by the wet method on a paper machine impregnated with a latex binder composition while passing through a screening area of a paper making type machine, the improvement which comprises applying a foamed latex binder composition heat-sensitized to coagulate in the temperature range of from 35° to 95° C as a layer on the top surface of said web, drawing said layer of foamed composition into said web by means of suction, pg,8 and drying the resulting web and its content of foamed binder composition to coagulate said foamed binder composition.
Claim 3
Dependent Claim
48 words
The process as claimed in claim 1 wherein said non-woven web has a dry, non-impregnated weight between about 10 and about 400 grams per square meter and the resulting dry impregnated web contains between about 10% and 50% by weight of binder calculated on said dry web weight.
Claim 4
Dependent Claim
61 words
The process as claimed in claim 1 wherein said latex binder composition contains a self-reactive poly (ethyl acrylate) latex and from about 0.05% to about 3% by weight, calculated as dry matter on the dry weight of latex, of a siloxane oxyalkylene block copolymer as a heat sensitizer, and coagulates at a temperature in the range of 35° - 65° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |