US4028172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making paper
Assignee: Ingredion Inc
•
Filing: 1975-10-23
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Granted: 1977-06-07
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Expires: 1995-10-23
Abstract
Abstract An improved process for making paper is described which improvement concerns the mitigation or avoidance of a commonly occurring problem in the industry termed "wet press picking" by means of specified polymeric siloxane additives.
Inventors
- 👤 Emil D. Mazzarella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:30
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/59
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
105 words
In a process of making paper the improvement which comprises the step of adding to the wet pulp, prior to its entrance into the press section of the paper machine, a polysiloxane polymer selected from the group consisting of (A) a fluid water-soluble copolymer of dimethylpolysiloxane-polyoxyalkylene ether wherein the alkylene moiety is ethylene, propylene or mixtures thereof, and (B) an aqueous emulsion of dimethylpolysiloxane, said emulsion remaining water dispersible in all proportions, in an amount sufficient to provide a concentration of from about 0.005 to 0.15% of active polymer based on dry fiber weight, thereby substantially or completely eliminating the problem of wet press picking.
Claim 2
Dependent Claim
105 words
In a process of making paper the improvement which comprises the step of adding to the wet pulp, prior to its entrance into the press section of the paper machine, a polysiloxane polymer selected from the group consisting of (A) a fluid water-soluble copolymer of dimethylpolysiloxane-polyoxyalkylene ether wherein the alkylene moiety is ethylene, propylene or mixtures thereof, and (B) an aqueous emulsion of dimethylpolysiloxane, said emulsion remaining water dispersible in all proportions, in an amount sufficient to provide a concentration of from about 0.005 to 0.15% of active polymer based on dry fiber weight, thereby substantially or completely eliminating the problem of wet press picking.
Claim 3
Dependent Claim
15 words
The process of claim 1, wherein said polysiloxane polymer is sprayed onto the wet pulp.
Claim 4
Dependent Claim
27 words
The process of claim 1, wherein said polysiloxane polymer is a fluid water-soluble copolymer of dimethylpolysiloxane-polyoxyalkylene ether wherein the alkylene moiety is ethylene, propylene or mixtures thereof.
Claim 5
Dependent Claim
15 words
The process of claim 1, wherein said polysiloxane polymer is an aqueous emulsion of dimethylpolysiloxane.
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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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |