US4210488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the dry strength of paper and for improving the effect of optical brighteners in the preparation or coating of paper
Assignee: Individual
•
Filing: 1979-02-23
•
Granted: 1980-07-01
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Expires: 1999-02-23
Abstract
Abstract A process for improving the dry strength of paper and for improving the effect of optical brighteners in the preparation or coating of paper which includes the step of adding fillers and/or pigments and anionic brighteners to the paper making process the improvement comprising adding to paper making pulp a polypiperidine halide absorbed in a dispersed state on a fine-particle organic or inorganic carrier before the anionic brightener is added.
Inventors
- 👤 Peter J. Reuss
- 👤 Josef Weigl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:12
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/30; D06; D06L; D06L4/00; D06L4/60; D06L4/664; D21H21/18
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
74 words
In a process for improving the dry strength of paper and for improving the effect of optical brighteners in the preparation of paper which includes the step of adding fillers and/or pigments and anionic brighteners to the paper making process the improvement comprising adding to paper making pulp a polypiperidine halide adsorbed in a dispersed state on a fine-particle organic or inorganic carrier and thereafter adding the anionic brightener to said paper making pulp.
Claim 2
Dependent Claim
74 words
In a process for improving the dry strength of paper and for improving the effect of optical brighteners in the preparation of paper which includes the step of adding fillers and/or pigments and anionic brighteners to the paper making process the improvement comprising adding to paper making pulp a polypiperidine halide adsorbed in a dispersed state on a fine-particle organic or inorganic carrier and thereafter adding the anionic brightener to said paper making pulp.
Claim 3
Dependent Claim
13 words
The process according to claim 1, wherein the polypiperidine halide is polypiperidine chloride.
Claim 4
Dependent Claim
15 words
The process according to claim 1, wherein the polypiperidine halide is polydimethyl diallyl ammonium chloride.
Claim 5
Dependent Claim
33 words
The process according to claim 1, wherein said carrier consists of fine-particle inorganic substances selected from the group consisting of kaolin, talcum, calcium carbonate, magnesium silicate, aluminum silicate, calcium silicate and silica gel.
Claim 6
Dependent Claim
23 words
The process according to claim 4, wherein from 0.05 to 1% by weight of polypiperidine halide based on the inorganic substance is employed.
Claim 7
Dependent Claim
23 words
The process according to claim 4, wherein from 0.1 to 0.4% by weight of polypiperidine halide based on the inorganic substance is employed.
Claim 8
Dependent Claim
32 words
The process according to claim 4, wherein from 0.1 to 1.5% by weight of starch and from 0.05 to 1% by weight of polypiperidine halide based on the inorganic substance are employed.
Claim 9
Dependent Claim
32 words
The process according to claim 4, wherein from 0.5 to 1% by weight of starch and from 0.05 to 1% by weight of polypiperidine halide based on the inorganic substance are employed.
Claim 10
Dependent Claim
37 words
The process according to claim 1, wherein said carrier consists of fine-particle organic substances selected from the group consisting of starch, carboxy methyl cellulose, fine-particle cellulose fiber of various degrees of pulping and fine-particle mechanical wood pulp.
Claim 11
Dependent Claim
24 words
The process according to claim 1, wherein said carrier is organic and including slurrying said organic carrier and the polypiperidine halide in aqueous solution.
Claim 12
Dependent Claim
17 words
The process according to claim 1, wherein said anionic brighteners are derivatives of diamino stilbene disulphonic acid.
Claim 13
Dependent Claim
20 words
The process according to claim 1, including heating said polypiperidine halide with starch prior to contact with said inorganic carrier.
Claim 14
Dependent Claim
38 words
The process according to claim 12, including heating the starch and the polypiperidine halide in aqueous medium to temperatures of between 40° and 70° C., cooling said starch and halide containing medium, adding said carrier to said medium.
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) | 1983-07-01 | 1983-12-31 | 1984-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-01 | 1987-12-31 | 1988-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-01 | 1991-12-31 | 1992-07-01 | $7700.00 | Window Closed / Lapsed |