US4010067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preventing formation of resinous deposits in the manufacture of paper and the like
Assignee: BK Giulini Chemie GmbH
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Filing: 1975-02-21
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Granted: 1977-03-01
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Expires: 1995-02-21
Abstract
Abstract The difficulties encountered in the manufacture of paper, cardboard, and other cellulosic articles, as they are caused by the formation of resinous or pitch deposits on the paper as well as on the paper machines and processing apparatus, are overcome or at least considerably reduced, by the addition of phosphonic acids and more particularly of alkyl, amino or hydroxy alkyl, or cycloalkyl phosphonic acids or their alkali metal salts and of orthophosphoric acid or its alkali metal salts and/or of polyphosphoric acids. If required, amino polycarboxylic acids, hydroxy carboxylic acids, or their alkali metal salts, or alkali metal polyphosphates are also added during processing.
Inventors
- 👤 Ernst Hoeger
- 👤 Margarete Scholl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:13
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/08; D21C9/086; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07; D21H17/10; D21H21/00; D21H21/02; Y; Y10; Y10S; Y10S162/00; Y10S162/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
107 words
In a process of preventing formation of resinous deposits and overcoming pitch trouble from a resin-containing cellulosic starting material in the manufacture of paper, cardboard, boxboard, and the like, said process comprising adding to the resin-containing cellulosic starting material during processing an additive consisting essentially of a phosphonic acid or an alkali metal salt thereof and orthophosphoric acid or an alkali metal salt thereof, said additive being added in an amount between about 0.02% and about 1.0%, calculated for dry cellulosic material in said starting material, and said phosphonic acid component and said orthophosphoric acid component being present in a ratio of from about 1:10 to 10:1.
Claim 2
Dependent Claim
107 words
In a process of preventing formation of resinous deposits and overcoming pitch trouble from a resin-containing cellulosic starting material in the manufacture of paper, cardboard, boxboard, and the like, said process comprising adding to the resin-containing cellulosic starting material during processing an additive consisting essentially of a phosphonic acid or an alkali metal salt thereof and orthophosphoric acid or an alkali metal salt thereof, said additive being added in an amount between about 0.02% and about 1.0%, calculated for dry cellulosic material in said starting material, and said phosphonic acid component and said orthophosphoric acid component being present in a ratio of from about 1:10 to 10:1.
Claim 3
Dependent Claim
170 words
The process of claim 1, in which the phosphonic acid added is a phosphonic acid of the formula ##STR5## in which R 1 is hydrogen, lower alkyl such as --CH 3 or --(CH 2 ) n .CH 3 , the amino group --NH 2 , hydroxy methyl --CH 2 OH, a lower alkanoic acid group --(CH 2 ) n .COOH, a lower alkyl phosphonic acid group --(CH 2 ) n --PO 3 H 2 , or a group of the formula ##STR6## R 2 is hydrogen, hydroxyl --OH, the phosphonic acid group --PO 3 H 2 , a lower alkanoic acid group --(CH 2 ) n .COOH, or a group of the formulas ##STR7## R 3 is hydrogen, hydroxyl --OH, the amino group --NH 2 , lower alkyl such as --CH 3 or --(CH 2 )--CH 3 , a lower alkanoic acid group --(CH 2 ) n --COOH, or the groups of the formulas --NH--(CH.sub.2).sub.n --PO.sub.3 H.sub.2, --nh--ch.sub.2 --cooh, or ##STR8## n is one of the numerals 0 to 6.
Claim 4
Dependent Claim
29 words
The process of claim 1, wherein said additive further contains a compound selected from the group consisting of amino polycarboxylic acids, hydroxy carboxylic acids, and their alkali metal salts.
Claim 5
Dependent Claim
19 words
The process according to claim 1, in which the amount of additive is between about 0.04% and about 0.3%.
Claim 6
Dependent Claim
18 words
The process of claim 2, in which the amount of additive is between about 0.04% and about 0.3%.
Claim 7
Dependent Claim
29 words
The process of claim 1, in which the addition agent preventing formation of resinous deposits during processing is a mixture of diethylene tri-amino penta-methylene phosphonic acid and orthophosphoric acid.
Claim 8
Dependent Claim
28 words
The process of claim 1, in which the agent preventing formation of resinous deposits during processing is a mixture of ethylene diamino tetra-methylene phosphonic acid and orthophosphoric acid.
Claim 9
Dependent Claim
19 words
The process of claim 1, in which the alkali metal salts of the phosphonic acids are added during processing.
Claim 10
Dependent Claim
14 words
The process of claim 1, wherein said ratio is between about 1:4 and 4:1.
Claim 11
Dependent Claim
11 words
The process of claim 1, wherein said ratio is about 1:4.
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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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |