EP0133699A2
Expired / Lapsed
EP
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Compositions for imparting temporary wet strength to paper
Assignee: Wyeth Holdings LLC
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Filing: 1984-08-07
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Granted: —
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Expires: 2004-08-07
Abstract
Abstract A composition for imparting temporary wet strength to paper comprising a solution containing from about one percent to about ten percent by weight of a vinylamide polymer having sufficient glyoxal-reactive amide substituents and -CHOHCHO substituents to be thermosetting, in a solvent selected from the group consisting of water, water-miscible solvents containing free hydroxyl functionality, and mixtures thereof, to which solution has been added a sufficient quantity of a strong base for reaction therewith to adjust the pH of the aqueous solution to a value of from about 8.5 to about 11. Also disclosed is a process for imparting temporary wet strength to paper by application thereto of a wet strengtheningly effective amount of such aqueous composition, and the paper product of such process.
Inventors
- 👤 Gerald Joseph Guerro
- 👤 Robert Joseph Proverb
- 👤 Robert Floyd Tarvin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 01:46
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/18; D21H21/20; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/38; D21H17/39; D21H17/63; D21H17/64; D21H17/65
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
118 words
A composition for imparting temporary wet strength to paper, comprising a solution containing from about one percent to about ten percent by weight, based on the weight of said solution, of awater-soluble vinylamide polymer having sufficient glyoxal-reactive amide substituents and -CHOHCHO substituents to be thermosetting, in a solvent selected from the group consisting of water, water-miscible solvents containing free hydroxyl functionality, and mixtures thereof, the ratio of the number of said -CHOHCHO substituents to the number of said glyoxal-reactive amide substituents being in excess of 0.06:1, to which has been added a sufficient quantity of a strong base for reaction therewith to adjust the pH of the solution to a value of from about 8.5 to about 11.
Claim 2
Dependent Claim
118 words
A composition for imparting temporary wet strength to paper, comprising a solution containing from about one percent to about ten percent by weight, based on the weight of said solution, of awater-soluble vinylamide polymer having sufficient glyoxal-reactive amide substituents and -CHOHCHO substituents to be thermosetting, in a solvent selected from the group consisting of water, water-miscible solvents containing free hydroxyl functionality, and mixtures thereof, the ratio of the number of said -CHOHCHO substituents to the number of said glyoxal-reactive amide substituents being in excess of 0.06:1, to which has been added a sufficient quantity of a strong base for reaction therewith to adjust the pH of the solution to a value of from about 8.5 to about 11.
Claim 3
Dependent Claim
48 words
A composition according to Claim 1, wherein the solution has been stabilized for enhancement of shelf life of said composition, by addition thereto of a sufficient quantity of a mineral acid to adjust the pH of said solution to a value of from about 3 to about 4.
Claim 4
Dependent Claim
17 words
A composition according to Claim 1, wherein said polymer is in colloidal state in said aqueous solution.
Claim 5
Dependent Claim
27 words
A composition according to Claim 1, wherein said solvent containing free hydroxyl functionality is selected from the group consisting of methanol, ethanol, ethylene glycol and propylene glycol.
Claim 6
Dependent Claim
13 words
A composition according to Claim 1, wherein said polymer is a cationic polymer.
Claim 7
Dependent Claim
23 words
A composition according to Claim 1, wherein said polymer is a cationic water-soluble about 99:1 to 75:25 molar ratio acrylamide:diallyldimethyl ammonium chloride polymer.
Claim 8
Dependent Claim
30 words
A composition according to Claim 1, wherein said pH is adjusted by addition of a strong base to a value in the range of from about 9.0 to about 10.6.
Claim 9
Dependent Claim
36 words
A composition according to Claim 2, wherein said aqueous solution is stabilized by addition of sufficient quantity of said mineral acid to adjust the pH thereof to a value of from about 3.2 to about 3.8.
Claim 10
Dependent Claim
22 words
A composition according to Claim 1 wherein said strong base is selected from the group consisting of potassium hydroxide and sodium hydroxide.
Claim 11
Dependent Claim
13 words
A composition according to Claim 1, wherein said strong base is sodium hydroxide.
Claim 12
Dependent Claim
24 words
A composition according to Claim 2, wherein said mineral acid is selected from the group consisting of hydrochloric acid, sulfuric acid and nitric acid.
Claim 13
Dependent Claim
13 words
A composition according to Claim 2 wherein said mineral acid is hydrochloric acid.
Claim 14
Dependent Claim
26 words
I3. A process for imparting temporary wet strength to paper, comprising applying thereto a wet strengtheningly effective amount of the aqueous composition according to Claim 1.
Claim 15
Dependent Claim
18 words
A process according to Claim 13, wherein said aqueous composition is applied to said paper by spray application.
Claim 16
Dependent Claim
37 words
A process for imparting temporary wet strength to paper manufactured from an aqueous suspension of cellulose paper-making fibers, comprising adding to said aqueous suspension a wet strengtheningly effective amount of the aqueous composition according to Claim 1.
Claim 17
Dependent Claim
20 words
Paper with temporary wet strength, having applied thereto a wet strengtheningly effective amount of the aqueous composition of Claim 1.
References Cited (Backward Citations)
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