US4147682A
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Additive composition for use in papermaking
Assignee: Osakagodo Co Ltd
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Filing: 1977-12-07
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Granted: 1979-04-03
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Expires: 1997-12-07
Abstract
Abstract An additive composition for use in papermaking comprises a water-soluble polymer having in its molecule --COOH groups and/or --SO 3 H groups, polyaluminum chloride and an aqueous solvent. Because of formation of a kind of crosslinking structure between the water-soluble polymer molecules through the polyaluminum chloride, the above composition exerts an effect of enhancing the paper strength when used alone and an effect of enhancing both the sizing effect and the paper strength when used together with a sizing agent. The composition further increases the paper strength when used in combination with a conventional paper-strength improver.
Inventors
- 👤 Akira Yada
- 👤 Isamu Iijima
- 👤 Jo Itakura
- 👤 Saburo Fujikura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:44
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/66; C; C08; C08K; C08K3/00; C08K3/16; D21H17/20; D21H17/33; D21H17/34; D21H17/37; D21H17/375; D21H17/41; D21H17/42; D21H17/43; D21H17/44; D21H17/45; D21H17/455; D21H17/46; D21H17/53
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
109 words
An additive composition for use in paper-making, which comprises (1) a water-soluble polymer containing as a structural unit a vinyl monomer having --COOH group or a vinyl monomer having --SO 3 H group or both of them in a proportion of 0.05 to 10 mole percent (in terms of monocarboxylic sulfonic acid) based on the water soluble polymer, (2) polyaluminum chloride of the formula [Al.sub.2 (OH).sub.n Cl.sub.6-n ].sub.m where 1 ≦ n ≦ 5 and m ≦ 10, the amount of polyaluminum chloride in terms of aluminum atom being at least equivalent to the --COOH group and/or --SO 3 H group in the water-soluble polymer, and an aqueous solvent.
Claim 2
Dependent Claim
109 words
An additive composition for use in paper-making, which comprises (1) a water-soluble polymer containing as a structural unit a vinyl monomer having --COOH group or a vinyl monomer having --SO 3 H group or both of them in a proportion of 0.05 to 10 mole percent (in terms of monocarboxylic sulfonic acid) based on the water soluble polymer, (2) polyaluminum chloride of the formula [Al.sub.2 (OH).sub.n Cl.sub.6-n ].sub.m where 1 ≦ n ≦ 5 and m ≦ 10, the amount of polyaluminum chloride in terms of aluminum atom being at least equivalent to the --COOH group and/or --SO 3 H group in the water-soluble polymer, and an aqueous solvent.
Claim 3
Dependent Claim
25 words
A composition according to claim 1, wherein the amount of water-soluble polymer is 5 to 20% by weight based on the weight of the composition.
Claim 4
Dependent Claim
32 words
A composition according to claim 1, wherein the water-soluble polymer contains as a structural unit 0.05 to 2 mole percent of a vinyl monomer having --COOH group in terms of mono-carboxylic acid.
Claim 5
Dependent Claim
33 words
A composition according to claim 1, wherein the water-soluble polymer contains as a structural unit 0.05 to 5 mole percent of a vinyl monomer having --SO 3 H group as a mono-sulfonic acid.
Claim 6
Dependent Claim
59 words
A composition according to claim 1, wherein the vinyl monomer having --COOH group is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, and citraconic acid, and the vinyl monomer havin --SO 3 H group is selected from the group consisting of vinyl sulfonic acid, 2-sulfoethyl acrylate, and 2-acrylamido-2-methylpropanesulfonic acid.
Claim 7
Dependent Claim
39 words
A composition according to claim 3, wherein the vinyl monomer having --COOH group is at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid and citraconic acid.
Claim 8
Dependent Claim
34 words
A composition according to claim 4, wherein the vinyl monomer having --SO 3 H group is at least one monomer selected from the group consisting of vinyl sulfonic acid, 2-sulfoethyl acrylate, and 2-acrylamido-2-methylpropanesulfonic acid.
Claim 9
Dependent Claim
35 words
A composition according to claim 1, wherein the water-soluble polymer contains as main structural unit 90 to 99.5 mole percent of a polymerizable nonionic unsaturated monomer or a polymerizable cationic unsaturated monomer or both monomers.
Claim 10
Dependent Claim
63 words
A composition according to claim 8, wherein the polymerizable nonionic unsaturated monomer is at least one member selected from the group consisting of acrylamide, methacrylamide, dimethylacrylamide, and diacetoneacrylamide and the polymerizable cationic unsaturated monomer is at least one member selected from the group consisting of inorganic acid salts and quaternary ammonium salts of dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, and vinylpyridine.
Claim 11
Dependent Claim
50 words
A composition according to claim 5, wherein the water-soluble polymer contains as the main structural unit at least one monomer selected from the group consisting of acrylamide, methacrylamide, dimethyl acrylamide, diacetoneacrylamide, and inorganic acid salts and quaternary ammonium salts of dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate and vinylpyridine.
Claim 12
Dependent Claim
33 words
A composition according to claim 9, wherein the water-soluble polymer contains as another structural unit a polymerizable unsaturated hydrophobic monomer in such an amount that the water-solubility of the polymer is not impaired.
Claim 13
Dependent Claim
30 words
A composition according to claim 11, wherein the polymerizable unsaturated hydrophobic monomer is one member selected from the group consisting of vinyl acetate, acrylonitrile, styrene, alkyl acrylates, and alkyl methacrylates.
Claim 14
Dependent Claim
30 words
A composition according to claim 8, wherein the water-soluble polymer is a copolymer of 98.5 to 99.7 mole percent of acrylamide and 0.3 to 1.5 mole percent of acrylic acid.
Claim 15
Independent Claim
101 words
A method of strengthening paper comprising mixing with paper pulp a water-soluble polymer having --COOH groups, --SO 3 H groups or both said groups in a proportion of 0.05 to 10 mole percent based on the water-soluble polymer; and an amount sufficient of polyaluminum chloride of the formula [Al.sub.2 (OH).sub.n Cl.sub.6-n ].sub.m wherein n is 1-5 and m is 1-10 to interact with the --COOH or --SO 3 H groups or both of the water-soluble polymer to form a cross-linking structure among the polymer molecules through the polyaluminum chloride; and forming the paper pulp into a paper structure having increased strength.
Claim 16
Independent Claim
101 words
A method of strengthening paper comprising mixing with paper pulp a water-soluble polymer having --COOH groups, --SO 3 H groups or both said groups in a proportion of 0.05 to 10 mole percent based on the water-soluble polymer; and an amount sufficient of polyaluminum chloride of the formula [Al.sub.2 (OH).sub.n Cl.sub.6-n ].sub.m wherein n is 1-5 and m is 1-10 to interact with the --COOH or --SO 3 H groups or both of the water-soluble polymer to form a cross-linking structure among the polymer molecules through the polyaluminum chloride; and forming the paper pulp into a paper structure having increased strength.
Claim 17
Dependent Claim
9 words
A product obtained by the process of claim 14.
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) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |