US5698627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive for papermaking
Assignee: Japan PMC Corp
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Filing: 1996-03-29
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Granted: 1997-12-16
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Expires: 2016-03-29
Abstract
Abstract A novel additive for papermaking is disclosed. The additive comprises an aqueous solution of a copolymer obtained by reacting (a) an acrylamide, (b) a vinyl monomer which is copolymerizable with component (a) and has a cationic group, (c) at least one of vinyl monomers which are copolymerizable with component (a) and (b) and have 2, 3 or 4 carboxyl groups in a molecule thereof and/or a salt thereof, optionally (e) a nonionic monomer which is copolymerizable with components (a), (b) and (c) if desired, and (d) a cross-linking compound, in the presence of (f) at least one of ethylene glycol, diethylene glycol, diethanolamine and glycerin. This novel additive for papermaking is able to achieve excellent freeness and retention in the process of papermaking and provides paper with increased strength.
Inventors
- 👤 Tadayoshi Oguni
- 👤 Satoshi Takizawa
- 👤 Kiyoshi Iwai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:30
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H21/00; D21H21/06; D21H21/10; D21H17/34; D21H17/36; D21H17/37; D21H17/41; D21H17/44; D21H17/45; D21H17/455
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
174 words
An additive for papermaking comprising an aqueous solution of a copolymer obtained by reacting 98-60 mol % of (a) an acrylamide, 1-20 mol % of (b) a vinyl monomer which is copolymerizable with component (a) and has a cationic group, 0.5-20 mol % of (c) at least one of vinyl monomers which are copolymerizable with components (a) and (b) and have 2, 3 or 4 carboxyl groups in a molecule thereof and/or a salt thereof, with the total molar percent of components (a), (b) and (c) being 100 mol %, and 0.005-5 mol % of (d) a .cross-linking compound, with the mol % of (d) being relative to the total molar percent of components (a), (b) and (c) being 100 mol %, wherein components (a), (b), (c) and (d) are reacted in the presence of 0.1-5 mol % of (f) at least one of ethylene glycol, diethylene glycol, diethanolamine and glycerin with the mol % of (f) being relative to the total molar percent of components (a), (b) and (c) being 100 mol %.
Claim 2
Dependent Claim
174 words
An additive for papermaking comprising an aqueous solution of a copolymer obtained by reacting 98-60 mol % of (a) an acrylamide, 1-20 mol % of (b) a vinyl monomer which is copolymerizable with component (a) and has a cationic group, 0.5-20 mol % of (c) at least one of vinyl monomers which are copolymerizable with components (a) and (b) and have 2, 3 or 4 carboxyl groups in a molecule thereof and/or a salt thereof, with the total molar percent of components (a), (b) and (c) being 100 mol %, and 0.005-5 mol % of (d) a .cross-linking compound, with the mol % of (d) being relative to the total molar percent of components (a), (b) and (c) being 100 mol %, wherein components (a), (b), (c) and (d) are reacted in the presence of 0.1-5 mol % of (f) at least one of ethylene glycol, diethylene glycol, diethanolamine and glycerin with the mol % of (f) being relative to the total molar percent of components (a), (b) and (c) being 100 mol %.
Claim 3
Dependent Claim
180 words
The additive for papermaking as described in claim 1, which comprises an aqueous solution of a copolymer obtained by reacting 96-70 mol % of (a) an acrylamide, 2-15 mol % of (b) a vinyl monomer which is copolymerizable with component (a) and has a cationic group, 1-15 mol % of (c) at least one of vinyl monomers which are copolymerizable with components (a) and (b) and have 2, 3 or 4 carboxyl groups in a molecule thereof and/or a salt thereof, with the total molar percent of components (a), (b) and (c) being 100 mol %, and 0.0075-2.5 mol % of (d) a cross-linking compound, with the mol % of (d) being relative to the total molar amount of components (a), (b) and (c) being 100 mol %, wherein components (a), (b), (c) and (d) are reacted in the presence of 0.2-3 mol % of (f) at least one of ethylene glycol, diethylene glycol, diethanolamine and glycerin with the mol % of (f) being relative to the total molar amount of components (a), (b) and (c) being 100 mol %.
Claim 4
Dependent Claim
181 words
The additive for papermaking as described in claim 2, which comprises an aqueous solution of a copolymer obtained by reacting 95-80 mol % of (a) an acrylamide, 3-10 mol % of (b) a vinyl monomer which is copolymerizable with component (a) and has a cationic group, 1.5-10 mol % of (c) at least one of vinyl monomers which are copolymerizable with components (a) and (b) and have 2, 3 or 4 carboxyl groups in a molecule thereof and/or a salt thereof, with the total molar percent of components (a) , (b) and (c) being 100 mol %, and 0.01-1.5 mol % of (d) a cross-linking compound, with the mol % of (d) being relative to the total molar amount of components (a), (b) and (c) being 100 mol %, wherein components (a), (b), (c) and (d) are reacted in the presence of 0.3-2 mol % of (f) at least one of ethylene glycol, diethylene glycol, diethanolamine and glycerin with the mol % of (d) being relative to the total molar amount of components (a), (b) and (c) being 100 mol %.
Claim 5
Dependent Claim
198 words
An additive for papermaking comprising an aqueous solution of a copolymer obtained by reacting 98-60 mol % of (a) an acrylamide, 1-20 mol % of (b) a vinyl monomer which is copolymerizable with component (a) and has a cationic group, 0.5-20 mol % of (c) at least one of vinyl monomers which are copolymerizable with components (a) and (b) and have 2, 3 or 4 carboxyl groups in a molecule thereof and/or a salt thereof, 0.1-20 mol % of (e) a nonionic vinyl monomer which is copolymerizable with the above components (a), (b) and (c), with the total molar percent of components (a), (b), (c) and (e) being 100 mol % and 0.005-5 mol % of (d) a cross-linking compound with the mol % of (d) being relative to the total molar percent of components (a), (b), (c) and (e) being 100 mol %, wherein components (a), (b), (c), (d) and (e) are reacted in the presence of 0.1-5 mol % of (f) at least one of ethylene glycol, diethylene glycol, diethanolamine and glycerin, with the mol % of (f) being relative to the total molar percent of components (a), (b), (c) and (e) being 100 mol %.
Claim 6
Dependent Claim
198 words
An additive for papermaking comprising an aqueous solution of a copolymer obtained by reacting 98-60 mol % of (a) an acrylamide, 1-20 mol % of (b) a vinyl monomer which is copolymerizable with component (a) and has a cationic group, 0.5-20 mol % of (c) at least one of vinyl monomers which are copolymerizable with components (a) and (b) and have 2, 3 or 4 carboxyl groups in a molecule thereof and/or a salt thereof, 0.1-20 mol % of (e) a nonionic vinyl monomer which is copolymerizable with the above components (a), (b) and (c), with the total molar percent of components (a), (b), (c) and (e) being 100 mol % and 0.005-5 mol % of (d) a cross-linking compound with the mol % of (d) being relative to the total molar percent of components (a), (b), (c) and (e) being 100 mol %, wherein components (a), (b), (c), (d) and (e) are reacted in the presence of 0.1-5 mol % of (f) at least one of ethylene glycol, diethylene glycol, diethanolamine and glycerin, with the mol % of (f) being relative to the total molar percent of components (a), (b), (c) and (e) being 100 mol %.
Claim 7
Dependent Claim
204 words
The additive for papermaking as claimed in claim 4, which comprises an aqueous solution of a copolymer obtained by reacting 96-70 mol % of (a) an acrylamide, 2-15 mol % of (b) a vinyl monomer which is copolymerizable with component (a) and has a cationic group, 1-15 mol % of (c) at least one of vinyl monomers which are copolymerizable with components (a) and (b) and have 2, 3 or 4 carboxyl groups in a molecule thereof and/or a salt thereof, 0.2-10 mol % of (e) a nonionic vinyl monomer which is copolymerizable with the above components (a), (b) and (c), with the total molar percent of components (a), (b), (c) and (e) being 100 mol % and 0.0075-2.5 mol % of (d) a cross-linking compound with the mol % of (d) being relative to the total molar percent of components (a), (b), (c) and (e) being 100 mol %, wherein components (a), (b), (c), (d) and (e) are reacted in the presence of 0.2-3 mol % of (f) at least one of ethylene glycol, diethylene glycol, diethanolamine and glycerin, with the mol % of (f) being relative to the total molar percent of components (a), (b), (c) and (e) being 100 mol %.
Claim 8
Dependent Claim
204 words
The additive for papermaking as claimed in claim 5, which comprises an aqueous solution of a copolymer obtained by reacting 95-80 mol % of (a) an acrylamide, 3-10 mol % of (b) a vinyl monomer which is copolymerizable with component (a) and has a cationic group, 1.5-10 mol % of (c) at least one of vinyl monomers which are copolymerizable with components (a) and (b) and have 2, 3 or 4 carboxyl groups in a molecule thereof and/or a salt thereof, 0.5-7.5 mol % of (e) a nonionic vinyl monomer which is copolymerizable with the above components (a), (b) and (c), with the total molar percent of components (a), (b), (c) and (e) being 100 mol %, and 0.01-1.5 mol % of (d) a cross-linking compound, with the mol % of (d) being relative to the total molar percent of components (a), (b), (c) and (e) being 100 mol % wherein components (a), (b), (c), (d) and (e) are reacted in the presence of 0.3-2 mol % of (f) at least one of ethylene glycol, diethylene glycol, diethanolamine and glycerin, with the mol % of (f) being relative to the total molar percent of components (a), (b), (c) and (e) being 100 mol %.
Claim 9
Dependent Claim
31 words
The additive for papermaking as described in claim 1, wherein component (a) is selected from the group consisting of acrylamide, methacrylamide, N-methylacrylamide, N-methylmethacrylamide, N-ethylacrylamide, N-ethylmethacrylamide, N-isopropylacrylamide, N-isopropylmethacrylamide, N,N-dimethylacrylamide, N,N-dimethylmethacrylamide and N-t-octylmethacrylamide.
Claim 10
Dependent Claim
23 words
The additive for papermaking as described in claim 7, wherein component (a) is selected from the group consisting of acrylamide, methacrylamide and N,N-dimethylacrylamide.
Claim 11
Dependent Claim
41 words
The additive for papermaking as described in claim 1, wherein component (b) is selected from the group consisting of dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate, dimethylaminopropylacrylamide, 3-(acryloylamino)propyl!trimethylammonium chloride, 2-(methacryloyloxy)ethyl!trimethylammonium chloride, 2-(acryloyloxy)ethyl!trimethylammonium chloride, 2-(methacryloyloxy)ethyl!dimethylbenzylammonium chloride, 2-(acryloyloxy)ethyl!dimethylbenzylammonium chloride, 3-(acryloylamino)propyl!dimethylbenzylammonium chloride, 2-hydroxy-N,N,N,N',N'-pentamethyl-N'- 3-{1-oxo-2-propenyl)amino}propyl!-1,3-propanediaminium dichloride and diallylamine.
Claim 12
Dependent Claim
34 words
The additive for papermaking as described in claim 9, wherein component (b) is selected from the group consisting of dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate, dimethylaminopropylacrylamide, 2-(acryloyloxy)ethyl!dimethylbenzylammonium chloride, 2-(methacryloyloxy)ethyl!dimethylbenzylammonium chloride, 3-(acryloylamino)propyl!dimethylbenzylammonium chloride and 2-hydroxy-N,N,N,N',N'-pentamethyl-N'- 3-{(1-oxo-2-propenyl)amino}propyl!-1,3-propanediaminium dichloride.
Claim 13
Dependent Claim
38 words
The additive for papermaking as described in claim 1, wherein component (c) is selected from the group consisting of maleic acid, fumaric acid, itaconic acid, muconic acid, citraconic acid, aconic acid, 4-pentene-1,2,3,4-tetracarboxylic acid, 3-butene-1,2,3-tricarboxylic acid and 4-pentene-1,2,4-tricarboxylic acid.
Claim 14
Dependent Claim
30 words
The additive for papermaking as described in claim 11, wherein component (c) is selected from the group consisting of maleic acid, fumaric acid, itaconic acid, 3-butene-1,2,3-tricarboxylic acid and 4-pentene-1,2,4-tricarboxylic acid.
Claim 15
Dependent Claim
41 words
The additive for papermaking as described in claim 1, wherein component (d) is selected from the group consisting of ethyleneglycol diacrylate, ethyleneglycol dimethacrylate, methylene-bis-acrylamide, hexamethylene-bis-acrylamide, divinyl adipate, allyl acrylate, diallylacrylamide, divinylbenzene, 1,3,5-triacryloylhexahydro-S-triazine, triallyl isocyanurate, tetramethylolmethane tetraacrylate, tetramethylolmethane-tri-β-aziridinyl propionate, 3-methacryloxymethyltrimethoxysilane and 2-acrylamide-2-methylpropyltrimethoxysilane.
Claim 16
Dependent Claim
29 words
The additive for papermaking as described in claim 13, wherein component (d) is selected from the group consisting of methylene-bis-acrylamide, 1,3,5-triacryloyl-hexahydro-S-triazine, triallyl isocyanurate, tetramethylolmethane tetraacrylate, tetramethylolmethane-tri-β-aziridinyl propionate and 3-methacryloxymethyltrimethoxysilane.
Claim 17
Dependent Claim
36 words
The additive for papermaking as described in claim 4, wherein component (e) is selected from the group consisting of acrylonitrile, styrene, vinyl acetate, vinyl propionate, methylvinylether, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate and methacrylonitrile.
Claim 18
Dependent Claim
28 words
The additive for papermaking as described in claim 15, herein component (e) is selected from the group consisting of acrylonitrile, styrene, vinyl acetate, methyl methacrylate and ethyl methacrylate.
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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) | 2000-12-15 | 2001-06-16 | 2001-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-15 | 2005-06-16 | 2005-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-15 | 2009-06-16 | 2009-12-16 | $7700.00 | Window Closed / Lapsed |