US5064909A
Expired / Lapsed
US
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Vinylamine copolymer, flocculating agent and paper strength increasing agent using the same, as well as process for producing the same
Assignee: Mitsubishi Chemical Corp
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Filing: 1990-08-07
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Granted: 1991-11-12
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Expires: 2010-08-07
Abstract
Abstract Disclosed herein is a vinylamine copolymer having the structural units represented by the following formulas (I), (II), (III), (IV) and (V): ##STR1## wherein x.sup.⊖ represents an anion or hydroxyl ion, R represents a hydrogen atom or a methyl group, M.sup.⊕ represents a hydrogen ion or a monovalent cation, in which the molar fraction of the structural unit (I) is 5 to 85% by mole, the molar fraction of the structural unit (II) is 2 to 85% by mole, the molar fraction of the structural unit (III) is 5 to 80% by mole, the molar fraction of the structural unit (IV) is 0 to 40% by mole, all of said molar fractions being based on the vinylamine copolymer, and the molar fraction of the structural unit (V) is 0 to 8% by mole which is based on the total content of the structural units (III), (IV), and (V), a flocculating agent and a paper strength increasing agent using the vinylamine copolymer, and a process for producing the vinylamine copolymer.
Inventors
- 👤 Takaharu Itagaki
- 👤 Mitsuaki Shiraga
- 👤 Shigeru Sawayama
- 👤 Kohichi Satoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:10
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08; C08F; C08F226/00; C08F226/02; C08F8/00; C08F8/44; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/37; D21H17/375; D21H17/41; D21H17/42; D21H17/43; D21H17/44; D21H17/45; D21H17/455; C08F2810/00; C08F2810/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
192 words
A process for producing a vinylamine copolymer having the structural units comprising following formulas (I), (II), (III), (IV) and (V): ##STR10## wherein X⊖ represents an anion or hydroxyl ion, R represents a hydrogen atom or a methyl group, M⊕ represents a hydrogen ion or a monovalent cation, in which the molar fraction of the structural unit (I) is 5 to 85% by mole, the molar fraction of the structural unit (II) is 2 to 85% by mole, the molar fraction of the structural unit (III) is 5 to 80% by mole, the molar fraction of the structural unit (IV) is 0 to 40% by mole, and the molar fraction of the structural unit (V) is 0 to 8% by mole based on the total content of the structural units (III), (IV) and (V), which comprises polymerizing a mixture of N-vinylformamide and a compound of the following general formula (VI) CH 2 ═CR--CN (VI) (wherein R represents a hydrogen atom or a methyl group) at a molar ratio from 20:80 to 95:5 in the presence of a radical polymerization initiator, and then modifying formyl groups in the resultant polymer under an acidic condition.
Claim 2
Dependent Claim
192 words
A process for producing a vinylamine copolymer having the structural units comprising following formulas (I), (II), (III), (IV) and (V): ##STR10## wherein X⊖ represents an anion or hydroxyl ion, R represents a hydrogen atom or a methyl group, M⊕ represents a hydrogen ion or a monovalent cation, in which the molar fraction of the structural unit (I) is 5 to 85% by mole, the molar fraction of the structural unit (II) is 2 to 85% by mole, the molar fraction of the structural unit (III) is 5 to 80% by mole, the molar fraction of the structural unit (IV) is 0 to 40% by mole, and the molar fraction of the structural unit (V) is 0 to 8% by mole based on the total content of the structural units (III), (IV) and (V), which comprises polymerizing a mixture of N-vinylformamide and a compound of the following general formula (VI) CH 2 ═CR--CN (VI) (wherein R represents a hydrogen atom or a methyl group) at a molar ratio from 20:80 to 95:5 in the presence of a radical polymerization initiator, and then modifying formyl groups in the resultant polymer under an acidic condition.
Claim 3
Dependent Claim
218 words
A process for producing a vinylamine copolymer having the structural units comprising the following formulas (I), (II), (III), (IV) and (V): ##STR11## wherein X⊖ represents an anion, R represents a hydrogen atom or a methyl group, M⊕ represents a hydrogen ion or a monovalent cation, in which the molar fraction of the structural unit (I) is 5 to 85% by mole, the molar fraction of the structural unit (II) is 2 to 85% by mole, the molar fraction of the structural unit (II) is 5 to 80% by mole, the molar fraction of the structural unit (IV) is 0 to 40% by mole, all of said molar fractions being based on the vinylamine copolymer, and the molar fraction of the structural unit (V) is 0 to 8% by mole based on the total content of the structural units (III), (IV) and (V), which comprise polymerizing a mixture of N-vinylformamide and a compound of the following general formula (VI): CH.sub.2 ═CR--CN (VI) wherein R represent a hydrogen atom or a methyl group) at a molar ratio from 20:80 to 95:5 in the presence of a radical polymerization initiator to obtain an N-vinylformamide copolymer, and then modifying the thus obtained N-vinylformamide copolymer under an acidic condition in the presence of a modifying agent to obtain the vinylamine copolymer defined above.
Claim 4
Dependent Claim
218 words
A process for producing a vinylamine copolymer having the structural units comprising the following formulas (I), (II), (III), (IV) and (V): ##STR11## wherein X⊖ represents an anion, R represents a hydrogen atom or a methyl group, M⊕ represents a hydrogen ion or a monovalent cation, in which the molar fraction of the structural unit (I) is 5 to 85% by mole, the molar fraction of the structural unit (II) is 2 to 85% by mole, the molar fraction of the structural unit (II) is 5 to 80% by mole, the molar fraction of the structural unit (IV) is 0 to 40% by mole, all of said molar fractions being based on the vinylamine copolymer, and the molar fraction of the structural unit (V) is 0 to 8% by mole based on the total content of the structural units (III), (IV) and (V), which comprise polymerizing a mixture of N-vinylformamide and a compound of the following general formula (VI): CH.sub.2 ═CR--CN (VI) wherein R represent a hydrogen atom or a methyl group) at a molar ratio from 20:80 to 95:5 in the presence of a radical polymerization initiator to obtain an N-vinylformamide copolymer, and then modifying the thus obtained N-vinylformamide copolymer under an acidic condition in the presence of a modifying agent to obtain the vinylamine copolymer defined above.
Claim 5
Dependent Claim
22 words
A process according to claim 2, wherein the radical polymerization initiator is from 0.01 to 1% by weight based on the monomer.
Claim 6
Dependent Claim
26 words
A process according to claim 2, wherein the polymerizing reaction is carried out in an inert gas stream at a temperature from 30 to 100° C.
Claim 7
Dependent Claim
59 words
A process according to claim 2, wherein the modification is carried out under an acidic condition by (1) a method of hydrolyzing in water, (2) a method of hydrolyzing in a hydrophilic solvent of a water-containing alcohol or (3) a method of subjecting to alcohol-addition degration and then modifying while separating the formyl groups as esters of formic acid.
Claim 8
Dependent Claim
29 words
A process according to claim 2, wherein the modifying agent is hydrochloric acid, bromic acid, hydrofluoric acid, sulfuric acid, nitric acid, phosphoric acid, sulfamic acid or alkane sulfonic acid.
Claim 9
Dependent Claim
24 words
A process according to claim 2, wherein the modifying agent is from 0.1 to 2 molar times to the formyl group in the polymer.
Claim 10
Dependent Claim
21 words
A process according to claim 2, wherein the modification is carried out at a temperature from 40° C. to 100° C.
Claim 11
Dependent Claim
15 words
A process according to claim 2, wherein the radical polymerization initiator is an azo compound.
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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) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |