Claims
- 1. A process for producing a vinylamine copolymer having the structural units comprising following formulas (I), (II), (III).[.,.]. .Iadd.and .Iaddend.(IV) .[.and (V).].: ##STR10## wherein X.crclbar. represents an anion or hydroxyl ion, R represents a hydrogen atom or a methyl group, M.sym. 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).[.,.]. .Iadd.and .Iaddend.(IV) .[.and (V).]., which comprises polymerizing a mixture of N-vinylformamide and a compound of the following general formula (VI)
- CH.sub.2 .dbd.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.
- 2. A process for producing a vinylamine copolymer having the structural units comprising the following formulas (I), (II), (III).[.,.]. .Iadd.and .Iaddend.(IV) .[.and (V).].: ##STR11## wherein X.crclbar. represents an anion, R represents a hydrogen atom or a methyl group, M.sym. 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).]. (.Iadd.IV) .Iaddend.is 0 to 8% by mole based on the total content of the structural units (III).[.,.]. .Iadd.and .Iaddend.(IV) .[.and (V).]., which comprise polymerizing a mixture of N-vinylformamide and a compound of the following general formula (VI):
- CH.sub.2 .dbd.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.
- 3. A process according to claim 2, wherein the radical polymerization initiator is from 0.01 to 1% by weight based on the monomer.
- 4. 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.degree. C.
- 5. 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.
- 6. 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.
- 7. 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.
- 8. A process according to claim 2, wherein the modification is carried out at a temperature from 40.degree. C. to 100.degree. C.
- 9. A process according to claim 2, wherein the radical polymerization initiator is an azo compound. .Iadd.10. A process for producing a vinylamine copolymer, said process comprising:
- polymerizing, in the presence of a radical polymerization initiator, a mixture of (i)N-vinylformamide and (ii) a compound of the following general formula:
- CH.sub.2 .dbd.CR--CN
- wherein R represents a hydrogen atom or a methyl group at a molar ratio from 20:80 to 95:5 and
- hydrolyzing the resultant polymer. .Iadd.11. A process for producing a vinylamine copolymer, said process comprising:
- polymerizing, in the presence of a radical polymerization initiator, a mixture of (i)N-vinylformamide and (ii) a compound of the following general formula:
- CH.sub.2 .dbd.CR--CN
- wherein R represents a hydrogen atom or a methyl group at a molar ratio from 20:80 to 95:5 and
- hydrolyzing the resultant polymer under acid conditions to modify formyl groups. .Iaddend.
Parent Case Info
This is a divisional of copending application Ser. No. 07/470,395 filed on Jan. 25, 1990, .Iadd.now U.S. Pat. No. 4,957,977, .Iaddend.which is a continuation of U.S. Ser. No. 07/065,296, filed Jun. 22, 1987, .Iadd.now abandoned.Iaddend..
US Referenced Citations (6)
Non-Patent Literature Citations (1)
Entry |
Murao et al, Chemical Abstracts 106:5657m (12 Jan. 1987) (Citing JP 61-118,406 of 5 Jun. 1986). |
Divisions (1)
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Number |
Date |
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Parent |
470395 |
Jan 1990 |
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Continuations (1)
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Number |
Date |
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65296 |
Jun 1987 |
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Reissues (1)
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Number |
Date |
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Parent |
564042 |
Aug 1990 |
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