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US5334287A
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Graft polymers of natural substances containing saccharide structures or derivatives thereof and ethylenically unsaturated compounds and their use
Assignee: BASF SE
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Filing: 1992-07-17
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Granted: 1994-08-02
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Expires: 2012-07-17
Abstract
Abstract Graft polymers are obtainable by free radical polymerization of (A) monomers or monomer mixtures of (a) from 10 to 100% by weight of open-chain N-vinylcarboxamides (b) from 0 to 90% by weight of other, carboxyl-free monoethylenically unsaturated monomers which are copolymerizable with the monomers (a) and (c) from 0 to 5% by weight of monomers containing two or more ethylenically unsaturated, non-conjugated double bonds in the molecule, in the presence of (B) natural substances containing saccharide structures, such as mono-, oligo- and polysaccharides, in a weight ratio (A):(B) of from 95:5 to 20:80 and, if required, subsequent hydrolysis of the amido groups of the polymerized monomers (a) of the graft polymer with formation of amino groups, and said polymers are used as dry and wet strength agents for paper, board and cardboard.
Inventors
- 👤 Heinrich Hartmann
- 👤 Walter Denzinger
- 👤 Michael Kroener
- 👤 Claudia Nilz
- 👤 Friedrich Linhart
- 👤 Andreas Stange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:11
CPC Classifications
C; C08; C08F; C08F251/00; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/35; D21H17/37; D21H17/375; D21H21/00; D21H21/14; D21H21/18
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
122 words
A graft polymer prepared by polymerization of monomers (A) mixtures of N-vinylformamide having formyl groups and vinylacetate having acetate groups; in the presence of (B) a compound selected from the group consisting of monosaccharides, oligosaccharides, polysaccharides, oxidatively, hydrolytically or enzymatically degraded polysaccharide, oxidized hydrolytically degraded or oxidized enzymatically degraded polysaccharides, chemically modified mono-, oligo- or polysaccharides and mixtures thereof; in a weight ratio (A):(B) of from 95:5 to 20:80; followed by elimination of from 2 to 100% of the formyl groups of the polymerized N-vinylformamide of the graft polymer with formation of moieties of the formula ##STR11## and elimination of from 2-100% of the acetate groups of the polymerized vinylacetate of the graft polymer with formation of moieties of the formula ##STR12##
Claim 2
Dependent Claim
122 words
A graft polymer prepared by polymerization of monomers (A) mixtures of N-vinylformamide having formyl groups and vinylacetate having acetate groups; in the presence of (B) a compound selected from the group consisting of monosaccharides, oligosaccharides, polysaccharides, oxidatively, hydrolytically or enzymatically degraded polysaccharide, oxidized hydrolytically degraded or oxidized enzymatically degraded polysaccharides, chemically modified mono-, oligo- or polysaccharides and mixtures thereof; in a weight ratio (A):(B) of from 95:5 to 20:80; followed by elimination of from 2 to 100% of the formyl groups of the polymerized N-vinylformamide of the graft polymer with formation of moieties of the formula ##STR11## and elimination of from 2-100% of the acetate groups of the polymerized vinylacetate of the graft polymer with formation of moieties of the formula ##STR12##
Claim 3
Dependent Claim
53 words
The graft polymer of claim 1, wherein from 30 to 95% of the formyl groups of the polymerized N-vinylformamide of the graft polymer are eliminated from the graft polymer; and from 35 to 95% of the polymerized acetate groups of the polymerized vinylacetate of the graft copolymer are eliminated from the graft copolymer.
Claim 4
Dependent Claim
33 words
The graft copolymer of claim 2, wherein a monomer mixture consisting of from 1-99 wt % N-vinylformamide and from 99-1 wt % of vinylacetate relative to said mixture is used as monomer (A).
Claim 5
Dependent Claim
33 words
The graft copolymer of claim 1, wherein said graft copolymer has a K value of 8-250 measured in a 1% strength aqueous solution of said copolymer at pH 7 and at 25° C.
Claim 6
Dependent Claim
30 words
The graft copolymer of claim 4, wherein said K value is from 10-150 measured in a 1% strength aqueous solution of said copolymer at pH 7 and at 25° C.
Claim 7
Dependent Claim
40 words
A process for the production of paper, board and cardboard, which comprises adding to the paper stock before sheet formation of from 0.1 to 10% by weight, based on dry fiber, of a graft polymer as claimed in claim 1.
Claim 8
Dependent Claim
16 words
The graft copolymer of claim 1, wherein the weight ratio (A):(B) is from 60:40 to 20:80.
Claim 9
Dependent Claim
90 words
A graft polymer prepared by polymerization of monomers (A) N-vinylformamide having formyl groups; in the presence of (B) a compound selected from the group consisting of monosaccharides, oligosaccharides, polysaccharides, oxidatively, hydrolytically or enzymatically degraded polysaccharide, oxidized hydrolytically degraded or oxidized enzymatically degraded polysaccharides, chemically modified mono-, oligo- or polysaccharides and mixtures thereof; in a weight ratio (A):(B) of from 95:5 to 20:80; followed by elimination of from 2 to 97.3% of the formyl groups of the polymerized N-vinylformamide of the graft polymer with formation of moieties of the formula ##STR13##
Claim 10
Dependent Claim
90 words
A graft polymer prepared by polymerization of monomers (A) N-vinylformamide having formyl groups; in the presence of (B) a compound selected from the group consisting of monosaccharides, oligosaccharides, polysaccharides, oxidatively, hydrolytically or enzymatically degraded polysaccharide, oxidized hydrolytically degraded or oxidized enzymatically degraded polysaccharides, chemically modified mono-, oligo- or polysaccharides and mixtures thereof; in a weight ratio (A):(B) of from 95:5 to 20:80; followed by elimination of from 2 to 97.3% of the formyl groups of the polymerized N-vinylformamide of the graft polymer with formation of moieties of the formula ##STR13##
Claim 11
Dependent Claim
29 words
The graft polymer of claim 8, wherein from 30 to 95% of the formyl groups of the polymerized N-vinylformamide of the graft polymer are eliminated from the graft polymer.
Claim 12
Dependent Claim
40 words
A process for the production of paper, board and cardboard, which comprises adding to the paper stock before sheet formation of from 0.1 to 10% by weight, based on dry fiber, of a graft polymer as claimed in claim 8.
Claim 13
Dependent Claim
16 words
The graft copolymer of claim 8, wherein the weight ratio (A):(B) is from 80:20 to 20:80.
Claim 14
Dependent Claim
17 words
The graft copolymer of claim 11, wherein the weight ratio of (A):(B) is from 60:40 to 20:80.
Claim 15
Dependent Claim
34 words
The graft copolymer of claim 8, wherein said graft copolymer has a K value of from 8-250 measured in a 1% strength aqueous solution of said copolder at pH 7 and at 25° C.
Claim 16
Dependent Claim
30 words
The graft copolymer of claim 13, wherein said K value is from 10-150 measured in a 1% strength aqueous solution of said copolymer at pH 7 and at 25° C.
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