Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-11-03
2000-04-11
Mullis, Jeffrey C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525409, 525534, 525540, C08F28306, D21H 1700, D21H 1733, D21H 1746
Patent
active
060489456
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to graft polymers comprising polymers, containing alkylene oxide units, and open-chain N-vinylcarboxamides, processes for their preparation and the use of the graft polymers in the production of paper, board and cardboard, as dispersants for pigments and as starch cationizing agents.
2. Description of the Background
U.S. Pat. Nos. 4,880,497 and 4,978,427 each disclose the production of paper having high dry strength and wet strength, a hydrolyzed copolymer which is obtainable by copolymerization of N-vinylformamide and ethylenically unsaturated monomers, for example vinyl acetate, vinyl propionate or an alkyl vinyl ether, and hydrolysis of from 30 to 100 mol % of the formyl groups of the copolymer with formation of amino groups being used as a strength agent either on the surface of the paper or in the paper stock prior to sheet formation. The hydrolyzed copolymers are used in amounts of from 0.1 to 5% by weight, based on dry fibers.
EP-A-0 363 319 discloses graft polymers which are obtainable by free radical polymerization of unsubstituted or N-substituted acrylamide or methacrylamide and N-vinyl-substituted amides or vinyl esters of a saturated aliphatic monocarboxylic acid in the presence of adducts of alkylene oxides with a trihydric or polyhydric aliphatic alcohol of 3 to 10 carbon atoms. The graft polymers are used as dyeing assistants for coloring cellulose fibers with substantive dyes or reactive dyes.
U.S. Pat. No. 5,334,287 discloses graft polymers which are obtainable by free radical polymerization of N-vinylcarboxamides, preferably N-vinylformamide, and, if required, other monomers in the presence of monosaccharides, oligosaccharides, polysaccharides or derivatives of each of these and, if required, hydrolysis of the polymerized N-vinylcarboxamide group with formation of vinylamine units.
The graft polymers are used as dry strength and wet strength agents in the production of paper, board and cardboard.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide novel substances. It is a further object of the present invention to provide process assistants for the production of paper, board and cardboard.
We have found that these objects are achieved, according to the invention, by graft polymers comprising polymers, containing alkylene oxide units, and ethylenically unsaturated compounds, wherein the graft polymers are obtainable by free radical polymerization of ##STR2## where R.sup.1 and R.sup.2 are each H or C.sub.1 -C.sub.6 -alkyl, (b) from 0 to 90% by weight of other monoethylenically unsaturated monomers copolymerizable with the monomers (a) and unsaturated, nonconjugated double bonds in the molecule oxide, and/or polytetrahydrofurans, subsequent elimination of the group ##STR3## from the polymerized monomers (a) of the graft polymer with formation of units of the formula ##STR4##
The present invention furthermore relates to a process for the preparation of graft polymers comprising polymers, containing alkylene oxide units, and ethylenically unsaturated compounds, wherein ##STR5## where R.sup.1 and R.sup.2 are each H or C.sub.1 -C.sub.6 -alkyl, (b) from 0 to 90% by weight of other, carboxyl-free monoethylenically unsaturated monomers copolymerizable with the monomers (a) and unsaturated, nonconjugated double bonds in the molecule oxide, and/or polytetrahydrofurans, groups ##STR6## are then eliminated from the polymerized monomers (a) of the graft polymer with formation of units of the formula ##STR7##
DETAILED DESCRIPTION OF THE INVENTION
A preferably used monomer (A) is N-vinylformamide. In a further process step, from 2 to 100%, preferably from 30 to 95% of the formyl groups of the polymerized N-vinylformamide are eliminated from the graft polymers thus obtainable, with formation of units of the formula ##STR8##
Preferably used monomer mixtures consist of from 1 to 99% by weight of N-vinylformamide and from 99 to 1% by weight of vinyl formate, vinyl acetate, vinyl propionate, ac
REFERENCES:
patent: 4880497 (1989-11-01), Pfohl et al.
patent: 4975524 (1990-12-01), Berendt
patent: 4978427 (1990-12-01), Pfohl et al.
patent: 5002587 (1991-03-01), Berendt
patent: 5089570 (1992-02-01), Rauterkus et al.
patent: 5334287 (1994-08-01), Hartmann et al.
Fieser, Organic Chemistry, third edition p. 399 and 401, publication date unavailable.
Institut fuer Textilchemie, CAP/US An 1992:492196, abstracting DE 4030358 A1, 1992.
Denzinger Walter
Lorencak Primoz
Monch Dietmar
Nilz Claudia
Rubenacker Martin
BASF - Aktiengesellschaft
Mullis Jeffrey C.
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