Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-10-24
1998-05-19
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525262, 525278, 525279, 525296, C08F27100
Patent
active
057537593
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to graft polymers which contain N-vinyl units and have monoethylenically unsaturated monomers grafted onto polymers containing vinylamine and/or open-chain N-vinylamide units, processes for their preparation and their use as dispersants, as additives for detergents and cleaning agents, as strength agents for paper and as soil stabilizers.
EP-B-0 071 050 discloses linear, basic polymers which contain polymerized vinylamine and vinylformamide units. These polymers are prepared by homopolymerization of N-vinylformamide and subsequent partial elimination of formyl groups by the action of acids or bases, and are used as drainage aids and retention aids in papermaking.
Copolymers of N-vinylcarboxamides and other monoethylenically unsaturated compounds, such as acrylic acid, acrylates, vinyl acetate, N-vinylpyrrolidone or acrylonitrile, are likewise described in the literature, as are the modified copolymers which are obtainable by the action of acids or bases and in which some or all of the carboxamido groups can be eliminated from the polymerized N-vinylcarboxamides and in which the polymerized comonomers may be hydrolyzed, cf. EP-B-0 216 387, EP-B-0 251 182, EP-A-0 528 409, WO-A-82/02073, JP-A-84/033 312, JP-A-84/039 399, EP-A-0 337 310 and DE-A-4 322 854.
Partially or completely hydrolyzed copolymers of N-vinylformamide are used, for example, as dry and wet strength agents in paper-making, as fixatives and as promoters for diketene sizing.
It is an object of the present invention to provide novel substances.
We have found that this object is achieved, according to the invention, by graft polymers which contain N-vinyl units and in which the grafting base is a polymer which contains in each case at least 5% by weight of units of the formulae ##STR2## or is obtainable by polymerizing N-vinylformamide alone or together with other copolymerizable monomers and by hydrolyzing 100 % of the units of the formula I incorporated in the polymer, monoethylenically unsaturated monomers are grafted onto the grafting base in a weight ratio of from 100:1 to 1:100 and the graft polymers have K values of at least 7 (determined according to H. Fikentscher in 5 % strength by weight aqueous solution at 25.degree. C. and pH 7).
The graft polymers containing N-vinyl units are prepared by free radical polymerization of monoethylenically unsaturated monomers in the presence of polymers which contain in each case at least 5% by weight of units of the formulae I and II, as the grafting base, in a weight ratio of from 100:1 to 1:100.
The graft polymers thus obtainable are used as dispersants for pigments, as additives for detergents and cleaning agents, as strength agents for paper, as soil stabilizers and for fertilizer compaction.
The grafting bases used are polymers which contain at least 5% by weight of polymerized units of the formula ##STR3## units of the formula ##STR4## The units of the formula I are based on N-vinylformamide as the monomer.
For the preparation of polymers, N-vinylformamide may be used alone or together with other copolymerizable monomers. Processes for the preparation of such copolymers are known (cf. the abovementioned publications).
Examples of other suitable copolymerizable monomers are monoethylenically unsaturated carboxylic acids of 3 to 8 carbon atoms, such as acrylic acid, methacrylic acid, dimethacrylic acid, ethacrylic acid, maleic acid, citraconic acid, methylene-malonic acid, allylacetic acid, vinylacetic acid, crotonic acid, fumaric acid, mesaconic acid and itaconic acid. From this group of monomers, acrylic acid, methacrylic acid, maleic acid or mixtures of the stated carboxylic acids, in particular mixtures of acrylic acid and maleic acid or mixtures of acrylic acid and methacrylic acid, are preferably used. The monoethylenically unsaturated carboxylic acids may be used in the form of the free acids and, where available, of the anhydrides, or in partially or completely neutralized form in the copolymerization. These monomers are neutralized using, preferably, alkali m
REFERENCES:
patent: 4970342 (1990-11-01), Fauss et al.
patent: 5225088 (1993-07-01), Moench et al.
patent: 5324787 (1994-06-01), Pinschmidt et al.
patent: 5334287 (1994-08-01), Hartmann et al.
patent: 5373065 (1994-12-01), Kitazawa et al.
patent: 5543459 (1996-08-01), Hartmann et al.
patent: 5578678 (1996-11-01), Hartmann et al.
Denzinger Walter
Hartmann Heinrich
Nilz Claudia
BASF - Aktiengesellschaft
Schofer Joseph L.
LandOfFree
Graft polymers containing N-vinyl units, their preparation and t does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Graft polymers containing N-vinyl units, their preparation and t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Graft polymers containing N-vinyl units, their preparation and t will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1854000