Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-08-19
1998-09-08
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...
525253, 525254, 252244, C08F 224, C08F 232, C11D 337
Patent
active
058046623
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to agglomerated, finely divided, crosslinked vinylimidazole copolymers obtainable by free-radically initiated polymerization of N-vinylimidazoles of the formula ##STR2## where R, R.sup.1 and R.sup.2 are identical or different and each is H, C.sub.1 -C.sub.4 -alkyl or phenyl, with at least one crosslinker, one emulsifier to stabilize the water-in-oil monomer emulsion, azeotropic distillative removal of the water from the water-in-oil polymer suspension, and isolation of the polymers, processes for their preparation, and their use in detergents for inhibiting the transfer of dye during the wash.
DESCRIPTION OF THE BACKGROUND
DE-A-3 324 835 discloses crosslinked 1-vinylimidazole polymers prepared by polymerizing 1-vinylimidazole with at least one crosslinker in the aqueous phase of a water-in-oil emulsion in the presence of a lipophilic protective colloid to stabilize the water-in-oil monomer emulsion and of a free-radical polymerization initiator and subsequent azeotropic distillative removal of the water from the water-in-oil polymer suspension and isolation of the beadlike polymers. The water-in-oil monomer emulsion is stabilized using lipophilic protective colloids such as, for example, cellulose derivatives, polymeric maleic acid derivatives with alkyl vinyl ethers, sorbitan esters, ethoxylated fatty acid amides, fatty glyceryl esters and reaction products of polybutadiene oils containing allyl hydrogen atoms with maleic anhydride. The products are beadlike crosslinked vinylimidazole copolymers having an average particle diameter of from 40 to 150 .mu.m.
EP-A-0 412 388 discloses finely divided agglomerated polymer powders prepared by polymerizing water-soluble monomers in the aqueous phase of a water-in-oil emulsion in the presence of water-in-oil emulsifiers and of free-radical polymerization initiators, azeotropic removal of water from the water-in-oil polymer suspensions, agglomeration of the primary particles in the presence of protective colloids, and isolation of the suspended, agglomerated polymer powders. Suitable water-soluble monomers are said to include, for example, mixtures of N-vinylformamide and N-vinylimidazole. The water-soluble monomers can optionally be polymerized in the presence of from 50 to 5,000 ppm of at least one crosslinker. The agglomerated particles have an average particle size of at least 50 .mu.m. On introduction into water they readily disintegrate into the primary particles, which have an average particle size of from 0.1 to 20 .mu.m.
EP-A 0 623 630 discloses water-in-oil polymer emulsions obtainable by polymerizing water-soluble monoethylenically unsaturated monomers in the aqueous phase of a water-in-oil emulsion. The resulting water-soluble polymers have an average particle size of from 0.1 to 20 .mu.m. Suitable monomers are also said to include N-vinylpyrrolidone and N-vinylimidazole. The oil phase of the water-in-oil polymer emulsions contains at least 50% by weight of an oil of vegetable or animal origin. The water-in-oil monomer emulsion is stabilized by means of an emulsifier mixture consisting of the following components: formula (A-COO).sub.m -B, where A is a hydrophobic polymer which has a molecular weight of more than 500 g/mol and is based on a poly(hydroxycarboxylic acid), B is a bifunctional hydrophilic polymer which has a molecular weight of more than 500 g/mol and is based on a polyalkylene oxide, and m is at least 2, and molecular weight <1,000 g/mol, for example sorbitan monooleate.
The water-in-oil polymer emulsions additionally contain a wetting agent which, on introduction of the emulsions into water, brings about an inversion of the phases and liberates the polymers, so that they dissolve relatively rapidly. However, the polymers are not isolated in solid form.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide agglomerated, finely divided crosslinked vinylimidazole polymers.
We have found that this object is achieved according to the present invention by
REFERENCES:
patent: 4576973 (1986-03-01), Keil et al.
patent: 5622926 (1997-04-01), Schade et al.
Schade Christian
Schneider Karl-Heinrich
BASF - Aktiengesellschaft
Cheng Wu C.
Schofer Joseph L.
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