Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-06-21
1998-05-19
Szekely, Peter A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253267, 5253268, 5253269, 5253274, 5253275, 5253276, 5253284, 5253285, 5253294, 5253297, 525387, 524 58, C08F 3200, C08F 2610, C08F 800, C08L 500
Patent
active
057537704
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an improved process for preparing hydrogen peroxide, C.sub.1 - to C.sub.4 -monopercarboxylic acid and C.sub.4 - to C.sub.18 -dipercarboxylic acid complexes in a fluidized-bed process by applying a solution of hydrogen peroxide, C.sub.1 - to C.sub.4 -monopercarboxylic acids, C.sub.4 - to C.sub.18 -dipercarboxylic acids or a mixture thereof in water or carboxylic acids to a pulverulent or pregranulated matrix in or outside the fluidized bed and simultaneous or subsequent fluidized-bed drying.
Since some of the complexes prepared by the process of the invention are new, the invention further relates to these novel substances.
U.S. Pat. No. 3,376,110 (1) and U.S. Pat. No. 3,480,557 (2) discloses water-insoluble (crosslinked) or water-soluble (uncrosslinked) hydrogen peroxide complexes of polymeric N-vinylheterocycles such as poly-N-vinylpyrrolidone and also poly-N-vinyl-2-caprolactam. These complexes can be prepared by evaporation of an aqueous suspension of polymer and hydrogen peroxide.
U.S. Pat. No. 5,077,047 (3) describes a process for preparing free-flowing pulverulent hydrogen peroxide/poly-N-vinylpyrrolidone complexes in a fluidized-bed process. The drying of the product formed can be carried out in the fluidized bed simultaneously or in a downstream step.
U.S. Pat. No. 5,190,749 (4) discloses that the fluidized-bed process from (3) can also be used for preparing hydrogen peroxide complexes from copolymers of N-vinylpyrrolidone with quaternized ammonium monomers.
Hydrogen peroxide/urea complexes can also be prepared in a fluidized-bed process according to DE-A 34 44 552 (5), with the drying of the reaction product being able to be carried out in one process step in the same apparatus or in a downstream drying step.
WO 92/17158 (7) discloses that a hydroxyalkylcellulose such as hydroxyethylcellulose can be added as foam pore enlarger to the hydrogen peroxide/poly-N-vinylpyrrolidone complexes during their preparation in a fluidized bed.
It is an object of the present invention to provide an improved preparation process for such hydrogen peroxide complexes, since the preparation processes described in the prior art are still not sufficiently efficient and economical. Furthermore, the known hydrogen peroxide/polymer complexes are deficient with regard to their properties during preparation and during use, so that there is also a need for new improved complexes of per-compounds.
We have found that this object is achieved by the process defined in the introduction for preparing hydrogen peroxide, C.sub.1 - to C.sub.4 -monopercarboxylic acid and C.sub.4 - to C.sub.18 -dipercarboxylic acid complexes in a fluidized-bed process, wherein the matrix used is N-vinylimidazole, acryl- or methacrylamidopropyl-3-sulfonic acid, acrylic or methacrylic acid or a mixture thereof as comonomer in a weight ratio of N-vinylcaprolactam to comonomer of from 20:1 to 1:20, methacrylic acid or a mixture thereof as comonomer in a weight ratio of N-vinylpyrrolidone to comonomer of from 20:1 to 1:20, heterocyclic ring by up to three C.sub.1 - to C.sub.4 -alkyl radicals and can be N-quaternized by C.sub.1 - to C.sub.4 -alkyl, derivatives thereof with the polymers A to D in a weight ratio of from 1:99 to 90:10, degradation products or derivatives thereof with N-vinylpyrrolidone homopolymers in a weight ratio of from 1:99 to 90:10, .gamma.-cyclodextrins or derivatives of these cyclodextrins or a mixture thereof with the polymers A to D or with N-vinylpyrrolidone homopolymers in a weight ratio of from 1:99 to 100:0 or - to C.sub.18 -dipercarboxylic acid complexes, N-vinylpyrrolidone homopolymers.
For the purposes of the present invention, N-vinylcaprolactam is N-vinyl-.epsilon.-caprolactam (N-vinyl-2-caprolactam), and N-vinylpyrrolidone is N-vinyl-2-pyrrolidone.
Preferred copolymers B based on N-vinylcaprolactam are N-vinylcaprolactam/N-vinylpyrrolidone bipolymers, N-vinylcaprolactam/N-vinylimidazole bipolymers, N-vinylcaprolactam/N-vinylpyrrolidone/N-vinylimidazole terpolymers, N-vinylcaprolactam/acrylic o
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Breitenbach Jorg
Grabowski Sven
Sanner Axel
BASF - Aktiengesellschaft
Szekely Peter A.
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