Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-01-31
1998-05-19
Henderson, Christopher
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525344, 525388, C08F 836, C08F 806
Patent
active
057537755
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to novel indene polymers which are obtainable by polymerization of indene or indene derivatives, subsequent sulfonation and non-chain-degrading oxidation at elevated temperatures and to the use thereof as novel dispersant in a wide range of technical fields. The present invention further relates to dye and pigment preparations including these indene polymers as dispersants.
2. Description of the Related Art
DE-A-2 659 375 (1) discloses alkali metal salts of sulfonated styrene-indene hydrocarbon resins obtainable by sulfonation of the starting styrene-indene-carbon resins with for example oleum in solution at temperatures up to 65.degree. C. They are suitable for use as superplasticizers for mineral pastes and binders, in particular for concrete.
JP-A-90/225 355 (2) recommends for use as additives for cement distillatively purified and polymerized thermal decomposition residue oils from petroleum fractions containing indenes and styrenes after sulfonation at low temperatures and neutralization.
Dye preparations or dyebaths customarily contain dispersing agents comprising ligninsulfonates, sulfonates of phenol-formaldehyde condensates or naphthalenesulfonic acid-formaldehyde condensates. The agents have a number of application disadvantages with, in particular, the amount required being too high, the dispersion stability being too low and the dyeing obtained being too weak or too unlevel. After their use as dispersants the products mentioned pass into the waste water whence they are biodegradable or bioeliminable in water treatment plants only to a small extent.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide dispersants for various industrial purposes, in particular for dye preparations and dyebaths, which, compared with existing dispersants, are appreciably eliminable or degradable and also have better application properties.
We have found that this object is achieved by sulfonated and oxidized indene polymers obtainable by ##STR2## where R.sup.1 is hydrogen, methyl or ethyl and n is 1 or 2, or of mixtures which contain the compounds I as well as other copolymerizable and/or non-polymerizable organic compounds in an amount of at least 10% by weight, to 130.degree. C., and 180.degree. C.
R.sup.1 in the formula I is preferably hydrogen or methyl, and n is preferably 1. Examples of suitable monomethylindenes are 2-, 3-, 4-, 5-, 6- and 7-methylindene.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The polymerization in step (a) is normally catalyzed by protic acids, for example sulfuric acid, or by Lewis acids, for example boron trifluoride, and it therefore generally proceeds according to ionic mechanisms. If, in the present system, all three steps (a), (b) and (c) are to be carried out in a single reaction vessel without intermediate isolation steps, i.e. as a one-pot process, it is particularly advantageous to catalyze the polymerization (a) with a small amount of the acidic sulfonating agent, preferably sulfuric acid or oleum, required later for (b). However, the polymerization can also be carried out as a continuous process in which the compounds to be polymerized and the acidic sulfonating agent are metered simultaneously into, for example, a stirred kettle cascade or a tubular reactor.
The degree of polymerization should not be too high if good application properties are to be achieved and should range from about 2 to 50, preferably from 3 to 10.
Suitable sulfonating agents for step (b) include in principle all customary agents such as chlorosulfonic acid, chlorohydrin-sulfuric acid or sulfuryl chloride. However, of particular advantage are sulfuric acid, preferably concentrated sulfuric acid, and oleum, which can have an SO.sub.3 content of up to about 90% by weight. The best results are achieved with from about 50 to 70% strength by weight oleum. The sulfonation is carried out in a conventional manner by advantageously adding the desired amount of sulfonating agent, in the present case pre
REFERENCES:
patent: 2206589 (1940-07-01), Wayne
patent: 4071493 (1978-01-01), Begou
Baus Ulf
Beckmann Eberhard
Borschel Eva-Marie
Bury Willi
Erren Stefan
BASF - Aktiengesellschaft
Henderson Christopher
LandOfFree
Sulfonated and oxidized indene polymers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sulfonated and oxidized indene polymers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sulfonated and oxidized indene polymers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1854133