Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1997-07-14
1999-07-13
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526126, 526127, 526134, 526170, 526346, 5263472, 526943, 502103, 502109, 502152, 502153, C08F 4642, C08F 1204
Patent
active
059228199
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for preparing polymers of vinylaromatic compounds at from 0 to 150.degree. C. in the presence of catalyst systems.
The present invention further relates to the use of the polymers obtainable in this way for producing moldings.
Owing to their property profile, polymers of vinylaromatic compounds, in particular polystyrenes, are used in many areas, for example as packaging materials or as insulating coatings for metals or plastics, specifically in electrical applications.
A process for preparing isotactic polystyrene is described in GB-A 826 021. However, isotactic polystyrene crystallizes so slowly that it can be processed only unsatisfactorily by injection molding.
Processes for preparing syndiotactic polystyrene by reaction of styrene in the presence of a metallocene complex and a cocatalyst are described, for example, in EP-A 535 582 and EP-A 584 646. Syndiotactic polystyrene has a high chemical resistance, high stiffness, good dimensional stability and good dielectric properties. However, the processes described in the documents mentioned have the disadvantage that the catalysts are not immediately active.
It is an object of the present invention to provide a new process for preparing polymers of vinylaromatic compounds which does not display the disadvantages mentioned, which is, in particular, relatively uncomplicated technically and in which the catalysts are active immediately and can be readily separated from the polymer formed and which lead to syndiotactic polymers.
We have found that this object is achieved by a process for preparing polymers of vinylaromatic compounds at from 0 to 150.degree. C. in the presence of catalyst systems which comprise as active constituents formula II ##STR1## where R.sup.1 to R.sup.5 are hydrogen, C.sub.1 -C.sub.10 -alkyl, which may bear from 1 to 5 halogen substituents, 5- to 7-membered cycloalkyl which in turn may bear C.sub.1 -C.sub.6 -alkyl groups as substituents, C.sub.6 -C.sub.15 -aryl or arylalkyl, where, if desired, two adjacent radicals can together form a cyclic group having from 4 to 15 carbon atoms, or halogen, C.sub.1 -C.sub.10 -alkoxy, NR.sup.6 R.sup.7 or Si(R.sup.6).sub.3, -C.sub.10 -cycloalkyl, Elements, thereof ##STR2## where R.sup.8 is a C.sub.1 -C.sub.4 -alkyl group and m is an integer from 5 to 30, consisting of strong, uncharged Lewis acids, ionic compounds having a Lewis-acid cation and ionic compounds having a Bronsted acid as cation.
Furthermore, the present invention provides for the use of the polymers obtainable in this way for producing moldings.
Particularly useful vinylaromatic compounds are compounds of the formula V ##STR3## where the substituents have the following meanings: R.sup.9 is hydrogen or C.sub.1 -C.sub.4 -alkyl, -C.sub.12 -alkyl, C.sub.6 -C.sub.18 -aryl, halogen or two adjacent radicals together form a cyclic group having from 4 to 15 carbon atoms.
Preference is given to using vinylaromatic compounds of the formula V in which phenyl or two adjacent radicals together form a cyclic group having from 4 to 12 carbon atoms so that the resulting compounds of the formula V are, for example, naphthalene derivatives or anthracene derivatives.
Examples of such preferred compounds are: 4-vinylbiphenyl, 2-vinylnaphthalene or 9-vinylanthracene.
It is also possible to use mixtures of different vinylaromatic compounds, but preference is given to using only one vinylaromatic compound.
Particularly preferred vinylaromatic compounds are styrene and p-methylstyrene.
The preparation of vinylaromatic compounds of the formula V is known per se and described, for example, in Beilstein U.S. Pat. No. 5,367,474,485.
In the process of the present invention, the component A) comprises compounds of the formula I. Among these compounds I, preference is given to those in which X is C.sub.l -C.sub.4 -alkyl, in particular ethyl or ethyl, C.sub.1 -C.sub.4 -alkoxy or particularly preferably a compound of the formula II ##STR4##
Among the compounds of the formula II, preference is given to those in which R.sup.1 to R
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Beilstein, 5, pp. 367, 474, 485.
Maurice Morton, Amionic Polymerization, Principles and Practice, Academic Press, 1983 (copy is not available at this time).
Fischer David
Lux Martin
Wunsch Josef
BASF - Aktiengesellschaft
Teskin Fred
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