Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1998-06-02
2000-04-11
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526144, 526160, 526117, C08F 444, C08F 470
Patent
active
060489510
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to processes for preparing copolymers of vinyl-aromatic compounds at -80-150.degree. C. in the presence of metallocene catalyst systems.
The present invention also relates to the use of the copolymers obtainable in such a process for producing fibers, films and moldings and to the fibers, films and moldings obtainable therefrom.
Copolymers of vinyl-aromatic compounds, especially styrene, have properties which make them useful in numerous areas, for example as packaging materials or insulation coatings for metals or plastics, especially in electrical applications.
EP-A 311 099 and EP-A 490 269 describe processes for preparing styrene copolymers using stirred vessels. A disadvantage of this is that the copolymers are awkward to handle.
It is an object of the present invention, therefore, to provide new processes for preparing copolymers of vinyl-aromatic compounds without such disadvantages and, in particular, in a technically less complex manner.
We have found that this object is achieved by processes for preparing copolymers of vinyl-aromatic compounds at -80 to 150.degree. C. in the presence of metallocene catalyst systems, in which polymerization is carried out using a corotating, closely intermeshing twin-screw extruder.
We have also found that the copolymers obtainable in such a process can be used to produce fibers, films and moldings and have found the fibers, films and moldings obtainable therefrom.
Particularly suitable vinyl-aromatic compounds are compounds of the formula I ##STR1## where R.sup.1 is hydrogen or C.sub.1 -C.sub.4 -alkyl, C.sub.6 -C.sub.18 -aryl or halogen or two adjacent radicals together are a C.sub.4 -C.sub.15 cyclic group.
Preference is given to the use of vinyl-aromatic compounds of the formula I, where or where two adjacent radicals together are a C.sub.4 -C.sub.12 cyclic group such that examples of compounds of the general formula I are naphthalene derivatives or anthracene derivatives.
Examples of such preferred compounds are styrene, p-methylstyrene, p-chlorostyrene, 2,4-dimethylstyrene, 4-vinylbiphenyl, 2-vinylnaphthalene or 9-vinylanthracene.
It is also possible to use mixtures of different vinyl-aromatic compounds but preferred to use only one.
Particularly preferred vinyl-aromatic compounds are styrene and p-methylstyrene.
The preparation of vinyl-aromatic compounds of the general formula I is known per se and is described, for example, in Beilstein 5, 367, 474, 485.
Comonomers used in the process according to the invention are preferably aromatic compounds having at least two unsaturated hydrocarbon radicals.
Suitable examples are compounds of the formula II ##STR2## where R.sup.7 is hydrogen or C.sub.1 -C.sub.4 -alkyl, C.sub.6 -C.sub.18 -aryl or halogen or an unsaturated C.sub.2 -C.sub.10 hydrocarbon radical, at least one of R.sup.8 -R.sup.12 being an unsaturated C.sub.2 -C.sub.10 hydrocarbon radical, or where two adjacent radicals together are a C.sub.4 -C.sub.15 cyclic group which may itself carry unsaturated C.sub.2 -C.sub.10 hydrocarbon radicals.
Preferred compounds of the formula II are those in which or an unsaturated C.sub.2 -C.sub.6 hydrocarbon radical, at least one of R.sup.8 -R.sup.12 being an unsaturated C.sub.2 -C.sub.6 hydrocarbon radical, or where two adjacent radicals together are a C.sub.4 -C.sub.12 cyclic group, such that examples of compounds of the general formula II are naphthalene derivatives or anthracene derivatives, said cyclic groups in turn possibly carrying unsaturated C.sub.2 -C.sub.6 hydrocarbon radicals.
Examples of such preferred compounds are p-divinylbenzene, m-divinylbenzene, trivinylbenzenes, allylstyrenes, methallylstyrenes, butenylstyrenes, pentenylstyrenes, divinylnaphthalenes and divinylanthracenes.
Thus examples of the unsaturated hydrocarbon radicals are vinyl, allyl, methallyl, butenyl or pentenyl, preferably vinyl.
It is also possible to use mixtures of different aromatic compounds having at least two unsaturated hydrocarbon radicals.
The preparation of such aromatic compounds having
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Billmeyer F, "Textbook of Polymer Science", 3-d edition, pp. 461-461, 1984.
Jrl. Org. Chem., 369 (1989) 359-370, Wiesenfeldt et al.
Beilsteins Handbuch der Organischem Chemie, 1922, 474, 485, 367.
Hofmann Jurgen
Kessler Thomas
Wunsch Josef
BASF - Aktiengesellschaft
Wu David W.
Zulukaeva Tanya
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