Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-09-21
2000-07-25
Woodward, Ana
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525905, C08L 7700
Patent
active
060937718
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to thermoplastic molding compositions comprising structure, number VN in the range from 50 to 150 ml/g and
The present invention further relates to the use of the thermoplastic molding compositions for producing fibers, films and moldings, and also to the fibers, films and moldings obtainable therefrom.
EP-A 314 146 has disclosed formulations which are composed of syndiotactic polystyrene (s-PS) and polyphenylene ethers (PPE). The polymer systems obtained here have more than one phase, and, although their heat resistance is good, they are very brittle and have unsatisfactory flowability.
EP-A 546 497 describes a formulation of s-PS, inorganic fillers and modified PPE. However, the material here is likewise brittle.
It is an object of the present invention to set aside the disadvantages mentioned and to provide thermoplastic molding compositions which have improved flowability, reduced water absorption, better dimensional stability and improved hydrolysis resistance.
We have found that this object is achieved by means of the thermoplastic molding compositions defined at the outset.
The use of the thermoplastic molding compositions for producing fibers, films and moldings has moreover been found, as have the fibers, films and moldings obtainable therefrom.
The novel thermoplastic molding compositions comprise, as component A), from 5 to 97.9% by weight, preferably from 15 to 89.8% by weight, in particular from 30 to 79.5% by weight, of a vinylaromatic polymer with syndiotactic structure. The term "with syndiotactic structure" here means that the polymers are essentially syndiotactic, i.e. the syndiotactic fraction determined by .sup.13 C-NMR is greater than 50%, preferably greater than 60%.
Component A) is preferably built up of compounds of the formula I ##STR1## where: R.sup.1 is hydrogen or C.sub.1 -C.sub.4 -alkyl, -C.sub.12 -alkyl, C.sub.6 -C.sub.18 -aryl, or halogen, or where two adjacent radicals jointly are a cyclic group having from 4 to 15 carbon atoms.
Use is preferably made of vinylaromatic compounds of the formula I where
R.sup.1 is hydrogen biphenyl, naphthalene or anthracene, or where two adjacent radicals jointly are a cyclic group having from 4 to 12 carbon atoms, so that the resulting compound of the formula I is, for example, a naphthalene derivative or an anthracene derivative.
Examples of such preferred compounds are: m,p-divinylbenzene, 4-vinylbiphenyl, vinylnaphthalene and vinylanthracene.
It is also possible to use mixtures of different vinylaromatic compounds, but it is preferable to use only one vinylaromatic compound.
Particularly preferred vinylaromatic compounds are styrene, p-methylstyrene and m,p-divinylbenzene.
Component A) may also be a mixture of different vinylaromatic polymers with syndiotactic structure, but it is preferable to use only one vinylaromatic polymer, in particular s-PS.
vinylaromatic polymers with syndiotactic structure, and also processes for their preparation, are known per se and are described, for example, in EP-A 535 582. They are preferably prepared by reacting compounds of the general formula I in the presence of a metallocene complex and a cocatalyst. Metallocene complexes used in particular are pentamethylpentacyclodienyltitanium trichloride, pentamethylcyclopentadienyltrimethyltitanium, and pentamethylcyclopentadienyltitanium trimethylate.
The vinylaromatic polymers with syndiotactic structure generally have a molecular weight M.sub.w (weight average) of from 5000 to 10,000,000, in particular from 10,000 to 2,000,000. The molecular weight distribution M.sub.w /M.sub.n (M.sub.n =number average) are generally in the range from 1.1 to 30, preferably from 1.4 to 10.
The thermoplastic molding compositions comprise, as component B), from 2 to 90% by weight, preferably from 10 to 80% by weight, in particular from 20 to 65% by weight, of a low-viscosity polyamide with a viscosity number VN in the range from 50 to 150 ml/g, preferably from 60 to 150 ml/g, in particular from 70 to 150 ml/g.
The viscosity number VN is determined in
REFERENCES:
Polymer-Polymer Miscibility, Olabisi, 224-245 1979.
JP Abst. 06345923 Dec. 20, 1994.
JP Abst. 08143729 Jun. 4, 1996.
JP Abst. 07048488 Feb. 21, 1995.
JP Abst. 07048487 Feb. 21, 1995.
Gluck Alexander
Grutke Stefan
Heitz Thomas
Pipper Gunter
Vogel Wilfried
BASF - Aktiengesellschaft
Woodward Ana
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