DETAILED DESCRIPTION OF THE INVENTION The present invention will now be illustrated in order and in detail.
I.
Catalyst component and treating agent (1) Magnesium halide The magnesium halide, in particular, anhydrous magnesium dihalide used in the present invention includes MgCL.
sub.
2, MgBr.
sub.
2 and MgI.
sub.
2.
MgCl.
sub.
2 is preferably employed.
These anhydrous magnesium dihalides can be those synthesized by any methods and commercially sold compounds can be used.
The magnesium dihalide should be substantially anhydrous, the presence of water being allowed to such an extent that the catalytic performance is not affected.
Usually, the commercially sold anhydrous magnesium dihalide, prior to use, is subjected to a dehydration treatment in conventional manner, for example, by calcining at a temperature of 100.
degree.
C.
to 400.
degree.
C.
under reduced pressure for 1 to 10 hours.
(2) Titanium (IV) halide Typical examples of tetravalent titanium halide used in the present invention are TiCl.
sub.
4, TiBr.
sub.
4 and TiI.
sub.
4.
However, it is not always necessary that all the anions be halogens, a part thereof can be substituted by alkoxy, acyloxy or alkyl groups.
Preferably TiCl.
sub.
4 is employed in accordance with the present invention.
(3) Electron donative compound (Lewis base) Examples of the electron donative compound used in the present invention are organic carboxylic acids, organic carboxylic acid esters, alcohols, ethers, ketones, amines, amides, nitriles, aldehydes, alcoholate, phosphorus, arsenic and antimony compounds combined with organic groups through carbon or oxygen, phosphoamides, thioethers, thioesters and carbonic acid esters.
In particular, organic acid esters are preferably used.
The organic acid esters are esters formed by condensation of saturated or unsaturated aliphatic, alicyclic and aromatic mono- or polycarboxylic acids and aliphatic, alicyclic and araliphatic mono- or polyols.
Illustrative examples of these esters are butyl formate, ethyl acetate, butyl acetate, ethyl acrylate, ethyl butyrate, isobutyl isobutyrate, methyl methacrylate, diethyl maleate, diethyl tartrate, ethyl hexahydrobenzoate, ethyl benzoate, ethyl p-methoxybenzoate, methyl p-methylbenzoate, ethyl p-tert-butylbenzoate, dibutyl phthalate, diallkyl phthalate and ethyl
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Heat Accumulators 
