DE1007999B - Process for the production of solid ethylene polymers - Google Patents

Description

Process for the production of solid ethylene polymers The production of oily polymers of ethylene by reacting ethylene with anhydrous Aluminum chloride as a catalyst has already been described variously in the literature wound. Also the formation of mixtures of solid and oily Ethyl.enpalymerisaten with the help of aluminum chloride activated with titanium tetrachloride is already known. Here, ethylene is combined with the catalyst under pressure and at elevated temperature, z. B. under 58 atmospheres and at 135 ° implemented.

It has now been found that ethylene reacts with aluminum chloride alone pressureless in the presence of low-boiling organic solvents or diluents or under moderate pressures at temperatures below the boiling point of the Solvent or diluent can be converted into solid polymers, without the formation of oily by-products.

The reaction is carried out in such a way that one finely powdered anhydrous aluminum chloride in the low-boiling solvents or thinners, which are optionally under moderately increased pressure, z. B. in butane, pentane, hexene, Petroleum ether, methylene chloride or carbon tetrachloride, suspended and through this suspension a finely divided Äthylenstram at temperatures between about -30 and + 30 °. A tough, brown mass slowly develops. The A1 Cl contained in it becomes part of the decanting, the liquid phase Ice decomposes. By extracting the residue with solvents such as ether, and Upon evaporation of the solvent, a solid, snow-white polyethylene becomes obtained from the softening point 128 to 130 °.

His molecular weight depends on the temperature used. at At low temperatures you get higher molecular weights, at higher temperatures on the other hand, lower molecular weights. The molecular weight can be within wide limits to be changed.

The less hocbmodekula, ren paläthylenes are as exchange products Can be used for waxes and products with higher molecular weights a: ls plastics.

The parts mentioned in the examples are parts by weight.

Example 1 10 parts of finely powdered, commercially available aluminum chloride are suspended with 200 parts of petroleum ether in a 2 m high tube. Man directs now for several hours through a glass frit attached to the bottom of the tube a finely divided ethyl stream. About 28% of the ethylene is converted. To, The liquid phase is decanted after the solid constituents have settled; the semi-solid The residue is decomposed with ice and exhaustively extracted with ether. After evaporation of the ether, the polyethylene formed is obtained as a snow-white residue from the softening point 128 °.

The decanted solvent can be used for a new batch will.

For comparison, 10 parts of finely powdered, commercially available aluminum chloride are used suspended in 200 parts of ethylene chloride in a 2 m high tube. On this leads one 3 hours of ethylene at room temperature. The aluminum chloride goes here completely in solution. The reaction product is then treated with ice. After distilling off the ethylene chloride, only a thin liquid, brown colored C51 as residue.

Example 2 10 parts of finely powdered, commercially available aluminum chloride are suspended in 150 parts of methylene chloride. Ethylene according to Example 1 is reacted in this suspension at 20.degree. Solid polyethylene with an expansion point of 125 'is obtained in a yield of 40%.

Claims (1)

PATENT CLAIM: A process for the preparation of solid ethylene polymers in organic solvents with the aid of Alurniniumehlozid as a catalyst, characterized in that in the presence of organic solvents or diluents with boiling points up to 77 ° at temperatures below the boiling point of the solvent or diluent, optionally under moderate Pressure being polymerized. References considered: U.S. Patent No. 2183154.