Manufacture of olefin polymers

Details Manufacture of olefin polymers Manufacture of olefin polymers

1978-04-28

1979-10-02

Holler, Alan

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252458, 252470, 526 97, 526 99, 526105, 526106, 526352, C08F 426, C08F 424, C08F 1000, C08F 1002

Patent

active

041699254

ABSTRACT:
A process for the manufacture of olefin polymers by polymerizing .alpha.-monoolefins at relatively low temperatures and relatively low olefin pressures by means of a catalyst obtained from a silicate carrier (component a), an aluminum compound (component b) and a chromium compound (component c). The catalyst is obtained by (1) in a first stage, initially (1.1) charging a particular silicate carrier (component a) with (1.2) a mixture of (1.2.1) an aluminum salt or a mixture of an aluminum salt with up to 80 mole%, based on the salt mixture, of a nickel-II salt (component b) and (1.2.2) a chromium compound (component c), this compound being chromium trioxide or a compound which is converted to chromium trioxide under the conditions of stage (2), by treatment with a solution of the mixture (1.2), and (2), in a second stage then maintaining the product, obtained from stage (1), for a certain time at a high temperature in an anhydrous oxygen-containing gas stream. The process may be used to produce polymers having a relatively broad molecular weight distribution.

REFERENCES:
patent: 3879362 (1975-04-01), Chalfont et al.
patent: 4037042 (1977-07-01), Mueller-Tamm et al.
patent: 4092468 (1978-05-01), Gruber et al.

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