Olefin polymerization with polyphosphate supported chromium cata

Details Olefin polymerization with polyphosphate supported chromium cata Olefin polymerization with polyphosphate supported chromium cata

1985-06-05

1987-02-03

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526105, 526106, 526138, 526145, 526154, 526156, C08F 424, C08F 478

Patent

active

046409645

ABSTRACT:
A catalyst support based on aluminum polyphosphate or polyphosphoric acid-impregnated alumina is provided by two alternative techniques. In the first embodiment, an aluminum polyphosphate composition is heated in a dry atmosphere and thereafter impregnated with a zerovalent chromium component under anhydrous conditions. The resulting catalyst is active for olefin polymerization. In the second embodiment, alumina is impregnated with a polyphosphoric acid composition. This resulting polyphosphoric acid impregnated alumina can be used as a support for zerovalent chromium or can be impregnated with a chromium component and oxidized to give an active hexavalent chromium species. The resulting catalysts are advantageous because of their unusual sensitivity to hydrogen thus allowing great leeway in molecular weight control.

REFERENCES:
patent: 2773921 (1956-12-01), Rylander, Jr. et al.
patent: 2921081 (1960-01-01), Zimmerschied et al.
patent: 4147758 (1979-04-01), Adrian et al.
patent: 4364841 (1982-12-01), McDaniel et al.
patent: 4364842 (1982-12-01), McDaniel et al.
patent: 4397765 (1983-08-01), McDaniel

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