Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1977-12-05
1979-04-24
Dees, Carl
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252452, B01J 2900, B01J 3702
Patent
active
041511220
ABSTRACT:
High melt flow olefin polymers suitable for such applications as injection molding, and the like requiring a narrow molecular weight distribution are produced using a catalyst made by reducing and reoxidizing a chromium catalyst on either a titanium-silica cogel or a self-reduced silica-containing composition. In the first embodiment, a cogel formed by coprecipitating silica and titania, and containing a chromium compound, is treated in a nonoxidizing atmosphere, such as CO, hydrogen, N.sub.2 or a material decomposable to these materials, and thereafter reoxidized. In the second embodiment, a titanium-free chromium containing catalyst is first heated in air or the like to dry the catalyst and oxidize the chromium after which it is heated in an inert atmosphere wherein the composition is self-reduced to give chromium in a lower valence state. The resulting self-reduced composition is then heated in a reducing ambient and then reoxidized as in the first embodiment.
REFERENCES:
patent: 2783134 (1957-02-01), Hughes et al.
patent: 3412040 (1968-11-01), Saccardo et al.
patent: 3446754 (1969-05-01), Solvik et al.
patent: 3887494 (1975-06-01), Dietz
patent: 4053436 (1977-10-01), Hogan et al.
McDaniel Max P.
Welch Melvin B.
Dees Carl
Phillips Petroleum Company
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