Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1997-03-21
1999-04-20
Bell, Mark L.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
502232, 502233, 502234, 502238, 502242, 502246, 502351, 502252, 502256, 502263, 502120, 502117, B01J 2108, B01J 2112, B01J 2114, C08F 402
Patent
active
058957707
ABSTRACT:
A transition metal containing catalyst having a silica-support is provided for the production of polyolefins from .alpha.-olefins that can be converted to polymer films, preferably thin films of polyolefin, which have lower defects resulting from a decreased presence of silica-containing residues from the catalyst. The catalyst has a porous silica support component and a catalytic component which may include, but is not limited to, such materials as chromium, magnesium-titanium (Ziegler-Natta type) or metallocene compounds (Metallocene catalyst type). The porous silica component of the catalyst has an average pore volume of from about 2.5 to about 3.5 ml/g and a surface area of 200 to 400 m.sup.2 /g and preferably 250 to 350 m.sup.2 /g. The average pore diameter ranges from about 285 to about 700 Angstroms and preferably 500-700 Angstroms for porous silica components having surface areas of 200 m.sup.2 /g and preferably 285-400 Angstroms for porous silica components having surface areas of 350 m.sup.2 /g. Preferably, the average particle size of the silica component may range from 44 to about 150 microns in diameter.
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(1) Max P. McDaniel, "Fracturing Silica-Based Catalysts During Ethylene Polymerization", J. Polymer Sci.: Polymer Chem. Ed., vol. 19, pp. 1967-1976.
(2) The PQ Corporation, "Silica Catalysts," Bulletin SC-101.
(3) The PQ Corporation, "PQ Polyolefin Catalysts," Bulletin SC-102.
Gillings Carl A.
Pullukat Thomas J.
Witt Reinhard H.
Bell Mark L.
Pasterczyk J.
PQ Corporation
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