Title:
SILICA SUPPORTED TRANSITION METAL CATALYST
Document Type and Number:
WIPO Patent Application WO1993019105
Kind Code:
A3
Abstract:
A transition metal containing catalyst useful for the polymerization of alpha -olefins is prepared by (A) forming in an inert atmosphere which excludes oxygen and moisture a slurry of (1) a porous inorganic oxide support material selected from the group consisting of silica, alumina, or a combination of silica and alumina, said support material containing not greater than about 5 millimoles of hydroxyl groups per gram of support material and a particle size not greater than about 10 microns and a surface area of from about 50 to about 800 m2/g in an inert organic liquid medium; (B) mixing said slurry with (2) an alkoxide and stirring the resultant mixture at a temperature of from about -20 DEG C. to about 120 DEG C. for a time sufficient to saturate the surface of the support material; (C) mixing the product form (B) with (3) a titanium compound or a combination of a titanium compound and (4) a vanadium compound and stirring the resultant mixture at a temperature of from about -20 DEG C. to about 120 DEG C. for a time sufficient to allow complete reaction of the titanium compound and the vanadium compound with the organomagnesium moieties remaining on the solid support; (D) mixing the product from (C) with an inert organic solution of (5) a Group IIIA metal alkyl halide at a temperature of from about -20 DEG C. to about 120 DEG C. for a time sufficient to complete the reduction of the titanium and vanadium, if present, compounds to their final oxidation state. Ethylene/alpha-olefin copolymers which have greater than 17 percent high density fraction and a Mw/Mn ratio of less than about 3.6 are shown to be useful in making cast films which have good stretchability and good puncture resistance. Copolymers of the present invention having the specified properties are especially useful in making the films.
Inventors:
SPENCER LEE (US)
KOLTHAMMER BRIAN W S (US)
RIPPLINGER MIRIAM P (US)
WOOSTER JEFFREY J (US)
CHUM PAK-WING STEVE (US)
DEGROOT JACQUELYN ANN (US)
KOLTHAMMER BRIAN W S (US)
RIPPLINGER MIRIAM P (US)
WOOSTER JEFFREY J (US)
CHUM PAK-WING STEVE (US)
DEGROOT JACQUELYN ANN (US)
Application Number:
PCT/US1993/002751
Publication Date:
November 11, 1993
Filing Date:
March 17, 1993
Export Citation:
Assignee:
DOW CHEMICAL CO (US)
International Classes:
B29C55/02; C08J5/18; C08F4/646; C08F4/658; C08F4/685; C08F10/00; C08F210/00; C08F210/02; C08F210/16; B29K23/00; B29L7/00; (IPC1-7): C08F10/00; C08F4/655
Domestic Patent References:
| WO1992013009A1 | 1992-08-06 |
Foreign References:
| EP0435627A2 | 1991-07-03 | |||
| GB2189252A | 1987-10-21 | |||
| US4558024A | 1985-12-10 | |||
| EP0324588A2 | 1989-07-19 | |||
| US4243619A | 1981-01-06 | |||
| EP0100689A1 | 1984-02-15 |
Other References:
JOURNAL OF PLASTIC FILM & SHEETING vol. 4, July 1988, DOHRER K.K. 'Short Chain Branching Distribution of ULDPE' cited in the application
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