Claims
- 1. A supported polymerization catalyst component obtained by the steps of:
- (a) contacting talc with an organomagnesium compound or complex in an amount such that the weight ratio of talc to magnesium is from about 1000:1 to about 5:1, wherein said organomagnesium compound or complex has one of the following formulas:
- R.sub.2.sup.1 Mg or (R.sub.2 Mg)nAlR.sub.3
- where R and R.sup.1 are each independently alkyl or alkoxide containing from about 1 to about 12 carbon atoms, cyclopentadienyl or aryl, and n is 0.5-10;
- (b) contacting the product produced in step (a) with an alcohol; and
- (c) contacting the product produced in step (b) with at least one transition metal-containing compound and/or a metallocene effective in ethylene polymerization reactions.
- 2. The catalyst component of claim 1 wherein the talc is pretreated by heating said talc to a temperature of at least about 150.degree. C.
- 3. The catalyst component of claim 1 wherein the transition metal compound(s) has the structural formula(s) M'(OR.sup.3).sub.x (O).sub.y (X.sup.4).sub.z and/or M(OR.sup.2).sub.q X.sub.p.sup.3 wherein M' is a metal of Group VB of the Periodic Table of Elements, X.sup.4 is a halogen; R.sup.3 is a hydrocarbyl having from about 1 to about 18 carbon atoms; x is 0 or an integer from 1 to 5; y is 0 or an integer from 1 to 3; z is 5-x-2y; M is a metal of Group IVB; R.sup.2 is an aryl, alkyl, aralkyl, cycloalkyl or alkylsilyl; X.sup.3 is a halogen; and p and q range from 0 to 4 with the proviso that sum of p and q is 3 or 4.
- 4. The catalyst component of claim 3, wherein the transition metal compound has the formula M(OR.sup.2).sub.q X.sub.p.sup.3 wherein M is titanium; p is an integer from 2 to 4; q is 0 or an integer from 1 to 2; and X.sup.3 is chloride.
- 5. The catalyst component of claim 4 wherein p is 4 and q is 0.
- 6. The catalyst component of claim 1 wherein the metallocene has one of the following formulas
- (Cp).sub.a M"R.sup.b.sup.4 X.sub.c.sup.5
- wherein Cp is cyclopentadienyl, indenyl or fluorenyl ring; M" is a Group IVB or VB transition metal; R.sup.4 is a hydride or a hydrocarbyl group having from about 1 to about 20 carbon atoms; X.sup.5 is a halogen atom; a is an integer of 1 to 3; b is 0 or an integer of 1 to 3; c is 0 or an integer of 1 to 3 with the proviso that the sum of a, b and c is equal to the oxidation state of M"
- (C.sub.5 R.sub.k.sup.5).sub.g R.sub.f.sup.6 (C.sub.5 R.sub.k.sup.5)M"Q.sub.3-g or
- R.sub.f.sup.6 (C.sub.5 R.sub.k.sup.5).sub.2 M"Q'
- wherein (C.sub.5 R.sub.k.sup.5) is a substituted or unsubstituted cyclopentadienyl, indenyl or fluorenyl; each R.sup.5 is the same or different and is hydrogen or alkyl, alkenyl, aryl, alkaryl, or aralkyl containing from about 1 to about 20 carbon atoms or are joined together to form a C.sub.4 -C.sub.6 ring; R.sup.6 is a C.sub.1 -C.sub.4 alkylene radical, a dialkyl germanium, a dialkyl silicon, an alkyl phosphine or an amine radical bridging two (C.sub.5 R.sub.k.sup.5) rings; Q is the same or different and is aryl, alkyl, alkenyl, alkaryl, or aralkyl having from 1-20 carbon atoms, a hydrocarboxy radical having from 1-20 carbon atoms or halogen; Q' is an alkylidiene radical having from 1 to about 20 carbon atoms; f is 0 or 1; g is 0, 1 or 2; with the proviso that f is 0 when g is 0, k is 4 when f is 1, and k is 5 when f is 0, and M" has the meaning given above.
- 7. The catalyst component of claim 6 wherein the metallocene is Zr(Cp).sub.2 Cl.sub.2.
- 8. The catalyst component of claim 1 wherein said alcohol is n-butanol.
- 9. The catalyst component of claim 1 wherein the weight ratio of talc to magnesium in the organomagnesium component is about 500:1.
- 10. An alpha-olefin catalyst system comprising the catalyst component of claim 1 and at least one aluminum-containing cocatalyst compound.
- 11. The catalyst system of claim 10 wherein the aluminum-containing cocatalyst is selected from the group consisting of a trialkyl aluminum, an alkyl aluminum halide, an aluminoxane and mixtures thereof.
- 12. The catalyst system of claim 11 wherein the aluminum-containing cocatalyst is an aluminoxane.
- 13. The catalyst system of claim 10 wherein the aluminoxane is methylaluminoxane.
- 14. A process for polymerizing ethylene or copolymerizing ethylene with another alpha-olefin into polymers having a narrow particle size distribution and having enhanced crystallization rates comprising (a) polymerizing ethylene alone or with another alpha-olefin under ethylene polymerization conditions in the presence of a supported polymerization catalyst component and an aluminum-containing cocatalyst component wherein said supported polymerization catalyst component is obtained by the steps of:
- (a) contacting talc with an organomagnesium compound or complex in an amount such that the weight ratio of talc to magnesium is from about 1000:1 to about 5:1, wherein said organomagnesium compound or complex has one of the following formulas:
- R.sub.2.sup.1 Mg or (R.sub.2 Mg)nAlR.sub.3
- where R and R.sup.1 are each independently alkyl or alkoxide containing from about 1 to about 12 carbon atoms, cyclopentadienyl or aryl, and n is 0.5-10;
- (b) contacting the product produced in step (a) with an alcohol; and
- (c) contacting the product produced in step (b) with at least one transition metal-containing compound and/or a metallocene effective in said ethylene polymerization reaction.
- 15. The process of claim 14 wherein the aluminum-containing cocatalyst is selected from the group consisting of a trialkyl aluminum, an alkyl aluminum halide, an aluminoxane and mixtures thereof.
- 16. The process of claim 15 wherein the aluminum-containing cocatalyst is an aluminoxane.
- 17. The process of claim 16 wherein the aluminoxane is methylaluminoxane.
- 18. The process of claim 14 wherein the polymerization of ethylene is conducted at a temperature from about 60.degree. C. to about 100.degree. C.
- 19. The process of claim 14 wherein the weight ratio of talc to magnesium in the organomagnesium component is about 500:1.
- 20. A supported polymerization catalyst component obtained by the steps of:
- (a) contacting talc with an organomagnesium compound or complex in an amount such that the weight ratio of talc to magnesium is from about 1000:1 to about 5:1, wherein said organomagnesium compound or complex has one of the following formulas:
- R.sub.2.sup.1 Mg or (R.sub.2 Mg).multidot.nAlR.sub.3
- where R and R.sup.1 are each independently alkyl or alkoxide containing from 1 to about 12 carbon atoms, cyclopentadienyl or aryl, and n is 0.5-10;
- (b) contacting the product produced in step (a) with an alcohol;
- (c) drying the product produced by step (b) under conditions to provide a surface coverage of magnesium values of from 1 to about 3 layers; and
- (d) contacting the product produced in step (c) with at least one transition metal-containing compound and/or a metallocene effective in ethylene polymerization reactions.
- 21. The supported polymerization component of claim 20 wherein said drying is conducted under a nitrogen atmosphere.
- 22. A process for polymerizing ethylene or copolymerizing ethylene with another alpha-olefin, said polymer having a narrow particle size distribution and enhanced crystallization rates comprising (a) homopolymerizing ethylene or copolymerizing ethylene with another alpha-olefin, under ethylene polymerization conditions, in the presence of a supported polymerization catalyst component and an aluminum-containing cocatalyst component, wherein said supported polymerization catalyst component is obtained by the steps of:
- (a) contacting talc with an organomagnesium compound or complex in an amount such that the weight ratio of talc to magnesium is from about 1000:1 to about 5:1, wherein said organomagnesium compound or complex has one of the following formulas:
- R.sub.2.sup.1 Mg or (R.sub.2 Mg).multidot.nAlR.sub.3
- where R and R.sup.1 are each independently alkyl or alkoxide containing from about 1 to about 12 carbon atoms, cyclopentadienyl or aryl, and n is 0.5-10;
- (b) contacting the product produced in step (a) with an alcohol;
- (c) drying the product produced by step (b) under conditions to provide a surface coverage of magnesium values of from 1 to about 3 layers; and
- (d) contacting the product produced in step (c) with at least one transition metal-containing compound and/or a metallocene effective in said ethylene polymerization reaction.
Parent Case Info
This application is a continuation, of application Ser. No. 08/519,034 filed Aug. 24, 1995 , now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (1)
Number |
Date |
Country |
63-256603 |
Oct 1988 |
JPX |
Non-Patent Literature Citations (2)
Entry |
H. Sinn et al. Adv. Organomet. Chem. 18, 99, 140-141 148-149 (1980). |
Hawley's Condensed Chemical Dictionary, 11th Ed. Van Nostrand Reinhold, New York, 1987, p. 1117. |
Continuations (1)
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Number |
Date |
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Parent |
519034 |
Aug 1995 |
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