Impregnated polymerization catalyst, process for preparing, and use for ethylene copolymerization
First Claim
1. A continuous catalytic process for producing ethylene copolymer with a Ti containing catalyst at a productivity of ≧
- 50,000 pounds of polymer per pound of Ti in a fluid bed reactor under a pressure of <
1000 psi in the gas phasesaid polymer being produced in granular form and having a density of ≧
0.91 to ≦
0.94 and a melt flow ratio of ≧
22 to ≦
32which comprises polymerizing ethylene with at least one C3 to C8 alpha olefin at a temperature of about 30°
to 105°
C. by contacting the monomer charge with, in the presence of about 0 to 2.0 mols of hydrogen per mol of ethylene in the gas phase reaction zone, particles of a catalyst composition comprising a precursor composition of the formula
space="preserve" listing-type="equation">Mg.sub.m Ti.sub.1 (OR).sub.n X.sub.p [ED]qwherein R is a C1 to C14 aliphatic or aromatic hydrocarbon radical, or COR'"'"' wherein R'"'"' is a C1 to C14 aliphatic or aromatic hydrocarbon radical,X is selected from the group consisting of Cl, Br, I or mixtures thereof,ED is an electron donor compound,m is ≧
0.5 to ≦
56,n is 0, 1 or 2,p is ≧
2 to ≦
116, andq is ≧
2 to ≦
85,said precursor composition being impregnated in a porous support and beingfirst partially activated outside of said reactor in a hydrogen slurry with >
0 to ≦
10 mols of activator compound per mol of Ti in said precursor composition, andthen completely activated in said reactor with >
10 to ≦
400 mols of activator compound per mol of Ti in said precursor composition in the absence of a solvent so as to avoid the need for drying the fully active catalyst to remove solvent therefrom,said activator compound having the formula
space="preserve" listing-type="equation">Al(R").sub.c X'"'"'.sub.d H.sub.ewherein X'"'"' is Cl or OR"'"'"', R" and R"'"'"' are the same or different, and are C1 to C14 saturated hydrocarbon radicals, d is 0 to 1.5, e is 1 or 0 and c+d+e=3,said electron donor compound being a liquid organic compound in which said precursor composition is soluble and which is selected from the group consisting of alkyl esters of aliphatic and aromatic carboxylic acids, aliphatic esters, cyclic ethers and aliphatic ketones.
3 Assignments
0 Petitions
Accused Products
Abstract
A catalyst formed from selected organo aluminum compounds and a precursor composition of the formula
Mg.sub.m Ti.sub.l (OR).sub.n X.sub.p [ED].sub.q
wherein ED is a selected electron donor compound
m is ≧0.5 to ≦56
n is 0, 1 or 2
p is ≦2 to ≧116
q is ≧2 to ≦85
R is a C1 to C14 aliphatic or aromatic hydrocarbon radical, or COR'"'"' wherein R'"'"' is a C1 to C14 aliphatic or aromatic hydrocarbon radical, and
X is selected from the group consisting of Cl, Br, I or mixtures thereof,
which catalyst is in particulate form and impregnated in a porous inert carrier material.
A process for preparing such catalyst.
A process for using said catalyst to readily prepare ethylene copolymers having a density of about ≧0.91 to ≦0.94 and a melt flow ratio of ≧22 to ≦32 in a low pressure gas phase process at a productivity of ≧50,000 pounds of polymer per pound of Ti.
Novel polymers and molded articles are prepared.
-
Citations
6 Claims
-
1. A continuous catalytic process for producing ethylene copolymer with a Ti containing catalyst at a productivity of ≧
- 50,000 pounds of polymer per pound of Ti in a fluid bed reactor under a pressure of <
1000 psi in the gas phasesaid polymer being produced in granular form and having a density of ≧
0.91 to ≦
0.94 and a melt flow ratio of ≧
22 to ≦
32which comprises polymerizing ethylene with at least one C3 to C8 alpha olefin at a temperature of about 30°
to 105°
C. by contacting the monomer charge with, in the presence of about 0 to 2.0 mols of hydrogen per mol of ethylene in the gas phase reaction zone, particles of a catalyst composition comprising a precursor composition of the formula
space="preserve" listing-type="equation">Mg.sub.m Ti.sub.1 (OR).sub.n X.sub.p [ED]qwherein R is a C1 to C14 aliphatic or aromatic hydrocarbon radical, or COR'"'"' wherein R'"'"' is a C1 to C14 aliphatic or aromatic hydrocarbon radical, X is selected from the group consisting of Cl, Br, I or mixtures thereof, ED is an electron donor compound, m is ≧
0.5 to ≦
56,n is 0, 1 or 2, p is ≧
2 to ≦
116, andq is ≧
2 to ≦
85,said precursor composition being impregnated in a porous support and being first partially activated outside of said reactor in a hydrogen slurry with >
0 to ≦
10 mols of activator compound per mol of Ti in said precursor composition, andthen completely activated in said reactor with >
10 to ≦
400 mols of activator compound per mol of Ti in said precursor composition in the absence of a solvent so as to avoid the need for drying the fully active catalyst to remove solvent therefrom,said activator compound having the formula
space="preserve" listing-type="equation">Al(R").sub.c X'"'"'.sub.d H.sub.ewherein X'"'"' is Cl or OR"'"'"', R" and R"'"'"' are the same or different, and are C1 to C14 saturated hydrocarbon radicals, d is 0 to 1.5, e is 1 or 0 and c+d+e=3, said electron donor compound being a liquid organic compound in which said precursor composition is soluble and which is selected from the group consisting of alkyl esters of aliphatic and aromatic carboxylic acids, aliphatic esters, cyclic ethers and aliphatic ketones. - View Dependent Claims (2, 3, 4, 5, 6)
- 50,000 pounds of polymer per pound of Ti in a fluid bed reactor under a pressure of <
Specification