Procatalyst composition including silyl ester internal donor and method
View Patent ↗The present disclosure provides silyl esters and silyl diol esters suitable as internal electron donors in procatalysts for polymer production. Disclosed are procatalyst compositions formed from a procatalyst precursor and an internal electron donor that is a silyl ester or a silyl diol ester. The procatalyst compositions can be used with a cocatalyst and optionally an external electron donor and/or an activity limiting agent to form a Ziegler-Nana catalyst composition. The present catalyst compositions exhibit high catalyst activity and form olefin-based polymers with broad molecular weight distribution, favorable flexural modulus, and high isotacticity.
1. A procatalyst composition comprising:
a combination of a magnesium moiety, a titanium moiety, and an internal electron donor, the internal electron donor comprising a silyl ester of the structure
wherein m is 1 denoting a hydrocarbyl with the same number of carbon atoms, n is 1 denoting a hydrocarbyl with same number of carbon atoms,
R 1 -R 7 are the same or different and each is selected from the group consisting of hydrogen, a substituted hydrocarbyl group having 1 to 20 carbon atoms, an unsubstituted hydrocarbyl group having 1 to 20 carbon atoms, and combinations thereof; and
X is an electron donating group.
2. The procatalyst composition of claim 1 wherein X is selected from the group consisting of —C(═O)OR, —O(O═)CR, —(O═)CNHR, —(O═)CNRR′, —NH(O═)CR, —NR′(O═)CR, —C(═O)R, —OR, —NHR, —NR′R, —SR, —OP(OR′)(OR), —OP(═O)(OR′)(OR), —S(═O)R, —S(═O) 2 R, —OS(═O) 2 (OR), and combinations thereof; and
R and R′ are the same or different and each of R and R′ is selected from the group consisting of a substituted hydrocarbyl group having 1 to 20 carbon atoms, an unsubstituted hydrocarbyl group having 1 to 20 carbon atoms, and combinations thereof.
3. The procatalyst composition of claim 1 comprising an internal electron donor of the structure
wherein R 1 -R 8 are the same or different and each is selected from the group consisting of hydrogen, a substituted hydrocarbyl group having 1 to 20 carbon atoms, an unsubstituted hydrocarbyl group having 1 to 20 carbon atoms, and combinations thereof.
4. The procatalyst composition of claim 1 comprising an internal electron donor of the structure
5. The procatalyst composition of claim 1 wherein R 3 -R 6 are hydrogen, R 1 and R 2 are the same or different and each is selected from the group consisting of hydrogen, a C 1 -C 6 alkyl group, and combinations thereof.
6. The procatalyst composition claim 1 wherein each of R 1 and R 2 is selected from the group consisting of methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, t-butyl, and combinations thereof.
7. The procatalyst composition of claim 1 wherein R 1 and R 2 are both methyl.
8. The procatalyst composition of claim 1 wherein R 1 is methyl and R 2 is ethyl.
9. The procatalyst composition of claim 1 wherein R 1 and R 2 are both ethyl.
10. The procatalyst composition of claim 1 wherein R 1 is methyl and R 2 is isobutyl.
11. The procatalyst composition of claim 1 wherein the silyl ester comprises bis(benzoyloxy)dimethylsilane.
12. The procatalyst composition of claim 1 wherein the silyl ester comprises bis(benzoyloxy)diethylsilane.
13. The procatalyst composition of claim 1 wherein the silyl ester comprises bis(benzoyloxy)ethylmethylsilane.
14. The procatalyst composition of claim 1 wherein the silyl ester comprises bis(benzoyloxy)isobutylmethylsilane.
15. A catalyst composition comprising:
a procatalyst composition of claim 1 ; and
a cocatalyst.
16. The catalyst composition of claim 15 comprising a member selected from the group consisting of an external electron donor, an activity limiting agent, and combinations thereof.