Three and four atom bridged dicarbonate compounds as internal donors in catalysts for polypropylene manufacture
View Patent ↗A solid, hydrocarbon-insoluble, catalyst component useful in polymerizing olefins, said catalyst component containing magnesium, titanium, and halogen, and further containing an internal electron donor having a structure: [R 1 —O—C(O)—O—] x R 2 wherein R 1 is independently at each occurrence, an aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 1 to 20 carbon atoms; x is 2-4; and R 2 is an aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 1 to 20 carbon atoms, provided that there are from 3 to 4 atoms in the shortest chain connecting a first R 1 —O—C(O)—O— group and a second R 1 —O—C(O)—O— group.
1. A solid, hydrocarbon-insoluble catalyst component useful in polymerizing olefins, said catalyst component containing magnesium, titanium, and halogen, and further containing an internal electron donor having a structure:
[R 1 —O—C(O)—O—] x R 2
wherein R 1 is independently at each occurrence, an aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 1 to 20 carbon atoms; x is 2-4; and R 2 is an aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 1 to 20 carbon atoms, provided that there are from 3 to 4 atoms in the shortest chain connecting a first R 1 —O—C(O)—O— group and a second R 1 —O—C(O)—O— group.
2. The catalyst component of claim 1 where x=2.
3. The catalyst component of claim 1 where each R 1 is an aliphatic hydrocarbon.
4. The catalyst component of claim 1 where each R 1 is an aromatic hydrocarbon.
5. The catalyst component of claim 1 where R 2 is a 1,8-disubstituted naphthylene moiety.
6. The catalyst component of claim 1 where R 2 is a 2,2′-disubstituted biphenyl moiety.
7. The catalyst component of claim 1 where R 2 is a straight or branched alkyl moiety, provided that there are from 3 to 4 atoms in the shortest chain connecting a first R 1 —O—C(O)—O— group and a second R 1 —O—C(O)—O— group.
8. The catalyst component of claims 5 where each R 1 is an aliphatic hydrocarbon.
9. The catalyst component of claims 5 where each R 1 is methyl, ethyl, propyl, butyl, or isobutyl.
10. The catalyst component of claim 1 where the internal electron donor comprises one of the following compounds: dimethyl naphthalene-1,8-diyl dicarbonate; diethyl naphthalene-1,8-diyl dicarbonate; dipropyl naphthalene-1,8-diyl dicarbonate; dibutyl naphthalene-1,8-diyl dicarbonate; diisobutyl naphthalene-1,8-diyl dicarbonate; or biphenyl-2,2′-diyl diethyl dicarbonate.
11. The catalyst component of claim 1 where the internal electron donor comprises one of the following compounds: diethyl naphthalene-1,8-diyl dicarbonate; dipropyl naphthalene-1,8-diyl dicarbonate; or dibutyl naphthalene-1,8-diyl dicarbonate.
12. The catalyst component of claim 1 which is optionally combined with a single component SCA, a mixed component SCA, or an activity limiting agent.
13. The catalyst component of claim 12 where the mixed component SCA contains an activity limiting agent or an organic ester as a component.
14. The catalyst component of claim 13 which is optionally combined with an organoaluminum compound.
15. A method of polymerizing an olefin comprising contacting the olefin with a catalyst component containing magnesium, titanium, and halogen, and further containing an internal electron donor having a structure:
[R 1 —O—C(O)—O—] x R 2
wherein R 1 is independently at each occurrence, an aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 1 to 20 carbon atoms; x is 2-4; and R 2 is an aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 1 to 20 carbon atoms, provided that there are from 3 to 4 atoms in the shortest chain connecting a first R 1 —O—C(O)—O— group and a second R 1 —O—C(O)—O— group.
16. A method of polymerizing an olefin comprising contacting the olefin with a catalyst component of claim 2 .
17. A compound for use as an internal electron donor having a structure selected from the group consisting of:
wherein R 1 is independently at each occurrence, an aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 3 to 20 carbon atoms; R 2 is H or a C 1 -C 20 hydrocarbon; and R 3 is a C 1 -C 20 aliphatic hydrocarbon group.
18. The compounds of claim 17 wherein at least one R 1 group is an unbranched carbon chain.