Two 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 2 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 a substituted hydrocarbon group containing from 1 to 20 carbon atoms; x is 2-4; and R 2 is an aliphatic or aromatic hydrocarbon, or a substituted hydrocarbon group containing from 1 to 20 carbon atoms, provided that there are 2 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 each R 1 is an aliphatic hydrocarbon.
3. The catalyst component of claim 1 where each R 1 is an aromatic hydrocarbon.
4. The catalyst component of claim 1 where R 2 is a 1,2-substituted phenyl moiety.
5. The catalyst component of claim 1 where R 2 is a 1,2- or 3,4-substituted naphthyl moiety.
6. The catalyst component of claim 1 where R 2 is an straight or branched alkyl moiety, provided that there are 2 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.
7. The catalyst component of claim 4 where each R 1 is an aliphatic or aromatic hydrocarbon group.
8. The catalyst component of claim 4 where each R 1 is ethyl or phenyl.
9. The catalyst component of claim 1 where the internal electron donor comprises one of the following compounds: 5-tert-butyl-3-methyl-1,2-phenylene diethyl dicarbonate, 5-tert-butyl-3-methyl-1,2-phenylene diphenyl dicarbonate, or 3,5-diisopropyl-1,2-phenylene diethyl dicarbonate.
10. The catalyst component of claim 1 which is optionally combined with a single component SCA, a mixed component SCA, or an activity limiting agent.
11. The catalyst component of claim 10 where the mixed component SCA contains an activity limiting agent or an organic ester as a component.
12. The catalyst component of claim 11 which is optionally combined with an organoaluminum compound.
13. 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 2 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.
14. A method of polymerizing an olefin comprising contacting the olefin with a catalyst component of claim 2 .