Polyolefin gas phase polymerization with 3-substituted C4-10-alkene
View Patent ↗An alkene interpolymer is prepared by polymerizing at least one 3-substituted C 4-10 alkene and at least one C 2-8 alkene in a gas phase polymerization using a polymerization catalyst system.
1. A process for the preparation of an alkene interpolymer, comprising:
copolymerizing at least one 3-substituted C 4-10 alk-1-ene of formula (I) and at least one C 2-8 alkene;
wherein R 1 is a substituted or unsubstituted, C 1-6 alkyl group and n is an integer between 0 and 6,
and wherein
the copolymerization is conducted in a gas phase in the presence of a particulate catalyst system, which comprises a chromium oxide catalyst and
a content of catalyst system residues in the obtained interpolymer is less than 1200 ppm.
2. The process as claimed in claim 1 , wherein the C 2-8 alkene is ethylene or propylene.
3. The process as claimed in claim 1 ,
wherein R 1 is a unsubstituted, C 1-6 alkyl group and n is an integer between 0 and 6.
4. The process as claimed in claim 1 , wherein the 3-substituted C 4-10 alk-1-ene of formula (I) is 3-methyl-1-butene.
5. The process as claimed in claim 1 , wherein the process is continuous.
6. The process as claimed in claim 1 , wherein a total productivity of the catalyst system is at least 1000 g polymer per g solid catalyst.
7. The process as claimed in claim 1 , wherein the alkene interpolymer comprises 3-substituted C 4-10 alk-1-ene of formula (I) comonomer in an amount of 0.01-40 wt % based on a total weight of the interpolymer.
8. The process as claimed in claim 1 , wherein the alkene interpolymer comprises C 2-8 alkene monomer in an amount of at least 60 wt % based on the total weight of the interpolymer.
9. The process as claimed in claim 1 , wherein the alkene interpolymer comprises two C 2-8 alkene monomers and at least one 3-substituted C 4-10 alk-1-ene of formula (I) monomer.
10. The process as claimed in claim 1 , wherein a MFR 21 of the alkene interpolymer is greater than 0.01 g/10 min.
11. The process as claimed in claim 1 , wherein a graph of polymer molecular weight distribution of the alkene interpolymer is unimodal.
12. The process as claimed in claim 1 , wherein the process is conducted in a condensed or a supercondensed mode.
13. The process as claimed in claim 1 , wherein the copolymerization further comprises a C 3-8 alkane and a concentration of the C 3-8 alkane is lower than 10 mol %.
14. The process as claimed in claim 1 , wherein the 3-substituted C 4-10 alkene comprises more than 5 wt % of a vaporizable liquid which is continuously fed to the gas phase polymerization.