Production method of polyolefin, polyolefin and 1-hexene for linear low density polyethylene production raw material
View Patent ↗The object of the present invention is to provide a production method for a polyolefin, in which catalyst activity is improved, and a polyolefin such as a linear low density polyethylene can advantageously be industrially produced. The present invention relates to a production method for a polyolefin, in which in producing a polyolefin by the polymerization reaction of an olefin using a catalyst, an organohalide is present in the reaction system in an amount of from 0.05 to 10 ppm by weight in terms of the halogen atom as a concentration in a raw material olefin, and 1-hexene for linear low density polyethylene production raw material, containing an organohalide in an amount of from 0.05 to 10 ppm by weight in terms of the halogen atom.
1. A production method comprising producing a polyolefin by polymerization reaction of a raw material olefin in the presence of a single-site catalyst, wherein the concentration of an organohalide to the raw material olefin is from 0.05 to 10 ppm by weight in terms of a halogen atom, wherein the organohalide is a halogenated olefin.
2. The production method as claimed in claim 1 , wherein 1-hexene is used as the raw material olefin.
3. The production method as claimed in claim 2 , wherein the 1-hexene is obtained by trimerization reaction of ethylene using a chromium series catalyst comprising a combination of a chromium compound (a), a nitrogen-containing compound (b), an aluminum-containing compound (c) and a halogen-containing compound (d).
4. A polyolefin, which comprises an organohalide in an amount of from 0.005 to 1 ppm by weight in terms of a halogen atom, wherein the organohalide is a halogenated olefin.
5. The polyolefin as claimed in claim 4 , which is a linear low density polyethylene.
6. A composition comprising 1-hexene and, based on the amount of 1-hexene, a halogenated olefin selected from the group consisting of monochloroethylene, 1,1-dichloroethylene, 1,2-dichloroethylene (cis- and trans-forms), trichloroethylene, and tetrachloroethylene, in an amount of from 0.05 to 10 ppm by weight in terms of a halogen atom.
7. The composition as claimed in claim 6 , wherein the 1-hexene is obtained by trimerization reaction of ethylene using a chromium series catalyst comprising a combination of a chromium compound (a), a nitrogen-containing compound (b), an aluminum-containing compound (c) and a halogen-containing compound (d).
8. The production method as claimed in claim 2 , wherein said concentration is from 0.1 to 10 ppm by weight.
9. The production method as claimed in claim 2 , wherein said concentration is from 0.5 to 10 ppm by weight.
10. The polyolefin as claimed in claim 4 , wherein said amount is from 0.005 to 0.5 ppm by weight.
11. The production method as claimed in claim 1 , wherein the halogenated olefin is selected from the group consisting of monochloroethylene, 1,1-dichloroethylene, 1,2-dichloroethylene (cis- and trans-forms), trichloro-ethylene, and tetrachloroethylene.
12. The polyolefin as claimed in claim 5 , wherein the linear low density polyethylene is obtained from a composition comprising 1-hexene and, based on the amount of 1-hexene, the halogenated olefin in an amount of from 0.05 to 10 ppm by weight in terms of a halogen atom.
13. The polyolefin as claimed in claim 12 , wherein the halogenated olefin is selected from the group consisting of monochloroethylene, 1,1-dichloroethylene, 1,2-dichloroethylene (cis- and trans-forms), trichloro-ethylene, and tetrachloroethylene.