High-pressure radial ethylene polymerization process in which ethylene is polymerized with a specific polyunsaturated olefin grade
View Patent ↗The present invention relates to a high-pressure radical ethylene polymerization process in which ethylene is polymerized with a polyunsaturated olefin comprising at least 6 carbon atoms and at least two non-conjugated double bonds of which at least one is terminal, characterized in that a polyunsaturated olefin grade is used as a starting material which yields a percentage of less than 6.3% in the zero conversion test or which has a decomposition temperature as measured by DSC of 130° C. or more.
1. A high-pressure radical ethylene polymerization process in which ethylene is polymerized with a polyunsaturated olefin comprising at least 6 carbon atoms and at least two non-conjugated double bonds of which at least one is terminal, wherein a zero conversion test is carried out on a polyunsaturated olefin grade at 200 Mpa and 230° C. and a polyunsaturated olefin grade which yields a percentage of less than 6.3% in the zero conversion test is used as a starting material.
2. A high-pressure radical ethylene polymerization process in which ethylene is polymerized with a polyunsaturated olefin comprising at least 6 carbon atoms and at least two non-conjugated double bonds of which at least one is terminal, wherein a decomposition temperature of a polyunsaturated olefin grade is measured by DSC and a polyunsaturated grade, which has a decomposition temperature as measured by DSC of 130° C. or more is used as a starting material.
3. Process according to claim 2 wherein the polyunsaturated olefin grade used yields a percentage of less than 6.3% in the zero conversion test.
4. Process according to claim 1 , wherein the polyunsaturated olefin grade used as a starting material has a decomposition temperature as measured by DSC of 130° C. or more.
5. Process according to claim 1 , wherein the high pressure radical ethylene polymerization reaction is performed in a tubular reactor.
6. The process according to claim 5 , wherein the reaction mixture is heated before entering the reaction zone.
7. Process according to claim 1 , wherein the reaction mixture comprises a chain transfer agent.
8. Process according to claim 1 , wherein polyunsaturated olefin grade is present in a concentration of 0.01% to 5% based on the total weight of the reaction mixture.
9. Process according to claim 2 , wherein the high pressure radical ethylene polymerization reaction is performed in a tubular reactor.
10. Process according to claim 2 , wherein the reaction mixture comprises a chain transfer agent.
11. Process according to claim 2 , wherein polyunsaturated olefin grade is present in a concentration of 0.01% to 5% based on the total weight of the reaction mixture.