Free radical polymerisation of ethylene initiated by organic peroxides with high productivity
US9045571B2 · kind B2 · utility
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Key dates
| Filing date | Feb 8, 2012 |
| Grant date | Jun 2, 2015 |
| Priority date | — |
| Expiry date | Feb 22, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F110/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for manufacturing polyethylene or an ethylene copolymer, including a step of free radical polymerization or copolymerization of the ethylene at an initiation temperature varying from 150° C. to 200° C., at a pressure varying from 500 to 3000 bar, in the presence of a peroxidic polymerization initiator selected from among the peroxide compounds of formula (I) in which R1 and R8 are, separately, a C2-C6 alkyl group; R2, R3, R6 and R7 are, separately, a C1-C5 alkyl group; and R4 and R5 are, separately, a C1-C6 alkyl group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.