High speed cross-linking of grafted plastomers

US11981781B2 · kind B2 · utility

Assignee

• Borealis AG · AT

Inventors

• Oscar Prieto · Jönköping, SE
• Jeroen Oderkerk · Stenungsund, SE
• Jari-Jussi Ruskeeniemi · Porvoo, FI
• Stefan Hellstrom · Stenungsund, SE
• Tanja Piel · Linz, AT
• Daniela Mileva · Linz, AT

Key dates

• Filing date: Sep 26, 2019
• Grant date: May 14, 2024
• Expiry date: Dec 12, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2312/08
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention discloses a process for providing a cross-linked composition, the process comprising the steps of (a) providing an ethylene-α-olefin plastomer having—a density of from 850 kg/m3 to 900 kg/m3; and—an melt flow rate (ISO 1133, 2.16 kg, 190° C.) of 0.3 to 50 g/10 min; (b) grafting the ethylene-α-olefin plastomer with silane crosslinker such that the content of silane crosslinker is in the range of 0.1 to 10.0 wt. % with respect to the grafted ethylene-α-olefin plastomer; (c) contacting said grafted ethylene-α-olefin plastomer with 2 to 8 wt. % of a tin-free silane crosslinking catalyst with respect to the resulting mixture of grafted ethylene-α-olefin plastomer and tin-freesilane crosslinking catalyst, wherein said tin-free catalyst comprises a Brönsted acid at 23° C. and 50% relative humidity for at least 15 minutes thus forming a cross-linked composition, wherein gel content of said cross-linked composition after 15 min is at least 60%.