HIGH-SPEED CROSSLINKING OF GRAFTED PLASTOMERS Russian patent published in 2022 - IPC C08F8/12 C08F8/42 C08K5/00 C08K5/42 C08L9/00 C08L23/08 

FIELD: catalysts.

SUBSTANCE: present invention relates to a method for crosslinked composition. Method includes the stages of: (a) providing an ethylene-alpha-olefin plastomer; (b) grafting an ethylene-alpha-olefin plastomer with a silane crosslinking agent by the formula CH2=CR-(COO)x(CnH2n)ySiR'3 so that the content of the silane crosslinking agent is in the range from 0.1 to 10.0 wt.% relative to the grafted ethylene-alpha-olefin plastomer; (c) interacting said grafted ethylene-alpha-olefin plastomer with 2 to 8 wt.% of a tin-free silane crosslinking catalyst relative to the resulting mixture, forming an intermediate composition and further forming a crosslinked composition containing at least 60% gel. The ethylene-alpha-olefin plastomer constitutes a copolymer of ethylene with 1-octene and has a density from 850 kg/m³ to 900 kg/m³ and a melt flow rate from 0.3 to 50 g/10 min. The tin-free catalyst contains an aromatic sulphonic acid including the formula Ar(SO3H)x. Stage (c) is conducted in an extruder and at a temperature from 120 to 210°C. The content of gel in said crosslinked composition after 15 minutes is at least 60%.

EFFECT: development of a method for high-speed crosslinking of grafted plastomers.

8 cl, 1 tbl, 3 ex