C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/4904, 400/64
C08L 57/00 (2006.01) C08L 23/16 (2006.01) C08L 23/22 (2006.01)
Patent
CA 2029907
The first process for preparing thermoplastic elastomer compositions provided in accordance with the present invention comprises feeding a mixture comprising (a) 90-40 parts by weight of peroxide crosslinking type olefin copolymer rubber, (b) 10-60 parts by weight of peroxide decomposition type olefin plastics (herein (a) and (b) are selected so that (a) + (b) becomes 100 parts by weight), and (c) 0-100 parts by weight of peroxide non-crosslinking type hydrocarbon rubbery substance through a hopper into a cylinder of an extrusion machine, and feeding simultaneously (d) a mineral oil type softener, or (d) a mineral oil type softener and (e) silicone oil through an inlet provided on the cylinder separately from the hopper, thereby dynamically heat treating the resulting mixture in the presence of organic peroxide to prepare a partially crosslinked thermoplastic elastomer composition. The second process for preparing thermoplastic elastomer compositions provided in accordance with the invention comprises feeding a mixture comprising the above-mentioned components (a) and (b), or (a), (b) and (c) through a hopper into a cylinder of an extrusion machine so that the retention time in the hopper of the mixture is within 10 minutes, and feeding simultaneously (d) mineral oil type softener, or (d) a mineral oil type softener and (e) silicone oil into the hopper, thereby dynamically heat treating the resulting mixture in the presence of organic peroxide to prepare a partially crosslinked thermoplastic elastomer composition.
Murakami Norishige
Murata Kazuhiko
Shimizu Shizuo
Mitsui Chemicals Inc.
Smart & Biggar
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