C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 23/08 (2006.01) C08K 5/14 (2006.01) C08L 53/02 (2006.01)
Patent
CA 2417107
A polymer composition obtainable by subjecting a particular crosslinkable polymer composition to dynamic crosslinking. The crosslinkable polymer composition contains (a) a block copolymer comprising two or more polymer blocks of a vinyl aromatic compound and one or more (hydrogenated) polymer blocks of a conjugated diene; (b) an olefin copolymer having a density of 0.88 to 0.92 g/cm2 and obtained through copolymerization of ethylene and an .alpha.-olefin having 4 to 12 carbon atoms ;( c) a softening agent ; and (d) an organic peroxide in respective amounts that satisfy the following relational expressions ~ to ~: 0.66 .ltorsim. Wb/Wa .ltorsim. 4 ~ 0 .ltorsim. Wc/(Wa + Wb + Wc) .ltorsim. 0.25 ~ 0.001 .ltorsim. Wd/(Wa + Wb + Wc) .ltorsim. 0.01 ~ wherein Wa, Wb, Wc and Wd represent the respective amounts (by mass) of the components (a), (b), (c) and (d), that are present in the polymer composition prior to the dynamic crosslinking. The polymer composition of the present invention is based on a thermoplastic elastomer that has various improved properties, including moldability, abrasion resistance, scratch resistance, hydrolysis resistance, softness, rubber elasticity, grip, shock absorbance, oil resistance, lightweightness and mechanical strength, and has these properties in a well-balanced manner.
La présente invention concerne une compostion polymère obtenue par réticulation dynamique d'une composition copolymère réticulable, contenant: (a) un copolymère séquencé comportant deux ou plusieurs séquences polymères vinylaromatiques et une ou plusieurs séquences polymères diène conjuguées (hydrogénées), (b) un copolymère oléfinique obtenu à partir de l'éthylène et d'une alpha -oléfine C4-12, et présentant une densité comprise entre 0,88 et 0,92 g/cm<3>, (c) un adoucisssant, et enfin (d) un peroxyde organique à des doses correspondant aux équations (1) à (3): 0,66 </= Wb / Wa </= 4 (1) 0 </= Wc/ (Wa+ Wb + Wc) </= 0,25 (2), 0,001 </= Wd/ (Wa + Wb + Wc) </= 0,01 (3), (Wa, Wb, Wc, et W représentant les teneurs (en poids) des ingrédients (a), (b), (c) et (d), dans la composition polymère avant la réticulation dynamique.
Kitano Hajime
Uno Masanari
Wada Koichi
Kirby Eades Gale Baker
Kuraray Co. Ltd.
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