A compounding process for achieving uniform, fine particle...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 3/205 (2006.01) C08K 5/33 (2006.01) C09J 121/00 (2006.01) C09J 123/16 (2006.01)

Patent

CA 2364619

Rubber curing agents such as quinoids are compounded to achieve a uniform or homogeneous distribution thereof in a rubber composition. The quinoid curing agents are initially solubilized in an organic polar solvent and then mixed with the rubber or rubber masterbatch. The organic polar solvent is then removed. A uniform fine distribution of the curing agent results in improved physical properties. The process is an improvement in that it does not require the rubber masterbatch be dissolved in a nonpolar solvent. The present invention is particularly suitable as a sealant composition for tires.

Selon l'invention, on combine des agents de vulcanisation du caoutchouc, tels que des composés quinoïdes, de façon que ces agents soient répartis de manière uniforme ou homogène dans un mélange caoutchouté. Les agents de vulcanisation quinoïdes sont d'abord solubilisés dans un solvant polaire organique, puis mélangés avec le caoutchouc ou le mélange monté de caoutchoucs. On élimine ensuite le solvant polaire organique. Une répartition uniforme de l'agent de vulcanisation permet d'améliorer les propriétés physiques. Ce procédé constitue une amélioration en ce sens qu'il ne nécessite pas une dissolution du mélange monté de caoutchoucs dans un solvant non polaire. La présente invention peut notamment fournir une composition antifuite pour les pneus.

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