Partitioning agent for rubber

Details Partitioning agent for rubber Partitioning agent for rubber

C - Chemistry, Metallurgy

09

D

C09D 109/00 (2006.01) B29C 33/62 (2006.01) B29C 37/00 (2006.01) C08J 7/04 (2006.01)

Patent

CA 2242712

This invention discloses an aqueous slurry for coating the surface of rubber slabs or pellets to reduce the tendency of the rubber slabs or pellets to stick together, said aqueous slurry being comprised of (1) from about 1 weight percent to about 15 weight percent of syndiotactic-1,2-polybutadiene having a melting point of no more than about 140°C and a particle size of no more than about 40 mesh; (2) from about 0.1 weight percent to about 5 weight percent of a suspending agent; (3) from about 0.05 weight percent to about 2 weight percent of a wetting agent; and (4) from about 78 weight percent to about 98 weight percent water. The present invention further reveals a coated rubber slab having resistance to sticking which is comprised of a rubber slab having a coating thereon, wherein said coating is comprised of syndiotactic-1,2-polybutadiene having a melting point of no more than about 140°C and a particle size of no more than about 40 mesh.

L'invention porte sur un coulis aqueux pour revêtir la surface de plaques ou de granules de caoutchouc afin de réduire la tendance des plaques ou des granules à coller l'une à l'autre. Ledit coulis aqueux est constitué : 1) d'environ 1-15 % en poids de poly(1,2-polybutadiène) syndiotactique possédant un point de fusion ne dépassant pas 140 degrés C environ et une taille granulométrique ne dépassant pas 40 mailles environ; 2) d'environ 0,1-5 % en poids d'un agent de mise en suspension; 3) d'environ 0,05-2 % en poids d'un agent mouillant; 4) d'environ 78-98 % en poids d'eau. La présente invention porte également sur une plaque de caoutchouc enrobée, résistant à l'adhérence, l'enrobage étant constitué de poly(1,2-polybutadiène) syndiotactique possédant un point de fusion ne dépassant pas 140 degrés C environ et une taille granulométrique ne dépassant pas 40 mailles environ.

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