C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
400/2005, 402/8,
C08J 3/24 (2006.01) C08F 255/00 (2006.01)
Patent
CA 1078545
Abstract of the Disclosure It is known to graft silane compounds to polymers during an ex- trusion process, in the presence of peroxides. In the known process there tends to be a non-homogenous mixture of the silane compound, the polymer, and the peroxide in the extruder barrel. As extrusion is a relatively high temperature process from about 180°C to 220°C there results localized cross- linking of the polymer and consequently the formation of a gel in the extruded product. The presence of a gel in the product tends to cause a rough surface making the product unsuitable for some applications such as electrical in- sulation. The present invention overcomes this drawback by providing in a method for cross-linking thermoplastic or elastomeric material wherein cross- linking is preceded by grafting of silane and is carried out in the presence of moistures, the combination of steps comprising: providing the thermo- plastic or elastomeric material as dry, fluid powder; agitating the powder to obtain fluidization thereof and raising the temperature by operation of the agitating; adding a silane compound to the material prior to completion of the agitation, the silane compound being of the variety that permits grafting on the molecules of said powder; providing for a temperature below the cry- stalite melting range so that the silane or silane compound as agitated to- gether with the said material fluid is caused to diffuse into the fluid particles and providing for grafting of the silane or silane compound mole- cules to the molecules of the thermoplastic or elastomeric material.
248531
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