Patent ID: 6686408
Filing Date: 2004-02-03
Classification: B29B,C08J,C08K

Abstract:
A method of preparing curable-rubber mixtures containing silica, for producing treads, the method being characterized by comprising at least a first step to obtain a first mixture by simultaneously loading into a mixer and mixing together at least a cross-linkable unsaturated-chain polymer base, a silica reinforcing filler, and a silane bonding agent; wherein the ingredients are mixed together in one uninterrupted mixing comprising a first part, in which said mixer is operated at a first mixing speed, the first part terminating on reaching a temperature ranging from 120Â° C. to 145Â° C., and a second successive part, in which the mixer is operated at a second mixing speed lower than the first mixing speed, the second mixing speed maintaining a temperature ranging from 150Â° C. to 165Â° C.