Patent ID: 9623618
Date: 2017-04-18
CPC Classifications: B29B,B29D,B29K,B60C,C08K,C08L

Claim:
1. A method for obtaining a tread portion that during its use assumes a porous surface with a 75 to 800 μm 2 pore area; said method comprising a preparation phase of a rubber compound, wherein: in a first mixing step a polymer base selected from SBR, BR, NR and mixtures thereof, 5 to 20 phr of recycled rubber having 75 to 800 μm in size, and silica are mixed together; and in a second mixing step a curing system is added and mixed to the compound from the first mixing step; said method being characterized by the fact that said recycled rubber is treated beforehand cryogenically and is added to said first mixing step without being beforehand pre-mixed with any polymer base.