Rubber mixtures with polyurea fillers
OwnerThomas Scholl, Roland Parginventors
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Abstract
Rubber mixtures according to the invention consist of rubber and specific polyurea fillers with a particle size of 0.001 to 500 μm and are particularly suitable for producing rubber vulcanizates and rubber molded items with low specific weights and low dynamic damping, in particular for producing low-damping tires and industrial rubber articles with a demanding range of physical requirements.
Claims11
Rubber mixtures comprising a rubber and 1 to 300 parts by wt., with respect to 100 parts by wt. of rubber, of a polyurea filler with a particle size of 0.001 to 500 μm and optionally, further rubber auxiliary substances and cross-linking agents.
A process for preparing polyurea-filled rubber mixtures comprising a rubber and 1 to 300 parts by wt., with respect to 100 parts by wt. of rubber, of a polyurea filler with a particle size of 0.001 to 500 μm and optionally, further rubber auxiliary substances and cross-linking agents, comprising the steps of reacting a polyisocyanate with a polyamine and/or water at temperatures of −50 to 250° C. in a solvent with precipitation of the polyurea, and adding a solution of a rubber to the polyurea obtained and removing the solvent.
A molded item comprising rubber mixtures comprising a rubber and 1 to 300 parts by wt., with respect to 100 parts by wt. of rubber, of a polyurea filler with a particle size of 0.001 to 500 μm and optionally, further rubber auxiliary substances and cross-linking agents.
A vulcanizate comprising a rubber and 1 to 300 parts by wt., with respect to 100 parts by wt. of rubber, of a polyurea filler with a particle size of 0.001 to 500 μm and optionally, further rubber auxiliary substances and cross-linking agents.
Dependencies are inferred from the claim text.