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AssigneeLANXESS Deutschland GmbH
InventorsMelanie Wiedemeier, Hermann-Josef Weidenhaupt, Ulrich Feldhues, Irene Moll
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The present invention relates to silica-containing rubber mixture produced from at least one rubber, from a sulphur-containing alkoxysilane, from a crosslinking agent, from a filler, and optionally from further rubber auxiliaries, where the said mixture comprises from 0.1 to 15 parts by weight, based on 100 parts by weight of rubber used, of a silicon-free polysulphide additive of the formula (I) A-S—(S)x—S—B (I) in which x is 0, 1, 2, 3 or 4, A is a moiety and B is a moiety in which R1 to R4 are identical or different and are hydrogen, C1-C6-alkyl, C5-C6-cycloalkyl, C6-C10-aryl or a group —CH2—OR5, —CH2—CH2—OR5, —NHR5, —COR5, —COOR5, —CH2COOR5, where R5=hydrogen, C1-C6-alkyl, C5-C6-cycloalkyl, C6-C10-aryl or C1-C6-acyl, and R6 to R7 are identical or different and are hydrogen C1-C6-alkyl, C5-C6-cycloalkyl, C6-C10-aryl or a group —CH2—OR5, —CH2—CH2—OR5, —NHR5, —COR5, —COOR5, —CH2COOR5, with R5=hydrogen, C1-C6-alkyl, C5-C6-cycloalkyl, C6-C10-aryl or C1-C6-acyl and y, z are mutually independently 0, 1 or 2, or A and B are mutually independently one of the moieties in which R1 and R2 are identical or different and are hydrogen, C1-C6-alkyl, C5-C6-cycloalkyl, C6-C10-aryl or a group —CH2—OR5, —CH2—CH2—OR5, —NHR5, —COR5, —COOR5, —CH2COOR5, where R5=hydrogen, C1-C6-alkyl, C5-C6-cycloalkyl, C6-C10-aryl or C1-C6-acyl.
Silica-containing rubber mixture produced from at least one rubber, from a sulphur-containing alkoxysilane, from a crosslinking agent, from a filler, and optionally from further rubber auxiliaries, characterized in that the said mixture comprises from 0.1 to 15 parts by weight, based on 100 parts by weight of rubber used, of a silicon-free polysulphide additive of the formula (I)
Silica-containing rubber mixture according to any of the preceding claims, characterized in that the amount of sulphur-containing alkoxysilanes is greater than or equal to the amount of silicon-free polysulphide additives.
Silica-containing rubber mixture according to any of the preceding claims, characterized in that it comprises at least one SBR rubber and at least one BR rubber.
Silica-containing rubber mixture according to any of the preceding claims, characterized in that it comprises from 1 to 15 parts by weight of one or more sulphur-containing alkoxysilanes, based on 100 parts by weight of rubber used.
Silica-containing rubber mixture according to any of the preceding claims, characterized in that it comprises from 0.3 to 7 parts by weight of one or more silicon-free polysulphide additives, based on 100 parts by weight of rubber used.
Silica-containing rubber mixture according to any of the preceding claims, characterized in that the sulphur-containing alkoxysilane is used in a ratio by weight of from 1.5:1 to 20:1, preferably from 5:1 to 15:1, in relation to the silicon-free polysulphide additive.
Silica-containing rubber mixture according to any of the preceding claims, characterized in that the said mixture comprises from 0.5 to 5 parts by weight, based on 100 parts by weight of rubber used, of a silicon-free polysulphide additive.
Silica-containing rubber mixture according to any of the preceding claims, characterized in that it comprises one or more inorganic and/or organic fillers, where the amounts used of the fillers are in the range from 50 to 200 parts by weight, preferably from 60 to 120 parts by weight, based on 100 parts by weight of rubbers used.
Silica-containing rubber mixture according to any of the preceding claims, characterized in that the loss factor tan delta of a vulcanizate produced therefrom by heating at 170° C./t95 is <0.2 at 60° C. and the Shore A hardness thereof is simultaneously >67 at 23° C. and the 300 modulus value thereof is >12 MPa, preferably >15 MPa.
Silica-containing rubber mixture according to any of the preceding claims, characterized in that the loss factor tan delta of a vulcanizate produced therefrom by heating at 170° C./t95 is <0.17 at 60° C. and the Shore A hardness thereof is simultaneously >70 at 23° C.
Silica-containing rubber mixture according to any of the preceding claims, characterized in that the loss factor tan delta of a vulcanizate produced therefrom by heating at 170° C./t95 is less than 0.17 at 60° C. and its scorch time is simultaneously greater than 1000 seconds.
Silica-containing rubber mixture according to any of the preceding claims, characterized in that the loss factor tan delta of a vulcanizate produced therefrom by heating at 170° C./t95 is less than 0.17 at 60° C. and its full vulcanization time is simultaneously less than 2000 seconds.
Silica-containing rubber mixture according to any of the preceding claims, characterized in that the scorch time of a vulcanizate produced therefrom by heating at 170° C./t95 is greater than 1000 seconds and its full vulcanization time is simultaneously less than 2000 seconds.
Use of the rubber mixture according to any of the preceding claims for producing vulcanizates and rubber mouldings of any type, in particular for producing tyres and tyre components.
Vulcanizates and rubber mouldings of any type, in particular tyres and tyre components, based on rubber mixtures according to any of the preceding claims.
Polysulphide additives of the formula
Dependencies are inferred from the claim text.