Rubber blends containing silicic acid and comprising additives containing sulphur

A silica-containing rubber mixture produced from at least one rubber, one sulphur-containing alcoxysilane, one crosslinking agent, one filler, and optionally further rubber auxiliary products, the mixture comprising:

• 0.1 to 15 parts by weight, based on 100 parts by weight of rubber used, of 1,6-bis(N,N-dibenzylthiocarbamoyldithio)hexane (CAS No.:
• 151900-44-6);
• and
• 0.1 to 15 parts by weight, based on 100 parts by weight of rubber used, of a polysulphide additive of the formula (I)
• A-S—(S)x—S—Y—S—(S)x—S-A (I)
• where
• x is 0, 1 or 2,
• Y is an aliphatic, cycloaliphatic or aromatic group that is optionally substituted or else comprises heteroatoms and
• A is a moiety
• where R1 to 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, or
• A is a moiety
• 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, or
• A is a moiety
• in which R1 to 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, —CH2—COOR5, where R5=hydrogen, C1-C6-alkyl, C5-C6-cycloalkyl, C6-C10-aryl or C1-C6-acyl and R6 is hydrogen, C1-C6-alkyl, C5-C6-cycloalkyl, C6-C10-aryl or a group —CH2—OR5, —CH2—CH2—OR5, —NHR5, —COR5, —COOR5, —CH2—COOR5, where R5=hydrogen, C1-C6-alkyl, C5-C6-cycloalkyl, C6-C10-aryl or C1-C6-acyl and y is 0, 1 or 2,
• or, if Y is —(CH2)6— and x is 0, A is
• in which
• R8 and R9 are mutually independently hydrogen, C1-C6-alkyl, C5-C6-cycloakyl, C6-C10-aryl or a group —CH2—OR5, —CH2—CH2—OR5, —CH2—COOR5, —CH2—CH2—COOR5 and R8 and R9 can also optionally form a ring together with the respective nitrogen atom, and R5 is defined as above, where both moieties A of the compound of the formula I can be identical or different, and at least one of the moieties R8 and R9 on one of the moieties A comprises one or more oxygen atoms.