Process for the production of plastic and rubber compositions filled with carbon black

A process for the production of a vulcanizable plastic or rubber composition, comprising incorporating one or more organosilicon compounds of the following formulae:

• (R.sup.1.sub.n --(RO).sub.3-n Si-(Alk).sub.m --(Ar).sub.p).sub.q (B)(I)
• R.sup.1.sub.n --(RO).sub.3-n Si-(Alkyl) (II)
• or
• R.sup.1.sub.n --(RO).sub.3-n Si-(Alkenyl) (III)
• in which
• B=--SCN, --SH, --Cl (where q=1) or --S.sub.x -- (where q=2),
• R=a C.sub.1-4 alkyl or C.sub.1-4 alkoxy group or a phenyl group,
• R.sup.1 =a C.sub.1-4 alkyl group or a phenyl group,
• n=0, 1 or 2,
• Alk=a difunctional, linear or branched C.sub.1-6 hydrocarbon radical,
• m=0 or 1,
• Ar=a C.sub.6-12 arylene radical,
• p=0 or 1, with the proviso that p and n cannot both be 0,
• x=a number from 2 to 8,
• Alkyl=a monofunctional, linear or branched unsaturated C.sub.1-20 hydrocarbon radical,
• Alkenyl=a monofunctional, linear or branched unsaturated C.sub.2-20 hydrocarbon radical,
• and carbon black with an alkaline pH value into said vulcanizable composition in a quantity corresponding to the quantity which is determined as no longer extractable with an organic solvent in the reaction of carbon black with an alkaline pH value and said organosilicon compound;
• wherein said vulcanizable composition does not contain silica and wherein said carbon black has a specific surface area of less than or equal to 300 m.sup.2 /g.