Abstract: Precipitated silicas, characterized in that they have a CTAB surface area (in accordance with ASTM D 3765-92) of 200 to 400 m.sup.2 /g, a DBP index (in accordance with ASTM D 2414) between 230 and 380 ml/100 g as powder and 180-250 g/100 g as granulate, a silanol group density (V.sub.2 -NaOH consumption) of 20 to 30 ml and the following macropore size distribution which is typical of the surface area range involved, determined by means of Hg porosimetry (DIN 66 133) for specific pore size intervals (incremental mode of application):______________________________________ CTAB surface CTAB surface CTAB surface area range: area range: area range: 200-250 m.sup.2 /g 250-300 m.sup.2 /g 300-400 m.sup.2 /g Pore size interval ?nm! Hg consumption in ml/g of silica ______________________________________ 10-20 0.27-0.49 0.35-0.50 0.32-0.42 20-30 0.22-0.32 0.15-0.30 0.17-0.22 30-40 0.15-0.21 0.12-0.17 0.12-0.15 40-50 0.11-0.16 0.09-0.12 0.08-0.11 50-60 0.08-0.12 0.06-0.10 0.06-0.

Abstract: Precipitated silicas, characterized in that they have a CTAB surface area (in accordance with ASTM D 3765-92) of 200 to 400 m.sup.2 /g, a DBP index (in accordance with ASTM D 2414) between 230 and 380 ml/100 g as powder and 180-250 g/100 g as granulate, a silanol group density (V.sub.2 -NaOH consumption) of 20 to 30 ml and the following macropore size distribution which is typical of the surface area range involved, determined by means of Hg porosimetry (DIN 66 133) for specific pore size intervals (incremental mode of application):______________________________________ CTAB surface CTAB surface CTAB surface area range: area range: area range: 200-250 250-300 300-400 Pore size m.sup.2 /g m.sup.2 /g m.sup.2 /g interval ?nm! Hg consumption in ml/g of silica ______________________________________ 10-20 0.27-0.49 0.35-0.50 0.32-0.42 20-30 0.22-0.32 0.15-0.30 0.17-0.22 30-40 0.15-0.21 0.12-0.17 0.12-0.15 40-50 0.11-0.16 0.09-0.12 0.08-0.11 50-60 0.08-0.12 0.06-0.10 0.06-0.

Abstract: The invention relates to mixtures including resorcinol and silica which are used as adhesion promoters for improving the adhesion between textile or metal strength carriers and rubber or plastics. The mixtures in accordance with the invention exhibit a sharply limited sublimation behavior with regard to the resorcin.

Abstract: A process for the production of plastic and rubber compositions filled with carbon black in which an organosilicon compound is used and is reacted in situ with the carbon black. The organosilicon compound is selected from 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)orR.sup.1.sub.n --(RO).sub.3-n Si-(Alkenyl) (III)in whichB=--SCN, --SH, --Cl--NH.sub.2 (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 preferably C.sub.6 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 and preferably C.sub.2-8 hydrocarbon radical,Alkenyl=a monofunctional, linear or branched unsaturated C.sub.2-20 and preferably C.sub.

Abstract: The invention relates to mixtures including resorcinol and silica which are used as adhesion promoters for improving the adhesion between textile or metal strength carriers and rubber or plastics. The mixtures in accordance with the invention exhibit a sharply limited sublimation behavior with regard to the resorcin.

Abstract: Moulding materials vulcanizable by means of the action of heat which contain a thiocyanatopropyltrialkoxysilane and a method of their manufacture are disclosed.

Abstract: Moulding materials are disclosed which are vulcanizable by means of the development of heat, and are provided with aluminum- and/or magnesium hydroxide in a flame-resistant manner and contain a thiocyantopropyltrialkoxy silane.

Abstract: The invention relates to N,N'- and N,N',N'-substituted silyl ureas of the general formula ##STR1## and to their use as antidegradation agents which can not be washed out in polymers, especially rubber.