Abstract: Base compositions for addition-crosslinking silicone compositions are continuously produced by, in a first stage, homogeneously mixing and kneading organopolysiloxanes and flowable prehydrophobized oxidic reinforcing fillers in a continuous kneading machine with kneading chambers arranged alongside one another. In a second, downstream, stage of the process, the compositions produced in the first stage are subjected to aftertreatment in a mixing apparatus in which the compositions have been subjected to a mixing procedure with introduction of shear force.

Abstract: The object of the invention is addition cross-linkable silicone masses (M), comprising: A) 100 parts by weight of polydiorganosiloxane containing alkenyl groups, said siloxane having at least 2 alkenyl groups per molecule, a viscosity of at least 1 000 000 mPa·s and at most 0.3 mol-% alkenyl groups, B) SiH-functional cross-linking agents, C) hydrosilylation catalyst, D) 10-80 parts by weight of a stiffening filler having a specific surface area of 50 m2/g to 350 m2/g and E) silicon oil with a viscosity of 20-5000 mPa·s, the radicals thereof being selected from phenyl and C1-6 alkyl radicals, wherein at least 5 mol-% of all radicals are phenyl radicals, a method for manufacturing the addition cross-linkable silicone masses (M), silicone elastomers obtained through the cross-linking of addition cross-linkable silicone masses (M).

Abstract: Addition-crosslinkable silicone compositions contain (A) 100 parts by weight of polydiorganosiloxane(s) which has alkenyl groups and whose viscosity is from 5000 to 50,000,000 mPas at 25° C., having at least 2 alkenyl groups per molecule, and at least 0.15 mol % of alkenylsiloxane units, based on all siloxane units, (B) from 1 to 50 parts by weight of polydiorganosiloxane(s) whose viscosity is at least 5,000,000 mPas at 25° C., and having no alkenyl groups, (C) SiH-functional crosslinking agent(s), (D) hydrosilylation catalyst(s), and (E) from 3 to 90 parts by weight of filler(s) whose BET specific surface area is at least 50 m2/g. Vulcanizates of the addition-crosslinkable silicone compositions have low coefficients of friction.

Abstract: Base compositions for addition-crosslinking silicone compositions are continuously produced by, in a first stage, homogeneously mixing and kneading organopolysiloxanes and flowable prehydrophobized oxidic reinforcing fillers in a continuous kneading machine with kneading chambers arranged alongside one another. In a second, downstream, stage of the process, the compositions produced in the first stage are subjected to aftertreatment in a mixing apparatus in which the compositions have been subjected to a mixing procedure with introduction of shear force.

Abstract: Addition curable elastomer compositions whose cured products exhibit high elongation at break and high tear propagation resistance are prepared from specific molecular weight ranges of alkenyl-terminal, alkenyl-pendant, and substantially non-functional organopolysiloxanes.

Abstract: Addition-crosslinkable silicone compositions contain (A) 100 parts by weight of polydiorganosiloxane(s) which has alkenyl groups and whose viscosity is from 5000 to 50,000,000 mPas at 25° C., having at least 2 alkenyl groups per molecule, and at least 0.15 mol % of alkenylsiloxane units, based on all siloxane units, (B) from 1 to 50 parts by weight of polydiorganosiloxane(s) whose viscosity is at least 5,000,000 mPas at 25° C., and having no alkenyl groups, (C) SiH-functional crosslinking agent(s), (D) hydrosilylation catalyst(s), and (E) from 3 to 90 parts by weight of filler(s) whose BET specific surface area is at least 50 m2/g. Vulcanizates of the addition-crosslinkable silicone compositions have low coefficients of friction.

Abstract: The invention relates to a process for producing mixtures which contain a finely divided, surface-treated filler, silicones and, if appropriate, further additives, and which can be used for producing crosslinkable silicone rubber compositions, wherein the crosslinkable silicone rubber compositions produced from the filler/silicone mixtures produced have excellent viscosity stability, improved processability, and lead to silicone elastomers having an improved property profile.

Abstract: Silicone compositions containing: (A) 100 parts by weight of organopolysiloxane(s) having an OH content, based on Si-bonded OH groups, of 1 to 100 weight ppm; and (B) 1-200 parts by weight of filler(s) having a specific surface area of at least 50 m2/g, exhibit surprising stability and are useful for preparing numerous compositions where a stable viscosity is desirable.

Abstract: Silicone materials, in particular crosslinkable silicone materials, which are distinguished by outstanding storage stability, as evidenced by substantially constant flowability and viscosity, are provided by incorporating from 10 ppm to 110 ppm ammonia or the equivalent amount of an ammonia liberating compound.

Abstract: Addition crosslinkable organopolysiloxane compositions which cure to organopolysiloxane elastomers of high elongation at break and high tear resistance contain a high viscosity, alkenyl-terminated, and substantially pendant alkenyl group-free organopolysiloxane, an organopolysiloxane having pendant alkenyl groups and optionally alkenyl-terminal groups, an Si—H functional crosslinker, and a hydrosilylation catalyst.

Abstract: Addition curable elastomer compositions whose cured products exhibit high elongation at break and high tear propagation resistance are prepared from specific molecular weight ranges of alkenyl-terminal, alkenyl-pendant, and substantially non-functional organopolysiloxanes.

Abstract: Crosslinkable silicone materials having both extended processing time and storage stability include hydrosilylatable organopolysiloxane and Si—H crosslinker, both containing trifluoropropyl groups, the crosslinker free of terminal Si—H functionality. Silicone elastomers prepared therefrom have good solvent resistance and outstanding mechanical properties.

Abstract: Silicone compositions containing: (A) 100 parts by weight of organopolysiloxane(s) having an OH content, based on Si-bonded OH groups, of 1 to 100 weight ppm; and (B) 1-200 parts by weight of filler(s) having a specific surface area of at least 50 m2/g, exhibit surprising stability and are useful for preparing numerous compositions where a stable viscosity is desirable.

Abstract: The invention relates to silicone compositions which can be crosslinked to give elastomers and which comprises the constituents (A) from 20 to 99% by weight of polyorganosiloxane containing at least two alkenyl groups per molecule and having a viscosity at 25° C. of from 0.1 to 500,000 Pa.s, (B) from 1 to 80% by weight of non-reinforcing filler having a mean particle size of from 0.1 to 200 &mgr;m and a specific surface area of <100 m2/g, (C) a crosslinking component comprising (C1) an organic peroxide, or (C2) an organosilicon compound containing at least two SiH functions per molecule in combination with a hydrosilylation catalyst, and (D) a nitrogen compound which is selected from amino, ammonium and amido compounds and nitrogen-containing organosilicon compounds. The compositions exhibit improved thermal stability and resistance to oil at elevated temperatures.

Abstract: The invention relates to silicone compositions which can be crosslinked to give elastomers and which comprises the constituents

Abstract: In a continuous process for producing filler-containing silicone compositions (P), a silicone composition (E) comprising filler (F1) is mixed with filler (F2).

Abstract: Organopolysiloxane particles containing hydrosilylation catalysts (H) and organopolysiloxane (O) and having a particle size of 0.01-10 &mgr;m have, at least in the outermost shell, no glass-transition temperature, softening point or melting point in the range 20° C.-260° C. These organopolysiloxane particles enable the preparation of one-component, addition-crosslinking, thermocurable silicone compositions having a long shelf life.

Abstract: Polymers and oligomers of olefinically unsaturated C.sub.2 -C.sub.20 -hydrocarbons having one or two 2-oxazolinyl end groups have the structure (I) ##STR1## where A is a polymer or oligomer radical derived from the olefinically unsaturated C.sub.2 -C.sub.20 -hydrocarbons and the radicals R can be identical or different and have the following meanings:hydrogen,C.sub.1 -C.sub.10 -alkyl,C.sub.6 -C.sub.10 -aryl,C.sub.3 -C.sub.6 -cycloalkyl.