Abstract: Novel precipitated silica particulates having low water uptake and high BET and CTAB surfaces, well adapted as reinforcing fillers for, e.g., the silicones, are conveniently prepared by heat treating certain starting material precipitated silica particulates at a temperature of at least 700.degree. C., for at least one minute.

Abstract: Mechanically improved elastomeric shaped articles include reinforcing amounts of a particulate silica filler material, said silica filler material comprising at least one precipitated silica having (i) a CTAB surface area of from 20 to 200 m.sup.2 /g, (ii) a mean projected area of aggregates of greater than about 10,000 nm.sup.2, and (iii) an inter-aggregate volume of at least 1 cm.sup.3 /g and an essentially homogeneous inter-aggregate pore population.

Abstract: Improved precipitated silica particulates, well adapted as a pigment or reinforcing filler for curable organosilic polymers and other elastomers, have the properties:______________________________________ (i) BET surface area 190 to 340 m.sup.2 /g (ii) CTAB surface area 180 to 280 m.sup.2 /g (iii) ##STR1## 0.9 to 1.2 (iv) Residual sodium content < 500 ppm (v) pH 3.5 to 6.0 (vi) Specific volume V.sub.o .gtoreq. 4.2 (vii) Amount of particles of a < 0.05%. size as will not pass through a 45.mu.

Abstract: Elastomer/filler interface agents for filled vulcanizable matrices, e.g., natural or synthetic rubber, comprise the amido reaction products of tetraethylene pentamine ("TEPA") with amide-forming organosulfur compounds.

Abstract: A precipitated silica having improved morphological characteristics and a process for making precipitated silica. In the precipitated silica of the present invention, the ratio of DBP oil index/CTAB specific surface area is between:7 and 4 for a range of CTAB of between 50-100 m.sup.2 /g,4 and 2.5 for a range of CTAB of between 100-200 m.sup.2 /g,2.5 and 2 for a range of CTAB of between 200-250 m.sup.2 /g,2 and 1.5 for a range of CTAB of between 250-300 m.sup.2 /g, and1.5 and 1.2 for a range of CTAB of between 300-350 m.sup.2 /g.

Abstract: Polymeric, advantageously elastomeric, e.g., natural or synthetic rubber, matrices including a reinforcing amount of a filler therefor, e.g., inorganic particulates, further comprise, as an interfacing additive between the matrix and the reinforcing filler, the condensation product of at least one polyamine with at least one carboxylic acid.

Abstract: An improved elastomeric composition comprising an elastomer (e.g. a natural or synthetic rubber), a filler, and a coupling agent for coupling the elastomer to the filler is provided wherein the coupling agent comprises at least one silane and at least one succinimide. The filler preferably comprises a silica and the succinimide preferably is an alkenyl succinimide, especially an alkenyl succinimide which is the condensation product of a polyamine with an alkenyl succinic anhydride, the alkenyl portion of which has 3 to 100 carbon atoms. The use of silane and succinimide for coupling provides elastomer/filler compositions having highly desirable dynamic and static properties at a more acceptable price and odor level than possible using the silane alone as coupling agent.

Abstract: In a filled/plasticized polymeric composition, e.g., a natural or synthetic rubber, the compatibility between reinforcing filler and plasticizer, particularly an oil, is markedly enhanced by incorporating therein a minor amount of an alkenyl succinimide.

Abstract: A synthetic amorphous silica having a CTAB surface area of from about 80 to about 125 m.sup.2 /g and a structure index of at least 0.80 is disclosed as adapted for the reinforcement of elastomeric materials, as well as methods for the preparation thereof.