Rhone-poulenc Industries

Rhone-poulenc Chimie De Base

Rhone-poulenc Chimie

Jean Machurat

Jean-Claude Morawski

Gerard Soula

Georges Vrisakis

Robert Lagarde

Joel Le Ludec

Vulcanizable elastomeric compositions comprise a halobutyl rubber matrix, an adhesion-promoting amount of a epoxidized natural rubber and a reinforcing amount of a siliceous inorganic filler material; the vulcanizates produced therefrom are well suited, for example, as impermeable sealing layers/coatings for tire carcasses.

Halobutyl/epoxidized rubber matrices reinforced with siliceous filler

Improved precipitated silica particulates, well adapted as a pigment or reinforcing filler for curable organosilic polymers and other elastomers, have the properties:

Novel precipitated silica particulates

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.

Sulfurized tepa/amido compounds as interface agents for vulcanizable

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.

Filled polymeric compositions comprising novel polymer/filler

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.

Coupling agent compositions for coupling an elastomer to a filler and

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.

Compatibly filled/plasticized polymeric compositions

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.

Synthetic amorphous silica for elastomeric reinforcement and methods

Silica plastic compositions containing a silicate filler finely dispersed therein are produced by simultaneously adding a mixture of an aqueous solution of an alkali silicate and a coagulable latex emulsion of a plastic polymeric material and a solution of at least one salt of hydrochloric or sulfuric acids and a metal selected from the group consisting of zinc, magnesium, calcium, and maintaining the pH of the reaction medium at a level appropriate for the precipitation of the neutral silicate of the metal, yet at which precipitation of either hydroxy salts of the metal or of alkaline silicates is substantially precluded.

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Neuville sur Saone, France

Jean Machurat