Degussa Aktiengesellschaft

Pku Pulverkautschuk Union Gmbh

Degussa Aktiengsellschaft

Udo Goerl

Siegfried Wolff

Reinhard Stober

Matthias Schmitt

Karl Meier

Robert Kuhlmann

Heinz Esch

Mustafa Siray

Andreas Gouw

Andrea Hunsche

The present invention provides a process, which includes:

Rubber pellets comprising silicatic and oxidic fillers

A process for preparing silica-filled rubber powder is provided, which includes contacting a salt-containing silica-precipitation suspension with at least one selected from the group including a rubber latex, rubber solution, and rubber emulsion, to form a mixture; and precipitating to produce a silica-filled rubber powder. A silica-filled rubber powder prepared by the process, and compositions and uses containing the same, are also provided.

Modified rubber powders comprising silicatic fillers prepared from precipitation suspensions, process for their preparation and their use

A fine-particle, free-flowing rubber powder containing silicatic fillers, one or more organosilanes having trialkoxysilyl groups, and a rubber prepared by solution polymerization is prepared by a process that starts from a two-phase system: 1) filler in water, and 2) rubber in organic solvent. A rubber/silicatic filler/silane composite is formed during transfer, under gentle conditions, of the various reactants into a single phase. The process features a high degree of freedom in selecting forms of filler and in selecting the organosilane and gives a finished rubber powder in which a silicatic filler and an organosilane have undergone complete chemical reaction.

Rubber powders having pulverulent silicatic fillers and prepared from rubbers present in organic solvents, a process for their preparation, and their use

Fine-particle, filled rubber powders prepared by precipitation from aqueous mixtures of a filler suspension and a rubber-latex emulsion in the absence of water-soluble salts of metals of groups IIa, IIb, IIIa, or VIII of the Periodic Table of the Elements and in the absence of alkali metal silicate are used for vulcanizable rubber mixtures.

Process for preparing carbon-black-filled rubber powders based on aqueous polymer-latex emulsions

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):

Precipitated silicas, a process for their preparation and their use in

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.

Adhesion promoters for rubber and synthetic mixtures

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:

Process for the production of plastic and rubber compositions filled

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

Peroxide vulcanizable moulding materials and a method of their

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.

Heat vulcanizable moulding materials

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.

Growing community of inventors

Meckenheim, Germany

Udo Goerl