Methods to prepare elastomer compounds are described that include dry mixing at least one additive to an elastomer composite masterbatch at low temperatures over a shortened mixing cycle with reduced energy consumption. The elastomer composite masterbatch is produced in a liquid masterbatch process. The resulting elastomer compounds are further described as well as property improvements that can be achieved.

Methods to prepare elastomer compounds are described that include dry mixing at least one additive to an elastomer composite masterbatch at low temperatures over a shortened mixing cycle with reduced energy consumption. The elastomer composite masterbatch is produced in a liquid masterbatch process. The resulting elastomer compounds are further described as well as property improvements that can be achieved.

A method for producing a rubber wet master batch is disclosed including: producing a carbon black-containing rubber latex solution by mixing carbon black, a dispersion solvent and a rubber latex solution; producing a carbon black-containing rubber coagulum by coagulating the thus-obtained carbon black-containing rubber latex solution; and producing a rubber wet master batch by dehydrating and drying the thus-obtained carbon black-containing rubber coagulum. With respect to this method for producing a rubber wet master batch, the carbon black satisfies conditions such that: the DBP oil absorption is 105-230 mL/100 g; STSA is 90-205 m.sup.2/g; and the value obtained by subtracting the value of STSA from the value of DBP oil absorption is 15 or more. This method for producing a rubber wet master batch enables the achievement of a vulcanized rubber that has wear resistance and low heat generation properties.

A method for producing a rubber wet master batch is disclosed including: producing a carbon black-containing rubber latex solution by mixing carbon black, a dispersion solvent and a rubber latex solution; producing a carbon black-containing rubber coagulum by coagulating the thus-obtained carbon black-containing rubber latex solution; and producing a rubber wet master batch by dehydrating and drying the thus-obtained carbon black-containing rubber coagulum. With respect to this method for producing a rubber wet master batch, the carbon black satisfies conditions such that: the DBP oil absorption is 105-230 mL/100 g; STSA is 90-205 m.sup.2/g; and the value obtained by subtracting the value of STSA from the value of DBP oil absorption is 15 or more. This method for producing a rubber wet master batch enables the achievement of a vulcanized rubber that has wear resistance and low heat generation properties.

A method for producing a rubber wet master batch is disclosed including: producing a carbon black-containing rubber latex solution by mixing carbon black, a dispersion solvent and a rubber latex solution; producing a carbon black-containing rubber coagulum by coagulating the thus-obtained carbon black-containing rubber latex solution; and producing a rubber wet master batch by dehydrating and drying the thus-obtained carbon black-containing rubber coagulum. With respect to this method for producing a rubber wet master batch, the carbon black satisfies conditions such that: the DBP oil absorption is 105-230 mL/100 g; STSA is 90-205 m.sup.2/g; and the value obtained by subtracting the value of STSA from the value of DBP oil absorption is 15 or more. This method for producing a rubber wet master batch enables the achievement of a vulcanized rubber that has wear resistance and low heat generation properties.

A latex dipped article, specifically an unsupported glove having magnetically detectable property and its method of manufacturing is disclosed here. The glove contains at least one layer of elastomeric material that consist of a composition of evenly dispersed natural mineral composite containing; magnetite, illmenite, zircorn and quartz. The composition renders the article or small pieces of the latex dipped article magnetically detectable property.

A latex dipped article, specifically an unsupported glove having magnetically detectable property and its method of manufacturing is disclosed here. The glove contains at least one layer of elastomeric material that consist of a composition of evenly dispersed natural mineral composite containing; magnetite, illmenite, zircorn and quartz. The composition renders the article or small pieces of the latex dipped article magnetically detectable property.

A latex dipped article, specifically an unsupported glove having magnetically detectable property and its method of manufacturing is disclosed here. The glove contains at least one layer of elastomeric material that consist of a composition of evenly dispersed natural mineral composite containing; magnetite, illmenite, zircorn and quartz. The composition renders the article or small pieces of the latex dipped article magnetically detectable property.

An aqueous adhesive for rubber includes rubber latex and an ammonium-salt-based vulcanization acceleration aid. An amount of the ammonium-salt-based vulcanization acceleration aid contained in the aqueous adhesive is preferably not less than 0.01% by weight and not greater than 5.0% by weight in terms of solid content. An aqueous adhesive for a ball includes rubber latex as a main component. A content of an inorganic filler in the aqueous adhesive is not greater than 0.1% by weight in terms of solid content. A ball 2 includes a hollow core 4 obtained by crosslinking a rubber composition that contains a vulcanizing agent. The core 4 is formed of two hemispherical half cores. The two half cores are adhered to each other by using the aqueous adhesive for a ball.

An aqueous adhesive for rubber includes rubber latex and an ammonium-salt-based vulcanization acceleration aid. An amount of the ammonium-salt-based vulcanization acceleration aid contained in the aqueous adhesive is preferably not less than 0.01% by weight and not greater than 5.0% by weight in terms of solid content. An aqueous adhesive for a ball includes rubber latex as a main component. A content of an inorganic filler in the aqueous adhesive is not greater than 0.1% by weight in terms of solid content. A ball 2 includes a hollow core 4 obtained by crosslinking a rubber composition that contains a vulcanizing agent. The core 4 is formed of two hemispherical half cores. The two half cores are adhered to each other by using the aqueous adhesive for a ball.