초록 ▼

The present invention is further directed to a method of producing a particulate composite of silica and elastomer comprising the steps of dispersing a diene based elastomer in a hydrophobic liquid to form an elastomer dispersion;mixing the elastomer dispersion with an aqueous solution of an alkali

The present invention is further directed to a method of producing a particulate composite of silica and elastomer comprising the steps of dispersing a diene based elastomer in a hydrophobic liquid to form an elastomer dispersion;mixing the elastomer dispersion with an aqueous solution of an alkali metal silicate to form a mixture;adding a precipitating agent to the mixture to precipitate a porous silica onto the dispersed elastomer to form a particulate composite of silica and elastomer comprising a porous silica shell at least partially surrounding a core of diene based elastomer; andoptionally adding a separating agent to remove the hydrophobic liquid from the particulate composite.

대표청구항 ▼

1. A method of producing a particulate composite of silica and elastomer comprising the steps of dispersing a diene based elastomer in an oil to form an elastomer dispersion consisting essentially of elastomer and oil;mixing the elastomer dispersion with an aqueous solution of an alkali metal silica

1. A method of producing a particulate composite of silica and elastomer comprising the steps of dispersing a diene based elastomer in an oil to form an elastomer dispersion consisting essentially of elastomer and oil;mixing the elastomer dispersion with an aqueous solution of an alkali metal silicate to form a mixture;adding a precipitating agent to the mixture to precipitate a porous silica onto the dispersed elastomer to form a particulate composite of silica and elastomer comprising a porous silica shell at least partially surrounding a core of diene based elastomer; andoptionally adding a separating agent to remove the oil from the particulate composite. 2. The method of claim 1, wherein the oil is a vegetable oil or a mineral oil. 3. The method of claim 1, wherein the alkali metal silicate is sodium silicate or potassium silicate. 4. The method of claim 1, wherein the precipitating agent is an acid. 5. The method of claim 1, wherein the precipitating agent is sodium hydrogen carbonate. 6. The method of claim 1, wherein the precipitating agent is selected from the group consisting of cetyl trimethylammonium bromide and sodium dioctyl sulfosuccinate. 7. The method of claim 1, wherein the separating agent is an alcohol. 8. The method of claim 1, wherein the separating agent is selected from the group consisting of methanol, ethanol, propanol, and butanol. 9. The method of claim 1, wherein the separating agent is a hydrocarbon liquid. 10. The method of claim 1, wherein the separating agent is a hydrocarbon liquid selected from the group consisting of hexane, heptane, benzene, toluene, and cyclohexane. 11. The method of claim 1, wherein the diene based elastomer is a maleinized styrene-butadiene copolymer elastomer having a molecular weight Mn in a range of from 3000 to 15000.