Silica masterbatch made with emulsion and solution rubber
First Claim
1. A process for making a masterbatch of silica and solution-made rubber, comprising the steps of:
- making a hydrophobated silica slurry by;
mixing silica into water in a vessel;
preparing an aqueous solution of silane; and
adding the aqueous solution of silane to the vessel to make the hydrophobated silica slurry;
adding a dispersant, a coagulant and water to a reactor, thereby forming an aqueous dispersant-coagulant mixture;
adding a mixture of solution-made rubber and organic solvent to the reactor;
adding the hydrophobated silica slurry to the reactor;
adding a process oil to the reactor to make a reactor mixture;
steam distilling the reactor mixture; and
recovering a masterbatch of silica and solution-made rubber.
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Abstract
The present invention provides a process for making a silica masterbatch that contains hydrophobated silica, solution-made rubber and emulsion-made rubber. Hydrophobated silica is mixed into a latex emulsion. Solution-rubber crumb in an aqueous suspension is mixed into the latex emulsion, which is coagulated, and a crumb is recovered, further homogenized, dried and baled to yield the silica masterbatch. A well-dispersed mixture of hydrophobated silica and emulsion-made rubber is added into a steam distillation step of a solution-rubber process from which a silica masterbatch is recovered. The emulsion-made rubber can be omitted to make a silica masterbatch of solution rubber and silica without emulsion rubber. The silica masterbatch has physical properties similar to those found in a comparable dry-mixed composition, but the silica masterbatch can be incorporated more easily and less expensively into tires and other rubber products than the dry-mixed composition.
55 Citations
13 Claims
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1. A process for making a masterbatch of silica and solution-made rubber, comprising the steps of:
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making a hydrophobated silica slurry by; mixing silica into water in a vessel; preparing an aqueous solution of silane; and adding the aqueous solution of silane to the vessel to make the hydrophobated silica slurry; adding a dispersant, a coagulant and water to a reactor, thereby forming an aqueous dispersant-coagulant mixture; adding a mixture of solution-made rubber and organic solvent to the reactor; adding the hydrophobated silica slurry to the reactor; adding a process oil to the reactor to make a reactor mixture; steam distilling the reactor mixture; and recovering a masterbatch of silica and solution-made rubber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification