Tackifying composition for rubber
AssigneeWestvaco Corporation
InventorsMitchell S. Dimitri, Carlton G. Force
Life of this patent
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Abstract
Disclosed herein is a tackifying composition for rubber comprising an alkali lignin coprecipitated with a saponified tall oil pitch from an alkaline solution of the lignin and the pitch, the amount of saponified tall oil pitch being from 25% to 75% of the weight of said lignin. When the lignin-saponified pitch composite is added to a raw rubber stock in an amount of from 1 part to 50 parts per 100 parts of raw rubber stock the tack is improved.
Claims11
A tackifying composition for rubber comprising an alkali lignin coprecipitated with a saponified tall oil pitch from an alkaline solution of the alkali lignin and the saponified tall oil pitch, the amount of the pitch being from about 25% to about 75% of the weight of the lignin.
A process for preparing a tackifying composition for rubber which comprises:
- (a) slurrying in an alkaline medium an alkali lignin,
- (b) emulsifying a saponified tall oil pitch in an alkaline medium,
- (c) intimately mixing the lignin slurry with the emulsified pitch to produce an emulsion,
- (d) acidifying the emulsion of step (c) with an acidifying agent to form a slurry of coprecipitated lignin-pitch particles, and
- (e) drying the coprecipitated lignin-pitch particles.
Dependencies are inferred from the claim text.