Method of dispersing carbon black in liquid elastomers
AssigneeThe Firestone Tire & Rubber Company
InventorsWilliam W. Barbin, Joseph C. Sanda, Jr.
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Abstract
A low shear method of adequately dispersing carbon black in liquid elastomers by adding the liquid elastomers to a container, adding from 30 parts to about 160 parts by weight per 100 parts of liquid elastomer of an oil beaded carbon black containing from 5 to about 60 parts of oil and from 25 to about 100 parts of carbon black and mixing the compounds to produce a relatively low viscosity carbon black dispersed elastomeric composition.
Claims39
A low shear method of adequately dispersing carbon black in liquid elastomers comprising the steps of:
- adding to a container a liquid elastomer,
- an amount of from 5 to about 60 parts by weight of a hydrocarbon oil,
- adding to said container from 30 to about 60 parts by weight based on 100 parts of said liquid elastomer of an oil beaded carbon black containing from 25 to about 100 parts by weight of carbon black and containing said entire amount from 5 parts to about 60 parts by weight of said hydrocarbon oil so that said entire amount of hydrocarbon oil is added in the form of an oil beaded carbon black,
- mixing said compounds to produce a low viscosity, carbon black dispersed elastomeric composition,
- and mixing said compounds in a lower shear mixer.
A low shear method of adequately producing a cured elastomer article comprising the steps of:
- adding to a low shear mixer a liquid elastomer selected from the group consisting of polybutadiene, a polybutadiene-styrene, polyisoprene, polychloroprene, copolymers of polybutadiene and acrylonitrile and polypropylene glycol, said liquid elastomers terminated by two or more hydroxyl groups, from 5 to about 60 parts of a hydrocarbon oil by weight, adding from 30 to 160 parts of an oil beaded carbon black containing from 25 to about 100 parts by weight of carbon black and containing said entire amount of said 5 to 60 parts of said hydrocarbon oil to said mixer so that said entire amount of hydrocarbon oil is added in the form of an oil beaded carbon black, mixing said compounds to disperse said carbon black, adding an equivalent excess based upon said hydroxyl groups of a diisocyanate curing agent having the formula R(N=C=X).sub.2 where R is an aliphatic group containing from 5 to about 20 carbon atoms or an aromatic group containing from 6 to about 20 carbon atoms and X is oxygen or sulfur, said amount being from about 1.0 to about 3.0 equivalent of said diisocyanate, mixing said diisocyanate curing compound in said dispersed carbon black-oil liquid elastomer, forming an article and curing to produce a cured solid elastomer article.
A low shear method of adequately dispersing carbon black in liquid elastomers comprising the steps of:
- adding to a container a liquid elastomer,
- adding to said container from 30 to about 125 parts by weight based on 100 parts of said liquid elastomer of an oil beaded carbon black containing from 25 to about 100 parts by weight of carbon black and containing from 5 to about 25 parts by weight of a hydrocarbon oil,
- adding separately from 0 to about 35 parts by weight of a hydrocarbon oil,
- mixing said compounds to produce a low viscosity, carbon black dispered elastomeric composition,
- and mixing said compounds in a low shear mixer.
A low shear method of adequately producing a cure elastomer article comprising the steps of:
- adding to a low shear mixer a liquid elastomer selected from the group consiting of polybutadiene, polybutadiene-styrene, polyisoprene, polychloroprene, copolymers of polybutadiene and acrylonitrile or polypropylene glycol, said liquid elastomers terminated by 2 or more hydroxyl groups, adding from 30 to about 125 parts by weight based on 100 parts of said liquid elastomer of an oil beaded carbon black containing from 25 to about 100 parts by weight of carbon black and containing from 5 to about 25 parts by weight of a hydrocarbon oil, adding separately from 0 to about 35 parts of a hydrocarbon oil, mixing said compounds to disperse said carbon black, adding an equivalent excess based upon said hydroxyl groups of a diisocyanate curing agent having the formula R(N=C=X).sub.2 where R is an aliphatic group containing from 5 to about 20 carbon atoms or an aromatic group containing from 60 to about 20 carbon atoms and X is an oxygen or sulfur, said amount being from about 1.0 to about 3.0 equivalence of said diisocyanate, mixing said diisocyanate curing compound in said liquid elastomer, forming an article and curing to produce a cured solid elastomer article.
Dependencies are inferred from the claim text.