Friable rubber bales
AssigneeThe B. F. Goodrich Company
InventorsAugust H. Jorgensen, Jr., Martin E. Woods
Life of this patent
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Abstract
Particulate rubber is intimately and uniformly coated with an anti-cake(s) and pressed at mild temperatures to form friable rubber bales. The bales have a bulk density from about 1.3 to about two times that of the original particulate rubber and are capable of being handled as a slab and of supporting a direct load, yet break down under shear to form particles substantially similar in size and distribution to that of the original particulate rubber.
Claims16
A friable bale of rubber comprising discrete particles of particulate rubber wherein a majority of the discrete rubber particles have therebetween a layer of at least one anti-cake material selected from the group consisting of inorganic dusting agents, metal salts of organic acids, and hard resins having a glass transition temperature above 40.degree. C.;
- wherein said anti-cake is used at a level of from about 0.5 to about 20 parts by weight per 100 parts by weight of said particulate rubber;
- and wherein the bulk density of said friable bale is from about 1.3 to about two times the bulk density of the particulate rubber;
- and said increase in bulk density is achieved by molding the particulate rubber into a bale at a pressure of from about 20 psig to about 1000 psig and at a temperature of from about 25.degree. C. to about 100.degree. C. and a time under compression of from about 10 seconds to about 10 minutes.
A method of producing a friable bale of rubber comprising (a) coating discrete particles of particulate rubber with a layer of at least one anti-cake material selected from the group consisting of inorganic dusting agents, metal salts of organic acids, and hard resins having a glass transition temperature above 40.degree. C.;
- wherein said anti-cake is used at a level of from about 0.5 to about 20 parts by weight per 100 parts by weight of said particulate rubber;
- (b) compressing said particulate rubber to a bulk density of from about 1.3 to about two times the bulk density of the uncompressed particulate rubber, said compressing being conducted at a pressure of from about 20 psig to about 1000 psig and at a temperature of from about 25.degree. C. to about 100.degree. C. and for a time of from about 10 seconds to about 10 minutes.
Dependencies are inferred from the claim text.