US 4,124,546 AGranted

Green strength of elastomers

AssigneeThe Goodyear Tire & Rubber Company

InventorsDiego C. Rubio, Jr., Richard G. Bauer, Richard M. Scriver, Jr.

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Abstract

Improved green strength of elastomers made from monomers selected from the class consisting of at least one conjugated diene having from 4 to 10 carbon atoms, olefins having from 2 to 14 carbon atoms along with a diene having from 4 to 6 carbon atoms, and combinations thereof, is achieved by adding an amount of a polydimethylbutadiene compound to form a blend having a glass transition temperature of from about 0.degree. C to about -100.degree. C. The polydimethylbutadiene compound may be merely the homopolymer of dimetylbutadiene, the copolymer, the terpolymer or the tetrapolymer of dimethylbutadiene in various combinations with monomers such as butadiene, isoprene, piperylene, acrylonitrile, vinylidene chloride, vinyl pyridine, methacrylic acid and vinyl substituted aromatic compounds.

Claims36

Dependent claims

A process for improving the green strength of blends having good green strength of elastomers, comprising:

providing an amount of a dimethylbutadiene compound,
providing an amount of an elastomer,
producing a physical and an uncured blend by mixing said dimethylbutadiene compound and said elastomer,
said elastomer selected from the class consisting of natural rubber and synthetic elastomers,
said synthetic elastomers made from monomers selected from the class consisting of at least one conjugated diene having from 4 to 10 carbon atoms, olefins having from 2 to 15 carbon atoms and a diene having from 4 to 10 carbon atoms;
and combinations thereof,
said blend having a glass transition temperature of from about 0.degree. C. to about -100.degree. C.,
the amount of said dimethylbutadiene compound ranging from about 5 parts to about 80 parts based upon 100 parts of said blend,
said dimethylbutadiene compounds being an elastomer selected from the class consisting of polydimethylbutadiene, copolymers of dimethylbutadiene, terpolymers of dimethylbutadiene, and tetrapolymers of dimethylbutadiene,
said polydimethylbutadiene made from monomers of dimethylbutadiene, said copolymers, said terpolymers and said tetrapolymers of dimethylbutadiene made from monomers selected from the class consisting of dienes having from 4 to 12 carbon atoms, and vinyl substituted aromatic hydrocarbons having from 8 to 12 carbon atoms, and combinations thereof.

7 more elements

A composition of elastomer blends having improved green strength, comprising:

a physical and uncured blend of a dimethylbutadiene compound and an elastomer, the amount of said dimethylbutadiene compound ranging from about 5 parts to about 80 parts per 100 parts of said blend,
said elastomer selected from the class consisting of natural rubber and synthetic elastomers,
said synthetic elastomers made from monomers selected from the class consisting of at least one diene having from 4 to 10 carbon atoms, a diene having from 4 to 10 carbon atoms and an olefin having from 2 to 14 carbon atoms, and combinations thereof to form a blend having a glass transition temperature of from about 0.degree. C. to about -100.degree. C.,
said dimethylbutadiene compound being an elastomer selected from the class consisting of polydimethylbutadiene, copolymers of dimethylbutadiene, terpolymers of dimethylbutadiene, and tetrapolymers of dimethylbutadiene,
said copolymers of dimethylbutadiene, said terpolymers of dimethylbutadiene and said tetrapolymers of dimethylbutadiene made from monomers of dimethylbutadiene and monomes selected from the class consisting of dienes having from 4 to 12 carbon atoms, vinyl substituted aromatic hydrocarbon monomers having from 8 to 12 carbon atoms, and combinations thereof.

2 more elements

Dependencies are inferred from the claim text.