Molded composition and article molded therefrom

Claim 2

A vulcanizing molding composition processable into a solid rubber tire, said composition consisting essentially of: a. a previously vulcanized non-devulcanized hydrocarbon rubber polymer in an amount ranging from about 94% to about 99% by weight of the total composition; b. a vulcanizing agent in an amount ranging from about 1 to about 4% by weight of the total composition; and c. an accelerator comprising a mixture of at least two compounds present in an amount of from about 0.13% to about 2% by weight of the total composition, said at least two compounds being selected from the group consisting of quanidines, thiazoles, dithiocarbamates and thiurams.

Claim 3

A vulcanizing molding composition processable into a solid rubber tire, said composition consisting essentially of: a. a previously vulcanized non-devulcanized hydrocarbon rubber polymer in an amount ranging from about 92 to about 98% by weight of the total composition; b. a vulcanizing agent in an amount ranging from about 1 to about 4% by weight of the total composition; c. an accelerator comprising a mixture of at least two compounds present in an amount of from about 0.13 to about 2% by weight of the total composition, said at least two compounds being selected from the group consisting of quanidines, thiazoles, dithiocarbamates and thiurams; and d. a virgin hydrocarbon rubber polymer in an amount up to about 5% by weight of the total composition.

Claim 4

A vulcanizing molding composition processable into a solid rubber tire, said composition consisting essentially of: a. a previously vulcanized non-devulcanized hydrocarbon rubber polymer in an amount ranging from about 92 to about 98% by weight of the total composition; b. a vulcanizing agent in an amount ranging from about 1 to about 4% by weight of the total composition; c. an accelerator comprising a mixture of at least two compounds present in an amount of from about 0.13 to about 2% by weight of the total composition, said at least two compounds being selected from the group consisting of quanidines, thiazoles, dithiocarbamates and thiurams; and d. a virgin hydrocarbon rubber polymer in an amount up to about 5% by weight of the total composition.

Claim 5

The composition of claim 1 wherein said previously vulcanized hydrocarbon rubber polymer comprises scrap rubber.

Claim 6

The composition of claim 3 wherein said scrap rubber is ground to a particle size of about 20 mesh.

Claim 7

The composition of claim 1 wherein said vulcanizing agent comprises sulfur.

Claim 8

The composition of claim 5 wherein said accelerator consists of a mixture of dibenzthiazole disulfide and tetramethyl thiuram monosulfide.

Claim 9

The composition of claim 6 wherein said dibenzthiazole is present in amounts between about 0.1 and about 0.5% and tetramethyl thiuram monosulfide is present in amounts between about 0.03 and about 0.05%.

Claim 10

The composition of claim 1 wherein said composition comprises a previously vulcanized hydrocarbon rubber polymer in an amount ranging from between about 96 to about 99% by weight of the total composition.

Claim 11

The composition of claim 2 wherein said virgin hydrocarbon rubber polymer comprises between about 1 and about 5% by weight of the total composition.

Claim 12

The composition of claim 9 wherein said virgin hydrocarbon rubber polymer comprises rubber latex.

Claim 13

The composition of claim 8 wherein said previously vulcanized hydrocarbon rubber polymer comprises from about 98 to about 99% by weight of the total composition, said vulcanizing agent comprises sulfur in a range from about 1 to about 2% by weight of the total composition and said accelerator comprises a mixture of dibenzthiazole disulfide and tetramethyl thiuram monosulfide wherein said dibenzthiazole disulfide ranges from about 0.19 to about 0.3% by weight of the total composition and said tetramethyl thiuram monosulfide ranges from about 0.03 to about 0.05% by weight of the total composition.

Claim 14

The composition of claim 10 wherein said previously vulcanized hydrocarbon rubber polymer comprises from about 95 to about 96% by weight of the total composition, said accelerator comprises a mixture of dibenzthiazole disulfide and tetramethyl thiuram monosulfide, wherein said dibenzthiazole disulfide ranges from about 0.19 to about 0.3% by weight of the total composition and said tetramethyl thiuram monosulfide ranges from about 0.03 to about 0.05% by weight of the total composition and said rubber latex ranges from about 1 to about 3% by weight of the total composition.

Claim 15

A process for producing a molded vulcanized rubber composition, particularly adaptable for use as a solid rubber tire, said process comprising: a. combining a mixture consisting essentially of of: (i) from about 94 to about 99% by weight of the total composition of a previously vulcanized non-devulcanized hydrocarbon rubber polymer; (ii) from about 1 to about 4% by weight of the total composition of a vulcanizing agent; (iii) from about 0.19 to 0.03% by weight of the total composition of a dibenzthiazole disulfide accelerator and from 0.03 to about 0.05% by weight of the total composition of a tetramethyl thiuram monosulfide accelerator; b. dry mixing said composition in such a manner that its constituent parts become uniformly dispersed; c. drying said composition; introducing said composition into a vulcanizing mold and thereafter vulcanizing said composition.

Claim 16

A process for producing a molded vulcanized rubber composition, particularly adaptable for use as a solid rubber tire, said process comprising: a. combining a mixture consisting essentially of of: (i) from about 94 to about 99% by weight of the total composition of a previously vulcanized non-devulcanized hydrocarbon rubber polymer; (ii) from about 1 to about 4% by weight of the total composition of a vulcanizing agent; (iii) from about 0.19 to 0.03% by weight of the total composition of a dibenzthiazole disulfide accelerator and from 0.03 to about 0.05% by weight of the total composition of a tetramethyl thiuram monosulfide accelerator; b. dry mixing said composition in such a manner that its constituent parts become uniformly dispersed; c. drying said composition; introducing said composition into a vulcanizing mold and thereafter vulcanizing said composition.

Claim 17

A process for producing a molded vulcanized rubber composition, particularly adaptable for use as a solid rubber tire, said process consisting essentially of a. combining a mixture of: (i) from about 92 to about 99% by weight of the total composition of a previously vulcanized hydrocarbon rubber polymer; (ii) from about 1 to about 4% by weight of the total composition of a vulcanizing agent; (iii) from about 0.19 to 0.03% by weight of the total composition of a dibenzthiazole disulfide accelerator and from 0.03 to about 0.05% by weight of the total composition of a tetramethyl thiuram monosulfide accelerator; b. dry mixing said composition in such a manner that its constituent parts become uniformly dispersed; c. drying said composition; d. introducing said composition into a vulcanizing mold and thereafter vulcanizing said composition; and e. combining in said mixture a virgin hydrocarbon rubber polymer in an amount of up to about 5% by weight of the total composition.

Claim 18

A process for producing a molded vulcanized rubber composition, particularly adaptable for use as a solid rubber tire, said process consisting essentially of a. combining a mixture of: (i) from about 92 to about 99% by weight of the total composition of a previously vulcanized hydrocarbon rubber polymer; (ii) from about 1 to about 4% by weight of the total composition of a vulcanizing agent; (iii) from about 0.19 to 0.03% by weight of the total composition of a dibenzthiazole disulfide accelerator and from 0.03 to about 0.05% by weight of the total composition of a tetramethyl thiuram monosulfide accelerator; b. dry mixing said composition in such a manner that its constituent parts become uniformly dispersed; c. drying said composition; d. introducing said composition into a vulcanizing mold and thereafter vulcanizing said composition; and e. combining in said mixture a virgin hydrocarbon rubber polymer in an amount of up to about 5% by weight of the total composition.

Claim 19

The process of claim 13 wherein said composition is dried in such a manner that the temperature of said composition does not exceed about 220° F.

Claim 20

The process of claim 13 wherein said composition is vulcanized at a temperature between about 310° F and about 410° F, at a pressure above about 1000 pounds per square inch and for a period of time sufficient to vulcanize said composition.

Claim 21

The process of claim 13 wherein said composition is dry mixed in a ribbon-type dry mixer.

Claim 22

The process of claim 13 wherein the said composition is dried in a forced air vibratory.

Claim 23

The process of claim 13 wherein the vulcanizing mold employs hydraulic means to generate pressure.

Claim 24

The process of claim 13 wherein said process comprises: a. combining a mixture consisting essentially of of: (i) from about 98 to about 99% by weight of the total composition of a previously vulcanized hydrocarbon rubber polymer which comprises scrap rubber ground to about 20 mesh; (ii) from about 1 to about 2% by weight of the total composition of a vulcanizing agent which comprises sulfur; (iii) from about 0.19 to 0.03% by weight of the total composition of a dibenzthiazole disulfide accelerator and from 0.03 to about 0.05% by weight of the total composition of a tetramethyl thiuram monosulfide accelerator; b. dry mixing said composition in a forced air vibratory in such a manner that the temperature of the composition does not exceed about 220° F; c. introducing said composition into a vulcanizing mold and thereafter vulcanizing said composition at a temperature of about 350° F, at a pressure between about 1500 pounds per square inch and about 4000 pounds per square inch and for a period of time between about 5 minutes and about 20 minutes.

Claim 25

The vulcanized molded article of claim 20.

Claim 26

The vulcanized molded article of claim 21 wherein said article has a tensile strength greater than about 600 pounds per square inch and an elongation greater than about 150%.

Claim 27

The process of claim 13 wherein said process comprises: a. combining a mixture consisting essentially of of (i) from about 95 to about 96% by weight of the total composition of a previously vulcanized hydrocarbon rubber polymer which comprises scrap rubber ground to about 20 mesh; (ii) from about 1 to about 2% by weight of the total composition of a vulcanizing agent which comprises sulfur; (iii) an accelerator which comprises from between about 0.19 to about 0.3% by weight of the total composition dibenzthiazole disulfide and from about 0.03 to about 0.05% by weight of the total composition of tetramethyl thiuram monosulfide; (iv) from about 1.0 to about 3.0% by weight of the total composition of a virgin hydrocarbon rubber polymer which comprises rubber latex; b. dry mixing said composition in a forced air vibratory in such a manner that the temperature of the composition does not exceed about 220° F; c. introducing said composition into a vulcanizing mold and thereafter vulcanizing said composition at a temperature of about 350° F, at a pressure between about 1500 pounds per square inch and about 4000 pounds per square inch and for a period of time between about 5 minutes and about 20 minutes.

Claim 28

The vulcanized molded article of claim 23.

Claim 29

The vulcanized molded article of claim 24 wherein said article has a tensile strength greater than about 600 pounds per square inch and an elongation greater than about 150%.