vulcanization accelerator firestone tire rubber of liberia
Vulcanization accelerator - FIRESTONE TIRE & RUBBER CO
' 18. The vulcanized rubber product obtained by heating rubber and sulfur in the presence of a compound possessing the structure 40 1H R-C-S-N-Y where R is a secondary amino group and Y is a 46 cyclohexyl group. 19. The vulcanized rubber product obtained by heating rubber and sulfur in the presence of dimethyl thiocarbarryl cyclohexylamino sulfide. 20.
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Firestone Natural Rubber Company
In 1926, the Liberian government granted Firestone a 99-year lease for a million acres (to be chosen by the company wherever in Liberia) at a price of 6 cents per acre, Firestone then set about establishing rubber tree plantations of the non-native South American rubber tree, Hevea brasiliensis in the country, eventually creating the world's largest rubber plantation.
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Firestone-Natural-Rubber-to-quit-producing-latex-in-Liberia
HARBEL, Liberia—Firestone Natural Rubber Co., a subsidiary of Bridgestone Corp., will cease producing liquid latex at its Liberian plantation in the fourth quarter of 2014 and concentrate solely on the production of block rubber, the company said.
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Introduction - SENS
Vulcanization without the use of an accelerator was commonplace until 1906 when Oenslager found the first useful accelerator (aniline) for use in the process. The unaccelerated process utilized elemental sulfur at 8 parts per 100 parts of rubber (phr) and required a temperature of 140 o C for 5 hours.
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Relations between Vulcanization and Reinforcement | Rubber
3. The peculiar behavior of zinc oxide when added to rubber-sulfur mixes indicates that this material reacts during vulcanization and produces reinforcing effects of a magnitude not to be explained by its particle size and not dependent on the presence of added organic accelerator. 4.
Send Inquiryrubber vulcanization accelerator for tires
LANXESS has developed a new universally suitable vulcanization accelerator for tires and technical rubber goods, that is suitable for all types of rubber. The specialty chemicals company will be showcasing the new high-performance trial product VP Vulkacit TZ for the first time at K 2019, the international trade show for plastics and rubber
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Firestone Tire and Rubber Co Original Assignee Firestone Tire and Rubber Co Priority date (The priority date is an assumption and is not a legal conclusion. Chemical has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) 1941-08-02 Filing date 1941-08-02 Publication date 1943-01-19
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Rubber/accelerator composition - The Firestone Tire
According to the present invention, a curing agent or accelerator for the vulcanization of natural or synthetic rubber is comprised in a novel composition, in effective minor proportion with respect to the mass of rubber being cured, of an accelerator that is an ester of a phosphorodithioic acid (i.e., (HO) 2--P:S--SH), which ester is of the general Formula: ##STR1## wherein R, R' and R" are independently selected from the group consisting of linear, branch-structured and cyclic aliphatic ...
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US2261024A - Vulcanization accelerator
vulcanization accelerator mercaptobenzothiazole rubber vulcanization Prior art date 1939-06-22 Legal status (The legal status is an assumption and is not a legal conclusion. Chemical has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US280444A Inventor Roy ...
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PPT – Firestone Tires PowerPoint presentation | free to
2nd Major Issue in Faulty Firestone Tires; 11 Vulcanization. Process by which rubber is chemically crosslinked (e.g. disulfides) Makes material stronger, elastic, resistant to solvents, and moderate heat/cold. Rubber is heated in the presence of sulfur and accelerator. 12 Properties. Source Mark, James E. Science and Technology of Rubber.
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Vulcanization accelerator - FIRESTONE TIRE & RUBBER CO
' 18. The vulcanized rubber product obtained by heating rubber and sulfur in the presence of a compound possessing the structure 40 1H R-C-S-N-Y where R is a secondary amino group and Y is a 46 cyclohexyl group. 19. The vulcanized rubber product obtained by heating rubber and sulfur in the presence of dimethyl thiocarbarryl cyclohexylamino sulfide. 20.
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Vulcanization
Vulcanization is a chemical process, invented by Charles Goodyear, used to harden rubber. Vulcanization traditionally referred to the treatment of natural rubber with sulfur and this remains the most common example, however the term has also grown to include the hardening of other rubbers via various means. Examples include silicone rubber via room temperature vulcanizing and chloroprene rubber using metal oxides. Vulcanization can therefore be defined as the curing of elastomers; with the terms
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New investigation into Firestone's rubber plantation sheds
The Firestone brand is synonymous with tires. Over the years, much of the rubber used to make those tires has come from Liberia in West Africa. A new documentary, Firestone and the Warlord, a joint investigation by Frontline and ProPublica, tells the story of Firestone's Liberia rubber plantation, especially during Liberia's civil war.
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De-vulcanization of Tire Rubber | ILLYRIA
Vulcanization is the process by which plastic rubber is converted into the elastic rubber or hard rubber state. The process, which is brought about by the linking of macromolecules at their reactive sites, is also known as crosslinking. Vulcanizing agents are substances that bring about the actual crosslinking process.
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US2445724A - Vulcanization accelerator
US2445724A US530392A US53039244A US2445724A US 2445724 A US2445724 A US 2445724A US 530392 A US530392 A US 530392A US 53039244 A US53039244 A US 53039244A US 2445724 A US2445724 A US 2445724A Authority US United States Prior art keywords rubber di disulfide tetrahydrobenzothiazyl accelerator Prior art date 1944-04-10 Legal status (The legal status is an assumption and is not a legal conclusion.
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Firestone-Natural-Rubber-to-quit-producing-latex-in-Liberia
HARBEL, Liberia—Firestone Natural Rubber Co., a subsidiary of Bridgestone Corp., will cease producing liquid latex at its Liberian plantation in the fourth quarter of 2014 and concentrate solely on the production of block rubber, the company said.
Send Inquiry