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AssigneesThe Goodyear Tire & Rubber Company, Danisco US Inc.
InventorsFrank J. Feher, Gregory M. Whited, Gopal K. Chotani, Fernando Valle, Carol Fioresi, Karl J. Sanford, Joseph McAuliffe, Marguerite Cervin, Aaron S. Puhala, Andrei Miasnikov, Ilana S. Aldor
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It has been found that certain cells in culture can convert more than about 0.002 percent of the carbon available in the cell culture medium into isoprene. These cells have a heterologous nucleic acid that (i) encodes an isoprene synthase polypeptide and (ii) is operably linked to a promoter. The isoprene produced in such a cultured medium can then be recovered and polymerized into synthetic rubbers and other useful polymeric materials. The synthetic isoprene containing polymers of this invention offer the benefit of being verifiable as to being derived from non-petrochemical based resources. They can also be analytically distinguished from rubbers that come from natural sources. The present invention more specifically discloses a polyisoprene polymer which is comprised of repeat units that are derived from isoprene monomer, wherein the polyisoprene polymer has δ13C value of greater than −22%.
A polymer which is comprised of repeat units that are derived from isoprene monomer and at least one additional monomer, wherein the polymer includes blocks of repeat units that are derived from isoprene, wherein the blocks of repeat units that are derived from isoprene have a δ13C value of greater than −22%, and wherein the polymer is a copolymer of isoprene and at least one monomer selected from the group consisting of 2,3-dimethyl-1,3-butadiene, piperylene, 3-butyl-1,3-octadiene, 2-phenyl-1.3-butadiene, vinyl chloride, vinyl bromide, vinyl fluoride, vinyl iodide, 1,2-dibromoethene, 1,2-dichloroethene, acrylamide, N-methyl acrylamide, N,N-dimethylacrylamide, vinyl acetate, vinylidene chloride, methyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, vinylpyridine, acrylonitrile, methacrylonitrile, methacrylic acid, itaconic acid and acrylic acid.
A polymer which is comprised of repeat units that are derived from isoprene monomer and at least one additional monomer, wherein the polymer includes blocks of repeat units that are derived from isoprene, wherein the blocks of repeat units that are derived from isoprene have a δ13C value of greater than −22%, and wherein the polymer is a copolymer of isoprene and at least one vinyl aromatic monomer selected from the group consisting of bromostyrene, chlorostyrene, and fluorostyrene.
A polymer which is comprised of repeat units that are derived from isoprene monomer and at least one additional monomer, wherein the polymer includes blocks of repeat units that are derived from isoprene, wherein the blocks of repeat units that are derived from isoprene have a δ13C value of greater than −22%, and wherein the polymer is a copolymer of isoprene and at least one α-olefin monomer selected from the group consisting of ethylene, propylene, and 1-butene.
Dependencies are inferred from the claim text.