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| Number | Title | Issue Date |
| 7417103 | Isotactic 3,4-isoprene-based polymer The present invention provides 3,4-isoprene-based polymer with high regioregularity, in particular high tacticity. Specifically, the present invention provides an isoprene-based polymer, including a structural unit represented by Formula (I) in Claims, wherei... | 08/26/2008 |
| 7288612 | Initiator composition and method for anionic polymerisation The invention relates to an initiator composition for anionic polymerization, comprising at least one alkali metal hydride selected from LiH, NaH, and KH, and at least one organylaluminum compound, and to a process for the anionic polymerization of styrene monomers ... | 10/30/2007 |
| 7220798 | Process for preparing block copolymer and resulting composition Lithium-terminated polymers of one or more conjugated dienes and of one or more mono alkenyl arenes are coupled by reaction with an alkoxy silane coupling agent having the formula Rx—Si—(OR′)y, where x is 0 or 1, x+y=4, R and R′ are the... | 05/22/2007 |
| 7205360 | Preparation process for block copolymers for tire tread compositions, and such copolymers A preparation process for a copolymer having two blocks usable in a sulphur-cross-linkable rubber composition of reduced hysteresis in the cross-linked state, such a block copolymer in which one of the blocks is a polyisoprene and the other a diene elastomer other t... | 04/17/2007 |
| 7157533 | Process of obtaining an isoprene-enriched FCC C5 fraction and selective polymerization of isoprene from said fraction A process is described for obtaining from an “FCC” initial C5 fraction which is enriched with isoprene and purified and usable for the selective polymerization of isoprene. A process is also described for obtaining an isoprene homopolymer from a polymerization m... | 01/02/2007 |
| 7048023 | Pneumatic tire having a component containing high trans styrene-butadiene rubber The invention is directed to a pneumatic tire having at least one component comprising a vulcanizable rubber composition, wherein the vulcanizable rubber composition comprises, based on 100 parts by weight of elastomer (phr), from about 30 to 100 phr of high trans r... | 05/23/2006 |
| 6992157 | Synthetic polyisoprenes and a process for their preparation The present invention provides synthetic polyisoprenes having a high cis-1,4 linkage content and a process for their preparation. The synthetic polyisoprenes according to the invention have a cis-1,4 linkage content, measured by carbon-13 nuclear magnetic resonance ... | 01/31/2006 |
| 6858686 | Process for obtaining a polyisoprene with a high cis-1,4 linkage content The present invention relates to a process for obtaining a polyisoprene having a high cis-1,4 linkage content, from a steam-cracked C5 naphtha fraction enriched with isoprene. The process of the present invention comprises reacting a steam-cracked C5 naphtha fractio... | 02/22/2005 |
| 6838534 | Catalytic system and process for the preparation of elastomers by means of this system The present invention provides a catalytic system that can be used to prepare by polymerization diene elastomers comprising polyisoprenes and polybutadienes. The invention also provides a process for the preparation of the catalytic system and to a process using the... | 01/04/2005 |
| 6770723 | α-olefin/conjugated diene copolymers The invention provides olefin polymerization catalyst exhibiting excellent polymerization activities, a process for olefin polymerization using the catalyst, a novel transition metal compound useful for the catalyst, and an α-olefin/conjugated diene copolymer havin... | 08/03/2004 |
| 6758251 | Pneumatic tire having a component containing high trans styrene-butadiene rubber The invention is directed to a pneumatic tire having at least one component comprising a vulcanizable rubber composition, wherein the vulcanizable rubber composition comprises, based on 100 parts by weight of elastomer (phr), from about 30 to 100 phr of high trans r... | 07/06/2004 |
| 6699955 | Copolymerization of ethylene and dienes Ethylene, dienes and optionally -olefins are copolym-erized by selected iron complexes of 2,6-pyridinecarbox-aldehydebis(imines) and 2,6-diacylpyridinebis(imines). The resulting copolymers contain residual olefinic unsaturation from the diene monom... | 03/02/2004 |
| 6670437 | Rubber composition stabilized with carnosic acid This invention discloses a chewing gum rubber composition (gum base) that utilizes carnosic acid from a Libiatae plant, such as rosemary or sage, as an antioxidant stabilizer. This invention more specifically discloses a chewing gum base comprising: (1) a... | 12/30/2003 |
| 6667368 | Amino acid functionalized polymers for graft copolymerizations Amino acid functionalized polymers useful for graft copolymerization prepared by reacting a mixture containing, for chain transfer, a thio-substituted amino acid and an ethylenically unsaturated monomer.... | 12/23/2003 |
| 6627715 | Group IIa metal containing catalyst system The group IIa metal containing catalyst system of this invention can be utilized to synthesize rubbery polymers having a high trans microstructure by solution polymerization. Such rubbery polymers having a high trans microstructure content, such as polybu... | 09/30/2003 |
| 6602967 | Use of deaminatively-generated carbocation as polymerization initiators Deaminatively generated carbocations to initiate addition polymerization are disclosed. The high reactivity of the carbocation allows initiation of polymerization with virtually all alkenes, alkynes, alicyclic and aromatic monomers, regardless whether mul... | 08/05/2003 |
| 6566478 | Synthesis of high vinyl rubber This invention is based upon the discovery that rubbery polymers having a high vinyl content and a low degree of branching can be synthesized with an initiator system that is comprised of (a) a lithium initiator selected from the group consisting of allyl... | 05/20/2003 |
| 6518379 | Method of producing rubber compositions in styrene solutions with sterically superior chelate catalysts In a process for polymerizing dienes in a solvent comprising vinylaromatic monomers, the polymerization is carried out in the presence of a metal compound of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo or W as catalyst and a Lewis acid as cocatalyst and, if desired, an... | 02/11/2003 |
| 6482930 | Monomeric neodymium carboxylate and its use in polymerization of conjugated diene The invention is related to a novel compound represented by NdHA4 wherein A is a carboxylate, and to a diene polymerization catalyst using the novel compound. NdHA4 has monomeric structure and does not contain water, bases and salts.... | 11/19/2002 |
| 6476171 | Easy processing linear low density polyethylene A polymer of ethylene and at least one alpha olefin having at least 5, carbon atoms obtainable by a continuous gas phase polymerization using supported catalyst of an activated molecularly discrete catalyst such as a metallocene in the substantial absence... | 11/05/2002 |
| 6391997 | Method for producing diene-based rubber polymer latex A process for production of diene rubber polymers wherein, during production of a diene rubber polymer by emulsion polymerization, the polymerization is initiated using a portion of the starting material and the polymerization is continued with either con... | 05/21/2002 |
| 6384164 | Process for the preparation of a branched diene elastomer via an anionic route The present invention provides a process for preparing a branched diene elastomer having a high proporation of starred chains comprising anionically polymerizing at least one conjugated diene monomer having 4 to 12 carbons in a polymerization medium compr... | 05/07/2002 |
| 6365694 | Amorphous vinyl cyclohexane polymers Amorphous polymers, including homopolymers and co-polymers, containing residues of vinyl cyclohexane and/or substituted vinyl cyclohexane are described. The polymers of the present invention have a syndiotactic configuration in which the quantity of diads... | 04/02/2002 |
| 6313239 | Olefin polymerization with group 4 metal-containing organosilicon dendrimers Group 4 metal-containing organosilicon dendrimers are described. Also described are methods for synthesizing the dendrimers. The dendrimers can be useful in several applications including as olefin polymerization and copolymerization catalysts and as sila... | 11/06/2001 |
| 6310154 | Solid acids as catalysts for the preparation of hydrocarbon resins Solid acids are used as catalysts for the polymerization of a feed stream containing at least one of pure monomer, C5 monomers, and C9 monomers to produce hydrocarbon resins. Freely-associated water may be removed from the solid acid catalyst prior to use... | 10/30/2001 |
| 6288191 | Ethylene-isoprene random copolymer The present invention relates to an ethylene-isoprene random copolymer having an isoprene content of about 1 to 45% by mole, or an ethylene-isoprene copolymer having a Q-value of about 3.5 or less, wherein the Q-value is a ratio of weight average molecula... | 09/11/2001 |
| 6280713 | Nail varnish containing microgels The invention relates to novel microgel-containing essentially organic solvent nail varnishes. The microgels are particularly acrylic microgels. The invention also relates to the use of these microgels for modifying the physical properties of an essentially or... | 08/28/2001 |
| 6281309 | Flourinated solid acids as catalysts for the preparation of hydrocarbon resins Fluorinated solid acids and supported fluorinated solid acids are used as catalysts for the polymerization of a feed stream containing at least one of pure monomer, C5 monomers, and C9 monomers to produce hydrocarbon resins. Freely-associated water may be... | 08/28/2001 |
| 6255426 | Easy processing linear low density polyethylene A polymer of ethylene and at least one alpha olefin having at least 5, carbon atoms obtainable by a continuous gas phase polymerization using supported catalyst of an activated molecularly discrete catalyst such as a metallocene in the substantial absence... | 07/03/2001 |
| 6242553 | Rubber stabilized with carnosic acid Styrene butadiene rubber (SBR) is widely used as a chewing gum base in lieu of natural gums. It is necessary to protect chewing gum SBR with a food grade antioxidant stabilizer system. This invention discloses a chewing gum rubber composition (gum base) t... | 06/05/2001 |
| 6077874 | Process for improving the properties of ground recycled rubber A process involving (a) homogeneously dispersing tris(2-aminoethyl) amine in a recycled rubber having an individual particle size no greater than 420 microns, (b) mixing the treated recycled rubber with unvulcanized rubber and (c) vulcanizing the rubber m... | 06/20/2000 |
| 6066705 | Vapor phase synthesis of cis-1, 4-Polyisoprene By utilizing the vapor phase polymerization techniques of the present invention, numerous distinct and highly beneficial advantages are realized. For instance, cis-1,4-polyisoprene rubber and high cis-1,4-polybutadiene rubber having a consistent and contr... | 05/23/2000 |
| 6025451 | Method of producing particulate natural rubber A method of producing a particulate natural rubber, which comprises adding an inorganic salt to a serum obtained by centrifugal separation of a natural rubber latex in the amount enough to cause separation of a particulate natural rubber component in the ... | 02/15/2000 |
| 5958820 | Gas-phase polymerisation of conjugated dienes in the presence of rare earth allyl compounds A process for polymerizing a gaseous conjugated diene by bringing it in contact with a catalyst consisting of a rare earth allyl compound, an organic aluminum compound, an inorganic support and optionally, the same or a different conjugated diene. The res... | 09/28/1999 |
| 5919876 | Synthesis of cis-1,4-polyisoprene rubber The synthesis of cis-1,4-polyisoprene by polymerizing isoprene with a catalyst system which is comprised of a titanium tetrahalide, a trialkylaluminum compound and diphenylether is plagued with the formation of gel. This invention is based upon the unexpe... | 07/06/1999 |
| 5914378 | Anionic copolymerization of conjugated dienes and vinyl arenes in the presence of alkyl ethers of tetrahydropyranyl methanol Process for the preparation of a polymer by the polymerization of: (A) from 50 to 100 percent by weight of at least one diene monomer, (B) from 0 to 50 percent by weight of at least one ethylenically unsaturated monomer, the above polymerization being carried out i... | 06/22/1999 |
| 5859156 | Vapor phase synthesis of rubbery polymers By utilizing the vapor phase polymerization techniques of the present invention, numerous distinct and highly beneficial advantages are realized. For instance, cis-1,4-polyisoprene rubber and high cis-1,4-polybutadiene rubber having a consistent and contr... | 01/12/1999 |
| 5708092 | Functionalized chain extended initiators for anionic polymerization A process for the preparation of hydrocarbon solutions of monofunctional ether initiators of the following general structure: M--Qn --Z--OA(R1 R2 R3) wherein M is defined as an alkali metal, selected from the group consis... | 01/13/1998 |
| 5677402 | Process for preparing 3,4-polyisoprene rubber This invention reveals an initiator system which is comprised of (a) a lithium initiator, (b) a sodium alkoxide and (c) a polar modifier; wherein the molar ratio of the sodium alkoxide to the lithium initiator is within the range of about 0.05:1 to about ... | 10/14/1997 |
| 5652304 | Vapor phase synthesis of rubbery polymers By utilizing the vapor phase polymerization techniques of the present invention, numerous distinct and highly beneficial advantages are realized. For instance, cis-1,4-polyisoprene rubber and high cis-1,4-polybutadiene rubber having a consistent and contr... | 07/29/1997 |
