3544 results about "Conjugated diene" patented technology

A process for obtaining a grafted diene elastomer having functional groups along the chain, a rubber composition containing this grafted elastomer and having in particular improved hysteresis properties in the cross-linked state, a preparation process for this composition, a tire tread made from this composition and a tire of reduced rolling resistance which incorporates this tread. A process for obtaining this grafted elastomer includes a radical grafting reaction carried out in solution or without a solvent by means of a reagent of the mercaptan type to graft functional groups on to the chain of a starting elastomer. The starting elastomer is treated with an antioxidant having at least one aromatic amine function before the grafting reaction, so that the grafted elastomer has a macrostructure which is practically identical to that of the starting elastomer. A rubber composition containing the grafted diene elastomer includes a reinforcing inorganic filler, and the grafted elastomer preferably has a molar ratio of units originating from conjugated dienes greater than 30%.

A method for preparing a functionalized polymer comprising the steps of preparing a pseudo-living polymer by polymerizing conjugated diene monomer with a lanthanide-based catalyst, where said pseudo-living polymer is characterized by having greater than about 85 percent of the polymer in the cis microstructure and less than about 3 percent of the polymer is in the 1,2- or 3,4-microstructure, and reacting the pseudo-living polymer with at least one functionalizing agent defined by the formula (I) or (II)

where Z is a substituent that will react or interact with organic or inorganic fillers; R¹ is a single bond or a divalent organic group; R² is a monovalent organic group or a divalent organic group that forms a cyclic organic group with R¹³ or R¹⁴; R³ is a single bond, a divalent organic group, or a trivalent organic group that forms a cyclic organic group with R⁴ or R⁵; R¹³ is a single bond, a divalent organic group, or a trivalent organic group that forms a cyclic organic group with R² or R¹⁴; R⁴ is a monovalent organic group or a divalent organic group that forms a cyclic organic group with R³ or R⁵; R¹⁴ is a monovalent organic group or a divalent organic group that forms a cyclic organic group with R² or R¹³; and R⁵ is a monovalent organic group or a divalent organic group that forms a cyclic organic group with R³ or R⁴; with the proviso that each group attached to the imino carbon is attached via a carbon atom and R¹, R², R³, R⁴, R⁵, R¹³, R¹⁴ and Z are substituents that will not protonate a pseudo-living polymer.

The present invention is a, solid block copolymer comprising at least two polymer end blocks A and at least one polymer interior block B wherein each A block is a polymer block resistant to sulfonation and each B block is a polymer block susceptible to sulfonation, and wherein said A and B blocks do not contain any significant levels of olefinic unsaturation. Preferably, each A block comprising one or more segments selected from polymerized (i) para-substituted styrene monomers, (ii) ethylene, (iii) alpha olefins of 3 to 18 carbon atoms; (iv) hydrogenated 1,3-cyclodiene monomers, (v) hydrogenated monomers of conjugated dienes having a vinyl content less than 35 mol percent prior to hydrogenation, (vi) acrylic esters, (vii) methacrylic esters, and (viii) mixtures thereof; and each B block comprising segments of one or more polymerized vinyl aromatic monomers selected from (i) unsubstituted styrene monomers, (ii) ortho-substituted styrene monomers, (iii) meta-substituted styrene monomers, (iv) alpha-methylstyrene, (v) 1,1-diphenylethylene, (vi) 1,2-diphenylethylene and (vii) mixtures thereof. Also claimed are processes for making such block copolymers, and the various end uses and applications for such block copolymers.

Conjugated diene polymers having good wear resistance, mechanical properties, storage stability, processability and a reduced cold flow are produced by polymerizing a conjugated diene compound with a catalyst of rare earth element compound, a compound containing at least one halogen atom, an aluminoxane, and an organoaluminum compound in an organic solvent and reacting the resulting polymer just after the polymerization with at least one compound selected from the group consisting of a halogenated organometallic compound, a halogenated metal compound, an organometallic compound, a heterocumulene compound, a hetero three-membered-ring containing compound, a halogenated isocyano compound, a carboxylic acid, an acid halide, an ester compound, a carbonic ester compound, an acid anhydride and a metal salt of a carboxylic acid as a modifying agent.

A method for preparing a functionalized polymer, the method comprising the steps of (i) polymerizing conjugated diene monomer by employing a lanthanide-based catalyst to form a reactive polymer, and (ii) reacting the reactive polymer with a nitro compound.

A poly(arylene ether) composition includes a hydrogenated block copolymer of an alkenyl aromatic compound and a conjugated diene, a flame retardant, and a poly(arylene ether)-polysiloxane block copolymer reaction product that itself includes a poly(arylene ether)-polysiloxane block copolymer. The composition is useful for forming extruded articles, including insulation for wire and cable. The poly(arylene ether)-polysiloxane block copolymer contributes improved flame retardancy and, in many cases, improved physical properties to the composition.

The invention is directed to an oil extended rubber and composition comprising: a solution-polymerized elastomer derived from at least one conjugated diene monomer and at least one vinyl aromatic monomer, the elastomer coupled with at least one metal selected from the group consisting of silicon and tin; and from about 5 to about 70 parts by weight, per 100 parts by weight of elastomer (phr), of a process oil having a glass transition temperature of from about −80° C. to about −40° C., a polycyclic aromatic content of less than 3 percent by weight as determined by the IP346 method, and an aromatic content of less than 20 percent by weight as measured by ASTM D2140.

This invention relates to a method for the selective hydrogenation of the unsaturated double bonds in the conjugated diene units of a homopolymer or copolymer in the presence of a novel homogeneous organotitanium-based catalyst. Also, the process of this invention can demonstrate a high yield of hydrogenation and hydrogenation reproducibility using a novel catalyst, so prepared from a mixture consisting of a substituted or unsubstituted monocyclopentadienyl titanium compound expressed by the following formula 1 and lithium hydride derived from a reaction of both alkyl lithium and hydrogen in solution. In particular, this invention also relates to a novel method for the selective hydrogenation of unsaturated double bonds in the conjugated diene units of a conjugated diene polymer or copolymer, so prepared via the reaction between a conjugated diene monomer and vinyl-substituted aromatic monomerwherein, R1, R2, R3, R4 and R5, which may be same or different, are selected from hydrogen atoms and alkyl groups of 1~5 carbon atoms; X1, X2 and X3, which may be same or different, are selected from halogen atoms.

There is provided a process for producing a modified diene polymer rubber comprising the steps of: (1) polymerizing a conjugated diene monomer or a combination thereof with an aromatic vinyl monomer in a hydrocarbon solvent, in the presence of an alkali metal catalyst, to form an alkali metal end-carrying active polymer, and (2) reacting the alkali metal end-carrying active polymer with a silane compound defined by a specific formula.

A cement composition includes cement, water in an amount from about 30% to 200% by weight of cement, and an interpolymer latex in an amount from about 10% to 50% by weight of cement. The interpolymer latex includes at least one conjugated diene monomer having 4 to 8 carbon atoms in an amount from about 5% to 95% by weight of the interpolymer latex, at least one vinyl aromatic monomer having 8 to 12 carbon atoms in an amount from about 5% to 95% by weight of the interpolymer latex, and a copolymerizable functional monomer in an amount from about 0.5% to 50% by weight of the interpolymer latex. A method of making a cement composition involves placing the above ingredients in a suitable mixer well known to those of ordinary skill in the art and mixing the ingredients until they form the cement composition. A method for cementing a subterranean zone penetrated by a wellbore involves forming a cement composition according to the above method, pumping the cement composition into the subterranean zone to be cemented by way of the wellbore, and allowing the cement composition to set within the subterranean zone.

An elastomeric composition for forming a golf ball or a component thereof is disclosed that includes the use of a non-conjugated diene monomer having two or more vinyl (CH₂═CH—) terminal end groups. The composition produces a molded product exhibiting an enhanced combination of increased compression (i.e., softness) and resilience (C.O.R.).

Unsaturated copolymer which is a copolymer of an alphaolefin of 2 to 12 carbon atoms and a conjugated diene monomer represented by the following formula (I-a) and has the properties: (a) in said copolymer, 1,2-addition units (including 3,4-addition units) derived from the conjugated diene monomer (I-a) form double bonds in the side chain of the copolymer, 1,4-addition units derived from the conjugated diene monomer (I-a) form double bonds in the main chain of the copolymer, and the quantity ratio of the double bonds of the side chain derived from the 1,2-addition units to the double bonds of the main chain derived from the 1,4-addition units (side chain double bonds derived from 1,2-addition units/main chain double bonds derived from 1,4-addition units) is in the range of 10/90 to 99/1 (b) five-membered rings are present in the main chain of said copolymer; and (c) the quantity ratio of the double bonds from all of the addition units to the five-membered rings (total of double bonds from all addition units/five-membered rings) is in the range of 20/80 to 90/10;wherein R2 is a hydrogen atom, an alkyl group of 1 to 8 carbon atoms or an aryl group.

A conjugated diene polymer is provided that comprises a conjugated diene-based constituent unit and a constituent unit of formula (I) below, at least one terminus of the polymer being modified by a compound of formula (II):

wherein X¹, X², and X³ independently denote a group of formula (Ia) below, a hydroxy group, a hydrocarbyl group, or a substituted hydrocarbyl group, and at least one of X¹, X², and X³ is a group of formula (Ia) below or a hydroxy group,

wherein R¹ and R² independently denote a hydrocarbyl group having 1 to 6 carbon atoms, a substituted hydrocarbyl group having 1 to 6 carbon atoms, a silyl group, or a substituted silyl group, and R¹ and R² may be bonded so as to form, together with the nitrogen atom, a ring structure,

wherein n denotes an integer of 1 to 10, R³, R⁴, and R⁵ independently denote a hydrocarbyl group having 1 to 4 carbon atoms or a hydrocarbyloxy group having 1 to 4 carbon atoms, at least one of R³, R⁴, and R⁵ is a hydrocarbyloxy group, and A denotes a nitrogen atom-containing functional group.

A conjugated diene polymer is provided that comprises a conjugated diene-based constituent unit and a constituent unit of formula (I) below, at least one terminus of the polymer being modified by a compound of formula (II):

We disclose a monovinylarene/conjugated diene block copolymer, comprising: (i) a random (conjugated diene_x/monovinylarene_y)_m block, wherein x is about 2.5 wt % to about 10 wt %, y is from about 90 wt % to about 97.5 wt %, and x+y is about 97.5 wt % to 100 wt %; and (ii) a (conjugated diene)_n block; wherein n is from about 20 wt % to about 30 wt %, m is from about 70 wt % to about 80 wt %, and m+n is from about 90 wt % to 100 wt %. We also disclose a method of forming the block copolymer and a method for fabricating an article from the block copolymer. The block copolymer typically exhibits a T_g at least about 10° C. less than the T_g of a reference polymer differing only in that x is about 0 wt % and y is about 100 wt %.

A conjugated diene polymer is provided that comprises a conjugated diene-based constituent unit and a constituent unit of formula (I), at least one terminus of the polymer being modified by a compound having a linkage of formula (II):

wherein X¹, X², and X³ independently denote a group as defined in the specification.

wherein p denotes 0 or 1, T denotes a group as defined in the specification.