11 results about "Conjugated diene" patented technology

A conjugated diene polymer is provided that contains a conjugated diene-based monomer unit and a group represented by Formula (I) below, at least peaks H, M, and L below being present in a molecular weight distribution curve obtained by gel permeation chromatography measurement, and when the total area of the molecular weight distribution curve is 100%, the total peak area of peak H is 3% to 30%, the total peak area of peak M is 5% to 45%, and the total peak area of peak L is 40% to 80%

(in Formula (I), R¹ and R² independently denote a hydrocarbon group having 1 to 4 carbon atoms, a hydrocarbonoxy group having 1 to 4 carbon atoms, a hydroxy group, or a polymer chain containing a conjugated diene-based monomer unit, m denotes an integer of 0 to 10, and A¹ denotes a polar functional group that does not have an active hydrogen)

Peak H: a peak for which the molecular weight at the peak top is higher than the molecular weight at the peak top of peak M

Peak M: a peak for which, when the molecular weight at the peak top of peak H is MH, the molecular weight at the peak top is 0.6×MH to 0.8×MH

Peak L: a peak for which, when the molecular weight at the peak top of peak H is MH, the molecular weight at the peak top is 0.2×MH to 0.4×MH.

This invention relates to a novel polymerization initiator capable of introducing an active amino proton into a polymerization starting terminal without losing polymerization activity, and a novel modified conjugated diene polymer being excellent in the interaction with a filler and capable of improving a low heat buildup of a rubber composition, and more particularly to a polymerization initiator being a diamine compound in which one amino group is protected with a silylating agent and an active proton of the other amino group is replaced with an alkali metal or an alkaline earth metal, and a modified conjugated diene polymer which can be produced by using such a polymerization initiator and is a homopolymer of a conjugated diene compound or a copolymer of a conjugated diene compound and an aromatic vinyl compound and has a residue derived from a diamine compound at its polymerization starting terminal.

The present invention relates to an aqueous reinforced rubber dispersion comprising: a) 51 to 90 wt-% of base latex polymer particles; and b) 10 to 49 wt-% of reinforcing latex polymer particles comprising structural units of aromatic vinyl monomers and conjugated diene monomers, the reinforcing latex polymer particles having a single glass transition temperature (Tg) from −25° C. to 28° C. as measured by differential scanning calorimetry (DSC), whereby the weight percentages are based on the total weight of polymer particles in the rubber dispersion and the base latex polymer particles have a Tg as measured by DSC that is lower than the Tg of the reinforcing latex particles, to the use of the rubber dispersion for making latex foam, to a method for making latex foam and to an article comprising the latex foam obtained from the rubber dispersion of the present invention.

A thermoplastic polymer composition which is excellent in flexibility, mechanical properties, and moldability, capable of adhering to ceramics, metals, and synthetic resins without a treatment with a primer, and exhibits a high adhesion strength even when exposed to a high temperature environment, and a molded product obtained by using the thermoplastic polymer composition. The thermoplastic polymer composition includes 100 parts by mass of a thermoplastic elastomer (A), 1 to 100 parts by mass of a polyvinyl acetal resin (B), and 0.1 to 300 parts by mass a softener (C). The thermoplastic elastomer (A) is a block copolymer including a polymer block constituted by aromatic vinyl compound units and a polymer block constituted by conjugated diene units or a hydrogenated product of the block copolymer. The polyvinyl acetal resin (B) has a glass transition temperature of 80 to 130° C.

The present invention provides a rubber composition for an undertread, the rubber composition achieving excellent low heat build-up and high elastic modulus when formed into a tire; and a pneumatic tire that includes the rubber composition. The rubber composition for an undertread contains a diene rubber and a carbon black. The diene rubber contains a natural rubber and a modified polymer that is obtained by reacting a nitrone compound with a double bond of a conjugated diene polymer. The content of the natural rubber in the diene rubber is 60 mass % or greater, the content of the modified polymer in the diene rubber is from 8 to 40 mass %, the content of the carbon black is from 30 to 67 parts by mass per 100 parts by mass of the diene rubber, and the nitrogen adsorption specific surface area of the carbon black is from 20 to 60 m²/g.

The invention discloses a synthetic method of carbocyclic compound. Quinhydrone derivative and conjugated diene react in organic solvent under the catalysis of red lead and trifluoroacetic acid to prepare the carbocyclic compound. The method of the invention is 'one pot' method, takes cheap and accessible red lead as oxidant and catalyst, thus not only oxidizing quinhydrone derivative into corresponding benzoquinone derivative, but also catalyzing Diels-Alder reaction between benzoquinone derivative and conjugated diene, the reaction condition is mild, the reaction time is short, the product is easy to be purified, and the yield is high, thus being suitable for industrialized production and having wide application prospect.

A supported molded catalyst having increased hardness, the supported molded catalyst being capable of improving the long-term stability of a reaction for producing a conjugated diolefin by catalytic oxidative dehydrogenation from a mixed gas including a monoolefin having 4 or more carbon atoms and molecular oxygen; and a method for producing the catalyst is provided. A molded catalyst for conjugated diolefin production, the molded catalyst being a catalyst for producing a conjugated diolefin by a catalytic oxidative dehydrogenation reaction from a mixed gas including a monoolefin having 4 or more carbon atoms and molecular oxygen, and being produced by molding a composite metal oxide and a glass fiber-like inorganic auxiliary agent.

A polymer alloy which comprises 5 to 88 wt.% alpha,beta-ethylenically unsaturated nitrile-conjugated diene copolymer rubber (A) having a number-average molecular weight of 50,000 to 150,000, 10 to 60 wt.% acrylic copolymer (B) having units derived from an alpha,beta-ethylenically unsaturated nitrile monomer, and 2 to 50 wt.% alpha,beta-ethylenically unsaturated nitrile-conjugated diene copolymer rubber (C) having a number-average molecular weight of 1,000 to 20,000. The polymer alloy is excellent in oil resistance and ozone resistance and also in resistance to cracking caused by solvents.

Process for preparing diene polymers or random vinylarene-diene copolymers, said process comprising, optionally in the presence of at least one vinylarene, in at least one hydrocarbon solvent, at least one based on Anionic (co)polymerization of at least one conjugated diene monomer in the presence of a lithium initiator and at least one organic compound comprising at least one nitrogenoxy group having the general formula (I) or (II): where: mutually identical or different R ¹ , R ² , R ³ and R ⁴ represents a hydrogen atom; or is selected from C optionally containing heteroatoms such as, for example, oxygen, nitrogen or sulfur ₁ -C ₂₀ preferably C ₁ -C ₈ Linear or branched alkyl, optionally substituted cycloalkyl, optionally substituted C ₁ -C ₂₀ preferably C ₁ -C ₈ Linear or branched alkoxy, optionally substituted aryl; -x is an integer in the range from 0 to 7, preferably in the range from 4 to 5; -y is in the range from An integer in the range from 1 to 3, preferably in the range from 1 to 2.