Kraton Polymers U.S. LLC

Houston, TX, United States

Kraton Polymers U.S. LLC

Houston, TX, United States
SEARCH FILTERS
Time filter
Source Type

In order to provide a rubber composition having high transparency, toughness and heat-resisting property, the present invention can provide a composition comprising a neodymium-catalyzed isoprene rubber (IR) component; and a rubber polymer (RB) component selected from the group consisting of BR, 1,2-polybutadiene rubber, and SBR, wherein the amount of IR is from about 5 to 95 mass parts with the proviso that the total amount of IR and RB is 100 mass parts, wherein the composition is substantially free of silica, wherein the composition has haze of less than about 20 %, and wherein the composition has Type A Durometer hardness (0 sec) of about 30 or more.


A composition comprising (i) a controlled distribution styrenic block copolymer and (ii) a thermoplastic copolyester wherein the composition has a Shore A hardness of from about 50 to about 90 and a melt flow rate of from about 15 g/10 min. to about 50 g/10 min. as determined in accordance with ASTM D 1238.


Patent
Kraton Polymers U.S. Llc | Date: 2016-09-16

This disclosure relates to a block copolymer composition comprising a tetra-branched block copolymer (IV) having a true number average molecular weight of 40,000 to 120,000 represented by the general formula (A-B)4X; a tri-branched block copolymer (III) having a true number average molecular weight of from 30,000 to 90,000 represented by the general formula (A-B)3X; di-branched block copolymer (II) having a true number average molecular weight of from 20,000 to 60,000 represented by the general formula (A-B)2X; and a linear diblock copolymer (I) having a true number average molecular weight of from 10,000 to 30,000 represented by the general formula A-B; where A represents a polymer block of a mono alkenyl arene; B represents a polymer block of a conjugated diene, wherein the B has a true number average molecular weight ranging from 7,000 to 20,000 g/mol; and X represents the residue of an alkoxy silane coupling agent.


The present invention concerns aqueous emulsions and a process for preparing aqueous emulsions of a midblock sulfonated styrenic block copolymer comprising at least two non-sulfonated polymer end-blocks A and at least one sulfonated block B, comprising the steps of providing a cement of a midblock sulfonated styrenic block copolymer in the apolar solvent, mixing the cement with a co-solvent to form a mixture, emulsifying the mixture in the absence of a surfactant with water to produce an emulsion, and removing the hydrocarbon solvent and any optional co-solvent from the emulsion to produce the aqueous emulsion. The resulting emulsion of the midblock sulfonated styrenic block copolymer has relatively small particle diameters.


The present invention provides an aqueous emulsion and a process for preparing an aqueous emulsion of a midb!ock sulfonated styrenic block copolymer comprising at least two non-sulfonated polymer end-blocks A and at least one 5 sulfonated block B comprising the steps of providing a cement of a midblock sulfonated styrenic block copolymer in a non-polar solvent wherein the non-polar solvent is a hydrocarbon compound comprising from 5 to 12 carbon atoms with a boiling point of less than 100 degree Celsius or mixture of such compounds, mixing the cement with a co-solvent to form a mixture, emulsifying the mixture optionally in the 10 presence of an emulsifier with water to produce an emulsion, and removing the hydrocarbon solvent and optionally the co-solvent from the emulsion to produce the aqueous emulsion. The resulting emulsion of the midblock sulfonated styrenic block copolymer has relatively small particle diameters.


Patent
Kraton Polymers U.S. LLC | Date: 2017-03-22

A process is provided for preparing a branched conjugated diene polymer with a molecular weight distribution Mw/Mn of at least 1.1, by anionic polymerization, comprising the following reaction steps: a) Polymerizing a mixture of monomers comprising at least one conjugated diene and optionally one or more monoalkenyl arene compounds in the presence of an anionic initiator to form a living polymer; b) terminating the polymerization; and c) optionally functionalizing and/or hydrogenating the polymer so produced, wherein the mixture of monomers comprises an alpha,omega- bis(vinylphenyl)alkane as comonomer. The invention further relates to the polymer so obtained, a latex prepared therefrom, the latex, and articles made from the latex.


Patent
Kraton Polymers U.S. LLC | Date: 2017-02-08

The invention relates to a novel block copolymer comprising at least one polymeric monoalkenyl arene block and at least one polymeric myrcene block having a low and stable viscosity and having good adhesive properties when used in an adhesive composition or as a damping material. An adhesive composition is also described, preferably containing an SMS triblock optionally mixed with an SM diblock. The adhesive composition comprises: 1) a block copolymer having at least one polymeric monoalkenyl arene block and at least one polymeric myrcene block; 2) a tackifier; 3) optional plasticizer; and 4) optionally a stabilizer. Compared with adhesive compositions comprising SIS block copolymers, those comprising SMS block copolymers have lower and more stable viscosity.


Patent
Kraton Polymers U.S. LLC | Date: 2017-02-08

A block copolymer comprising: at least one monoalkenyl arene monomer polymer block (A) and copolymer block (B) containing myrcene, said copolymer block B also including: a) at least one conjugated diene monomer having a lower molecular weight than myrcene, or b) at least one monoalkenyl arene monomer, or c) a mixture of a) and b). The polymer block A may be a copolymer block. When the polymer block A is a copolymer block, both block A and the copolymer myrcene block copolymer B can have a random, tapered or a controlled distribution configuration of comonomers. The block copolymer can be selectively or exhaustively hydrogenated. The block copolymer may be used in making adhesives and vibration damping compositions.


Patent
Kraton Polymers U.S. LLC | Date: 2017-02-01

The invention relates to a selectively hydrogenated isoprene-styrene diblock copolymer having a polystyrene content of at least 40 wt.%, which when added to an oil-based mud composition, substantially reduces fluid loss. The polystyrene in the diblock has a true molecular weight greater than 60 kg/mole and the total apparent molecular weight of the diblock copolymer is at least 160 kg/mole. The drilling mud that contains about 0.5 pounds per barrel to about 10 pounds per barrel of a selectively hydrogenated isoprene-styrene diblock copolymer and a weighting agent, resulting in a drilling fluid composition exhibiting good suspension of the weighting agent and improved fluid loss performance.


Patent
Kraton Polymers U.S. LLC | Date: 2017-03-22

A process is provided for preparing a coupled polymer by anionic polymerization wherein the coupled polymer is a conjugated diene polymer comprising the following reaction steps: a) polymerizing a monomer or a mixture of monomers comprising at least one conjugated diene optionally one or more monoalkenyl arene compounds in the presence of an anionic initiator to form a living polymer arm or mixture of arms, with an average apparent molecular weight greater than 2000; b) reacting the living polymer arm or arms (P) with a polyalkenyl coupling agent (CA), c) terminating the polymerization if any living polymers remain after step b), and d) optionally functionalizing and/or hydrogenating the coupled polymer so produced, wherein the polyalkenyl coupling agent is an alpha,omega-bis(vinylphenyl)alkane. Also provided is the polymer so prepared and its use in concentrates, aqueous emulsions and products made from aqueous emulsions.

Loading Kraton Polymers U.S. LLC collaborators
Loading Kraton Polymers U.S. LLC collaborators