Houston, TX, United States
Houston, TX, United States

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Patent
Kraton Polymers U.S. Llc | Date: 2016-03-09

A method for the curing of aqueous latexes comprising block copolymers is disclosed. The block copolymers have the general formula A-B-A or A-B-Y-(B-A)_(n). The curing is conducted using vulcanization systems that are free of guanidine and thiuram compounds. The cured latexes are useful in the manufacture of elastic films, surgical, examination and electrical insulation gloves, industrial gloves and condoms.


Patent
Kraton Polymers U.S. LLC | Date: 2016-01-20

A process for preparing an amino- functionalized block copolymer in an inert hydrocarbon solvent and in the presence of an initiator comprising: (a) polymerizing an end block A, (b) polymerizing an interior block B, the B block having a Tg of at most 20C; (c) polymerizing a block D from a plurality of p-vinylbenzylamino derivative monomers, other than 4-vinylbenzylpiperidine, the p-vinylbenzylamino derivative monomers capable of being polymerized at a temperature range of from 20C to 60C; thereby forming a block polymer or a living block polymer comprising the blocks A, B and D. An anionic exchange membrane.


Patent
Kraton Polymers U.S. Llc | Date: 2016-06-07

A composition is disclosed, comprising a block copolymer, at least one homopolymer or copolymer of butene, and at least one olefin homopolymer or copolymer, wherein said block copolymer has hydrogenated low-vinyl polybutadiene end blocks with a specific gravity>0.85 g/cc, and a controlled distribution midblock of polyalkenyl arene/hydrogenated diene. Although the block copolymer has a preferred linear structure as a triblock copolymer, it may also be branched or radial coupled copolymer that has at least 2 arms or more. The composition is useful for rotational molding, slush molding, injection molding, extrusion or compression molding, or thermoforming or calendering for making articles that are resistant to chemicals such as diesel fuel, for the automotive market, for example. The MFR of the block copolymer is 1 to about 50 g/10 min. at 230 C., with a wt. of 2.16 kg.


Patent
Kraton Polymers U.S. Llc | Date: 2016-06-07

Provided herein is a composition containing a hydrogenated blend of a semi-crystalline, selectively hydrogenated block copolymer, a selectively diblock copolymers lacking semi-crystalline blocks, and a low polarity fluid for cable filling applications. The block copolymer comprises blocks of semi-crystalline hydrogenated polybutadiene, blocks of poly(mono alkenyl arenes), and blocks of hydrogenated, non-crystalline conjugated dienes. The diblock copolymer comprises blocks of poly(mono alkenyl arenes) and blocks of non-crystalline poly(conjugated diene(s)). The compositions can be converted to non-flowable gels and find application as fillers for cables such as fiber optic cables.


The present invention provides a process for forming an article from a diene rubber, comprising: providing a raw diene rubber substance comprising 1,2-polybutadiene rubber component; adding to the raw diene rubber substance a peroxide as a vulcanizing agent; softening the raw diene rubber at a first temperature of not more than 200 C.; vulcanizing the diene rubber at a second temperature of not more than 200 C., with contacting the diene rubber to an ambient atmosphere; and forming from the vulcanized diene rubber an article.


The present disclosure relates to a solid curable transparent rubber composition containing a styrenic block copolymer having 2 or more poly(vinyl aromatic) blocks, a curing agent and additives. Once cured, the solid curable transparent rubber composition has a haze of less than 30% and a total light transmission of more than 80%. The disclosure further relates to a cured transparent rubber composition made thereof, and a manufacturing process for the cured composition. The present disclosure also relates to an article including the rubber composition, in particular for tubes, medical stoppers, catheters, dental dams and other medical applications and artificial nipples.


The present disclosure provides a solid curable transparent rubber composition containing one or more synthetic isoprene polymer, one or more transparent polymer, one or more curing agent, additives that do not influence transparency and one or more polyalkenamers. The solid curable transparent rubber composition, once cured, has a haze of less than 30% and a total light transmission of more than 80%. The disclosure further provides a cured transparent rubber composition made thereof, and a manufacturing process for the cured composition. The present disclosure also provides an article including the rubber composition, in particular shoes with transparent soles.


Patent
Kraton Polymers U.S. Llc | Date: 2016-03-29

The present disclosure provides a process for preparing a cured transparent rubber composition containing a synthetic isoprene polymer(s), a transparent polymer(s), a curing agent and additives. The process includes mixing the components at a temperature ranging from 50 to 130 C., curing the compound with peroxide and allowing the compound to mature. The maturated compound is fed to an injection moulding machine. The cured transparent rubber composition prepared using the methods described herein has a haze of less than 30% and a total light transmission of more than 80%. The disclosure further provides an article including the cured transparent rubber composition, in particular for medical applications and artificial nipples.


The present disclosure relates to a curable transparent rubber composition containing one or more synthetic isoprene polymers, a styrenic block copolymer, a curing agent, and additives that do not influence transparency of the final composition. Once cured, the curable transparent rubber composition has a haze of less than 30% and a total light transmission of more than 80%. The disclosure further relates to a cured transparent rubber composition made thereof, and a manufacturing process for the cured composition. The present disclosure also relates to an article including the rubber composition, in particular for tubes, medical stoppers, catheters, dental dams and other medical applications and artificial nipples.


Patent
Kraton Polymers U.S. LLC | Date: 2016-01-06

In order to provide a rubber composition having high transparency and toughness, the present invention can provide a crosslinked rubber composition, being substantially free of silica, comprising a first olefin polymer having refractive index of between 1.500 to 1.525 at 23 degree C; and a second olefin polymer which is different from the first olefin polymer, wherein the composition has haze of 20 % or less on 2 mm thick sheet, measured according to JIS K7136, and wherein the composition has Type A Durometer hardness (0 sec) of 35 or more, measured according to JIS K6253.

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