Korea Kumho Petrochemical Co., Ltd.

Other

Young-Hoon Ko

Hoo-Chae Kim

Jin-Man Hwang

Shin Han

Eun-Kyoung Kim

Seung-Duk Cho

Jae-Yun Kim

Jae-Young Ko

Young-Chang Jang

Hyung-Kyu Choi

Hyoung-Suk Cho

Jung-Goo Lee

Jae-Yoon Kim

Seonkyeong Cheong

The present invention provides a method for preparing a copolymer useful for the manufacture of tires by coupling the ends of a living polymer obtained from copolymerization of a diene monomer and a vinyl aromatic monomer in the presence of an organolithium catalyst and a hydrocarbon solvent with a multi-reactive polysiloxane compound and then modifying the remaining uncoupled ends of the polymer with an amine compound. The use of the copolymer thus obtained for the fabrication of tires improves the affinity to silica as well as carbon black used as a reinforcing material and provides enhanced properties required for tires, such as increased wet traction, reduced rolling resistance, and increased tread wear.

Preparation method of copolymer

The present invention provides a method for preparing a copolymer useful for the manufacture of tires by coupling the ends of a living polymer, obtained from copolymerization of a diene monomers in the presence of an organolithium initiator and a hydrocarbon solvent, with a multi-reactive polysiloxane compound, and subsequently modifying the remaining uncoupled ends of the polymer with an amine compound. The use of the copolymer thus obtained for tire production improves the affinity to silica and greatly enhances the dynamic properties required for tires, such as wet traction and rolling resistance.

Preparation method of diene copolymer having improved rolling resistance and wet traction

The present invention relates to a process for polymer hydrogenation that includes: polymerizing or copolymerizing at least one conjugated diene in a hydrocarbon solvent using an organic alkali metal polymerization initiator to generate a living polymer; adding a terminating agent selected from amines, esters, ketones, or halogen compounds to deactivate the active terminal of the living polymer; and selectively hydrogenating the conjugated diene polymer using at least one organotitanium compound and a lithium hydride, which is prepared from a reactor equipped with a high-speed injection nozzle and thereby precisely controlled in regard to particle diameter. The lithium hydride as used in this process is a highly active lithium hydride having a precisely controlled particle diameter as prepared from a reactor equipped with a high-speed injection nozzle to acquire stable hydrogenation reaction rate and hydrogenation reproducibility, and particularly allow the quantitative control of the lithium hydride/titanium mole ratio in the hydrogenation of the conjugated diene polymer having different molecular weights, thereby maintaining a high hydrogenation activity.

Process for polymer hydrogenation using lithium hydride prepared from reactor equipped with high-speed injection nozzle

A halogen-substituted reactive polysiloxane compound has a number average molecular weight of 400 to 100,000 and is represented by the formula Y&mdash;&lcub;C(R )(R )&rcub; &mdash;CH CH &mdash;Si(R )(R )&mdash;&lcub;O&mdash;Si(R )(R )&rcub; &mdash;CH CH &mdash;&lcub;C(R )(R )&rcub; &mdash;Y, in which Y is (X) (R) Si or (X) (R ) &mdash;Bz&mdash;C(R ) (X) ; X is a halogen atom selected from F, Cl, Br and I; R is an alkyl group from C to C including methyl, ethyl or propyl; R , R , R and R are a hydrogen, an alkyl group from C to C including methyl, ethyl or propyl, or a halogen-substituted alkyl or silane group; R is defined as R , or (X) (R ) C&mdash;&lcub;C(R )(R )&rcub; ; a is an integer from 1 to 3, and b is an integer from 0 to 2, wherein a&plus;b&equals;3; c is an integer from 0 to 1000; d is an integer from 1 to 50000; e and f are independently an integer from 0 to 4, wherein e&plus;f&equals;4; g and h are independently an integer from 0 to 3, wherein g&plus;h&equals;3; i and j are independently an integer from 0 to 3, wherein i&plus;j&equals;3; and Bz is a benzene ring.

Multi-reactive polysiloxane compound having halogen substituents and synthetic method thereof

This invention relates to a process for hydrogenating selectively the unsaturated double bonds of copolymer having the double bonds of conjugated diene unit, which has been widely used as a modifier of transparent impact-resistant resin or polyolefin, and polystyrene resin. According to this invention, the copolymer is saturated via hydrogenation in the presence of a novel homogeneous system organotitanium catalyst without a separate reducing agent, thus representing an extremely high hydrogenation yield with remarkable hydrogenation reproducibility. Hence, a compound represented by the following formula I is employed as an appropriate catalyst. Formula I ##STR1## Wherein Cp is a cyclopentadienyl (C.sub.5 H.sub.5) group; R.sub.1, R.sub.2 and R.sub.3 are hydrogen atom or alkyl group of 1 to 3 carbon atoms; and

Process for hydrogenating conjugated diene polymers

A method for hydrogenating living polymers that include mainly conjugated double bond monomers and aromatic vinyl monomers. At least one conjugated diene compound is polymerized or copolymerized in an inert solvent by using a polymerization initiator of organic alkali metal. The produced polymer is contacted with hydrogen in the presence of a catalyst. The catalyst is formed of a cyclopentadienyl titanium compound represented by: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are independently selected from halogen groups, C.sub.1 -C.sub.8 alkyl groups, C.sub.1 -C.sub.8 alkoxy groups, C.sub.6 -C.sub.20 aryloxy groups, C.sub.6 -C.sub.20 cycloalkyl groups, silyl groups, and carbonyl groups. A cocatalyst is provided of alkoxylithium compound represented by:

Method of hydrogenation of living polymer

There is provided a method for selectively hydrogenating a living polymer having olefinic double bonds. A monomer having at least one conjugated double bond, optionally together with an olefinic monomer, is polymerized in the presence of an alkyllithium polymerization initiator, to give a living polymer. This olefinic living polymer is reacted with a hydrocarbon compound, to give a deactivated living polymer and a hydrocarbon lithium compound. The double bonds within the conjugated dien units of the polymer are selectively hydrogenated in the presence of a monocyclopentadienyltitanium compound which is under the influence of the hydrocarbon lithium compound. The hydrocarbon, which acts as a deactivator of the living polymer, terminates the anion polymerization occurring due to an activated anion of the living polymer and thus, prevents the intermolecular cross-linking of the polymers so that the gelation of the polymers does not occur. In addition, the hydrocarbon lithium serves as a reducing agent for the hydrogenating catalyst, monocyclopentadienyltitanium compound, so that a high selectivity and hydrogenation efficiency can be obtained without accurate adjustment of Li/Ti mole ratio.

Selective hydrogenation method of living polymer having olefinic double

There is provided a method for selectively hydrogenating living polymers having olefinic double bonds, in which the living polymers resulting from the polymerization initiated by alkyllithium compound are deactivated by contacting the polymerization terminators for a short time under a mild condition and hydrogenated in the presence of bis(cyclopentadienyl)titanium compound in high efficiency and high reproducibility without adjusting accurate molar ratio of the lithium compound to the titanium compound.

Method for selectively hydrogenating a living polymer having olefinic

There are disclosed a wholly aromatic polyester represented by formula I with enhanced flame retardance and chemical stability, and a method for the preparing the same. The polymer is prepared in interface polymerization wherein an alkali aqueous phase containing cyclotriphosphagene-containing bisphenols is in contact with an organic phase containing aromatic dicarboxylic acid chlorides in the presence of a phase transfer catalyst. ##STR1## wherein m and n each are an integer which satisfies the following conditions: 0&lt;m/(m+n)&lt;1 and 0&lt;n/(m+n)&lt;1; X represents --O--, --S--, --SO.sub.2 --, --SO--, --CO--, an alkylene group of C.sub.1-4, or an alkylidene group of C.sub.1-4 ; and R.sub.1, R.sub.2, R.sub.3, R.sub.1 ', R.sub.2 ', R.sub.3 ' and R.sub.4 ' are the same or different, and represent a hydrogen atom, a halogen atom, or an alkyl group of C.sub.1-4 or the derivatives thereof, respectively.

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Taejeon, South Korea

Young-Hoon Ko