Disclosed are a polymer having a narrow molecular weight distribution prepared by living radical and a polymer manufacturing method comprising a step of performing living radical polymerization using 0.005 to 0.5 parts by mass of an oxygen radical scavenger per 100 parts by mass of a radical polymerizable monomer.

Disclosed is a functionalizing method for the end functionalisation of trans-1,4 stereo-regular polydiene chains obtained by the coordination catalytic polymerisation of at least one conjugated diene monomer. It also relates to a polydiene having a trans-1,4 chain formation rate of at least 85%, preferably at least 90%, and an end functionalisation rate higher than 70%, preferably higher than 80%, and more preferably higher than 90%.

A method of polymerizing a first, and a second class of monomers to form product polymer. The first class of monomers polymerize via a radical pathway in the presence of light, and the second class of monomers polymerize via an insertion pathway in the absence of light.

A polymer composition, in which a differential distribution value in a differential molecular weight distribution curve of the polymer composition, as measured by gel permeation chromatography, satisfies Equation 1 and a maximum value of a normalized back-scattering intensity of a 35 wt % base oil solution of the polymer composition, where a size q of a scattering vector of small-angle X-ray scattering at 25° C. is in a range of 0.07 nm.sup.−1 or more and 2 nm.sup.−1 or less, is 40 cm.sup.−1 or more.

Butadiene-isoprene diblock copolymer formed by a block of crystalline polybutadiene (hard block) and by a block of amorphous polyisoprene (soft block). Said butadiene-isoprene diblock copolymer can be advantageously used both in the footwear industry (for example, in the production of shoe soles), and in the production of tires for motor vehicles and/or trucks.

The present invention provides a preparing method of a polymer which is low-toxic, environmental-friendly, highly controllable, and low cost to obtain a polymer with high molecular weight. The preparing method comprises conducting a controlled radical polymerization process of monomer (Y). In the controlled radical polymerization process, organic compound (A) which has the formula (I) and radical initiator (B) are existing in a mole ratio (B/A) ranged from 0.5 to 25,

##STR00001## wherein R.sup.1 is a hydrogen atom, alkyl group, aryl group, or hydroxyl group, the alkyl group can be alkyl having substituents or alkyl substituent, and the aryl group can be aryl having substituents or aryl substituent.

The present invention aims to provide a method capable of easily and efficiently producing a vinyl ether group-containing (meth)acrylic acid ester polymer. The present invention relates to a method of producing a vinyl ether group-containing (meth)acrylic acid ester polymer, the method including group-transfer polymerizing a monomer component containing a vinyl ether group-containing (meth)acrylic acid ester represented by the following formula (1), in the presence of a carbon-carbon double bond-containing silane compound and a catalyst, ##STR00001##
wherein R.sup.1 is a hydrogen atom or a methyl group; R.sup.2 and R.sup.3 are the same as or different from each other and are each a hydrogen atom or an organic group; R.sup.4 is a hydrogen atom or an organic group; and n is an integer of 1 or more.

The present invention addresses the problem of providing a fluorine-containing aromatic polymer; a method for producing the fluorine-containing aromatic polymer; etc. The problem can be solved by: a polymer having a monomer unit represented by formula (1) (wherein R.sup.1 in each occurrence is independently a halogen atom, NR.sup.11R.sup.12 (wherein R.sup.11 and R.sup.12 are independently a hydrogen atom or an organic group), or an organic group; n1 is an integer of 0 to 4; two R.sup.1s that can be present in the ortho-positions may form a ring together with two carbon atoms on the adjacent benzene ring, wherein the formed ring may have an organic group as a substituent; and L.sup.1 is a single bond, an oxygen atom, a sulfur atom, -L.sup.11-O—, —O-L.sup.12-O—, -L.sup.13-S—, or —S-L.sup.14-S— (wherein L.sup.11 to L.sup.14 are each independently an alkylene group optionally having one or more substituents); etc.

Embodiments are directed to a method of making an olefin-based polymer by free-radical polymerization in a reactor system. The method includes initiating a free-radical polymerization of an olefin-based monomer, propagating growth of the olefin-based polymer during continued free-radical polymerization of the olefin-based monomer, and adding to the reactor system a chain transfer agent that terminates the growth of the olefin-based polymer. The chain transfer agent includes a silane. Examples of suitable silanes are: triethylsilane, diethylmethylsilane, tris(trimethylsilyl)silane, n-butylsilane, dimethylphenylsilane, phenylsilane, chlorodimethylsilane, diisopropylaminosilane, 1,2-bis(dimethylsilyl) benzene, 1,3-bis(dimethylsilyl) benzene, 1,4-bis(dimethylsilyl)benzene, 1,1, 3,3-tetramethyldisiloxane, trimethylsilane, (trimethylsilyl)dimethylsilane, and bis(trimethylsilyl)methylsilane.

A light-emitting polymer comprising a repeat unit of formula (I): R.sup.1-R.sup.4 are each independently H or a substituent; and Ar.sup.1 and Ar.sup.2 are each independently an aromatic or heteroaromatic group selected from formulae (IIa) and (IIb): The polymer may be formed from a non-luminescent or weakly luminescent monomer.

##STR00001##