A tetraanionic OCO pincer ligand metal-oxo-alkylidene complex is prepared from a trianionic pincer ligand supported metal-alkylidyne. The metal can be tungsten or other group 5-7 transition metal. The tetraanionic pincer ligand metal-oxo-alkylidene complex, a trianionic OCO pincer ligand metal complex, or a trianionic ONO pincer ligand metal complex can be used to polymerize cycloalkenes. The poly(cycloalkene)s are predominantly cis-alkene macrocyclics.

In an aspect, a method of synthesizing a graft copolymer comprises the steps of: copolymerizing a first macromonomer and a first reactive diluent; wherein said first macromonomer comprises a first backbone precursor directly or indirectly covalently linked to a first polymer side chain group; wherein said reactive diluent is provided in the presence of the first macromonomer at an amount selected so as to result in formation said graft copolymer having a first backbone incorporating said diluent and said first macromonomer in a first polymer block characterized by a preselected first graft density or a preselected first graft distribution of said first macromonomer. In some embodiments of this aspect, said preselected first graft density is any value selected from the range of 0.05 to 0.75. In some methods, the composition and amount of said diluent is selected to provide both a first preselected first graft density and a first preselected first graft distribution.

The invention relates to an N-heterocyclic carbene complex of general formulas I to IV (I) (II) (III) (IV), according to which A1 stands for NR2 or PR2, A2 stands for CR2 R2, NR2, PR2, 0 or S, A3 stands for N or P, and C stands for a carbene carbon atom, ring B is an unsubstituted or a mono or poly-substituted 5 to 7-membered ring, substituents R2 and R2 stand, inter alia, for a linear or branched C1-Cw-alkyl group and, if N and N each stand for NR2 or PR2, are the same or different, M in formulas I, II, III or IV stands for Cr, Mo or W, X 1 or X2 in formulas I to IV are the same or different and represent, inter alia, C1-C1s carboxylates and C1-C1s-alkoxides, Y is inter alia oxygen or sulphur, Z is inter alia a linear or branched C1-Cw-alkylenoxy group, and R 1 and R1 in formulas I to IV are, inter alia, an aliphatic or aromatic group. These compounds are particularly suitable for use as catalysts for olefin metathesis reactions and have the advantage, compared to known Schrock carbene complexes, of displaying clearly increased tolerance to functional groups such as, in particular, aldehydes, secondary amines, nitriles, carboxylic acids and alcohols.

A cycloolefin rubber having a weight average molecular weight of 100,000 to 800,000, having a silyl group at the polymer chain end, and containing a fatty acid ester of a polyvalent alcohol. A cycloolefin rubber excellent in processability at the time of blending and kneading and excellent in low heat buildup property can be provided.

Provided is a cyclopentene ring-opening copolymer comprising a structural unit derived from cyclopentene and a structural unit derived from a norbornene compound with three or more rings, wherein the content of the structural unit derived from a norbornene compound with three or more rings is 40 to 80 wt % in relation to the whole of the repeating structural units in the cyclopentene ring-opening copolymer.

The present invention provides a resin composition comprising an alicyclic-structure-containing polymer and a polyglyceride-based additive, wherein the polyglyceride-based additive includes one or a plurality of polyglyceride compounds, the polyglyceride-based additive has a hydroxyl value of 320 to 700 mgKOH/g, and the content of the polyglyceride-based additive is 0.2 to 2.0 parts by weight based on 100 parts by weight of the alicyclic-structure-containing polymer. The present invention also provides a resin formed article obtained by forming the resin composition. According to the present invention, a resin composition which hardly whitens even under a hot and humid environment and hardly causes a bleed-out phenomenon of additives, and a resin formed article obtained by forming the resin composition are provided.

The present invention relates to a thermally conductive polymer composition. The thermally conductive polymer composition comprises (a) 30 to 60 parts by weight of a polymer, and (b) 100 parts by weight of a boron nitride filler comprising, (b-1) 70 to 99 parts by weight of a spherical boron nitride filler, and (b-2) 1 to 30 parts by weight of a sheet boron nitride filler having a thickness of 5 to 500 nm, a surface area of 4 to 50 m.sup.2/g and an aspect ratio of 100:1 to 10000:1.

A process for producing cycloalkenamer-containing compositions involves converting at least one cycloalkene by ring-opening metathetic polymerization to obtain a polyalkenamer-containing product mixture. The product mixture is worked up to remove monomers and oligomers of the cycloalkenes to obtain the polyalkenamer-containing composition by extraction with CO.sub.2. The extraction involves at least two stages: an extraction with liquid CO.sub.2 under the supercritical conditions, and then an extraction with supercritical CO.sub.2. Such cycloalkenamer-containing compositions can be used, for example, in the field of packaging materials, especially for food and drink.

Polydicyclopentadiene (PDCPD) is a polymer of growing importance in industrial applications. Frontal ring-opening metathesis polymerization (FROMP) offers a means to rapidly cure PDCPD with minimal input energy owing to a propagating reaction wave sustained by the exothermic polymerization. The disclosure provides methods for the rapid fabrication of fiber reinforced composites that is less restrictive and more energy efficient than conventional methods.

There are provided a photoreactive copolymer and an alignment layer comprising the same, and more particularly, to a photoreactive copolymer including a copolymer of two different kinds of monomers, and an alignment layer comprising the same. The photoreactive copolymer according to the present invention may have excellent liquid crystal alignment property and alignment speed, easily change an alignment direction depending on a polarization direction, and have excellent solubility to an organic solvent, such that the photoreactive copolymer may be used in various fields such as a liquid crystal device, and the like.