摘要:
A high-quality optical compensator for use in liquid crystal display elements can be prepared from a film comprising an end unit modified liquid crystalline polymer which has a monofunctional structural unit and which exhibits an optically positive uniaxiality, and, as needed, a liquid crystalline polymer which has a logarithmic viscosity at least 0.01 dl/g higher than that of the end unit modified liquid crystalline polymer and a glass transition point at least 5 °C higher than that of the end unit modified liquid crystalline polymer and which exhibits an optically positive uniaxiality, wherein a nematic hybrid orientation which is formed in the liquid crystal state is immobilized.
摘要:
A process for the fluid catalytic cracking of heavy fraction oils containing heavy metals such as Ni and V, which comprises withdrawing a portion of ferrite-containing catalyst particles circulating in a fluid catalytic cracking apparatus, separating the thus withdrawn catalyst particles into metals-richly deposited catalyst particles and metals-poorly deposited ones by using a magnetic separator and then returning the metals-poorly deposited catalyst particles, together with fresh ferrite-containing catalyst particles, into said cracking apparatus.
摘要:
A novel ethylene/α-olefin copolymer superior in melt characteristics such as fluidity and exhibiting high impact resistance, mechanical strength, transparency and low-temperature heat sealability is provided. The novel copolymer is prepared by the copolymerization of ethylene and an α-olefin of 4 to 20 carbon atoms and satisfies the conditions of a melt index of 0.01 to 100, a density (d) of 0.880 to 0.940, an Mw/Mn ratio in the range of 2.0 to 15, an N value of 1.25 to 2.5, provided N value ≧ 1.32 log (Mw/Mn) + 0.86, a DSC melting point peak of 70° to 120°C and a branching degree, B, per 1,000 carbon atoms of -710d + 662 ≦ -725d + 686.
摘要:
A refrigerator oil for use with a hydrogen-containing halogenocarbon refrigerant, comprising at least one kind of an ester selected from the group consisting of a specific pentaerythritol ester such as an ester of pentaerythritol with a mono- or dicarboxylic acid, a specific polyol ester such as an ester of trimethylolethane with a mono- or dicarboxylic acid, a specific ester such as an ester of ethylene glycol and a dicarboxylic acid, and a specific polyol ester synthesized from a neopentyl type polyhydric alcohol, a monocarboxylic acid and a dicarboxylic acid.
摘要:
A polyolefin having superior particle properties such as an extremely high bulk density, a large average particle diameter and a narrow particle size distribution, and having a narrow molecular weight distribution, is obtained in high yield, by polymerizing an olefin, using a catalyst comprising a solid catalyst component and an organometailic compound, the solid catalyst component being obtained by reacting a) a silicon oxide and/or an aluminum oxide, the reaction product of an organomagnesium compound and a compound of the general formula Me(OR) n X z - n and a titanium compound, in the presence of ROH, and further reacting the resulting reaction product with a compound of the general formula AlR q X 3 - q .