摘要:
Disclosed is a method for preparing an ethylenic polymer with a low melting point in a more economical manner. In the ethylenic polymer preparation method, ethylene is polymerized under the presence of an olefin polymerization catalyst that is obtained by bringing an olefin polymerization catalytic component that comprises a transition metal complex represented by the following general formula (1), a trimerization catalytic component that comprises a transition metal complex represented by the following general formula (2), and an activating co-catalytic component into contact with each other.
摘要:
Disclosed are sanitary wares such as toilet bowls or wash bowls that have a glaze layer which can conceal the body of the sanitary wares satisfactorily without the need to use any opacifier and which is less likely to be contaminated. The sanitary ware includes: a sanitary ware body; and a glaze layer having a single-layer structure as a sole glaze layer on the sanitary ware body, the glaze layer comprising a phase-separated glass as the major part and the glaze layer having a surface roughness Ra of not more than 0.07 μm. Thus, the body of the sanitary ware can be concealed satisfactorily, and, in a preferred embodiment, a good white color can be imparted to the sanitary ware.
摘要:
A constant voltage circuit includes an output control transistor to control an output current from an output terminal to keep an output voltage constant at a set voltage; and an excess-current protection circuit to control the output control transistor. The excess-current protection circuit includes a current increase restriction element to restrict increase in the output current to decrease the output voltage; a first current limitation circuit to limit a gate voltage of the output control transistor to decrease the output current, when the output voltage is decreased to a first limited voltage; a second current limitation circuit to limit a gate voltage of the output control transistor to decrease the output current, when the output voltage is decreased to a second limited voltage smaller than the first limited voltage; and a selector to select whether the first current limitation circuit is operated or stopped.
摘要:
Disclosed is an ethylenic polymer having a long characteristic relaxation time. The ethylenic polymer satisfies the following requirements: (a) the ethylenic polymer is a non-crosslinked ethylenic polymer; (b) the number of long-chain branches (LCB) per 1000 carbon atoms is 0.1-1.5 inclusive; (c) the intrinsic viscosity [η] is 1.0-3.0 dl/g inclusive; and (d) the ratio (G′/G″) of the storage modulus (G′) to the loss modulus (G″), determined by dynamic viscoelasticity measurement at 190° C. and at an angular frequency of 0.1 rad/sec is 0.8 or more and 4.0 or less.
摘要:
Disclosed is an ethylenic polymer having a long characteristic relaxation time. The ethylenic polymer satisfies the following requirements: (a) the ethylenic polymer is a non-crosslinked ethylenic polymer; (b) the number of long-chain branches (LCB) per 1000 carbon atoms is 0.1-1.5 inclusive; (c) the intrinsic viscosity [η] is 1.0-3.0 dl/g inclusive; and (d) the ratio (G′/G″) of the storage modulus (G′) to the loss modulus (G″), determined by dynamic viscoelasticity measurement at 190° C. and at an angular frequency of 0.1 rad/sec is 0.8 or more and 4.0 or less.
摘要:
A production process of an olefin polymerization catalyst, comprising steps of (1) contacting a defined zinc compound, Zn(L1)2, with a defined halogenated alcohol, thereby forming a zinc atom-containing compound, and (2) contacting the zinc atom-containing compound with a defined transition metal compound and an optional organoaluminum compound; and a production process of an olefin polymer using such an olefin polymerization catalyst.
摘要:
Disclosed are a transition metal complex represented by the formula (1) and a method for producing the same; a substituted fluorene compound represented by the formula (2) and a method for producing the same; an olefin polymerization catalyst including the transition metal complex as a constituent component; and a method for producing a polyolefin resin, which includes polymerizing an olefin in the presence of the olefin polymerization catalyst.
摘要:
A solid catalyst component (A) for olefin polymerization comprising Mg, Ti, a halogen and a cyclic organic nitrogen compound (C), a solid catalyst comprising the solid catalyst component and an organoaluminum compound, and a process for producing an olefin polymer with the catalyst. According to the present invention, there can be provided an olefin polymerization catalyst having a high catalyst activity per titanium enough to make the removal of catalyst residues unnecessary and a process for producing an olefin polymer having a low content of low molecular weight component with the catalyst.
摘要:
Disclosed is a sanitary ware including a photocatalyst layer that has a high level of water resistance and abrasion resistance while maintaining a good photocatalytic activity. The sanitary ware includes a glaze layer and a photocatalyst layer provided on the glaze layer. The photocatalyst layer is an oxide film that is a co-fired product of a precursor of titanium oxide and a precursor of zirconium oxide and contains 65 to 90% by mass of titanium oxide and 10 to 35% by mass of zirconium oxide.
摘要:
A constant voltage circuit includes an output control transistor to control an output current from an output terminal to keep an output voltage constant at a set voltage; and an excess-current protection circuit to control the output control transistor. The excess-current protection circuit includes a current increase restriction element to restrict increase in the output current to decrease the output voltage; a first current limitation circuit to limit a gate voltage of the output control transistor to decrease the output current, when the output voltage is decreased to a first limited voltage; a second current limitation circuit to limit a gate voltage of the output control transistor to decrease the output current, when the output voltage is decreased to a second limited voltage smaller than the first limited voltage; and a selector to select whether the first current limitation circuit is operated or stopped.