摘要:
Heat resistant organic fibers comprising a wholly aromatic polymer having amide group and/or imide group, said fibers having properties satisfying the following formulas and wherein Tm is a melting point; Tex is an exotherm starting temperature; Xc is a degree of crystallization; DE is an elongation; DSR is a dry shrinkage factor at Tm; and DSR(Tm + 55°C) is a dry shrinkage factor at Tm + 55°C. The process for producing the fibers is also disclosed.
摘要:
Heat resistant organic fibers comprising a wholly aromatic polymer having amide group and/or imide group, said fibers having properties satisfying the following formulas and wherein Tm is a melting point; Tex is an exotherm starting temperature; Xc is a degree of crystallization; DE is an elongation; DSR is a dry shrinkage factor at Tm; and DSR(Tm + 55°C) is a dry shrinkage factor at Tm + 55°C. The process for producing the fibers is also disclosed.
摘要:
Described herein are propylene waxes and a production process thereof. The waxes are each produced by polymerizing propylene in a reaction vessel while using a solid catalyst in the presence or absence of an organoaluminum compound. A hydrogen partial pressure of a gas phase in the reaction vessel, said gas phase being formed of the propylene and hydrogen, is maintained at 10% or higher. The solid catalyst is formed of a transition metal compound or a reaction product between the transition metal compound and an organometallic compound, an aluminoxane and a fine particulate carrier. Also described herein is a heating-roll fixing type toner composition composed essentially of a binder resin or a binder resin composition, a colorant and, as a releasing agent, the wax.
摘要:
Disclosed herein is a process for preparing heat-resistant polymers by reacting an organic polyisocyanate with one or more compounds selected from the group consisting of organic polycarboxylic acids and organic polycarboxylic acid anhydrides in the presence of an alkali metal fluoride or an alkali metal fluoride combined with a quaternary onium salt as a catalyst.
摘要:
A method for preparing an ethylene copolymer which comprises the step of copolymerizing ethylene with an aromatic vinyl compound in the presence of a catalyst comprising (A) a specific transition metal compound represented by the formula I and (B) a cocatalyst such as an aluminoxane.
摘要:
A method for preparing a propylene (co)polymer having a substantially high syndiotactic structure and a desired molecular weight which comprises the step of (co)polymerizing propylene or propylene and a small amount of another olefin by the use of a transition metal compound catalyst having asymmetric ligands in the presence of a specific internal olefin.