Abstract: Provided is a silicone-containing polyurethane resin composition including: an isocyanate group-terminated, NCO-terminated modified silicone prepolymer obtained by allowing a first polyisocyanate to undergo reaction with a modified silicone containing at least one hydroxyl group at a terminal; a silicone oil; and an isocyanate group-terminated, NCO-terminated urethane prepolymer obtained by allowing a second polyisocyanate to undergo reaction with polyol, wherein reactivity of the first polyisocyanate with a curing agent is higher than reactivity of the second polyisocyanate with a curing agent.

Abstract: A conductive roller which can form images of consistent quality and does not cause image failures such as formation of blank spots and a method for inspecting the roller. The conductive roller having a metallic core and at least one rubber elastic layer provided on the outer peripheral surface of the core, the rubber elastic layer being formed from a conductive rubber to which conductivity has been imparted by carbon powder, wherein the conductive roller satisfies the relationship represented by formula (1): Zr/Zc?5??(1), wherein Zr (?) represents a resistance component and Zc (?) represents a capacitive reactance component, the resistance component Zr (?) and the capacitive reactance component Zc (?) being calculated respectively from impedance Z (?) and phase difference ?, when the impedance Z (?) is measured upon application of an AC voltage of 0.2 V at a frequency of 1 Hz to the rubber elastic layer.

Abstract: The invention provides a method for producing an oil-resistant elastomer being cross-linked millable polyurethane obtained by polyaddition of at least one polyester diol and at least one diisocyanate, comprising the steps of:selecting the kinds and blend proportion of the at least one polyester diol and the at least one diisocyanate, respectively, so that the resulting polyurethane has an ester group concentration of at least 25 wt. % (5.7 mmol/g) and less than 35 wt. % (8 mmol/g) and a urethane group concentration of at least 7 wt. % (1.2 mmol/g) and less than 12 wt. % (2.0 mmol/g), reacting the at least one polyester diol and at least one diisocyanate to produce a millable polyurethane, and crosslinking the millable polyurethane with a curing agent to form an oil-resistant elastomer which has a rubber hardness of JIS A 95° or less and an elongation at break of at least 100%, wherein the elastomer exhibits a percent change in weight, when exposed to IRM 903 lubricating oil, of 20% or less.

Abstract: The invention provides a conductive roller which can form images of consistent quality and does not cause image failures such as formation of blank spots and a method for inspecting the roller. The conductive roller having a metallic core and at least one rubber elastic layer provided on the outer peripheral surface of the core, the rubber elastic layer being formed from a conductive rubber to which conductivity has been imparted by carbon powder, wherein the conductive roller satisfies the relationship represented by formula (1): Zr/Zc?5??(1), wherein Zr (?) represents a resistance component calculated from impedance Z (?) and phase difference ?, and Zc (?) represents a capacitive reactance component, as measured upon application of an AC voltage of 0.2 V at a frequency of 1 Hz.

Abstract: A method for producing an oil-resistant elastomer being cross-linked millable polyurethane obtained by polyaddition of at least one polyester diol and at least one diisocyanate, and oil-seal members made therefrom.

Abstract: The present invention provides an electrophotography rubber member which has a rebound resilience remaining satisfactorily stabilized over changes in environmental conditions and can serve as a member such as a high-performance cleaning blade and provides a similar sheet-separation rubber member which generates no noise. The electrophotography rubber member or sheet-separation rubber member is formed of a rubber elastomer containing a polyurethane formed from a long-chain polyol containing a polyester-polyol having a number average molecular weight of 500-5,000 and an ester concentration of 2-8 mmol/g, wherein the ester concentration is defined by the following relationship: Ester concentration (mmol/g)=(Amount by mol of ester groups)/(Weight of the polyester-polyol).

Abstract: Cured elastomers having oil resistance as well as well-balanced physical properties including high mechanical strength with excellent low-temperature resistance, heat resistance, and rubber elasticity. The elastomers hase a rubber hardness in accordance with JIS A of 95° or less and an elongation at break of at least 100%, and has oil resistance to a lubricating oil which highly swells an object, the elastomer being formed by cross-linking a millable polyurethane obtained through polyaddition of polyester diol and diisocyanate.

Abstract: A method for preparing an amorphous polymer chain in an elastomer which permits use of previously unavailable monomers while permitting control of crystallizability of the amorphous polymer chain. The method of the present invention thus permits an increased range of industrial scale production by broadening the range of raw materials which can be used and by increasing the design options in constructing the chain.

Abstract: A method for producing millable polyurethanes by first producing a poly-.epsilon.-caprolactone based diol, the poly-.epsilon.-caprolactone based diol containing a controlled average number of caprolactone units and having a molecular weight distribution; and reacting the poly-.epsilon.-caprolactone based diol with a diisocyanate to produce a polyurethane with a restricted crystallizability having a rubber elasticity. The resulting millable polyurethanes exhibit excellent hydrolysis resistance, show no crystallization at low temperatures and have excellent mechanical properties.