Daicel Corporation

Oki Electric Industry Co., Ltd.

Topy Kogyo Kabushiki Kaisha

Nippon Valqua Industries, Ltd.

Takashi Konno

Shintarou Hatanaka

Jun Watanabe

Akira Muramatsu

Kenichi Takahashi

Seiji Oomura

Masaki Ohara

Akiyoshi Kurihara

Shunsuke Tanaka

Kouji Toriyama

Noriyuki Andou

Naritoshi Maetsu

Hiromasa Muraki

Provided is a novel polycarbonate polyol derivative having a terminal amino group. The polycarbonate polyol derivative of the present disclosure is represented by Formula (1) below. In Formula (1), A denotes a group having a polycarbonate skeleton, and n and m are average values and are numbers satisfying n≥2 and n−m>0. The group A in Formula (1) is a group in which all hydroxyl groups are removed from the structural formula of a polycarbonate polyol having a number average molecular weight from 300 to 10000, and preferably includes a group having a repeating unit represented by Formula (a) below.

Polycarbonate polyol derivative

Provided is a composition capable of forming a cured product having excellent adhesion to a substrate, hardness, scratch resistance, and chemical resistance. The composition of the present disclosure includes a polyol compound (A) and an isocyanate compound (B), the polyol compound (A) containing a compound (a1) having a number average molecular weight calibrated with polystyrene standards of less than 800 and being represented by Formula (1), where Rto Rare a group represented by Formula (1a); and the isocyanate compound (B) containing a compound (b) represented by Formula (2), where Lto Lare a hydrogen atom, an NCO group, or an alkyl group having from 1 to 10 carbon atom(s) and having a group represented by Formula (2').

Composition and cured product of same

Provided is a polyester polyol that can be used for forming a polyurethane excelling in durability and solvent resistance. A polyester polyol of the present invention is represented by Formula (1) and has a molecular weight distribution of less than 1.2: In Formula (1), Rand Rrepresent, identically or differently a divalent hydrocarbon group, and n is an integer. Rto Rrepresent, identically or differently a hydrogen atom, a monovalent hydrocarbon group, or a group represented by Formula (2): In Formula (2), m and s represent, identically or differently an integer of 1 or greater. 2m occurrences of Rrepresent, identically or differently a hydrogen atom, an alkyl group, or an alkoxy group. Note that at least two of the groups represented by Rto Rare represented by Formula (2):

Polyester polyol and polyurethane

Provided are a composition capable of forming a cured product with excellent hardness, scratch resistance, chemical resistance, and flexibility; and a polyisocyanate compound that can be used as a curing agent for the composition. The polyisocyanate compound is represented by Formula (1), wherein Rto Rare identical or different and are a group represented by Formula (1a), wherein Land Lare identical or different and represent an alkylene group having from 1 to 10 carbons, m represents a number of 0 or greater, Lrepresents a divalent hydrocarbon group having from 4 to 18 carbons, and X represents an isocyanate group or a blocked isocyanate group blocked with a blocking agent, where m is not simultaneously 0 for Rto R, and the bond with the wavy line bonds to a nitrogen atom in Formula (1). In addition, the composition contains a polyisocyanate compound and a polyacrylic polyol.

Polyisocyanate compound, polyurethane resin forming composition using same, and cured product of said composition

A seal for an endless track has a cross section having a centerline parallel to an axis of the seal and a configuration symmetric with respect to the centerline of the cross section. The seal can include an elastically deformably configured portion having a cross section like alphabetical letter X, and a protrusion extending from an intersection of legs of letter X in a bushing-side direction further than a plane connecting bushing-side end portions of the legs of letter X. The protrusion has an end surface where the protrusion contacts the bushing. The seal can further include an embedding portion embedded in a space between legs of letter X, on a bushing-side of the intersection of the legs of letter X.

Seal for an endless track

An A/D converter includes first to N stages of A/D conversion units, which are connected in series, each A/D conversion unit converting an analog input signal into a digital output signal. Each of the A/D conversion units includes a) a sample-and-hold circuit, which holds an analog input signal; b) a selector which selects one from a plurality of reference voltage signals in accordance with a digital output signal outputted from the one stage preceding A/D conversion unit; and c) a comparator which compares an output signal supplied from the sample-and-hold circuit with the reference voltage signal selected by the selector.

Analog to digital converter selecting reference voltages in accordance with feedback from prior stages

An analog signal input circuit having sample-hold circuit that is constituted by a switched capacitor amplifier for which the gain is controlled according to the capacitance ratio of the plurality of capacitors connected with a switch group, for which the opening and closing is controlled according to the amplification rate setting command. The clamping voltage of a clamping circuit included in the analog signal input circuit is established in compliance with an amplification rate setting command.

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Tokyo, Japan

Takashi Konno