Abstract: It is an object of the present disclosure to provide a method for efficiently and economically producing a polythioether compound by performing a ring-opening polymerization of an alicyclic episulfide compound. The present disclosure provides a method for producing a polythioether compound, the method including performing a ring-opening polymerization of an alicyclic episulfide compound in the presence of a base. The base is preferably an amine compound. Further, the base is preferably a strong base.

Abstract: Provided is an epoxy-amine adduct. The epoxy-amine adduct is a compound that may be a compound I containing two or more amino groups per molecule, a compound corresponding to the compound I, except being modified with a compound II-1 containing two or more (meth)acryloyl groups per molecule, a compound corresponding to the compound I, except being modified with a lactone II-2, or a salt of the compound I. The compound I is an adduct between an epoxide (A) containing two or more cycloaliphatic epoxy groups per molecule and an amine (B) containing two or more amino groups per molecule. The compound I includes a constitutional unit represented by Formula (I) and a constitutional unit represented by Formula (II) and contains amino groups at both ends.

Abstract: Provided is an epoxy-amine adduct that offers high reactivity, contributes to better adhesion between a resin and a reinforcing fiber in a fiber-reinforced composite material, and can be easily blended with another component such as a resin. The epoxy-amine adduct has two or more amino groups per molecule and is obtained by a reaction of an epoxy compound (A) having two or more alicyclic epoxy groups per molecule with an amine compound (B) having two or more amino groups per molecule.

Abstract: Provided is a compound that contributes to better adhesion between resins and additive materials in polymer composites and is readily blendable with another component such as a resin. Related is an epoxy-amine adduct. The epoxy-amine adduct is a compound selected from the group consisting of a compound I containing two or more amino groups per molecule, a compound corresponding to the compound I, except being modified with a compound II-1 containing two or more (meth)acryloyl groups per molecule, a compound corresponding to the compound I, except being modified with a lactone II-2, and a salt of the compound I. The compound I is an adduct between an epoxide (A) containing two or more cycloaliphatic epoxy groups per molecule and an amine (B) containing two or more amino groups per molecule. The compound I includes a constitutional unit represented by Formula (I) and a constitutional unit represented by Formula (II) and contains amino groups at both ends.

Abstract: Provided is an epoxy-amine adduct that offers high reactivity, contributes to better adhesion between a resin and a reinforcing fiber in a fiber-reinforced composite material, and can be easily blended with another component such as a resin. The epoxy-amine adduct has two or more amino groups per molecule and is obtained by a reaction of an epoxy compound (A) having two or more alicyclic epoxy groups per molecule with an amine compound (B) having two or more amino groups per molecule.

Abstract: Provided is an epoxy-amine adduct that offers high reactivity, contributes to better adhesion between a resin and a reinforcing fiber in a fiber-reinforced composite material, and can be easily blended with another component such as a resin. The epoxy-amine adduct has two or more amino groups per molecule and is obtained by a reaction of an epoxy compound (A) having two or more alicyclic epoxy groups per molecule with an amine compound (B) having two or more amino groups per molecule.

Abstract: An object of the present invention is to provide an epoxy resin composition which has properties and viscosity to be easily controlled, can be cured at a low temperature in a short time, and can provide a cured product having excellent mechanical characteristics such as high tensile elongation at break, and high heat resistance, and a cured product of the epoxy resin composition (resin cured product). An epoxy resin composition of the present invention contains: an alicyclic epoxy compound (A); at least one compound (B) selected from the group consisting of a lactone adduct compound having a hydroxy group (B1) and a polycarbonate polyol (B2); and a phenol resin (C). Preferably, the epoxy resin composition of the present invention further contains a curing catalyst (D).

Abstract: Disclosed is a liquid curable epoxy resin composition which includes a cycloaliphatic epoxy compound (A) having at least one alicyclic skeleton and two or more epoxy groups per molecule; a silica (B); and a phosphite ester (C). The liquid curable epoxy resin composition preferably includes, for example, 5 to 80 parts by weight of the cycloaliphatic epoxy compound (A) having at least one alicyclic skeleton and two or more epoxy groups per molecule; 20 to 95 parts by weight of the silica (B); and 0.001 to 5.0 parts by weight of the phosphite ester (C), per 100 parts by weight of the total amount of the components (A) and (B).

Abstract: Disclosed is a liquid thermosetting epoxy resin composition including a base resin, a curing agent (D), and curing accelerator (E) or including a base resin and a curing catalyst (D?), each base resin including an alicyclic epoxy compound (A) having at least one alicyclic skeleton and two or more epoxy groups per molecule; a polyester polyol and/or a polycarbonate polyol (B), each polyol having two or more terminal hydroxyl groups; and a phosphorous ester (C). The liquid thermosetting epoxy resin composition exhibits excellent viscosity stability and can give a cured article which is homogeneous even when having a large thickness, does not crack under heat cycle conditions, and is highly thermally stable and satisfactorily optically transparent.

Abstract: It is an object of the present invention to provide a curable resin composition that forms a cured product having both high heat resistance and toughness. The curable resin composition of the present invention is a curable resin composition comprising a radical polymerizable compound (A), an alicyclic epoxy compound (B), and an acid anhydride (C), or a curable resin composition comprising a radical polymerizable compound (A), an alicyclic epoxy compound (B), and a cationic curing agent (D). These curable resin compositions preferably comprise, as the alicyclic epoxy compound (B), a compound represented by the following formula (b1): wherein X represents a single bond or a linking group (a divalent group comprising one or more atoms).

Abstract: Provided is a curable resin composition capable of forming a highly heat-resistant cured product. The curable resin composition includes an epoxy-amine adduct (A) and an epoxy compound (B), in which: the epoxy-amine adduct (A) has two or more amino groups per molecule and is obtained by a reaction of an epoxy compound (i) having two or more alicyclic epoxy groups per molecule with an amine compound (ii) having two or more amino groups per molecule; and the epoxy compound (B) is other than the epoxy compound (i) and has two or more epoxy groups per molecule.

Abstract: Provided is an epoxy-amine adduct that offers high reactivity, contributes to better adhesion between a resin and a reinforcing fiber in a fiber-reinforced composite material, and can be easily blended with another component such as a resin. The epoxy-amine adduct has two or more amino groups per molecule and is obtained by a reaction of an epoxy compound (A) having two or more alicyclic epoxy groups per molecule with an amine compound (B) having two or more amino groups per molecule.

Abstract: Disclosed is a liquid curable epoxy resin composition which includes a cycloaliphatic epoxy compound (A) having at least one alicyclic skeleton and two or more epoxy groups per molecule; a silica (B); and a phosphite ester (C). The liquid curable epoxy resin composition preferably includes, for example, 5 to 80 parts by weight of the cycloaliphatic epoxy compound (A) having at least one alicyclic skeleton and two or more epoxy groups per molecule; 20 to 95 parts by weight of the silica (B); and 0.001 to 5.0 parts by weight of the phosphite ester (C), per 100 parts by weight of the total amount of the components (A) and (B).

Abstract: Disclosed is a liquid thermosetting epoxy resin composition including a base resin, a curing agent (D), and curing accelerator (E) or including a base resin and a curing catalyst (D?), each base resin including an alicyclic epoxy compound (A) having at least one alicyclic skeleton and two or more epoxy groups per molecule; a polyester polyol and/or a polycarbonate polyol (B), each polyol having two or more terminal hydroxyl groups; and a phosphorous ester (C). The liquid thermosetting epoxy resin composition exhibits excellent viscosity stability and can give a cured article which is homogeneous even when having a large thickness, does not crack under heat cycle conditions, and is highly thermally stable and satisfactorily optically transparent.

Abstract: A polyester-series resin composition comprises (A) a polyester block copolymer, (B) a polyepoxy compound and (C) a polycarbodiimide compound. The copolymer (A) is obtainable by a reaction of (a1) a crystalline aromatic polyester and (a2) a lactone, and if necessary (a3) at least one compound selected from the group consisting of a polycarboxylic acid or an ester-formable derivative thereof and a polyol or an ester-formable derivative thereof in the presence of an acidic phosphate ester and a tin compound. Such a resin composition is particularly excellent in recycling efficiency (or thermal cycling resistance) and is useful for blow molding.

Abstract: Disclosed is a method which produces a polyester block copolymer by continuously feeding a molten crystalline aromatic polyester (A) through a gear pump and lactone (B1) or a lactone composition (B2) through a metering pump into a static mixer respectively at constant rates; and carrying out a reaction between the two components to give the polyester block copolymer. In this method, the crystalline aromatic polyester (A) is preferably fed so as to give an inlet pressure of the gear pump of 0.0098 MPa (gauge pressure) or more, and the charge pressure of the lactone (B1) or the lactone composition (B2) is preferably controlled to be 1.96 MPa (gauge pressure) or more. According to the method, a polyester block copolymer with constant quality can be industrially efficiently produced through the reaction of a crystalline aromatic polyester with a lactone.

Abstract: A polyester-series resin composition comprises (A) a polyester block copolymer and (C) a polycarbodiimide compound, and if necessary (B) a polyepoxy compound. The copolymer (A) is obtainable by reaction of (a1) a crystalline aromatic polyester and (a2) a lactone, and if necessary (a3) at least one compound selected from the group consisting of a polycarboxylic acid or an ester-formable derivative thereof and a polyol or an ester-formable derivative thereof in the presence of a phosphorous ester. Such a resin composition is particularly excellent in recycling efficiency and is useful for blow molding. The resin composition has a high hydrolysis resistance and an excellent heat resistance (particularly thermal cycling resistance).

Abstract: This invention relates to aliphatic polyesters having a controlled thermal decomposition, hydrolizability, and biodegradability, in which OH terminals and COOH terminals are decreased through a ring-opening polymerization of a lactone and lactide by a mono alcohol or a metal alkoxide, or by decreasing both terminals through combining polymer terminals with diisocyanate. From a composition containing the polyesters, this invention provides a controlled release composition for agriculture.

Abstract: This invention relates to aliphatic polyesters having a controlled thermal decomposition, hydrolizability, and biodegradability, in which OH terminals and COOH terminals are decreased through a ring-opening polymerization of a lactone and lactide by a mono alcohol or a metal alkoxide, or by decreasing both terminals through combining polymer terminals with diisocyanate. From a composition containing the polyesters, this invention provides a controlled release composition for agriculture.

Abstract: The present invention relates to a polyester block copolymer composition which is obtained by reacting 0.5 to 5.0 parts by weight of an epoxy compound (C) having two or more functionalities with 100 parts by weight of a polyester block copolymer (P) having an acid value of 0 to 5 mgKOH/g obtained by reacting a crystalline aromatic polyester (A) having a hydroxyl group at a molecular terminal with a lactone (B) and optionally with a polyfunctional compound (D) having three or more groups selected among carboxyl, hydroxyl, and/or ester groups thereof. The composition has such excellent moldability that it is applicable to molding techniques including blow molding without arousing any trouble. It is satisfactory in heat resistance, water resistance, impact resistance, or flame retardancy, and has rubber-like elasticity.