The present invention provides a curable composition containing a urethane-modified epoxy resin (A) as an essential component of a main agent and an acid anhydride (B) as an essential component of a curing agent, the urethane-modified epoxy resin (A) being a reaction product obtained by using a polyisocyanate compound (a1), a polyether polyol (a2), and a hydroxy group-containing epoxy resin (a3) as essential reaction materials; a cured product thereof; a fiber-reinforced composite material; a fiber-reinforced resin molded article; and a method for producing a fiber-reinforced resin molded article. The curable composition can form a cured product having excellent fracture toughness and tensile strength in the cured product.

Disclosed herein is a self-healing asphalt binder composition comprising i) an asphalt binder, ii) an oxetane substituted polysaccharide, and iii) a polyurethane, as well as asphalts comprising said self-healing asphalt binder and an asphalt mixture. Also disclosed are methods of making the self-healing asphalt binder.

An object of the present disclosure is to provide a golf ball having excellent spin performance on approach shots. The present disclosure provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film contains, as a base resin, a polyurethane obtained by a reaction between a polyisocyanate composition and a polyol composition, and the outermost layer of the paint film has tackiness of 0.294 N or more measured with a friction tester.

An object of the present disclosure is to provide a golf ball from which stains are easily removed. The present disclosure provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film contains, as a base resin, a polyurethane obtained by a reaction between a polyisocyanate composition and a polyol composition, and the outermost layer of the paint film has tackiness of less than 0.294 N measured with a friction tester.

An object of the present invention is to provide a golf ball having excellent spin performance on approach shots under a wet condition and excellent spin performance on approach shots under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film located at the outermost layer of the golf ball contains a base resin and a porous filler, the base resin contains a polyurethane obtained by a reaction between a polyisocyanate composition and a polyol composition, and the porous filler contains SiO.sub.2 in an amount of 50 mass % or more as a constituent component.

An object of the present invention is to provide a golf ball having excellent spin performance on approach shots under a wet condition and excellent spin performance on approach shots under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film located at the outermost layer of the golf ball contains a base resin and a porous filler, the base resin contains a polyurethane obtained by a reaction between a polyisocyanate composition and a polyol composition, and the porous filler contains SiO.sub.2 in an amount of 50 mass % or more as a constituent component.

An object of the present invention is to provide a golf ball having excellent approach spin performance under a dry condition and excellent approach spin performance under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, wherein the paint film is composed of at least one layer, and an outermost paint film layer located at the outermost layer of the golf ball contains, as a base resin, a polyurethane obtained by a reaction between (A) a polyisocyanate composition and (B) a polyol composition, and the outermost paint film layer has a dynamic friction coefficient of from 0.75 to 1.5 measured with a dynamic friction tester under specific conditions.

Polyurethane foams are made by curing a reaction mixture that contains an aromatic polyisocyanate, at least one isocyanate-reactive material having an average functionality of at least 2 and an equivalent weight of at least 200 per isocyanate-reactive group, at least one blowing agent, at least one surfactant and at least one catalyst, a polyethyleneamine mixture having a number average molecular weight of 175 to 450 and an alkali metal, phosphonium or ammonium sulfite. Foams so produced emit low levels of formaldehyde, acetaldehyde, acrolein and propionaldehyde.

The present invention provides a polyrotaxane for obtaining a material combining a higher degree of elongation with a higher breaking strength and/or a polyrotaxane having properties not possessed by conventional polyrotaxanes, such as compatibility with compounds to be used in a material, solubility in solvents, and functionality. The polyrotaxanes of the present invention each comprise: a pseudo-polyrotaxane comprising cyclic molecules and a linear molecule which passes through the cavities of the cyclic molecules to form a clathrate; and blocking groups disposed at both ends of the pseudo-polyrotaxane so that the cyclic molecules are not released. The cyclic molecules each include a hydroxyl-inactivation group and a hydroxyl group bonded by a spacer group. The polyrotaxanes have a hydroxyl value of 10-65 mg-KOH/g.

The present invention relates to generally relates to polyurethanes containing at least one lignin compound. In particular, the invention relates to a reactive polyurethane system comprising at least one polyol, at least one polyisocyanate and at least one lignin compound. In further aspects, the invention relates to a process for producing a polyurethane from a reactive system as disclosed, a polyurethane obtainable by such process, polyurethane adhesives, articles comprising cured polyurethane adhesives and a method for adhesive bonding.