Provided is a prepeg resin composition, containing: a urethane (meth)acrylate (A) that is a reaction product of polyisocyanate (a1), polyol (a2), and hydroxy alkyl (meth)acrylate (a3); and a polymerization initiator (B), as an essential component, in which the polyisocyanate (a1) is at least one polyisocyanate selected from 2,4′-diphenyl methane diisocyanate, 4,4′-diphenyl methane diisocyanate, a carbodiimide modified product of 4,4′-diphenyl methane diisocyanate, and polymethylene polyphenyl polyisocyanate, and the polyol (a2) has an aromatic-ring and an oxyalkylene structure. The prepreg resin composition of the invention is excellent in workability and molding properties, and is capable of forming a molded article excellent in various physical properties such as external appearance and heat resistance, and thus, can be preferably used in a prepreg and a molded article thereof.

Hydrogels are provided that include an antimicrobial agent and a cross-linkable urethane-based polymer (CUP). Such hydrogels may be used for the controlled-release of antimicrobial agents as well as in the manufacturing of wound dressings. Wound dressings are provided that comprise a hydrogel as defined herein.

The present invention provides an active energy ray-curable composition exhibiting high curability and having excellent offset printability when used for a printing ink, an active energy ray-curable printing ink having both excellent curability and offset printability, and a printed matter using the same. An active energy ray-curable composition includes a urethane (meth)acrylate resin (A) and a polymerization initiator (B), wherein the urethane (meth)acrylate resin (A) is produced by using an aromatic polyisocyanate (a), a hydroxyl group-containing mono(meth)acrylate (b), and a polyol (c) as essential reaction raw materials so that the ratio [(b′)/(a′)] of the number of moles (b′) of hydroxyl groups contained in the hydroxyl group-containing mono(meth)acrylate (b) to the number of moles (a′) of isocyanate groups contained in the aromatic polyisocyanate (a) is within a range of 0.99 to 0.40, and the urethane (meth)acrylate resin (A) has a (meth)acryloyl group concentration within a range of 1.5 to 4.0 mmol/g.

Described herein are coated optical fibers including an optical fiber portion, wherein the optical fiber portion includes a glass core and cladding section that is configured to possesses certain mode-field diameters and effective areas, and a coating portion including a primary and secondary coating, wherein the primary coating is the cured product of a composition that possesses specified liquid glass transition temperatures, such as below −82° C., and/or a viscosity ratios, such as between 25° C. and 85° C., of less than 13.9. Also described are radiation curable coating compositions possessing reduced thermal sensitivity, methods of coating such radiation curable coating compositions to form coated optical fibers, and optical fiber cables comprising the coated optical fibers and/or radiation curable coating compositions elsewhere described.

Described herein is a process for preparing urethane (meth)acrylates. In a first step, a hydroxyalkyl (meth)acrylate is reacted with a lactone (B) in the presence of at least one zinc compound and/or bismuth compound (C) to produce a resulting zinc-containing product and/or a bismuth-containing product, and, in a further step, the zinc-containing product and/or the bismuth-containing product is reacted with at least one cycloaliphatic or asymmetric aliphatic diisocyanate (D).

An active energy ray-curable resin composition which contains (A) inorganic oxide particles each having an organic functional group on the surface, (B) a siloxane oligomer which has at least one functional group selected from the group consisting of a (meth)acryloyl group, an epoxy group and a vinyl group, while having a weight average molecular weight of 200-3,000, (C) a polyfunctional (meth)acrylate having a specific structure, (D) a urethane (meth)acrylate having two or more (meth)acryloyl groups in each molecule, and (E) an ultraviolet absorbent.

A high-recoverability resin particles having a mean particle size of 1 to 100 μm containing a crossdinked (meth)acrylic acid ester-based resin, wherein the high-recoverability resin particles have a recovery rate of 22% or greater, and a 30% compression strength of 1.5 to 5.0 kgf/mm.sup.2.

A high-recoverability resin particles having a mean particle size of 1 to 100 μm containing a crossdinked (meth)acrylic acid ester-based resin, wherein the high-recoverability resin particles have a recovery rate of 22% or greater, and a 30% compression strength of 1.5 to 5.0 kgf/mm.sup.2.

The radiation curable compositions (I) that comprise from 10 to 80 by weight of at least one silicone-modified urethane (meth) acrylate (A), from 0.5 to 60 by weight of at least one (meth) acrylated compound (B) bearing at least 5 (meth) acryloyl groups per molecule, and optionally, from 10 to 60% by weight of at least one compound (C) different from (A) or (B), wherein the weight percentages are on the total weight of the composition (I). These materials can be used for producing coatings, inks and overprint varnishes with excellent anti-stain properties, to their use and preparation. Materials of the invention are compatible with standard radiation curable materials. They allow to obtain excellent anti-stain properties for high gloss coatings as well as for matte coatings (II) with a gloss level at 60° of at most 15, even at most 10.

Hydrogels are provided that include an antimicrobial agent and a cross-linkable urethane-based polymer (CUP). Such hydrogels may be used for the controlled-release of antimicrobial agents as well as in the manufacturing of wound dressings. Wound dressings are provided that comprise a hydrogel as defined herein.