Prepreg and molded article

• Main Authors: KIMURA, MAKOTO, YASUMURA, TAKASHI, SHINCHI, TOMOAKI
• Format: Patent
• Language: Chinese; English
• Published: 16.09.2017
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

Provided is a prepreg having as essential components a urethane-modified epoxy (meth)acrylate (A), which is the reaction product of an epoxy (meth)acrylate (a1) having an average number of hydroxyl groups of 1.8-2.6 and a polyisocyanate (a2) having an average number of isocyanate groups of 2-3, an ethylenic unsaturated monomer (B), a polymerization initiator (C), and reinforcing fibers (D), the prepreg being characterized in that the molar ratio (NCO/OH) of the isocyanate groups (NCO) of the polyisocyanate (a2) and the hydroxyl groups (OH) of the epoxy (meth)acrylate (a1) is 0.6-1.1, and the proportion of the ethylenic unsaturated monomer (B) in the total mass of the epoxy (meth)acrylate (a1) and ethylenic unsaturated monomer (B) is 10-50 mass%. This prepreg can be used suitably in various molded articles such as automotive parts because the prepreg has excellent workability and moldability and various excellent properties such as interlaminar shear strength and heat resistance.