PRODUCTION OF PREPREG

• Main Authors: OOSETO HIROKI, OKITA HIDEKI
• Format: Patent
• Language: English
• Published: 16.02.1999
• Edition: 6
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MAKING GRANULES OR PREFORMS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PROBLEM TO BE SOLVED: To obtain a prepreg excellent in surface smoothness, handleability and resin flow, when molded, by heating a matrix resin composition comprising a thermosetting resin composition, a radically polymerizable compound and a polymerization initiator in a process for immersing reinforcing fibers in the matrix resin composition, thus allowing the polymerization reaction of the radically polymerizable unsaturated compound to proceed at the same time as the immersion. SOLUTION: This prepreg is obtained by heating a resin composition comprising 100 pts.wt. of a thermosetting resin composition (preferably a composition comprising an epoxy resin and a curing agent), 1-20 pts.wt. of a radically polymerizable unsaturated compound (e.g. triethylene glycol diacrylate), and a thermally radical-generating polymerization initiator (e.g. 2,2' azobisisobutyronitrille) at a temperature (e.g. 40-140 deg.C) substantially not causing the reaction of the thermosetting resin in the composition in the process for immersing the reinforcing fibers (preferably carbon fibers, etc.,).