Prepreg and method for producing same

#The present invention relates to a prepreg that is used when a fiber-reinforced composite material is produced, and a method for producing the same.

#Particularly, the present invention relates to: (1) a prepreg which facilitates production of a laminated body, and yields a fiber-reinforced composite material having very few defects such as voids by vacuum bag molding, and a method for producing the same; (2) a prepreg exhibiting different tack values depending on the pressing pressure, a method for producing the same, and a prepreg roll obtained by winding the prepreg plural turns into a roll shape to form a multilayer roll; (3) a protective film-attached prepreg in which tackiness of the prepreg surface is relatively low, but a protective film is satisfactorily adhered to the surface, and a method for producing the same; and (4) a method for producing a prepreg, including collecting the optically transmitting film used in a prepreg production process, in a state appropriate for recycling, and recycling the optically transmitting film during the production process described above.

#The present application claims priority on Japanese Application No. 2012-196671 filed in Japan on Sep. 6, 2012; Japanese Patent Application No. 2012-196672 filed in Japan on Sep. 6, 2012; Japanese Patent Application No. 2012-196673 filed in Japan on Sep. 6, 2012; and Japanese Patent Application No. 2013-179583 filed in Japan on Aug. 30, 2013, the disclosures of which are incorporated herein by reference.

#FIG. 1 is a diagram illustrating an example of the sea-island structure pattern as an exemplary pattern of the surface of the prepreg related to the first aspect of the present invention showing regions of a relatively larger content of the component (B) and regions of a relatively larger content of the component (E);

#FIG. 2 is a diagram illustrating another example of the sea-island structure pattern as an exemplary pattern of the surface of the prepreg related to the first embodiment of the present invention showing regions of a relatively larger content of the component (B) and regions of a relatively larger content of the component (E);

#FIG. 3 is a diagram illustrating an example of the striped structure pattern as an exemplary pattern of the surface of the prepreg related to the first embodiment of the present invention showing regions of a relatively larger content of the component (B) and regions of a relatively larger content of the component (E);

#Embodiments of the present invention reside in a prepreg containing reinforcing fibers and a matrix resin composition, in which the matrix resin composition includes at least component (A): an epoxy resin, component (B): a radical polymerizable unsaturated compound, and component (E): a polymer formed by radical polymerization of the component (B); and a method for producing the prepreg.

#Furthermore, according to the embodiments of the present invention, a release paper and a process peelable paper have the same meaning, and these papers and a separating film are collectively referred to as “process peelable materials”. All of them are members used at least in any one of during the production of a prepreg precursor or during the production of a prepreg; however, it does not matter whether these members are stored or transported while being laminated on a completed prepreg.

#Also, the “protective film” accomplishes the role of being laminated on a prepreg and protecting the prepreg at the time of storage or transportation; however, it does not matter whether the protective film has already been laminated on the surface of the prepreg or prepreg precursor during the prepreg production process or during the preceding prepreg precursor production process (that is, also serving as a process peelable material), or the protective film should be freshly laminated on a prepreg after completion of the production.