A problem to be solved by the present invention is to provide a prepreg and an integrally molded article, wherein the prepreg exhibits suitable flexibility and adhesiveness, excels in formability on a complicated mold face and adhesion to a mold face, causes no positional shift, and can be efficiently reinforced and stiffened at an intended position. A main object of the present invention is to provide a prepreg including (A) reinforcing fibers, (B) a thermosetting resin, and (C) a thermoplastic resin, wherein the (C) thermoplastic resin exists in at least a part of a face of the prepreg, and wherein the prepreg satisfies the condition [I], and satisfies the condition [II] or the condition [III]: [I]: the (B) thermosetting resin has a peak in the temperature range of more than 100 C. and 180 C. or less on a loss tangent (tan ) curve measured under isokinetic heating by dynamic mechanical analysis (DMA); [II]: on a loss angle curve obtained by measuring the prepreg isothermally by dynamic mechanical analysis (DMA), the loss angle curve has a point representing the maximum value, and has a point which represents a loss angle value 5 or more smaller than the maximum value, and which is on the earlier time side of the point representing the maximum value; and [III]: even if, on the loss angle curve obtained by measuring the prepreg isothermally by dynamic mechanical analysis (DMA), the loss angle curve has a point representing the maximum value, the loss angle curve does not have a point which represents a loss angle value 5 or more smaller than the maximum value, and which is on the earlier time side of the point representing the maximum value, or the loss angle curve does not have a point representing the maximum value, and has a descendingly behaving section in which the loss angle value becomes 5 or more smaller at a slope of 1.4/minute or more.

The present invention relates to blends of poly(ether ketone ketone) (PEKK) polymers, in particular to certain blends endowed with lower melting point than traditional PEKK polymers, yet maintaining high crystallinity and rapid crystallization behaviour, which are composed of a major amount of a first nucleophilic PEKK having a first T/I ratio, and a minor amount of a second PEKK having a second T/I ratio higher than the first T/I ratio; to methods of making the same, and to uses thereof in various fields.