Provided is a prepreg including: a fiber layer containing unidirectionally arranged carbon fibers impregnated with a first thermosetting resin; and a resin layer disposed on at least one side of the fiber layer and containing a second thermosetting resin and a thermoplastic resin that is insoluble in the second thermosetting resin. The prepreg is configured such that the areal weight of fibers and the weight fraction of resin in the prepreg are 120 to 300 g/m.sup.2 and 25 to 50 mass %, respectively, and in the case where a plurality of prepregs are laid up, and the coefficient of interlayer friction is measured every 10° C. in a temperature range of 40 to 100° C. at a pull-out speed of 0.2 mm/min under a perpendicular stress of 0.8 bar, the temperature at which the coefficient of interlayer friction is 0.02 or less is present within a temperature range of 40 to 100° C. The prepreg exhibits high impact strength when formed into a fiber-reinforced plastic suitable for an aircraft structural member, and the prepreg also has excellent drapeability when a prepreg laminate is made to conform to a three dimensional shape.

Provided are tubular carbon fiber reinforced composite material and having excellent cylindrical bending strength and a golf club shaft using the same. This tubular carbon fiber reinforced composite material is formed by laminating and curing a straight layer and a bias layer. The straight layer comprises carbon fibers S coated with a sizing agent S and arranged in parallel in a direction of −20° to +20° with respect to the axis of the tubular body, and contains a thermosetting resin S. The bias layer comprises carbon fibers B coated with a sizing agent B and arranged in parallel in a direction of +25° to +65° with respect to the axis of the tubular body, and contains a thermosetting resin B. The carbon fiber reinforced composite material constituting the bias layer has an interlaminar shear strength of not less than 110 MPa. A cured product of the thermosetting resin S has an elastic modulus of not less than 4.0 GPa.

Provided are tubular carbon fiber reinforced composite material and having excellent cylindrical bending strength and a golf club shaft using the same. This tubular carbon fiber reinforced composite material is formed by laminating and curing a straight layer and a bias layer. The straight layer comprises carbon fibers S coated with a sizing agent S and arranged in parallel in a direction of −20° to +20° with respect to the axis of the tubular body, and contains a thermosetting resin S. The bias layer comprises carbon fibers B coated with a sizing agent B and arranged in parallel in a direction of +25° to +65° with respect to the axis of the tubular body, and contains a thermosetting resin B. The carbon fiber reinforced composite material constituting the bias layer has an interlaminar shear strength of not less than 110 MPa. A cured product of the thermosetting resin S has an elastic modulus of not less than 4.0 GPa.

The present invention provides a silicone skeleton-containing polymer including a silicone skeleton shown by the following formula (1) and having a weight average molecular weight of 3,000 to 500,000.

##STR00001##

This can provide a silicone skeleton-containing polymer that can easily form a fine pattern with a large film thickness, and can form a cured material layer (cured film) that is excellent in various film properties such as crack resistance and adhesion properties to a substrate, electronic parts, and a semiconductor device, particularly a base material used for a circuit board, and has high reliability as a film to protect electric and electronic parts and a film for bonding substrates; and a photo-curable resin composition that contains the polymer, a photo-curable dry film thereof, a laminate using these materials, and a patterning process.

The present invention provides a silicone skeleton-containing polymer including a silicone skeleton shown by the following formula (1) and having a weight average molecular weight of 3,000 to 500,000.

##STR00001##

This can provide a silicone skeleton-containing polymer that can easily form a fine pattern with a large film thickness, and can form a cured material layer (cured film) that is excellent in various film properties such as crack resistance and adhesion properties to a substrate, electronic parts, and a semiconductor device, particularly a base material used for a circuit board, and has high reliability as a film to protect electric and electronic parts and a film for bonding substrates; and a photo-curable resin composition that contains the polymer, a photo-curable dry film thereof, a laminate using these materials, and a patterning process.

A resin composition constituted by containing an epoxy resin monomer having a mesogenic structure, a novolac resin containing a compound having a structural unit represented by the following general formula (I), and an inorganic filler is superior in preservation stability before curing, and can attain high thermal conductivity after curing.

In the following general formula (I), R.sup.1, R.sup.2 and R.sup.3 independently represent a hydrogen atom, an alkyl group, an aryl group, or an aralkyl group; m represents an integer of 0 to 2; and n an integer of 1 to 7.

##STR00001##

A resin composition constituted by containing an epoxy resin monomer having a mesogenic structure, a novolac resin containing a compound having a structural unit represented by the following general formula (I), and an inorganic filler is superior in preservation stability before curing, and can attain high thermal conductivity after curing.

In the following general formula (I), R.sup.1, R.sup.2 and R.sup.3 independently represent a hydrogen atom, an alkyl group, an aryl group, or an aralkyl group; m represents an integer of 0 to 2; and n an integer of 1 to 7.

##STR00001##

A resin composition constituted by containing an epoxy resin monomer having a mesogenic structure, a novolac resin containing a compound having a structural unit represented by the following general formula (I), and an inorganic filler is superior in preservation stability before curing, and can attain high thermal conductivity after curing.

In the following general formula (I), R.sup.1, R.sup.2 and R.sup.3 independently represent a hydrogen atom, an alkyl group, an aryl group, or an aralkyl group; m represents an integer of 0 to 2; and n an integer of 1 to 7.

##STR00001##

The invention relates to a mixture of at least one dialkylphosphinic acid of the formula (I)

##STR00001##

in which R.sup.1, R.sup.2 are the same or different and are each C.sub.1-C.sub.18-alkyl, C.sub.2-C.sub.18-alkenyl, C.sub.6-C.sub.18-aryl, C.sub.7-C.sub.18-alkylaryl, with at least one different dialkylphosphinic acid of the formula (II)

##STR00002##

in which R.sup.3, R.sup.4 are the same or different and are each C.sub.1-C.sub.18-alkyl, C.sub.2-C.sub.18-alkenyl, C.sub.6-C.sub.18-aryl and/or C.sub.7-C.sub.18-alkylaryl, with the proviso that at least one of the R.sup.3 and R.sup.4 radicals is different than R.sup.1 and R.sup.2.

The invention relates to a mixture of at least one dialkylphosphinic acid of the formula (I)

##STR00001##

in which R.sup.1, R.sup.2 are the same or different and are each C.sub.1-C.sub.18-alkyl, C.sub.2-C.sub.18-alkenyl, C.sub.6-C.sub.18-aryl, C.sub.7-C.sub.18-alkylaryl, with at least one different dialkylphosphinic acid of the formula (II)

##STR00002##

in which R.sup.3, R.sup.4 are the same or different and are each C.sub.1-C.sub.18-alkyl, C.sub.2-C.sub.18-alkenyl, C.sub.6-C.sub.18-aryl and/or C.sub.7-C.sub.18-alkylaryl, with the proviso that at least one of the R.sup.3 and R.sup.4 radicals is different than R.sup.1 and R.sup.2.