[OF THE INVENTION] the present invention, is excellent in heat resistance, the electronic component, for a printed wiring board laminates and printed wiring board, the semiconductor sealing material, the semiconductor-mounted module such as an electronic material, an automobile, vehicle, aircraft, building, machine or the like used in the heat-curable composition and its cured product related.The present invention is also, the thermosetting composition of the prepreg, a metal-clad laminate, on the printed wiring board.[Prior art] a thermosetting resin composition is used, light weight, low cost, in addition to the characteristics of the plastics such as mass productivity, stability at high temperatures, excellent reliability in various fields of industry has been widely used. However the commercial actually used a thermosetting resin, a phenol resin, melamine resin, urea resin, epoxy resin or the like is limited to a few, the function of these exclusively depending on the contribution of the additive or the filler. Of the resin itself as a means for a high function, and a complex structure of the so-called superengineering are known to be effective, the degree of a high function for substantially proportional to the amount of these additives, in order to improve the characteristics of the sufficient large amount of expensive superengineering means must be used and they are commercially available.Recently, a compound having a dihydrobenzoxazine ring the use of a ring opening polymerization reaction of a thermosetting resin which has been found, high heat resistance, flame retardancy, high mechanical strength of a cured product of a report that can be obtained. For example, Journal of P olymer Science: Part B: Polymer Physics, Vol. 32, 92 1-927 (1994) a variety of functional characteristics of a cured product of the benzoxazine compound 2, or JP-4-227922 discloses a dihydrobenzoxazine compound with an epoxy resin and the resin composition, the publication JP-7-188364 and Journal of Applied Polymer Science, Vol. 58, 1 751-1760 (1995) or as an additive in the molecule is a kind of the phenolic hydroxyl group by co-curing of the compound to enhance the dihydrobenzoxazine be shown.However, these studies have been reported yet dihydrobenzoxazine compound only slightly, the other resin system, particularly a high heat resistant resin of polyimide or the like complex structure of the effect is not known until now.[Problem to be solved by the invention] the present invention, the maleimide compound without a lot of expensive and complex due to the high heat resistance, high strength of a cured product having a dihydrobenzoxazine ring containing the thermosetting resin is a thermosetting composition and its cured product is intended to provide.The present invention is also, the thermosetting composition of the heat-resistant, excellent in mechanical strength to the prepreg, metal foil-clad laminate plate, the printed wiring board can be provided for the purpose.[Means for solving the problem] the inventors of the present invention in order to achieve the above object as a result of earnest studies, a thermosetting resin having a dihydrobenzoxazine ring having a small amount of maleimide ring by mixing a thermosetting resin, a thermosetting resin having a dihydrobenzoxazine ring greatly improving the characteristics of the cured product of the found, based on this knowledge and have completed the present invention.That is, the present invention having a dihydrobenzoxazine ring and maleimide ring having a thermosetting resin as an essential component and a thermosetting resin, a maleimide ring having a dihydrobenzoxazine ring content ratio of the thermosetting resin to the thermosetting resin having the thermosetting resin and maleimide ring on the total amount of 3-30 weight % in the thermosetting composition and according to the present invention.[Embodiment of the present invention] in the thermosetting composition of the present invention, the maleimide ring having a dihydrobenzoxazine ring as a thermosetting resin having a content ratio of the thermosetting resin and the maleimide ring relative to the total amount of the thermosetting resin is 3-30 weight % is necessary. Maleimide ring having a content ratio of the thermosetting resin is less than this range maleimide curing the thermosetting resin having a ring of characteristics, particularly the effect of improving the glass transition temperature is not obtained, on the other hand more than this range of specific imide resin cured product becomes obvious in the brittleness of the, the dihydrobenzoxazine ring may be made from inexpensive raw material and the thermosetting resin having the advantages of a commercial is lost. Maleimide ring having a content ratio of the thermosetting resin is more preferably in a range of 5-20 weight % is in.Used in the present invention as a thermosetting resin having a dihydrobenzoxazine r
[OF THE INVENTION] the present invention, is excellent in heat resistance, the electronic component, for a printed wiring board laminates and printed wiring board, the semiconductor sealing material, the semiconductor-mounted module such as an electronic material, an automobile, vehicle, aircraft, building, machine or the like used in the heat-curable composition and its cured product related.The present invention is also, the thermosetting composition of the prepreg, a metal-clad laminate, on the printed wiring board.[Prior art] a thermosetting resin composition is used, light weight, low cost, in addition to the characteristics of the plastics such as mass productivity, stability at high temperatures, excellent reliability in various fields of industry has been widely used. However the commercial actually used a thermosetting resin, a phenol resin, melamine resin, urea resin, epoxy resin or the like is limited to a few, the function of these exclusively depending on the contribution of the additive or the filler. Of the resin itself as a means for a high function, and a complex structure of the so-called superengineering are known to be effective, the degree of a high function for substantially proportional to the amount of these additives, in order to improve the characteristics of the sufficient large amount of expensive superengineering means must be used and they are commercially available.Recently, a compound having a dihydrobenzoxazine ring the use of a ring opening polymerization reaction of a thermosetting resin which has been found, high heat resistance, flame retardancy, high mechanical strength of a cured product of a report that can be obtained. For example, Journal of P olymer Science: Part B: Polymer Physics, Vol. 32, 92 1-927 (1994) a variety of functional characteristics of a cured product of the benzoxazine compound 2, or JP-4-227922 discloses a dihydrobenzoxazine compound with an epoxy resin and the resin composition, the publication JP-7-188364 and Journal of Applied Polymer Science, Vol. 58, 1 751-1760 (1995) or as an additive in the molecule is a kind of the phenolic hydroxyl group by co-curing of the compound to enhance the dihydrobenzoxazine be shown.However, these studies have been reported yet dihydrobenzoxazine compound only slightly, the other resin system, particularly a high heat resistant resin of polyimide or the like complex structure of the effect is not known until now.[Problem to be solved by the invention] the present invention, the maleimide compound without a lot of expensive and complex due to the high heat resistance, high strength of a cured product having a dihydrobenzoxazine ring containing the thermosetting resin is a thermosetting composition and its cured product is intended to provide.The present invention is also, the thermosetting composition of the heat-resistant, excellent in mechanical strength to the prepreg, metal foil-clad laminate plate, the printed wiring board can be provided for the purpose.[Means for solving the problem] the inventors of the present invention in order to achieve the above object as a result of earnest studies, a thermosetting resin having a dihydrobenzoxazine ring having a small amount of maleimide ring by mixing a thermosetting resin, a thermosetting resin having a dihydrobenzoxazine ring greatly improving the characteristics of the cured product of the found, based on this knowledge and have completed the present invention.That is, the present invention having a dihydrobenzoxazine ring and maleimide ring having a thermosetting resin as an essential component and a thermosetting resin, a maleimide ring having a dihydrobenzoxazine ring content ratio of the thermosetting resin to the thermosetting resin having the thermosetting resin and maleimide ring on the total amount of 3-30 weight % in the thermosetting composition and according to the present invention.[Embodiment of the present invention] in the thermosetting composition of the present invention, the maleimide ring having a dihydrobenzoxazine ring as a thermosetting resin having a content ratio of the thermosetting resin and the maleimide ring relative to the total amount of the thermosetting resin is 3-30 weight % is necessary. Maleimide ring having a content ratio of the thermosetting resin is less than this range maleimide curing the thermosetting resin having a ring of characteristics, particularly the effect of improving the glass transition temperature is not obtained, on the other hand more than this range of specific imide resin cured product becomes obvious in the brittleness of the, the dihydrobenzoxazine ring may be made from inexpensive raw material and the thermosetting resin having the advantages of a commercial is lost. Maleimide ring having a content ratio of the thermosetting resin is more preferably in a range of 5-20 weight % is in.Used in the present invention as a thermosetting resin having a dihydrobenzoxazine r<br>
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