Thermosetting resin, thermosetting resin composition containing same, cured product, prepreg, laminate, and printed circuit board
A technology of thermosetting and resin, applied in the field of thermosetting resin and thermosetting resin composition, can solve the problems of hygroscopicity, unsatisfactory electrical properties, high cost of bismaleimide resin, poor flame retardancy of epoxy resin, etc., to achieve Low water absorption, excellent heat resistance, and good electrical properties
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Embodiment 1
[0066] (1) Preparation of benzoxazine resin
[0067] 26.21 g of the mixture of multifunctional phenolic compounds represented by formula (I) and (II) represented by formula (I) and (II) in input mass ratio in chloroform is totally 26.21 g, and mass ratio is represented by formula (a) and (b) of 1 / 1 30.13 g of a mixture of diamine compounds and 8.05 g (0.25 mol) of paraformaldehyde (manufactured by Wako Pure Chemical Industries, Ltd., 94%) were reacted under reflux for 6 hours while removing generated moisture. Put the reacted solution into a large amount of methanol to precipitate the product. The product was then isolated by filtration and washed with methanol. The washed product was dried under reduced pressure to obtain 50.78 g of a thermosetting resin mainly composed of a benzoxazine compound having the following structure. Its molecular weight measured by GPC is 20500.
[0068] (2) Preparation of cured product
[0069] The polymer obtained in step (1) was kept at 220°...
Embodiment 2
[0071] (1) Preparation of benzoxazine resin
[0072]21.5 g of the mixture of polyfunctional phenolic compounds represented by formulas (I) and (II) represented by formula (I) and (II) are dropped in chloroform, and mass ratio is 2 / 1 represented by formulas (a) and (b) 66.68 g of a mixture of diamine compounds and 7.36 g (0.22 mol) of paraformaldehyde (manufactured by Wako Pure Chemical Industries, Ltd., 94%) were reacted under reflux for 6 hours while removing generated moisture. Put the reacted solution into a large amount of methanol to precipitate the product. The product was then isolated by filtration and washed with methanol. The washed product was dried under reduced pressure to obtain 91.10 g of a thermosetting resin mainly composed of a benzoxazine compound having the following structure. Its molecular weight measured by GPC is 16600.
[0073] (2) Preparation of cured product
[0074] The polymer obtained in step (1) was kept at 220° C. for 3 hours by hot pressing...
Embodiment 3
[0076] (1) Preparation of benzoxazine resin
[0077] 16.12 g of the mixture of multifunctional phenolic compounds represented by formula (I) and (II) in chloroform, 49.77 g of diamine compounds represented by formula (a), paraformaldehyde (manufactured by Wako Pure Chemical Industries, 94%) 10.64 g (0.32 mol), and reacted under reflux for 6 hours while removing the generated moisture. Put the reacted solution into a large amount of methanol to precipitate the product. The product was then isolated by filtration and washed with methanol. The washed product was dried under reduced pressure to obtain 62.32 g of a thermosetting resin mainly composed of a benzoxazine compound having the following structure. Its molecular weight measured by GPC is 17800.
[0078] (2) Preparation of cured product
[0079] The polymer obtained in step (1) was kept at 220° C. for 3 hours by hot pressing method to obtain a sheet-shaped cured product with a thickness of 0.5 mm. The obtained cured bo...
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