Prepreg, laminated board and printed wiring board

Abstract

The invention discloses a prepreg, a laminated board and a printed circuit board. The prepreg includes a halogen-free epoxy resin composition and a partially cured nonwoven reinforcing material impregnated therein. The nonwoven reinforcing material has a dielectric strength of 1.5-4.8 and a loss factor of below 0.003 at 10 GHz, and the halogen-free epoxy resin composition includes, by weight, (a)100 parts of a halogen-free naphthalene type epoxy resin, (b) 10-25 parts of a DOPO modifying hardener, (c) 25-45 parts of a cyanate ester resin, (d) 35-60 parts of bismaleimide, (e) 45-65 parts of anon-DOPO flame retardant and (f) 0.5-15 parts of a hardening accelerator. The prepreg effectively improves the delay effect, and has the characteristics of high glass transition temperature, low dielectric loss, high heat resistance and high storage modulus.

Description

technical field [0001] The invention relates to a prepreg, a laminate and a printed circuit board, in particular to a prepreg, a laminate and a printed circuit board using a halogen-free epoxy resin composition. Background technique [0002] A printed circuit board (PCB) is usually impregnated with a reinforcing material in a polymer material to form a composite material, and then further laminated (clad) with a metal layer on one or both sides of the composite material to form a composite material for the PCB. Laminates in applications. [0003] Generally reinforced materials are mostly woven glass materials, such as low dielectric constant (Dk) glass, E-type glass, R-type glass, ECR-type glass, S-type glass, C-type glass and Q-type glass, however, woven glass The glass material and the polymer material are heterogeneous materials, thus causing signal delay. This phenomenon is known as "skew" in the field of digital engineering. [0004] In addition, flame retardants cont...

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Problems solved by technology

[0003] Generally reinforced materials are mostly woven glass materials, such as low dielectric constant (Dk) glass, E-type glass, R-type glass, ECR-type glass, S-type glass, C-type glass and Q-type glass, however, woven glass The glass material and the polymer material are heterogeneous materials, resulting in signal delay, this phenomenon is known in the field of digital engineering as "skew"

[0004] In addition, flame retardants containing halogen components (especially brominated flame retardants), such as tetrabromocyclohexane, hexabromocyclodecane and 2,4,6-tri(tri Bromophenoxy)-1,3,5-triazabenzene and other halogen-containing flame retardants have the advantages of good flame retardancy and less addition. However, halogen products are used in product manufacturing, use, and even recycling Or it is easy to cause pollution to the environment when discarded. In addition, halogen-containing electronic equipment waste will produce corrosive and toxic gases and smoke when burned, and dioxins and dibenzofurans will be detected in the products after burning other carcinogens

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