Sumitomo Bakelite Company Limited

Akihiko Tobisawa

Sumiya Miyake

Mikio Ito

Tomoyoshi Honjoya

Takayoshi Masaki

Kazuhiko Shibata

A resin composition used to prepare a sheet-like prepreg by impregnating a substrate with the resin composition includes an epoxy resin that contains a naphthalene-modified epoxy resin, and a triazine-modified novolac resin. A sheet-like prepreg is formed by impregnating a substrate with the resin composition. A laminate formed using the prepreg exhibits excellent flame retardancy, solder heat resistance, and lead-free heat resistance, has a small coefficient of linear expansion in the thickness direction, and has excellent adhesion to a conductor circuit.

Resin composition, prepreg, and laminate

The present invention relates generally to resin compositions having a generally halogen-free epoxy resin that can encompass a novolak epoxy resin, a curing agent and a non-halogen flame-retardant material. For some embodiments, the curing agent can be dicyandiamide and the flame retardant can be 10-benzyl-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide. Embodiments of the current invention also relate generally to prepregs prepared from such resin compositions; and laminates prepared from such prepregs.

Resin compositions, prepregs and laminates

The present invention provides a resin composition having excellent flame retardancy without using any halogen-containing flame retardant, and prepregs and laminates using such a resin composition. More specifically, the present invention provides a flame-retardant resin composition comprising as essential components (A) an epoxy resin, (B) a curing agent and (C) a phosphorus compound containing at least as part thereof a phosphine oxide compound, a prepreg produced by impregnating this flame-retardant resin composition in a fiber base, and a laminate produced by hot-pressing a single sheet or a pile of two or more sheets of the prepreg.

Flame-retardant resin composition, and prepregs and laminates using such composition

Flame-retardant resin composition and prepreg and laminate using the same

A flame-retardant resin composition which comprises (A) 100 parts by weight of an unhalogenated epoxy resin having at least two epoxy groups in one molecule, (B) 20 to 205 parts by weight of a maleimide compound having at least one maleimido group in one molecule, (C) 20 to 65 parts by weight of a curing agent having an amino group and (D) a phosphorus compound in a proportion of 0.5 to 4.5 parts by weight in terms of phosphorus element per 100 parts by weight of a total of the components (A), (B) and (C), provided that the proportion of nitrogen element contained in the composition is 2.0 to 10.0 parts by weight per 100 parts by weight of the total composition. The above flame-retardant resin composition has a high flame retardance without adding a halogen compound and does not deteriorate the characteristics of commercial products.

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Tokyo, Japan

Akihiko Tobisawa