San-Ei Kagaku Co., Ltd.

Yasuhiro Takase

Kazunori Kitamura

Kazuki Hanada

Hiroshi Asami

A heat curable resin composition which allows voids to be removed by heating and vacuum operation after reflow soldering, and a circuit board with an electronic component mounted thereon are provided. The heat curable resin composition of the present embodiment includes a liquid epoxy resin, a hemiacetal ester derived from monocarboxylic acid and polyvinyl ether, a curing agent, and a filler.

Heat curable resin composition, and circuit board with electronic component mounted thereon

The present invention provides a solder bump formation resin composition which ensures resist (e.g., dry film) removability and which exhibits excellent solder bonding performance, even when the working substrate is placed at high temperature during reflowing, baking, or a similar process. The solder bump formation resin composition contains (A) at least one species selected from among an alkali-dissoluble thermoplastic resin having an acid value (mgKOH/g) of 110 or higher, an unsaturated fatty acid polymer having an acid value of 80 or higher, and an unsaturated fatty acid-aliphatic unsaturated compound copolymer having an acid value of 50 or higher; (B) a solvent; and (C) a solder powder, and contains no activating agent.

Resin composition for solder bump formation, solder bump formation method, and member having solder bumps

A surface mounting method includes applying an active resin composition to at least part of a surface of a printed wiring substrate; mounting a surface mount device on the substrate; performing reflow soldering; applying an under-filling resin into a space of interest; before and/or after applying the under-filling resin, performing a vacuum treatment and/or heating at a temperature lower than the curing reaction-initiating temperature of any of the applied active resin composition and the under-filling resin; and subsequently, thermally curing the resin composition and the under-filling resin. The active resin composition contains an epoxy resin in an amount of 100 parts by weight, a blocked carboxylic acid compound in an amount of 1-50 parts by weight and/or a carboxylic acid compound in an amount of 1-10 parts by weight, and a curing agent which can initiate curing reaction at 150&#xb0; C. or higher, in an amount of 1-30 parts by weight.

Surface mounting method utilizing active resin composition

Activated resinous composition contains, on the basis of epoxy resin being solid at a room temperature of 100 parts by weight, carboxylic acid compound of 1 to 10 parts by weight, hardening agent of 1 to 30 parts by weight, a hardening reaction initiation temperature of said hardening agent being 150&#xb0; C. or higher, and solvent of 10 to 300 parts by weight.

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Saitama, Japan

Yasuhiro Takase