摘要:
Disclosed herein are processes for the preparation of polyimide-isoindroquinazolinediones and precursor thereof. These polymers are useful as heat-resistant electric insulation materials, surface coating films for electronic instrument parts and especially suitable for manufacturing a photoresist. The above precursor is produced by reacting a an alkylenebistrimellitate dianhydride, a diaminoamide compound and the other amine. The precursor is readily dehydrated and ring-closed to produce polyimide-isoindroquinazolinedione, which is often conveniently conducted by producing a varnish of the precursor, applying it onto adequate substrates such as silicon wafers, glass plates, metal plates, etc. and then subjecting the coated film to dehydration. The resulting films have excellent physical properties such as good adherence, high tensile strength, low elasticity, etc.
摘要:
An epoxy resin composition for a copper-clad laminate comprising an epoxy resin having at least two epoxy groups in one molecule, a phenolic compound having at least two functional groups in one molecule as a hardener, an imidazole compound having a masked imino group as a hardening accelerator, and one or more of nitrogen compounds selected from the group consisting of urea derivatives represented by the formula R.sup.1 --NH--CO--NH.sub.2, wherein R.sup.1 is hydrogen or an organic group; acid amide compounds; and guanidine derivatives, which is advantageously used for the material of a copper-clad laminate. Accordingly, the copper-clad laminate is especially used for the production of printed circuit boards, and its drilling property, peeling resistance of the copper foil, adhesive property, and heat resistance are improved remarkably. In addition, this epoxy resin composition has an excellent storing stability.
摘要:
An alignment film for liquid crystal is provided which comprises a polyimide comprising a repeating unit of the general formula (I): ##STR1## wherein n is an integer of from 2 to 16 and R.sup.1 represents a divalent organic group. This polyimide is obtained for example, from a reaction between ethylene glycol bis(trimellitate dianhydride) and 4,4'-diaminodiphenyl ether. This polyimide or a varnish of a precursor thereof is coated on a plate, and dried to obtain an alignment film for liquid crystal, which stably exhibits a high pretilt angle, irrespective of curing temperatures. The present invention further provides a liquid crystal-sandwiched panel and a liquid crystal display module prepared using the alignment film as well as a material for the preparation of the alignment film.
摘要:
An adhesive film including a reactive adhesive capable of curing by heating or light irradiation and a polyphthalide represented by the formula I: wherein R represents a divalent aromatic hydrocarbon group or a divalent heteroring-containing aromatic group, R1 represents an alkyl group, a Fluorinated alkyl group, an alkoxy group or a halogen atom, where the number of R1 is 0 to 4, X represents O or N—R3, provided that R3 represents one of the following groups, Y represents SO2 or CO and n represents a number of repeating units in the polymer. The adhesive film can be used to connect, e.g., electrodes of a semiconductor chip to electrodes of a wiring board. The polyphthalide can be used to surface-treat, e.g., electrodes of a wiring board.
摘要:
A semiconductor chip is attached to a lead frame with a filmy organic die-bonding material having a water absorption of 1.5% by volume or less; having a saturation moisture absorption of 1.0% by volume or less, having a residual volatile component in an amount not more than 3.0% by weight, having a modulus of elasticity of 10 MPa or less at a temperature of 250° C. The semiconductor device thus obtained can be free from occurrence of reflow cracks during reflow soldering for the packaging of semiconductor devices.
摘要:
Provided are a laminating method and machine for successively heating and compression-bonding a film-shaped organic die-bonding material on a leadframe. leadframe 7 is placed on a travelling table 8 and is heated there. A film-shaped organic die-bonding material 2 is punched out and the resulting film is tack-bonded to a die pad on the leadframe. The leadframe with the film tack-bonded thereon is then moved to a position B by the travelling table. After the film is pressed by a compression-bonding element at the position B, a chip is mounted on the film-shaped organic die-bonding material 2. It is therefore possible to bond a film-shaped organic die-bonding material under compression on a leadframe with good productivity but without voids and further to avoid package cracking upon mounting a chip.
摘要:
A semiconductor chip is attached to a lead frame with a filmy organic die-bonding material having a water absorption of 1.5% by volume or less; having a saturation moisture absorption of 1.0% by volume or less, having a residual volatile component in an amount not more than 3.0% by weight, having a modulus of elasticity of 10 Mpa or less at a temperature of 259° C. The semiconductor device thus obtained can be free from occurrence of reflow cracks during reflow soldering for the packaging of semiconductor devices.
摘要:
A laminating method and a machine are provided for successively heating and compression-bonding a film-shaped organic die-bonding material on a leadframe with good productivity but without voids and further to avoid package cracking upon mounting a chip. A leadframe 7 is placed on a travelling table 8 and is heated there. A film-shaped organic die-bonding material 2 is punched out and the resulting film is tack-bonded to a die pad on the leadframe. The leadframe with the film tack-bonded thereon is then moved to a position b by the travelling table. After the film is pressed by a compression-bonding element at the position B, a chip is mounted on the film-shaped organic die-bonding material 2.
摘要:
Described is an electrically conductive bonding film useful in bonding an IC or LSI with a lead frame. The film comprises (A) a polyimide resin obtained by reacting a tetracarboxylic dianhydride component, in which the content of a tetracarboxylic dianhydride represented by the following formula (I): ##STR1## wherein n stands for an integer of 2-20 amounts to at least 70 mole %, with a diamine; (B) an electrically conductive filler, and a thermoset resin. Optionally, the film may further comprises a thermosetting resin or an imide compound having at least two thermally-crosslinking imido groups per molecule.
摘要:
The present invention relates to a method for connecting electrodes comprising: interposing the polyphthalide represented by the formula (I): wherein R represents a divalent aromatic hydrocarbon group or a divalent heteroring-containing aromatic group, R1 represents an alkyl group, a fluorinated alkyl group, an alkoxy group or a halogen atom, where the number of R1 is 0 to 4, X represents O or N—R3, provided that R3 represents one of the following groups, Y represents SO2 or Co and n represents a number of repeating units in the polymer, as a pressure-sensitive conductive polymer at least partially between electrodes opposed to each other; and applying a pressure to fix the both electrodes, a surface-treated wiring board comprising polyphthalide represented by the formula (I) formed on at least part of the surface of the electrode part, an adhesive film comprising an adhesive and polyphthalide represented by the formula (I), and an electrode-connected structure using the same.