摘要:
A cyanate resin composition comprising as essential components a cyanate compound represented by formula (1) or its prepolymer and a curing agent: ##STR1## wherein each of R.sub.1 and R.sub.2 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms; A represents an alkyl group having 1 to 3 carbon atoms; i represents an integer of 0 to 3 alone or together with a brominated epoxy compound or a maleimide compound or its prepolymer, said cyanate resin composition giving a cured product having a low-dielectric constant, and a copper-clad laminate composed of a prepreg of said cyanate resin composition and a copper foil.
摘要:
A cyanate resin composition suitable for a copper-clad laminate comprises components (A) and (B).(A) a cyanate compound of the formula: ##STR1## wherein R and Q each represents halogen, C.sub.1-10 alkyl, C.sub.5-7 cycloalkyl or C.sub.6-20 hydrocarbon; i and j each represents 0-4 and M is (2): ##STR2## wherein T represents halogen, C.sub.1-10 alkyl, C.sub.5-7 cycloalkyl or C.sub.6-20 hydrocarbon; k represents 0-10 and m represents 0-8, and(B) a hardener.
摘要:
An ester compound prepared by esterifying at least one OH group of a polyhydric phenol as a condensation product of a non-substituted or substituted resorcinol and a carbonyl compound with an organic carboxylic acid having 1 to 20 carbon atoms or a derivative thereof, which necessarily contain an organic carboxylic polyacid having 1 to 20 carbon atoms or a derivative thereof. The ester compound can be used as an epoxy resin curing agent affording a cured article having low dielectric constant, low moisture absorption and sufficient heat resistance.
摘要:
A holding member includes a base section, a pair of leg sections, and inclined sections positioned along tip portions of the pair of leg sections. The base section is plate-like shape. The pair of leg sections extend in approximately equal directions to each other, and are configured to fit into a through hole of an electronic circuit board and contact an inner surface of the through hole. The inclined sections are positioned along respective tip portions of the pair of leg sections and extend in directions approaching each other and facing in opposite directions, while being inclined relative to a width direction of the base section. Furthermore, the inclined sections contact and press each other so that a tip of at least one of the pair of leg sections advances along the axis which is angled relative to the width direction of the base section when the pair of leg sections are pushed into the through hole and contact the inner surface of the through hole.
摘要:
A monitoring apparatus for monitoring communication configurations of a plurality of client devices connected to a server, the monitoring apparatus includes: a processor for controlling the communications between the client devices and the server in accordance with a process including: receiving from each of the client devices communication condition information and storing latest communication condition information of each of the client devices; determining at a time interval whether any of client devices became incapable of communication with the server by checking the latest communication condition information of each of client devices; and upon detection of at least one of the client devices for which obsolete communication condition information is stored, issuing a notice indicating that the at least one of the client devices are incapable of communication with the server.
摘要:
An electrical connector includes a connector housing having a contact engaging section with contacts which engage mating contacts, and a wire holder holding wires connected to the contacts. The connector cover is capable of moving between partially engaged position and fully engaged position. The partially engaged position is the position in which a rear end of the wire holder is housed in and the fully engaged position is the position in which the rear end of the wire holder projects from a rear end opening. The connector housing has a first engaging section engaging a mating connector in the partially engaged position. The connector cover has a second engaging section engaging the first engaging section and restraining disengagement of the first engaging section from the mating connector in the fully engaged position.