C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
C03B 37/022 (2006.01) C03B 37/075 (2006.01) C03B 37/083 (2006.01) H05K 1/03 (2006.01) D04H 1/42 (2006.01) D04H 3/00 (2006.01)
Patent
CA 2311672
A nonwoven fabric constituted of high--flatness glass fibers whose cross sections have aspect ratios of 2.0 to 10 and rates of filling of 85 % or above, preferably 90 % or above. Such glass fibers have nearly rectangular cross sections and therefore can be arranged in an extremely dense state to give a nonwoven fabric which is extremely thin and has a high bulk density. The fabric can give laminates which are enhanced in the glass fiber content and improved in the surface smoothness, thus being suitably usable as the reinforcement for printed wiring boards. The glass fibers can be produced by the use of, e.g., a nozzle equipped with a tip which has a flat orifice and whose major-axis wall is partially cut out on one side.
L'invention porte sur un non tissé fait de fibres de verre extra-plates dont la section transversale présente un allongement de 2/10 et dont le taux de remplissage est de 85 % ou plus, et de préférence de 90 % ou plus. Lesdites fibres de section transversale sensiblement rectangulaire peuvent être disposées de manière très dense et former un non tissé extra-mince de forte densité. Ledit non tissé peut donner des laminés à contenue de fibres accru et à surface plus lisse utilisables comme renforts de plaquettes de circuits imprimés. Lesdites fibres peuvent par exemple être produites à l'aide de buses à orifice plat dont la paroi disposée selon l'axe principal est partiellement découpée sur un côté.
Kasai Shin
Konno Michio
Miura Yasushi
Saito Shoichi
Gowling Lafleur Henderson Llp
Nitto Boseki Co. Ltd.
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