High density para-aramid papers

Details High density para-aramid papers High density para-aramid papers

D - Textiles, Paper

21

H

9/56

D21H 13/26 (2006.01) H05K 1/03 (2006.01)

Patent

CA 1261109

TITLE High Density Para-Aramid Papers ABSTRACT OF THE DISCLOSURE High density para-aramid papers comprising 5 to 25 percent, by weight, binder and an amount of para-aramid fibers selected from the group consisting of para-aramid pulp, para-aramid floc and mixtures thereof, compacted to provide a volume percent para-aramid fiber of at least 53 minus 0.13 times the volume percent floc in the paper are useful in the preparation of circuit board substrates having a low coefficient of thermal expansion.

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