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AssigneesE. I. Du Pont de Nemours and Company, Mishima Paper Co., Ltd.
InventorsIppei Kato, Yuji Kimura, Lee James Hesler
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Aramid paper with high surface smoothness is offered, wherein [said aramid paper] is characterized by the fact that a surface layer, which contains 100 wt % of poly(metaphenylene isophthalamide) fibrids, which weighs less than 10 g/m.sup.2, and which has a coating ratio of 97% or higher, and an intermediate layer, which comprises 70 to 90 wt % of poly(metaphenylene isophthalamide) fibrids and 10 to 30 wt % of poly(metaphenylene isophthalamide) flocks and weighs 20 g/m.sup.2 or less, are laminated successively on at least one side of the substrate layer which comprises 25 to 60 wt % of said fibrids and 40 to 75 wt % of said flocks, that the surface smoothness of the surface layer is 40 sec per 10 cc or higher, and that the number of fuzz fibers at least 1 mm long, which are generated by surface friction, does not exceed 5 fibers per 25 cm.sup.2. Said aramid paper can be suitably used as electrical insulation paper, heat-resistant labeling paper, heat resistant paper, and the like.
An aramid paper with high surface smoothness comprising a substrate layer having laminated on at least one side of the substrate layer a surface layer wherein the weight of the surface layer is less than 10 g/m.sup.2 and wherein the surface layer consists of 100 wt % poly(metaphenylene isophthalamide) fibrids and has a coating ratio of 97% or higher and wherein the substrate layer consists of from 25 to 90 wt % poly(metaphenylene isophthalamide fibrids and from 10 to 75 wt % poly(metaphenylene isophthalamide) flock and wherein the surface layer has a surface smoothness of 40 see per 10 cc or higher and has 5 or fewer fuzz fibers of 1 mm in length or more that are generated and measured according to test method JIS-L 0823 per 25 cm.sup.2 and wherein the coating ratio is measured by image analysis and is percent of surface area ratio to the field of view that is devoid of holes.
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