High density para-aramid papers
    234.
    发明授权
    High density para-aramid papers 失效
    高密度对位芳族聚酰胺纸

    公开(公告)号:US4729921A

    公开(公告)日:1988-03-08

    申请号:US775577

    申请日:1985-09-17

    Abstract: 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.

    Abstract translation: 包含5至25重量%的粘合剂和选自对位芳族聚酰胺纸浆,对位芳族聚酰胺絮凝物及其混合物的对位芳族聚酰胺纤维的高密度对位芳族聚酰胺纸,压制成提供体积百分比的对位芳族聚酰胺纸 纸的体积百分比絮体的至少53减去0.13倍的芳纶纤维可用于制备具有低热膨胀系数的电路板基材。

    Method of making laminate sheets for printed circuit boards
    240.
    发明授权
    Method of making laminate sheets for printed circuit boards 失效
    制造印刷电路板用层压板的方法

    公开(公告)号:US3972765A

    公开(公告)日:1976-08-03

    申请号:US448236

    申请日:1974-03-05

    Abstract: In preparing an epoxy resin laminate sheet by impregnating a nonwoven fabric of glass fiber with an epoxy resin to form a prepreg, laminating a predetermined number of so formed prepregs and pressing, while heating, the laminate, when the nonwoven fabric of glass fiber to be used as a substrate is treated with a liquid mixture containing a water-soluble phenol resin and a silane coupler prior to the impregnation step, a laminate sheet suitable for formation of a printed circuit board can be obtained at a low manufacturing cost. The so formed laminate sheet not only has excellent heat resistance, drilling workability and punching workability at room temperature but also is characterized by such an excellent property that when it is subjected to the boiling water treatment, the degree of reduction of electric properties such as the insulation resistance is very small and whitening of the substrate is not caused to occur.

    Abstract translation: 在通过用环氧树脂浸渍玻璃纤维无纺布以形成预浸料坯来制备环氧树脂层压片材时,在加热时层叠预定数量的这样形成的预浸料坯并加压层压体,当玻璃纤维的无纺布为 在浸渍步骤之前用作含有水溶性酚醛树脂和硅烷偶联剂的液体混合物作为基材的处理可以以低的制造成本获得适于形成印刷电路板的层压片。 如此形成的层合板不仅在室温下具有优异的耐热性,钻孔加工性和冲压加工性,而且还具有如下优异的特性:当进行沸水处理时,电性能的降低程度 绝缘电阻非常小,不会发生基板的白化。

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