Aramid paper suitable for use in electronic applications

    公开(公告)号:US11111632B2

    公开(公告)日:2021-09-07

    申请号:US16464534

    申请日:2017-11-27

    摘要: An aramid paper suitable for use in electronic applications which has a density of 0.20-0.65 g/cm3 and a grammage of 30-280 g/m2, which paper comprises 10-40 wt. % of aramid shortcut with a linear density of 2.6 dtex or lower and a length of 0.5-25 mm and 10-90 wt. % of aramid fibrid, wherein the aramid shortcut comprises at least 70 wt. % para-aramid shortcut and the aramid fibrid including at least 70 wt. % para-aramid fibrid. It has been found that the use of a paper with the above properties in electronic applications ensures a low CTE in combination with good homogeneity and a good dimensional stability resulting from good resin adhesion and penetration. Use of the aramid paper in a composite sheet including at least one layer of aramid paper and a resin, or in a substrate board for electronic applications.

    PITCH INHIBITOR, PITCH INHIBITION METHOD, AND PROCESS FOR PRODUCING DEINKED PULP
    73.
    发明申请
    PITCH INHIBITOR, PITCH INHIBITION METHOD, AND PROCESS FOR PRODUCING DEINKED PULP 审中-公开
    PITCH抑制剂,PITCH抑制方法和生产消泡浆的方法

    公开(公告)号:US20150322629A1

    公开(公告)日:2015-11-12

    申请号:US14651975

    申请日:2013-12-26

    IPC分类号: D21H17/48

    摘要: Provided are a pitch-formation suppressor and the like which can be widely applied independently of the substance that causes a pitch and of the situation to generate a pitch in a paper manufacturing process, and which can effectively suppress and prevent the troubles due to the pitch, such as foreign spots and defects in a paper, breakage of a paper, and lowering of workability. This pitch-formation suppressor comprises an alkaline solution in which a phenol resin and/or a modified phenol resin is dissolved, or an acid solution in which a phenol resin and/or a modified phenol resin is dissolved.

    摘要翻译: 提供了可以广泛应用于在造纸工艺中产生间距的情况和产生间距的物质的俯仰形成抑制器等,并且能够有效地抑制和防止由于间距产生的麻烦 ,如纸张中的外来斑点和缺陷,纸张破裂和可加工性降低。 该沥青形成抑制剂包括其中溶解有酚醛树脂和/或改性酚醛树脂的碱性溶液,或其中溶解有酚醛树脂和/或改性酚醛树脂的酸溶液。

    Resin-coated overlays for solid substrates
    75.
    发明授权
    Resin-coated overlays for solid substrates 失效
    用于固体基材的树脂涂层覆层

    公开(公告)号:US5955203A

    公开(公告)日:1999-09-21

    申请号:US318911

    申请日:1994-10-05

    摘要: There is disclosed a resin-coated overlay for bonding to solid substrates, and which imparts improved waterproofing and chemical resistance to the resulting resin-coated overlaid solid substrate. Depending upon the desired end use of resin-coated overlaid solid substrate, the resin-coating may be modified to impart desirable surface features and/or characteristics. For example, additives such as waxes, oils, silicones, fluorocarbons and fatty acid compounds may be used to promote the release of concrete from forms made of solid substrates overlaid with the resin-coated overlays of the present invention. Moreover, resin-coated overlaid solid substrates may be produced having a surface which is suitable for painting and which accepts application of various tape products. Other modifications are disclosed which can be used to gain desirable cure speed, cost, and chemical/mechanical properties in the resin-coating. In addition to variations on the resin-coated overlay, related methods are also disclosed for the production of resin-coated overlays and resin-coated overlaid solid substrates.

    摘要翻译: 公开了一种用于粘结到固体基底上的树脂涂覆的覆盖物,并且对所得到的树脂涂覆的重叠的固体基质赋予改进的防水性和耐化学性。 根据树脂涂覆的覆盖的固体基质的期望的最终用途,可以改性树脂涂层以赋予所需的表面特征和/或特性。 例如,可以使用诸如蜡,油,硅酮,碳氟化合物和脂肪酸化合物的添加剂来促进混合物从由本发明的树脂涂覆的叠层覆盖的固体基材制成的形式的释放。 此外,可以制造具有适于喷漆的表面并且接受各种胶带产品的涂布的树脂涂覆的重叠固体基材。 公开了可用于获得所需的固化速度,成本和树脂涂层中的化学/机械性能的其它修改。 除了树脂涂覆的覆盖物的变化之外,还公开了用于生产树脂涂覆的覆层和树脂涂覆的重叠固体基材的相关方法。

    Method and adjuvant composition to improve retention of particles on a
wire screen
    76.
    发明授权
    Method and adjuvant composition to improve retention of particles on a wire screen 失效
    方法和辅助剂组合物,以改善颗粒在丝网上的保留

    公开(公告)号:US5824192A

    公开(公告)日:1998-10-20

    申请号:US653646

    申请日:1996-05-24

    申请人: Georges Radu

    发明人: Georges Radu

    摘要: Disclosed is a method for the production of paper and an adjuvant composition comprising the following ingredients: 30 to 80% by weight of phenolic resin or modified phenolic resin; 10 to 50% by weight of melamine resin; and 5 to 35% by weight of at least one naphthalene sulphonate salt. The ingredients are under granulated form or dissolved in an aqueous solution. The method comprises the step of admixing the adjuvant composition with a solution of one or several polyethylene oxide having a molecular weight varying from 1.times.10.sup.6 to 13.times.10.sup.6 and with an aqueous mixture comprising lignocellulosic particles and an aqueous medium to significantly improve the retention of particles such as fines and fibers, on a wire screen and the drainage of the aqueous medium.

    摘要翻译: 公开了一种用于生产纸和助剂组合物的方法,其包含以下成分:30至80重量%的酚醛树脂或改性酚醛树脂; 10〜50重量%的三聚氰胺树脂; 和5至35重量%的至少一种萘磺酸盐。 成分呈粒状或溶于水溶液。 该方法包括将佐剂组合物与一种或多种分子量为1×10 6至13×10 6的聚环氧乙烷的溶液和含有木质纤维素颗粒和水性介质的含水混合物混合的步骤,以显着改善颗粒的保留,例如细粉 和丝网上的纤维和水性介质的排水。

    Process of making paper
    77.
    发明授权
    Process of making paper 失效
    制作纸的过程

    公开(公告)号:US5538596A

    公开(公告)日:1996-07-23

    申请号:US191930

    申请日:1994-02-04

    摘要: According to the invention, a process of making paper comprises forming a cellulosic suspension, adding retention aid to the suspension, draining the suspension through a screen to form a sheet, and drying the sheet and in this process we add to the suspension a retention system comprising polyethylene oxide and a greater amount (dry weight) of a phenolsulphone-formaldehyde resin (PSR resin) consisting essentially of recurring units of the formula--CH.sub.2 --X--wherein (a) 10 to 100% of the groups X are di(hydroxyphenyl) sulphone groups, (b) 0 to 90% of the groups X are selected from hydroxy phenyl sulphonic acid groups (i.e., groups which contain at least one hydroxy-substituted phenyl ring and at least one sulphonic group) and naphthalene sulphonic acid groups and (c) 0 to 10% of the groups X are other aromatic groups.

    摘要翻译: 根据本发明,制造纸的方法包括形成纤维素悬浮液,向悬浮液中添加助留剂,将悬浮液排出筛网以形成片材,并干燥片材,并且在该过程中,我们向悬浮液中加入保留系统 包括聚环氧乙烷和更大量(干重)基本上由式-CH 2 -X-的重复单元组成的酚醛砜 - 甲醛树脂(PSR树脂),其中(a)10至100%的基团X为二(羟基苯基 )砜基团,(b)0至90%的基团X选自羟基苯基磺酸基团(即,含有至少一个羟基取代的苯基环和至少一个磺酸基团的基团)和萘磺酸基团, (c)0〜10%的基团X是其它芳族基团。

    Process for producing inorganic fiber-based prepreg sheet and process
for producing insulating laminate
    79.
    发明授权
    Process for producing inorganic fiber-based prepreg sheet and process for producing insulating laminate 失效
    无机纤维类预浸薄片的制造方法和绝缘层叠体的制造方法

    公开(公告)号:US5328566A

    公开(公告)日:1994-07-12

    申请号:US823985

    申请日:1992-01-22

    摘要: A process for producing an inorganic fiber-based prepreg sheet, which comprises preparing a slurry containing 35-80% by weight of a phenolic resin powder of 0.01-100 .mu.m in average particle diameter, 65-20% by weight of an inorganic fiber (the amounts are based on the total amount of the two) and a nonionic high-molecular fixing agent, making the slurry into a sheet in the same manner as in the paper making, and allowing the sheet to contain a silane coupling agent; and a process for producing an insulating laminate, which comprises laminating a prepreg sheet produced by the above process. According to the present invention, there can be produced an inorganic fiber-based prepreg sheet which has high insulating, which is superior in heat resistance, moisture resistance, dimensional stability in thickness direction and through hole ability and which gives rise to no whiting even when made into a laminate; and there can also be produced, from a laminate obtained by laminating the above inorganic fiber-based prepreg sheet, a laminate sheet for printed substrates of high-density wiring and mounting.

    摘要翻译: 一种无机纤维类预浸料片的制造方法,其特征在于,包括:制备含有35〜80重量%的平均粒径为0.01〜100μm的酚醛树脂粉末,65〜20重量%的无机纤维 (量基于两者的总量)和非离子高分子固定剂,以与制纸相同的方式将浆料制成片材,并使片材含有硅烷偶联剂; 以及制造绝缘层叠体的方法,其包括层压通过上述方法制备的预浸料片材。 根据本发明,可以制造具有高绝缘性的无机纤维类预浸料片,其耐热性,耐湿性,厚度方向尺寸稳定性和通孔能力优异,即使在 制成层压板; 并且也可以从通过层叠上述无机纤维类预浸薄片而获得的层叠体制造用于高密度布线和安装的印刷基板的层压片。