Base webs for printed circuit board production using the foam process and acrylic fibers
    103.
    发明授权
    Base webs for printed circuit board production using the foam process and acrylic fibers 失效
    用于使用泡沫工艺和丙烯酸纤维的印刷电路板生产的底座

    公开(公告)号:US06368698B1

    公开(公告)日:2002-04-09

    申请号:US09573977

    申请日:2000-05-19

    Abstract: A printed circuit board is made from at least one non-woven sheet or web layer comprising at least 50% by weight acrylic fibers, with any balance substantially electrically non-conductive fibers, filler, and binder. The sheet or web is preferably made by the foam process, and may contain 60-80% straight polyacrylonitrile fibers and 40-20% fibrillated (pulp) ones. The web or sheet is preferably compressed by thermal calendering so that it has a density of about 0.1-1 grams per cubic centimeter; and the web or sheet may have a basis weight of between about 20-120 grams per square meter. The web or sheet may also have a 1-40% of substantially electrically non-conductive organic or inorganic binder, or may be substantially binder free. A printed circuit board made using the layers of these non-woven webs or sheets is otherwise conventional, including a pre-preg material, electrically conductive circuit elements, and electronics, and has improved properties compared to woven glass and non-woven aramid products, including improved fiber consolidation, easy board construction, and improved MD/CD ratio and stability.

    Abstract translation: 印刷电路板由至少一种包含至少50重量%的丙烯酸纤维的无纺布片材或纤维网层制成,任何平衡物基本上不导电的纤维,填料和粘合剂。 片材或纤维网优选通过泡沫方法制成,并且可以含有60-80%的直链聚丙烯腈纤维和40-20%的原纤化(纸浆)纤维。 纤维网或片材优选通过热压延来压缩,使其具有约0.1-1克/立方厘米的密度; 并且网或片可以具有介于约20-120克/平方米之间的基重。 幅材或片材还可以具有1-40%的基本上不导电的有机或无机粘合剂,或者可以是基本上不含粘合剂的。 使用这些非织造网或片的层制成的印刷电路板是常规的,包括预浸材料,导电电路元件和电子元件,并且与机织玻璃和非织造芳族聚酰胺产品相比具有改进的性能, 包括改进的纤维固结,易于板的构建,以及改善的MD / CD比和稳定性。

    Methods of fabricating cross-linked biobased materials and structures fabricated therewith
    104.
    发明授权
    Methods of fabricating cross-linked biobased materials and structures fabricated therewith 失效
    制造交联的生物基材料和用其制造的结构的方法

    公开(公告)号:US06339116B1

    公开(公告)日:2002-01-15

    申请号:US08770212

    申请日:1996-12-19

    Abstract: Biobased cross-linked compositions, methods of fabrication and structures, in particular biobased printed wiring boards using the compositions and methods of making the structures are described. Biobased materials such as lignin, crop oils, wood resins, tannins, and polysaccharides and combinations thereof are cross-linked, preferably using heat, a cross-linking agent, and an initiator. The materials fabricated have suitable properties for printed wiring boards which are made by impregnating a fiberglass or biobased cloth with an admixture of the biobased material, cross-linking agent and initiator which is processed by conventional methods to produce a printed wiring board.

    Abstract translation: 描述了生物基交联组合物,制造方法和结构,特别是使用组合物的生物基印刷线路板和制造结构的方法。 生物基材料如木质素,作物油,木材树脂,单宁和多糖及其组合是优选使用热交联剂和引发剂交联的。 制造的材料具有适用于印刷线路板的性能,其通过用生物基材料,交联剂和引发剂的混合物浸渍玻璃纤维或生物基布而制成,其通过常规方法加工以生产印刷线路板。

    Heat-resistant fiber paper
    105.
    发明授权
    Heat-resistant fiber paper 失效
    耐热纤维纸

    公开(公告)号:US06319605B1

    公开(公告)日:2001-11-20

    申请号:US09147630

    申请日:1999-02-04

    Abstract: A heat resistant fiber sheet composed of staple fibers consisting of a heat resistant organic high molecular polymer and fibrids consisting of a heat resistant organic high molecular polymer as main components, having excellent heat resistance, dimensional stability to heat, interlaminar peeling strength, electric insulation resistance under a high humidity, etc., and also good resin impregnating property in spite of having a high bulk density, and especially suitable for a base substrates for an electric insulating material and a laminate for an electric circuit, is obtained by setting the amount of the staple fibers occupying in the total amount of the sheet as 40 to 97% by weight and the amount of the fibrids as 3 to 60% by weight and partially softening and/or melting the fibrids so as to act as a binder.

    Abstract translation: 由耐热有机高分子聚合物和由耐热有机高分子聚合物组成的纤维状物作为主要成分的短纤维组成的耐热纤维片材,耐热性,热稳定性,层间剥离强度,电绝缘电阻 在高湿度等下,并且尽管具有高的堆积密度,并且特别适合于用于电绝缘材料的基底和用于电路的层压板的树脂浸渍性能通过设定量 占片材总量的短纤维为40〜97重量%,纤条体的量为3〜60重量%,部分软化和/或熔融纤条体,以起粘合剂的作用。

    Method for drilling circuit boards
    107.
    发明授权
    Method for drilling circuit boards 有权
    电路板钻孔方法

    公开(公告)号:US06200074B1

    公开(公告)日:2001-03-13

    申请号:US09287811

    申请日:1999-04-07

    Abstract: A method and materials for drilling through-holes in printed circuit boards with a drilling tool is disclosed. The method involves the use of a lubricating entry material placed on the top surface of a stack of printed circuit boards and a lubricating backup board placed beneath the bottom surface of the stack of printed circuit boards. The lubricating entry material has a core with skins attached on both sides by a lubricant/adhesive. Similarly, the backup board has a core with skins attached on both sides by a lubricant/adhesive. The skins are hard enough to support the top and bottom surfaces of the printed circuit boards and thereby reduce burring at the entry point and exit point of the through-hole. The lubricant/adhesive coats the drilling tool during the drilling operation to reduce friction and thereby reduce the temperature of the drilling tool.

    Abstract translation: 公开了一种用于在具有钻孔工具的印刷电路板中钻通孔的方法和材料。 该方法包括使用放置在印刷电路板堆叠的顶表面上的润滑入口材料和布置在印刷电路板堆叠的底表面下方的润滑支撑板。 润滑进入材料具有芯,其两侧通过润滑剂/粘合剂附着表皮。 类似地,备用板具有通过润滑剂/粘合剂在两侧附着表皮的芯。 表皮很难承受印刷电路板的顶表面和底表面,从而减少通孔入口点和出口处的毛刺。 润滑剂/粘合剂在钻孔操作期间涂覆钻孔工具以减少摩擦,从而降低钻具的温度。

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