Heat- and chemical-resistant acrylic short fibers without spinning
    1.
    发明授权
    Heat- and chemical-resistant acrylic short fibers without spinning 失效
    耐热耐化学品丙烯酸短纤维,不纺纱

    公开(公告)号:US5401576A

    公开(公告)日:1995-03-28

    申请号:US64345

    申请日:1993-05-20

    摘要: A new, pulp-like, acrylic short fiber having excellent heat- and chemical-resistance is provided. The fiber has a thickness distribution of 0.1 .mu.m to 50 .mu.m, a length distribution of 1 mm to 20 mm, and a thermal transition temperature (Tg) of above 200.degree. C. The fiber is produced by heating a mixture of polyacrylonitrile and water of about 5% to 100% by weight to temperatures above hydration-melting temperature under seal to an amorphous melt; cooling the resulting amorphous melt to temperatures between the melting and the solidifying temperatures of the melt to form a supercooled melt; extruding the resulting supercooled melt to give extrudates; heat-stabilizing the resulting extrudates at temperatures between 180.degree. C. and 300.degree. C. for 1 minute to 4 hours after drying and drawing; and cutting and beating the resulting heat-stabilized extrudates into an appropriate size.

    摘要翻译: 提供了具有优异的耐热和耐化学性的新的纸浆状丙烯酸类短纤维。 纤维的厚度分布为0.1μm〜50μm,长度分布为1mm〜20mm,热转变温度(Tg)为200℃以上。纤维通过加热聚丙烯腈和 约5%至100%重量的水至密封下的水合熔融温度至无定形熔体的温度; 将所得到的无定形熔体冷却至熔体的熔融温度和固化温度之间以形成过冷熔体; 挤出所得过冷熔体以得到挤出物; 在180℃至300℃的温度下,将所得挤出物在干燥和拉伸后热稳定1分钟至4小时; 并将所得热稳定的挤出物切割并打浆成适当的尺寸。

    Unspun acrylic staple fibers
    2.
    发明授权
    Unspun acrylic staple fibers 失效
    松散丙烯酸短纤维

    公开(公告)号:US5589264A

    公开(公告)日:1996-12-31

    申请号:US446287

    申请日:1995-05-22

    摘要: A highly-oriented acrylic staple fiber prepared by simple extrusion of a PAN/H.sub.2 O melt in a gel crystalline state without spinning is provided. The acrylic fibers according to the present invention are characterized by the following properties: a degree of orientation between 80 and 97% observed by an X-ray diffraction; a length distribution ranging from 5 to 500 mm and a thickness distribution ranging from 5 to 500 .mu.m, a length to thickness ratio ranging from 100 to 100,000 determined by a scanning electromicroscope; a tensile strength of 10 to 70 kg/mm.sup.2 ; an initial tensile modulus of 300 to 1,500 kg/mm.sup.2 ; an elongation of 5 to 20%; and a specific surface area of 1 to 50 m.sup.2 /g.

    摘要翻译: 提供了一种通过简单地挤出PAN / H 2 O熔体在凝胶状态而不纺丝而制备的高度取向的丙烯酸短纤维。 根据本发明的丙烯酸纤维的特征在于以下性质:通过X射线衍射观察到的取向度在80和97%之间; 长度分布范围为5〜500mm,厚度分布范围为5〜500μm,通过扫描型电子显微镜测定的厚度比范围为100〜100,000; 拉伸强度为10〜70kg / mm2; 初始拉伸模量为300〜1500kg / mm2; 伸长5〜20%; 比表面积为1〜50m2 / g。

    Process for the production of acrylic short fibers without spinning
    3.
    发明授权
    Process for the production of acrylic short fibers without spinning 失效
    不纺纱的丙烯酸短纤维生产工艺

    公开(公告)号:US5219501A

    公开(公告)日:1993-06-15

    申请号:US723187

    申请日:1991-06-28

    IPC分类号: D01D5/26 D01F6/18

    CPC分类号: D01F6/18 D01D5/26

    摘要: A process for the production of pulp-like short fibers having a highly-oriented fibril structure without spinning is provided. This process comprises heating a mixture of water and an acrylonitrile homopolymer or copolymer to a temperature above the melting temperature of the mixture under enclosed conditions to form an amorphous melt; cooling the resulting amorphous melt to a temperature below the melting temperature to obtain a supercooled melt phase; extruding the resulting supercooled melt phase through a slit die at a temperature between the melting and the solidifying temperatures of the melt phase into an external atmosphere to give extrudates; and subjecting the resulting extrudates to drawing and heat treatment followed by beating mechanically.

    摘要翻译: 提供了一种用于生产具有高度取向的原纤维结构而不纺丝的纸浆状短纤维的方法。 该方法包括在封闭条件下将水和丙烯腈均聚物或共聚物的混合物加热到高于混合物的熔融温度的温度以形成无定形熔体; 将所得无定形熔体冷却至低于熔融温度的温度,以获得过冷熔融相; 将所得过冷熔融相通过狭缝模头在熔融相的熔融温度和固化温度之间的温度下挤出到外部气氛中,得到挤出物; 并对所得的挤出物进行拉伸和热处理,然后机械地进行打浆。

    Non-spun, short, acrylic polymer, fibers
    4.
    发明授权
    Non-spun, short, acrylic polymer, fibers 失效
    非纺,短,丙烯酸聚合物,纤维

    公开(公告)号:US5434002A

    公开(公告)日:1995-07-18

    申请号:US148629

    申请日:1993-11-08

    摘要: A non-spun fiber of acrylic polymers, characterized by a pulp-like short fiber form of a thickness distribution of 0.1 to 100 .mu.m and a length distribution of 0.1 to 100 mm, and by irregular cross-sections in a plane taken perpendicular to the fiber axis and needle point-like ends similar to those of natural wood pulp fibers. The acrylic fiber of the present invention is made of an acrylonitrile homopolymer or copolymer consisting of a least 70% acrylonitrile (by weight) and at most 30% copolymerizable monomers (by weight) and having a viscosity average molecular weight between 10,000 to 600,000. The acrylic fiber according to the invention is further featured by the following physical properties: a degree of orientation of more than 80% based on X-ray diffraction pattern data, a tensile strength of 3 to 10 g/denier and an initial modulus of 30 to 100 g/denier, and absolutely no cylindrically-shaped filament trunks.

    摘要翻译: 丙烯酸类聚合物的非纺丝纤维,其特征在于厚度分布为0.1〜100μm,长度分布为0.1〜100mm的纸浆状短纤维形状,以及垂直于 纤维轴和针尖端类似于天然木浆纤维。 本发明的丙烯酸系纤维由丙烯腈均聚物或共聚物构成,丙烯腈均聚物或共聚物由至少70%的丙烯腈(重量)和最多30%的可共聚单体(重量比)组成,粘均分子量为10,000〜600,000。 根据本发明的丙烯酸纤维还具有以下物理性质:基于X射线衍射图数据,取向度大于80%,拉伸强度为3至10g /旦,初始模量为30 到100克/旦,绝对没有圆柱形的长丝。

    Pulp-like short fibers from liquid crystal polyesters
    5.
    发明授权
    Pulp-like short fibers from liquid crystal polyesters 失效
    来自液晶聚酯的纸浆短纤维

    公开(公告)号:US5454910A

    公开(公告)日:1995-10-03

    申请号:US303878

    申请日:1994-09-09

    摘要: Pulp-like short fibers prepared from liquid crystal polyesters capable of forming an anisotropic melt phase at a temperature of 200.degree. C. to 400.degree. C. and having a molecular weight of 2,000 to 100,000 are provided. These fibers consist of microfibrils and have the following highly-oriented fiber characteristics and properties:(a) Tensile strength: 5-30 g/den.;(b) Modulus of elasticity: 200-1,500 g/den.;(c) Orientation angle as determined by an X-ray diffraction: below 20.degree.;(d) Thickness distribution: 0.1-50 .mu.m;(e) Length distribution: 0.1-50 mm; and(f) Specific surface area as determined by a nitrogen adsorption method: 3-30 m.sup.2 /g.

    摘要翻译: 提供由能够在200℃至400℃的温度下形成各向异性熔融相的分子量为2,000至100,000的液晶聚酯制备的纸浆状短纤维。 这些纤维由微原纤维组成,具有以下高取向纤维特性和性能:(a)抗拉强度:5-30g / (b)弹性模量:200-1,500克/旦; (c)通过X射线衍射测定的取向角:低于20°; (d)厚度分布:0.1-50μm; (e)长度分布:0.1-50mm; 和(f)通过氮吸附法测定的比表面积:3-30m 2 / g。

    Wholly aromatic polyamides and copolyamides, and process therefor
    6.
    发明授权
    Wholly aromatic polyamides and copolyamides, and process therefor 失效
    全芳族聚酰胺和共聚酰胺,及其加工方法

    公开(公告)号:US5132393A

    公开(公告)日:1992-07-21

    申请号:US708167

    申请日:1991-05-31

    CPC分类号: C08G69/265 C08G69/32

    摘要: Novel wholly aromatic polyamides and copolyamides of the formula: ##STR1## are provided. The aromatic polyamides and copolyamides are prepared by condensation polymerizing an aromatic diamine selected from 3,5-diaminobenzophenone and a mixture of 3,5-diaminobenzophenone and m-phenylenediamine with an aromatic dibasic acid chloride in a chemical equivalent amount. The polymers of the invention can be easily dissolved in an organic solvent to give a molding solution suitable for use in the film casting. The film resulted from the polyamides of the invention has excellent physiochemical properties such as durability, chemical resistance, flexibility, compactness, tenacity, transparency and electric insulation.

    摘要翻译: 提供了新的全芳族聚酰胺和下式的共聚酰胺:(VI)。 通过将选自3,5-二氨基二苯甲酮和3,5-二氨基二苯甲酮和间苯二胺的混合物的芳族二胺与化学当量的芳族二元酰氯缩聚而制备芳族聚酰胺和共聚酰胺。 本发明的聚合物可以容易地溶解在有机溶剂中,得到适合用于膜铸造的成型溶液。 由本发明的聚酰胺产生的膜具有优异的物理化学性质,例如耐久性,耐化学性,柔韧性,致密性,韧性,透明性和电绝缘性。

    Wholly aromatic polyamide from N,N'-bis (4-amino phenyl)-isophthalamide
    7.
    发明授权
    Wholly aromatic polyamide from N,N'-bis (4-amino phenyl)-isophthalamide 失效
    来自N,N'-双(4-氨基苯基) - 间苯二酰胺的全芳族聚酰胺

    公开(公告)号:US5093464A

    公开(公告)日:1992-03-03

    申请号:US441465

    申请日:1989-11-27

    IPC分类号: C08G69/32 D01F6/80

    CPC分类号: C08G69/32 D01F6/805

    摘要: New wholly aromatic polyamides are provided. This polymers are prepared by a mixture of N,N'-bis(4-aminophenyl)-isophthalamide and p-phenylenediamine in a tertiary amide solvent containing an alkali metal salt such as LiCl and a tertiary amine as an acid acceptor. The polymers are easily dry-jet spun to form a fiber and cast to form a film. The fiber and film so obtained have ultrahigh tenacity, elasticity and elongation.

    摘要翻译: 提供新的全芳族聚酰胺。 该聚合物通过N,N'-双(4-氨基苯基) - 间苯二胺和对苯二胺的混合物在含有碱金属盐如LiCl和叔胺作为酸受体的叔胺溶剂中制备。 聚合物容易地被干喷射纺丝以形成纤维并且浇铸以形成膜。 所得到的纤维和薄膜具有超强度,弹性和伸长率。

    Reducing scattering center data using multi-volume aggregation
    8.
    发明授权
    Reducing scattering center data using multi-volume aggregation 有权
    使用多体积聚集减少散射中心数据

    公开(公告)号:US07602332B1

    公开(公告)日:2009-10-13

    申请号:US12138814

    申请日:2008-06-13

    摘要: In one example, a method to reduce scattering centers (SC) includes receiving a set of SC data points associated with an object in three-dimensional space, partitioning the SC data points into a plurality of volumes, aggregating the SC data points within each volume based on an aggregate threshold and combining the aggregated SC data points associated with each volume to form a reduced set of SC data points. The method also includes comparing the reduced set of SC data points with the received set of SC data points to determine if the reduced set of SC data points meets a set of comparison metrics and if the reduced set of SC data points meets the set of comparison metrics, increasing the size of the volumes and performing another iteration of reducing the SC data points by volume.

    摘要翻译: 在一个示例中,减少散射中心(SC)的方法包括:接收与三维空间中的对象相关联的一组SC数据点,将SC数据点分割成多个卷,聚集每个卷内的SC数据点 基于聚合阈值并组合与每个卷相关联的聚合SC数据点以形成一组缩减的SC数据点。 该方法还包括将缩小的SC数据点集合与所接收的SC数据集合进行比较,以确定缩减的SC数据集合是否满足一组比较度量,以及如果缩减的SC数据集合满足该比较集合 度量,增加卷的大小,并执行按体积减少SC数据点的另一次迭代。

    Generating radar cross-section signatures
    9.
    发明授权
    Generating radar cross-section signatures 有权
    生成雷达横截面签名

    公开(公告)号:US08390508B1

    公开(公告)日:2013-03-05

    申请号:US12753982

    申请日:2010-04-05

    IPC分类号: G01S13/00

    CPC分类号: G01S7/412

    摘要: In one aspect, a method to generate radar cross section (RCS) signatures, includes determining a spectrum of an object and using the spectrum of the object to generate RCS signatures of a plurality of objects. In another aspect, an apparatus to generate radar cross section (RCS) signatures includes circuitry to determine a spectrum of an object; and use the spectrum of the object to generate RCS signatures of a plurality of objects. In a further aspect, an article includes a machine-readable medium that stores executable instructions to generate radar cross section signatures (RCS). The executable instructions cause a machine to determine a spectrum of an object and use the spectrum of the object to generate RCS signatures of a plurality of objects.

    摘要翻译: 一方面,一种生成雷达横截面(RCS)签名的方法包括:确定对象的频谱,并使用对象的频谱来生成多个对象的RCS签名。 在另一方面,一种产生雷达截面(RCS)签名的装置包括确定对象的频谱的电路; 并使用对象的频谱来生成多个对象的RCS签名。 在另一方面,物品包括存储可执行指令以产生雷达截面签名(RCS)的机器可读介质。 可执行指令使机器确定对象的频谱,并使用对象的频谱来生成多个对象的RCS签名。

    ELECTROMAGNETIC (EM) SOLVER USING A SHOOTING BOUNCING RAY (SBR) TECHNIQUE
    10.
    发明申请
    ELECTROMAGNETIC (EM) SOLVER USING A SHOOTING BOUNCING RAY (SBR) TECHNIQUE 有权
    电磁(EM)解决方案使用拍摄曝光(SBR)技术

    公开(公告)号:US20100066595A1

    公开(公告)日:2010-03-18

    申请号:US12212783

    申请日:2008-09-18

    IPC分类号: G01S7/04

    CPC分类号: G01S7/412

    摘要: In one aspect, a system to generate radar signatures for multiple objects in real-time includes a first module including at least one processor to perform a shooting and bouncing (SBR) technique to solve for physical optics and multi-bounce characteristics of the objects. The at least one processor includes a central processing unit to perform dynamic ray tracing and a graphics processing unit (GPU) to perform far field calculations. The GPU includes a hit point database to store entries associated with rays that intersect an object.

    摘要翻译: 一方面,实时地为多个物体生成雷达签名的系统包括包括至少一个处理器的第一模块,以执行拍摄和反弹(SBR)技术来解决物体的物理光学和多反弹特性。 所述至少一个处理器包括执行动态光线跟踪的中央处理单元和执行远场计算的图形处理单元(GPU)。 GPU包括一个命中点数据库来存储与对象相交的光线相关联的条目。