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    • 2. 发明授权
    • Shaped silion carbide-eased ceramic article
    • 形状的碳化硅硬化陶瓷制品
    • US5091271A
    • 1992-02-25
    • US420560
    • 1989-10-12
    • Toru SawakiAkio NakaishiKeizo ShimadaTakashi Watanabe
    • Toru SawakiAkio NakaishiKeizo ShimadaTakashi Watanabe
    • C04B35/571C04B35/622
    • C04B35/62227C04B35/571Y10S428/902Y10T428/2918
    • A shaped silicon carbide-based ceramic article having an improved mechanical strength is produced at a high efficiency by a process comprising the step of: forming an organic silicone polymer, for example, polycarbosilastyrene copolymer, into a predetermined shape, for example, a filament or film; doping the shaped polymer with a doping material consisting of at least one type of halogen, for example, bromine or iodine, in an amount of 0.01% to 150% based on the weight of the shaped polymer, to render the shaped polymer infusible; and pyrolyzing the infusible shaped polymer into a shaped SiC-based ceramic article at a temperature of 800.degree. C. to 1400.degree. C. in an inert gas atmosphere, optionally the halogen-doped shaped polymer being treated with a basic material, for example, ammonia, before the pyrolyzing step, to make the filament uniformly infusible.
    • 通过包括以下步骤的方法以高效率生产具有改善的机械强度的成形碳化硅基陶瓷制品:将有机硅氧烷聚合物,例如聚碳硅烷基苯乙烯共聚物形成预定形状,例如长丝或 电影; 使用由至少一种类型的卤素(例如溴或碘)组成的掺杂材料,以成形聚合物的重量计为0.01%至150%的量掺杂成型聚合物,以使成形聚合物不熔化; 并在惰性气体气氛中,在800℃至1400℃的温度下将可熔成形聚合物热解成成型的SiC基陶瓷制品,任选地,用碱性材料处理的掺杂卤素的聚合物,例如, 氨,在热解步骤之前,使细丝均匀地不熔融。
    • 3. 发明授权
    • Wholly aromatic halogenated polyamide fiber and film
    • 全芳香卤化聚酰胺纤维和薄膜
    • US4507467A
    • 1985-03-26
    • US527377
    • 1983-08-29
    • Keizo ShimadaHideharu SasakiHiroshi MeraToru SawakiAkihiro Aoki
    • Keizo ShimadaHideharu SasakiHiroshi MeraToru SawakiAkihiro Aoki
    • C08G69/00C08G69/32C08J5/18D01F6/80
    • C08J5/18C08G69/32D01F6/805C08J2377/10
    • High modulus shaped articles such as fibers and films, composed of a wholly aromatic copolyamide, are provided. The wholly aromatic copolyamide is comprised of recurring units of the formulae:--NH--AR.sub.1 --NH--CO--Ar.sub.2 --CO-- (A)and--NH--Ar.sub.3 --CO-- (B)wherein Ar.sub.1, Ar.sub.2 and Ar.sub.3 independently stand for divalent groups selected from ##STR1## in which X's independently stand for a group selected from halogeno, alkyl, aralkyl, aromatic, alkoxy, acetyl and cyano, n is 1 to 3 and Y is selected from ##STR2## in which R' stands for an 1-5C alkyl group, and the copolymerization ratio expressed by the molar ratio of the total of Ar.sub.1, Ar.sub.2 and Ar.sub.3 fails within the square hatched region in a triangular coordinate of FIG. 1, and said copolyamide has an intrinsic viscosity of at least 1.5. The shaped articles are prepared by a process wherein a solution comprised of the above-defined wholly aromatic copolyamide, a halide of a metal of Group I or II of the Periodic Table and an amide type organic solvent is subjected to wet or dry shaping; and then, the shaped article is stretched at a stretch ratio of at least 1.5 at an elevated temperature.
    • 提供了由全芳族共聚酰胺组成的高模量成形制品如纤维和薄膜。 全芳香族共聚酰胺由下式的重复单元组成:-NH-AR1-NH-CO-Ar2-CO-(A)和-NH-Ar3-CO-(B)其中Ar1,Ar2和Ar3独立地表示二价 选自(a)(b)(c),其中X独立代表选自卤代,烷基,芳烷基,芳族,烷氧基,乙酰基和氰基的基团,n为 1〜3,Y选自其中R'表示1-5C烷基的“IMAGE”,由Ar1,Ar2和Ar3的总量的摩尔比表示的共聚比在a 图3的三角坐标。 1,所述共聚酰胺的特性粘度至少为1.5。 成型制品通过以下方法制备,其中将由上述定义的全芳族共聚酰胺,元素周期表第I族或第II族金属的卤化物和酰胺型有机溶剂组成的溶液进行湿法或干法成型; 然后,成形制品在升高的温度下以至少1.5的拉伸比拉伸。
    • 8. 发明授权
    • Aromatic polyamide composition and processes for preparing film and
fiber therefrom
    • 芳族聚酰胺组合物及其制备薄膜和纤维的方法
    • US4529763A
    • 1985-07-16
    • US482817
    • 1983-04-07
    • Yorikazu TamuraAkihiro AokiKeizo Shimada
    • Yorikazu TamuraAkihiro AokiKeizo Shimada
    • C08L77/00C08K3/16C08L77/10C08K5/20
    • C08K3/16C08K3/24C08K5/20
    • There is provided an aromatic polyamide composition, which comprises (a) a polyamide, the recurring structural units of which are substantially totally aromatic, (b) an organic amide solvent, and (c) one or more salts selected from chlorides and bromides of an alkali metal, an alkaline earth metal or ammonium. The amounts of the polyamide and the organic amide solvent are in the ranges of 30 to 50% and 70 to 50% by weight, respectively, based on the total weight of the polyamide and the organic amide solvent. The amount of the salt is defined by the formulae:in the case where 30.ltoreq.x.ltoreq.33.6, y.gtoreq.10, andin the case where 33.6 2.8x-84wherein "x" is the amount in % by weight of the polyamide based on the total weight of the polyamide and the organic amide solvent, and "y" is the amount in % by mole of the salt based on the polyamide. The polyamide composition is useful for melt-shaping films, fibers and other shaped articles.
    • 提供了一种芳族聚酰胺组合物,其包含(a)聚酰胺,其重复结构单元基本上是全芳族的,(b)有机酰胺溶剂,和(c)一种或多种选自氯化物和溴化物的盐 碱金属,碱土金属或铵。 基于聚酰胺和有机酰胺溶剂的总重量,聚酰胺和有机酰胺溶剂的量分别为30-50%和70-50wt%。 盐的量由下式定义:在30 / = 10的情况下,在33.6 2.8×-84 其中“x”是聚酰胺的重量百分比(以聚酰胺和有机酰胺溶剂的总重量计),“y”是以聚酰胺为基准的盐的摩尔%。 聚酰胺组合物可用于熔融成型薄膜,纤维和其它成型制品。