摘要:
A non-woven solidified by means of a melt binder is described, which is based on supporting aramid fibers and on binding fibers made of thermoplastic aramids whose melting point is below the melting or decomposition point of said supporting aramid fibers. In the non-woven, the binding fibers are virtually completely melted. The non-wovens are distinguished by high strength.
摘要:
A textile sheet-like structure containing a combination of an inorganic or polymeric organic reinforcing fiber of high tenacity and high modulus of elasticity and a matrix fiber made from a fully fusible aramid is described. The semi-finished product can be employed for the production of fiber-reinforced composite materials.
摘要:
Aromatic copolyamides, soluble in organic polyamide solvents, comprise at least 95 mol % of the recurrent structural units of the formulae ##STR1## and up to 5 mol % of structural units containing m-bonds. --Ar-- and --Ar'-- are here divalent, unsubstituted or substituted aromatic radicals, the valency bonds of which are in the para-position or in a comparable coaxial or parallel position, and --R and --R' are different from one another and are lower alkyl radicals or lower alkoxy radicals.
摘要翻译:可溶于有机聚酰胺溶剂的芳族共聚酰胺包含至少95mol%的式OCArCO A HNAr'NH B& C> D的复发结构单元和至多5mol%的含有m键的结构单元 。 -Ar-和-Ar'-在这里是二价,未取代或取代的芳族基团,其价键位于对位或相当的同轴或平行位置,并且-R和-R'彼此不同 并且是低级烷基或低级烷氧基。
摘要:
The invention provides a process for the continuous successive drawing and texturizing of undrawn multifilament polyester yarns according to the knit/deknit process, wherein undrawn filaments or yarns having a high preorientation corresponding to a yield stress of above 7.5 cN/tex are continuously drawn at room temperature and immediately thereafter subjected to a known knit/deknit texturizing.
摘要:
A process is provided for the manufacture of filament yarn having protruding filament ends on the basis of synthetic high polymers by melt spinning of the polymers through spinning nozzles, which comprises subjecting the multifilaments still hot after having left the spinning nozzle to a section cooling which causes determined sections of the single filaments to have a different molecular structure, and by subsequently drawing the filaments in a ratio which is greater than corresponding to those filament sections having a lower drawing ratio, and smaller than corresponding to those filament sections having a higher drawing ratio, thus causing the formation of determined breaks which supply the desired fiber ends.
摘要:
An aromatic copolyamide which is soluble in organic copolyamide solvents and contains recurring structural units of formulae I, II and III ##STR1## in which at least some of the radicals R.sup.1 are a group of formula --OC--R.sup.2 --CO--, in which R.sup.2 is a divalent aromatic radical having valence bonds in the para-position or in a comparable coaxial of parallel position to one another, and in which the remaining radicals are as defined.
摘要:
A process is provided for the manufacture of filament yarns having fine protruding filament ends, which comprises subjecting filament yarns, wherein at least part of the filaments consist of polymers the lateral bending resistance (Knickscheuerbestandigkeit) of which can be thermally influenced, to an intermittent sectional treatment, thus ensuring that determined sections of the filaments have a low lateral bending resistance, and by subsequently breaking these sections of low lateral bending resistance by transverse stress, which causes formation of the desired free filament ends.
摘要:
Aromatic copolyamides are described which are soluble in organic polyamide solvents and which essentially consist of the recurring structural units of the formulae Ia, Ib and Ic ##STR1## wherein R.sup.1 and R.sup.4 are divalent aromatic radicals, the valency bonds of which are in the para position or in a comparable coaxial or parallel position relative to one another, R.sup.2 is a radical of the formula III ##STR2## and R.sup.3 is a radical of the formula IV ##STR3## The mole fractions of the individual structural features in the copolyamides are fixed within selected limits. Fibers composed of the copolyamides claimed are distinguished by a high stretchability.
摘要翻译:描述了芳族共聚酰胺,其可溶于有机聚酰胺溶剂,并且其基本上由式Ia,Ib和Ic [OCR1CONHR2NH],(Ia)[OCR1CONHR3NH],(Ib)[OCR1CONHR3NH],(Ib)[OCR1CONHR4NH],(Ic)的重复结构单元组成 R 1和R 4是二价芳族基团,其价键位于相对于彼此的对位或相当的同轴或平行位置,R 2是式III的基团(III),并且R 3是基团 (IV)共聚酰胺中各个结构特征的摩尔分数固定在选定的范围内。 由所要求的共聚酰胺组成的纤维具有高的拉伸性。
摘要:
Aromatic copolyamides, preparation thereof and structures formed therefromThere are described aromatic copolyamides which are soluble in organic solvents for polyamides and which comprise at least 95 mol % of recurring structural units of formulae ##STR1## and up to 5 mol % of meta-bonded structural units E and/or F derived from aromatic dicarboxylic acids (E') and/or from aromatic diamines (F'), the sum total of the mole fractions of structural units A+E and the sum total of the mole fractions of structural units B+C+D+F being essentially of equal magnitude.The copolyamides of the present invention can be processed into fibers having high strengths and high breaking extensions.
摘要翻译:芳族共聚酰胺,其制备方法和由其形成的结构描述了可溶于聚酰胺的有机溶剂中的芳香族共聚酰胺,其包含至少95mol%的式OC a CO A NHAr'NH B的重复结构单元 和至多5摩尔%的由芳族二羧酸(E')和/或芳族二胺(F')衍生的间接键合结构单元E和/或F,结构单元A + E的摩尔分数的总和 并且结构单元B + C + D + F的摩尔分数的总和基本上等于大小。 本发明的共聚酰胺可以加工成具有高强度和高断裂延伸性的纤维。
摘要:
Aromatic copolyamides, soluble in organic polyamide solvents, comprise at least 95 mol % of the recurrent structural units of the formulae ##STR1## and up to 5 mol % of structural units containing m-bonds. Here --Ar--is a divalent, unsubstituted or substituted aromatic radical, the valency bonds of which are in the para-position or in a comparable coaxial or parallel position, and --R--and --R' are different from one another and are lower alkyl radicals or lower alkoxy radicals.
摘要翻译:可溶于有机聚酰胺溶剂的芳香族共聚酰胺包含至少95mol%的式OCArCO A B图像的复发结构单元和至多5mol%含有m键的结构单元 。 这里-Ar-是二价,未取代或取代的芳族基团,其价键位于对位或可比较的同轴或平行位置,并且-R - 和-R'彼此不同并且较低 烷基或低级烷氧基。