发明名称 Faeden und Folien bildendes Polymergemisch
摘要 1,220,544. Polymeric filaments. ALLIED CHEMICAL CORP. 17 June, 1969 [10 Sept., 1968], No. 30712/69. Heading B5B. [Also in Division C3] A fibre is made by extruding a molten polymer blend at 243-280‹ C. through a die at 252- 290‹ C., quenching, drawing to 3-4 times original length, e.g. by passing round a draw pin at 85‹ C. and over heating plate at 150-160‹ C. The stretched mono-filament is then crushed between rollers and vibrated by passing through a high velocity jet stream of air, which may or may not split it into fibrils depending on the composition and temperature involved. The blend comprises at least two of: (i) a polyamide, (ii) a polyester, and (iii) a polyolefin; and also (iv) a synthetic elastomer. 80 wt. per cent of any of (i), (ii), or (iii) are present. 0À5-15 wt. per cent (iv) is present. (iv) has (a) glass transition temperature-100‹ to 0‹ C., and (b) secant modulus at 300% extension of 100-3000 p.s.i. at 20‹ C. At extrusion temp., (iv) is sufficiently stable to withstand drawing, and has viscosity 10<SP>2</SP>-10<SP>4</SP> poise at shear-rate 150 see.<SP>-1</SP>, and low enough to allow (iv) to be dispersed in the extrudate as particles of diameter # 5Ám., and sufficiently low viscosity at drawing temp. to form an elongated elastomer phase in the drawn phase, and adheres more strongly to each of the polymers than the polymers do to each other. Polyamide (i) may be, e.g. a polylactam, polycaproamide, or polyhexamethylene adipamide or sebacamide; exemplified is polycaprolactam with number av. M.W. 22,000-27,000; melt index is preferably 10- 70 g./10 min./260‹ C./2160g. Reduced viscosity is 0À4-4À0 dl./g. in meta-cresol at 25‹ C. Polyester (ii) is preferably polyethylene terephthalate which may have reduced viscosity in dl./g. at 25‹ C. of 0À24-0À5 in o-chlorophenol or 0À65 in m-cresol; many other polyesters are referred to. Polyolefin (iii) may be a polymer or copolymer of ethylene, propylene, or 4-&alpha;-methylpentene; exemplified is polypropylene with viscosity av. M.W.Mv. of 300,000 or melt-index 7À5 g./10 min. Elastomer (iv) may be: a block butadiene/ styrene copolymer; or a random and/or block ethylene/propylene or butadiene/acrylonitrile copolymer. (iv) should exhibit no or very little crystallinity after processing. It should form a distinct phase in the blend at all times. The blends may be prepared by mixing at up to 350‹ C. (i), (ii), and/or (iii) may be dry-blended before melting, or the entire mixing can be performed in the melt. Or the polymers may be dissolved in a common solvent and precipitated by evaporation of the solvent or addition of a non-solvent. 1-60% other polymers may be added to the blend.
申请公布号 DE1932775(A1) 申请公布日期 1970.03.19
申请号 DE19691932775 申请日期 1969.06.27
申请人 ALLIED CHEMICAL CORP. 发明人 CIRIL PREVORSEK,DUSAN;ROBERT LAMB,GEORG EDWIN
分类号 C08L23/02;C08L67/02;C08L77/00 主分类号 C08L23/02
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