Abstract: A process and apparatus are provided for the production of a non-woven fabric by melt-blowing wherein one or more yarns, e.g. monofilaments, are added or charged into the fabric stream between the extruder and collector by means of a supporting and drawing pressure gas stream. In one embodiment means are provided to regulate flow of the gas stream. In another embodiment means are provided to reciprocate or to rotate through a small arc the one or more charging means.

Abstract: An artificial leather is made by impregnating a special nonwoven web substrate with an elastic polymer material. In another embodiment the substrate comprises a nonwoven fabric laminated to a woven or nonwoven fabric.

Abstract: A process for producing a thermoplastic nonwoven fabric having a uniform thickness and optionally napped fibers according to a melt blowing method, which comprises blowing a fiber stream consisting of melt blown fibers and a gas at a high speed onto a plate within a valley-like fiber-collecting zone formed by two plates having a large number of pores, to form a uniform nonwoven fabric without scattering fibers.

Abstract: In an improved die-nose assembly for a melt-blowing process wherein molten resin is extruded from a series of die-holes while heated gas is blown out through slots on either side of the die nose associated therewith, spacers which are movable widthwise of the die assembly are provided in the gas slots to provide effective uniformity in the gas streams across the width of the die.

Abstract: An improved coat hanger die is provided wherein the manifold is curved and wherein the manifold radius, coat hanger slit part thickness and the form of the coat hanger die are determined by a formula which is disclosed all in relation to the radius of the manifold at its inlet. The radius of the manifold at its inlet is selected in consideration of the flow characteristics of the resin melt to provide a low melt velocity at the inlet.

Abstract: A process and apparatus are provided for the production of a non-woven fabric by melt-blowing wherein one or more yarns, e.g. monofilaments, are added or charged into the fabric stream between the extruder and collector by means of a supporting and drawing pressure gas stream. In one embodiment means are provided to regulate flow of the gas stream in another embodiment means are provided to reciprocate or to rotate through a small arc the one or more charging means.

Abstract: A process for the production of modified polyolefins by combining a polyolefin with one or more carboxylic acids or their anhydrides in the presence of a radical producing agent in an extruder and in the presence of an organosilane. If desired glass fibers can also be incorporated at the same time.

Abstract: Modified polyolefin having high adhesion strength and less irritating odor during processing is obtained by reacting unsaturated carboxylic acid or its anhydride grafted polyolefin with a bifunctional compound having alcohol groups or amine groups. Preferable unsaturated carboxylic acids are maleic acid, and endobicyclo-[2,2,1]-5-heptene-2,3-dicarboxylic acid. Preferable bifunctional compounds are ethylene glycol, 1,4-butanediol, 1,6-hexanediol, glycerine, ethylene diamine, 1,3-diaminopropane m-phenylene diamine, etc.

Abstract: Polyurethane paint is applied with good adhesion to a vulcanized rubber surface composed of halogenated butyl rubber or blends thereof with natural rubber, SBR rubber, EPDM rubber, polybutadiene rubber, acrylonitrile butadiene rubber, polychlorophrene rubber, synthetic polyisoprene rubber, or chloro sulfonated polyethylene rubber, the blends containing at least 30 phr halogenated butyl rubber, the rubber having been cured using a metal oxide or halide and an alkyl phenol polysulfide accelerator.

Abstract: A process for the production of a catalyst component for use in the polymerization of .alpha.-olefins, which comprises reducing titanium tetrachloride with an organo aluminum compound having the general formula Al Rn X.sub.3-n wherein R represents a hydrocarbon group having 1 to 18 carbon atoms, x represents a halogen atom and n represents a suitable numeral between o<n.ltoreq.3, to thus obtain a reduced solid, then removing aluminum compounds contained in said reduced solid and activating with a mixture or a complex of titanium tetrachloride and a dialkyl ether of the general formula R'OR" wherein R' and R" are (a) alkyl groups having 1-4 carbon atoms, (b) normal alkyl groups having five carbon atoms, or (c) alkyl groups having 6-20 carbon atoms.

Abstract: The invention relates to a process for the production of a catalyst component for use in the polymerization of .alpha.-olefins, which comprises reacting titanium tetrachloride with a dialkylaluminum monohalide and monoalkylaluminum dihalide, said dialkylaluminum monohalide being in a proportion of at least equimolar to said titanium tetrachloride, to thus obtain a violet reduced solid, then removing aluminum compounds contained in said reduced solid and further activating with a mixture or complex of titanium tetrachloride and a dialkyl ether of the general formula ROR' wherein R and R' are the same or different and are (a) alkyl groups having 1-4 carbon atoms, (b) normal alkyl groups having 5 carbon atoms or (c) alkyl groups having 6-20 carbon atoms and to a catalyst component prepared by the process of the invention.