摘要:
The present invention is to provide a method of producing an adsorbent composed of micro-fibrils, comprising the steps of mixing two synthetic polymers in a mixing ratio of 20/80 - 80/20, both of said polymers being incompatible with each other when they are intimately mixed, subjecting the mixture in molten state to an extrusion molding to shape the article in the form of threads, ropes or films where at least one of the polymers assumes the forms of micro-fibrils, and thereafter treating the shaped article with a solvent which is incapable of dissolving or decomposing one polymer but capable of dissolving or decomposing the other constituent polymer.The polymer adsorbent obtained by the above method is characterized by superior adsorbing activity and high treating efficiency and can be used for a wide range of purpose of adsorption.
摘要:
The present invention provides a magnetic recording medium, which comprises a magnetic layer having ferromagnetic powder dispersed in a binder on a non-magnetic support member, wherein the non-magnetic support member is made of aromatic polyamide, an undercoating layer is provided between said non-magnetic support member and a lower non-magnetic layer, or between the non-magnetic support member and the magnetic layer, said undercoating layer comprising polyamide resin having tertiary amino group and containing repeated structural units expressed by the following formulae (1) and (2).
摘要:
An injection molding method for molding a product having a partly thin portion comprising the steps of: providing a molding die including a slide block disposed in one of male and female dies and having in cross section a dimension corresponding to a dimension of the thin portion of the product; defining a cavity between the male and female dies with maintaining the slide block in a retracted position; injecting a molten resin material into the cavity through a gate; and advancing the slide block to project into the cavity before the resin material is solidified, thereby filling the cavity with the resin material while forming the thin portion.
摘要:
A cobalt-containing ferromagnetic iron oxide powder of which constituent particles each is an aggregate of cobalt-containing ferromagnetic iron oxide micorparticles and has a spherical shape of 5 to 200 .mu.m in diameter has an angle of repose of 35.degree. or smaller and accordingly excellent flowability, as well as to a process for producing the iron oxide powder, are provided. This ferromagnetic iron oxide powder consisting of spherically shaped particles, are easily dispersed in an organic binder to return to the original state of microparticles, and provide improved magnetic characteristics when used as a material for magnetic recording media such as a magnetic tape and the like.
摘要:
A vanity case includes a receptacle and a cover hinged with each other at rear ends thereof, the cover being maintained in a closed position by engagement between latch tongues formed on the receptacle and the cover. The receptacle is formed at the front end with a recess within which is slidably disposed a push piece having a front wall and an arm integrally formed with the front wall through a thin flexible section which permits the arm to tilt relative to the front wall. The upper end of the arm is positioned closely adjacent the lower surface of the cover, and the rear end of the arm abuts against the inner wall defining the recess and, upon rearward movement of the push piece, slides on the inner wall upwardly to tilt the arm whereby the upper end of the arm forces the cover in upward and forward directions to release the engagement of the latch tongues.
摘要:
The disclosed composite fabric, useful as a substratum for artificial leather, comprises a woven or knitted frabic and at least one non-woven fabric firmly bonded to the woven or knitted fabric, and is produced by providing a precursory sheet with two or more layers from a woven or knitted fabric and one or more fibrous webs which consist of numerous extremely fine fibers having an average diameter of from 0.1 to 6.0 microns, and uniformly impacting the fibrous web surface of the precursory sheet with numerous fluid jets ejected under a high pressure of from 15 to 100 kg/cm.sup.2, at a ratio of a total impact area of the fluid jets on the precursory sheet surface to an area of the precursory sheet surface to be impacted of at least 1.5, in order to allow the extremely fine fibers in the fibrous web to randomly entangle with each other and also to allow a portion of the extremely fine fibers to penetrate into the inside of the woven or knitted fabric and entangle with a portion of the fibers in the woven or knitted fabric.
WHEREIN, A1 AND A2 ARE SAME OR DIFFERENT AND EACH DENOTES A POLYALKYLENE OXIDE SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE OXIDE
-(O-CH2-CH2)N-
POLYPROPYLENE OXIDE
-(O-CH(-CH3)-CH2)N-
AND POLYETHYLENE OXIDE-POLYPROPYLENE OXIDE COPOLYMER
-(O-CH2-CH2)M- -(O-CH(-CH3)-CH2)N
WHEREIN N IS AN INTEGER OF 1 TO 200 AND M+N IS AN INTEGER OF 2 TO 200 (M AND N$1); R3 AND R4 ARE SAME OR DIFFERENT AND EACH DENOTES A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALKYLENE OF 1 TO 12 CARBON ATOMS, O- AND PCYCLOHEXYLENE, O- AND P-METHYLENE CYCLOHEXYLENE, O- AND P-PHENYLENE, AND O- AND P-METHYLENE PHENYLENE; M DENOTES A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, A METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM, BARIUM, MAGNESIUM, TIN, ALUMINUM, COPPER, POTASSIUM, SODIUM, ZINC, MANGANESE, NICKEL, STRONTIUM AND CADMIUM, AND AN ORGANIC AMINE SELECTED FROM THE GROUP CONSISTING OF MONO-, DI- AND TRI-ETHANOL AMINES, AND PRIMARY, SECONDARY AND TERTIARY AMINES OF 1 TO 17 CARBON ATOMS; X AND Y EACH DENOTES AN INTEGER OF 1 TO 4 DEPENDING ON THE VALENCY OF THE METAL; P IS AN INTEGER OF 2 TO 5; AND R5 AND R6 ARE SAME OR DIFFERENT AND EACH DENOTES A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROXY, ALKOXY OF 1 TO 10 CARBON ATOMS, NAPHTHOXY, BENZOXY, SECONDARY AMINO OF 1 TO 17 CARBON ATOMS, AND
-OOC-R7
WHEREIN R7 DENOTES A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALKYL OF 1 TO 17 CARBON ATOMS, PHENYL, PCARBOXY PHENYL
4-(HOOC-)PHENYL
AND NAPHTHYL PREPARED BY ALCOHOL INTERCHANGE REACTION BETWEEN SODIUM OR POTASSIUM SALT OF DI-(OR MONO) ALKOXYMONO- (OR DI-RESPECTIVELY)-W-AMINOACID-SYN-TRIAZINE AND POLYALKYLENE GLYCOL OR DERIVATIVE THEREOF, ARE SUPERIOR ANTISTATIC AGENTS FOR POLYMER MATERIALS SUCH AS POLYAMIDES, POLYESTERS, POLYOLEFINES, POLYSTYRENE, POLYVINYL CHLORIDE, POLYVINLIDENE CHLORIDE, POLYMETHYLMETHACRYLATE, POLYACRYLONITRILE BUTADIENE STYRENE TERPOLYMER.
摘要:
A magnetic recording medium comprising: a magnetic layer containing ferromagnetic powder and a binder; a nonmagnetic support; and a back coat layer, in this order, wherein the nonmagnetic support contains polyester having an intrinsic viscosity of from 0.40 to 0.60 dl/g and a number average molecular weight of from 12,000 to 24,000, a surface of the magnetic layer on a side not having the nonmagnetic support has a surface roughness Ra of from 1 to 5 nm, and a surface of the back coat layer on a side not having the nonmagnetic support has a surface roughness Ra of from 6 to 20 nm.
摘要:
A magnetic recording medium comprising: a nonmagnetic support; an undercoat layer containing a compound polymerizable by radiation exposure; and a magnetic layer containing ferromagnetic powder and a binder, in this order wherein the undercoat layer has a thickness of from 0.1 to 1 μm, the binder contains a polyurethane resin having a glass transition temperature of from 100 to 200° C., the magnetic layer has a thickness of from 20 to 150 nm, and an average particle size of the ferromagnetic powder is from 20 to 60 nm.
摘要:
A magnetic recording tape favorably employable for computer data storage has a flexible polymer web, a magnetic recording layer arranged on one surface side of the web, and a backing layer arranged on another surface side of the web, characterized in that the recording tape has a thickness of 2 to 8 .mu.m and shows a Young's modulus of not less than 1,200 kg/mm.sup.2 in its longitudinal direction; and the backing layer has a thickness of 0.2 to 1 .mu.m and is composed of a binder, a carbon black, a non-magnetic powder I having Mohs' scale of hardness of 3 to 4.5 and another non-magnetic powder II having Mohs' scale of hardness of 5 to 9. Between the magnetic layer and the flexible polymer web, a non-magnetic undercoating layer composed of a binder and a non-magnetic powder can be provided.