Mitsubishi Gas Chemical Company, Inc.

Thai Polyacetal Co., Ltd.

Daisuke Sunaga

Akira Ito

Takuya Okada

Sunao Mikami

Yupin Pattamamongkolchai

Yuuta Yamamoto

Toru Takahashi

Satoshi Nagai

Kensuke Oshima

Tsutomu Miyoshi

Akira Okamura

Daigo Nakaya

Daisuke Kobayashi

Yumi Okui

Kohsuke Togashi

Wandee Thuamthong

Mika Nakashima

Masato Hirooka

Sanit Palaharn

The present invention provides a polyacetal resin composition, which comprises a polyacetal resin, and which further comprises the following (A), (B) and (C), with respect to 100 parts by weight of the polyacetal resin: (A) 0.05 to 5.5 parts by weight of a low-density polyethylene having a melt flow rate of 1.0 to 50 g/10 minutes (190° C., 2.16 kg), (B) 0.05 to 2.0 parts by weight of a fatty acid compound (excluding calcium stearate), and (C) 0.001 to 1.0 part by weight of a layered double hydroxide represented by the following general formula (1): [(M)(M)(OH)](A)(HO) (1) (wherein, in the general formula (1), Mrepresents a divalent metal ion, Mrepresents a trivalent metal ion, Arepresents an n-valent anion, wherein one or more of the anions are contained in the layered double hydroxide, x represents a number in the range of 0<x≤ 6.0, n represents 1, 2, or 3, and y and z each represent a number of 0 or greater).

Polyacetal resin composition, extrusion-molded article, and injection-molded article

An oxymethylene-copolymer manufacturing method includes: polymerizing a polymerization raw material containing trioxane and a comonomer in the presence of an acid catalyst in a quantity that is 1.0×10moles to 5.0×10moles with respect to 1 mole of trioxane; adding a hydroxylamine compound represented by general formula (1) (in the formula, Rand Rare, independently of each other, a hydrogen atom or an organic group having 1-20 carbon atoms) to a reaction product obtained during the polymerizing of the polymerization raw material at 50-5000 times the quantity of the acid catalyst, in terms of the molar quantity, and mixing the hydroxylamine compound with the reaction product; and subjecting the mixture of the reaction product and the hydroxylamine compound, which is obtained during the adding of the hydroxylamine compound, to an additional melt-kneading.

Oxymethylene-copolymer manufacturing method

An oxymethylene copolymer resin composition, which includes (i) an oxymethylene copolymer, (ii) a derivative of an aryl boron fluoride compound, and (iii) a layered double hydroxide; and a method for producing the same.

Oxymethylene copolymer resin composition and method for producing same

The present invention provides a method for producing an oxymethylene copolymer resin composition, comprising: adding to an oxymethylene copolymer (A), an Mn micromole of an amine-substituted triazine compound (B) per gram of the oxymethylene copolymer (A), an Mc micromole of a choline hydroxide (C) per gram of the oxymethylene copolymer (A), and 0.05 to 1.1 parts by weight of an antioxidant (D) with respect to 100 parts by weight of the oxymethylene copolymer (A), and melt kneading a mixture of the oxymethylene copolymer (A), amine-substituted triazine compound (B), the choline hydroxide (C), and the antioxidant (D), wherein Mn (&#x3bc;mol/g-POM) and Mc (&#x3bc;mol/g-POM) satisfy: 6.5&#x3c;(Mn+Mc&#xd7;8)&#x3c;25, 0.5&#x3c;Mn&#x3c;7.0, and 0.0&#x3c;Mc.

Method for producing oxymethylene copolymer resin composition, and oxymethylene copolymer resin composition

A method for producing a polyacetal fiber that presents an improved whiteness unevenness is provided. According to one embodiment, there is provided a polyacetal fiber production method that yields a polyacetal fiber using an oxymethylene copolymer having a melt index, at 190&#xb0; C. under a load of 2.16 kg, of 5-60 g/10 min, wherein the production method includes taking off the polyacetal fiber from the discharge nozzle of a spinning apparatus, and drawing the taken-off polyacetal fiber. The tensile elongation E1 of the polyacetal fiber after the taking off is 20%-500%; the tensile elongation E2 of the polyacetal fiber after the drawing is 10%-100%; E1&#x2265;E2; and the single fiber thickness of the polyacetal fiber after the drawing is 0.7-5.0 denier.

Method for producing polyacetal fiber

The present invention addresses the problem of providing a method for producing an oxymethylene copolymer, which is capable of producing an oxymethylene copolymer having a high molecular weight with high yield and high economic efficiency. This problem is able to be solved by a method for producing an oxymethylene copolymer, in which a copolymer starting material containing a trioxane and a comonomer is subjected to a polymerization reaction in the presence of a polymerization initiator that contains an acidic compound (A), and wherein: the copolymer starting material contains a basic compound (B); an acidic compound (C) that is different from the acidic compound (A) is added into the copolymer starting material before performing the polymerization reaction, thereby causing a reaction between the basic compound (B) and the acidic compound (C) in advance; and the polymerization reaction is carried out by means of melt polymerization.

Method for producing oxymethylene copolymer

The present invention provides a method for manufacturing a polyacetal fiber in which whiteness irregularity is improved. One embodiment of the present invention provides a method for manufacturing a polyacetal fiber, wherein the method includes a discharge step, a takeup step, a stretching step, and a winding step, the steps being continuously performed, an oxymethylene copolymer being used as the raw material of the polyacetal fiber, the oxymethylene copolymer having an oxymethylene unit and an oxyethylene unit, the content of the oxyethylene unit being 0.5-7.0 moles to 100 moles of the oxymethylene unit, the roller temperature of a stretching unit used in the stretching step being 130-155&#xb0; C., and operation parameters of the method being set so as to satisfy a prescribed numerical formula.

Method for manufacturing polyacetal fiber

The purpose of the present invention is to provide: a polyacetal resin composition which is excellent in terms of impact resistance, thermal stability, and releasability; and a process for producing the polyacetal resin composition. The polyacetal resin composition comprises 100 parts by mass of a polyacetal resin (A) in which the molecular chain has neither a crosslink nor a branch therein, 0.01-10.0 parts by mass of an antioxidant (B), 0.01-5.0 parts by mass of a nitrogenous compound (C), and 0.05-1.0 parts by mass of a fatty acid amide (D), and has a melt index, as measured in accordance with ISO 1133, of 0.5-1.5 g/10 min. A process for producing the polyacetal resin compositions is also provided.

Polyacetal resin composition and method for producing the same

It has been desired to develop a method for producing an oxymethylene polymer, by which an oxymethylene polymer having a high polymerization degree can be produced with high efficiency while suppressing increase in the amount of generation of an odor. Further, it has been desired to develop an oxymethylene polymer resin composition, wherein generation of an odor at the time of molding or after molded to obtain a molded body is suppressed. The present invention provides a method for producing an oxymethylene polymer, wherein the oxymethylene polymer is produced by polymerizing a cyclic oligomer of formaldehyde, and wherein a boron trifluoride compound and an aryl fluoride boron compound are used as polymerization catalysts. The present invention also provides an oxymethylene polymer resin composition containing an oxymethylene polymer and a derivative of an aryl fluoride boron compound.

Method for producing oxymethylene polymer and oxymethylene polymer resin composition

The present invention provides a polyacetal resin composition comprising (A) a polyacetal resin and (B) zinc oxide, wherein the content of oxyalkylene constituent units other than an oxymethylene group in the polyacetal resin (A) is 0.1% by mass or more, and wherein the total surface area of the zinc oxide (B) in the polyacetal resin composition is 0.1 to 40 mper 100 g of the polyacetal resin (A); as well as an article molded therefrom.

Polyacetal resin composition and article molded therefrom

The present invention is to provide a process for producing an oxymethylene copolymer, in which deteriorate due to oxidation hardly occurs, an amount of formaldehyde generated from the product when stored for a long time under environment of high temperature and high humidity is reduced, and occurrence of mold deposit during molding is small. A process for producing an oxymethylene copolymer includes Step 1 of polymerizing polymer raw materials containing trioxane and a comonomer in the presence of a specific amount of an acid catalyst, Step 2 of adding a hydroxylamine compound represented by the following general formula (1): to a product obtained in the Step 1 in an amount of 1 to 20-fold mol based on an amount of the acid catalyst and mixing these, andStep 3 of further melting and kneading a mixture of the product and the hydroxylamine compound obtained in the Step 2.

Process for producing oxymethylene copolymer

A method for producing an oxymethylene copolymer which gives molded articles that are inhibited from emitting formaldehyde and can be reduced in yellowness is provided. In producing an oxymethylene copolymer, an effective polymerization initiator amount is regulated to a value within a given range, the amount being calculated from the amount of perchloric acid or a derivative thereof contained in the polymerization initiator and the amount of triethanolamine contained in all the monomers comprising trioxane and comonomers, which are starting materials for the copolymer.

A polyacetal resin composition and a molded product thereof are provided which are excellent in thermal stability, little elution of components of the resin composition upon brought into contact with fuel, and good releasability from the mold at the time of molding, and which is excellent in the points of thermal stability, fuel oil resistance and mold releasability. Provided is a polyacetal resin composition which includes (A) a polyacetal resin and (B) a mold release agent, (B) the mold release agent is a polyolefin-based wax and/or a polytetrafluoroethylene-based wax, and a content of (B) the mold release agent in the polyacetal resin composition is 0.01 part by mass or more and 1.0 part by mass or less based on 100 parts by mass of (A) the polyacetal resin.

Polyacetal resin composition and molded product thereof

A cloth containing a fiber having on a surface a polyacetal copolymer containing a prescribed amount of oxyalkylene unit(s), wherein the cloth exhibits a qvalue of at least 0.2 W/cm, when the cloth is brought into contact with a heat storing plate of 40&#xb0; C. under a contact pressure of 0.098 N/cmin an environment at a temperature of 20&#xb0; C. and at a relative humidity of 65%, is superior in contact cold sensation, colorfastness, quick drying property and gloss.

Cloth having excellent contact cold sensation and colorfastness

The problem to be solved is to provide a process for producing a polyoxymethylene copolymer in a molding machine with a reduced generation of formaldehyde gas. In a process for continuously producing a polyoxymethylene copolymer comprising a step of melt-kneading a crude polyoxymethylene copolymer at a temperature not lower than the melting point thereof, devolatilizing under reduced pressure the formaldehyde gas generated as a decomposition product, subsequently mixing a formaldehyde scavenger containing a hydrazide compound (A) while keeping the copolymer in a molten state and immediately pelletizing the mixture, a dispersed solution obtained by slurry-dispersing said (A) in a diluent (B) having a melting point lower than temperature (Ta) which is the lower of the melting point and the decomposition temperature of (A), within a temperature range not lower than the melting point of (B) and lower than (Ta) is used as the formaldehyde scavenger.

Growing community of inventors

Mie, Japan

Daisuke Sunaga