Abstract: The present invention provides a polyacetal resin composition having excellent processability and stability, significantly suppressing the amount of formaldehyde generated from the molded article thereof, and preventing the bleeding of blending components. Specifically, to 100 parts by weight of (A) a polyacetal copolymer in which the amount of hemiformal terminal group is 1.0 mmol/kg or less, the amount of formyl terminal group is 0.5 mmol/kg or less, and the amount of unstable terminal group is 0.5% by weight or less, there are added: 0.01 to 3 parts by weight of (B) a hindered phenol-based antioxidant; 0.01 to 1 part by weight of (C) a hydrazide compound; and 0.01 to 1 part by weight of a compound selected from (D) an isocyanate compound, an isothiocyanate compound, and a modified compound thereof.

Abstract: The invention is to provide a polymer, having a high affinity to water, is liquid in spite of being a polymer, simultaneously possesses also a thermal stability and is suitably used as a heating medium or a lubricant. It is the polyacetal (co)polymer, being liquid at room temperature, prepared by copolymerizing (A) 75 to 100 mol % of 1,3-dioxolane and (B) 25 to 0 mol % of trioxane and having the total amount of terminal groups of 15 to 300 mmol/kg and an amount of a hemiformal terminal group of 80 mmol/kg or less.

Abstract: It is a purpose of the present invention to provide a polyacetal resin composition that contains a glass inorganic filler, improves adhesiveness between the glass inorganic filler and the polyacetal resin, and attains excellent mechanical strength. A polyacetal resin composition comprises 100 parts by weight of a polyacetal resin component (A) and 3-200 parts by weight of a glass in organic filler (B), wherein said polyacetal resin component (A) consists of 99.9-80 parts by weight of a polyacetal resin (A1) having hydroxyl groups at 0-20 mmol/kg in the molecule and 0.1-20 parts by weight of a modified polyacetal resin (A2) having hydroxyl groups at 50-2,000 mmol/kg in the molecule.

Abstract: A polyacetal resin composition having high rigidity and also excellent in dimensional stability and creep characteristics is provided. A polyacetal resin composition prepared by blending (A) 99.9 to 90 parts by weight of a linear polyacetal resin having a melt index of 1 to 50 g/min obtained by copolymerizing (a) 99.5 to 97.5% by weight of trioxane and (b) 0.5 to 2.5% by weight of a compound selected from a mono-functional cyclic ether compound and a mono-functional cyclic formal compound, with (B) from 0.1 to 10 parts by weight of a branched or crosslinked polyacetal resin having a melt index of 0.1 to 10 g/min obtained by copolymerizing (a) 99.49 to 95.0% by weight of trioxane, (b) 0.5 to 4.0% by weight of a compound selected from a mono-functional cyclic ether compound and mono-functional cyclic formal compound and (c) 0.01 to 1.

Abstract: The invention is to provide a polymer, having a high affinity to water, is liquid in spite of being a polymer, simultaneously possesses also a thermal stability and is suitably used as a heating medium or a lubricant. It is the polyacetal (co)polymer, being liquid at room temperature, prepared by copolymerizing (A) 75 to 100 mol % of 1,3-dioxolane and (B) 25 to 0 mol % of trioxane and having the total amount of terminal groups of 15 to 300 mmol/kg and an amount of a hemiformal terminal group of 80 mmol/kg or less.

Abstract: To provide a resin material in which various properties such as excellent appearance and rigidity inherent to a polyacetal resin are maintained and to which the antistatic property is given. That is, a branched polyacetal resin composition, comprising 100 parts by weight of a branched polyacetal copolymer (A) having an oxymethylene group as the main repeating unit and having a branching unit represented by the following formula (I), and 0.1 to 30 parts by weight of a compound (B) having a polyalkylene ether unit as the main constituting component and/or 0.01 to 10 parts by weight of an ester (C) of fatty acid with polyhydroxyl alcohol having a hydroxyl group: wherein m and n each is an integer of 0 to 5; the sum of m+n is 1 to 5; and R is a monovalent organic group having a molecular weight of 40 to 1000.

Abstract: To provide a polyacetal resin material in which an excellent sliding property is given and the appearance, dimensional precision, mechanical properties, etc. of the molded article thereof are improved as well. That is, a branched polyacetal resin composition, comprising 100 parts by weight of a branched polyacetal copolymer (A) having an oxymethylene group as the main repeating unit and having a specific branching unit, and 0.5 to 40 parts by weight of at least one polymer (B) selected from the group consisting of the following polymer (B-1) and (B-2), i.e. polymer (B-1): a graft or block copolymer prepared from an olefin polymer (b-1) and at least one vinyl polymer (b-2); and polymer (B-2): a modified olefin polymer in which an olefin polymer (b-3) is modified with at least one compound selected from the group consisting of an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride and derivatives thereof and/or 0.1 to 5 parts by weight of a lubricant (C).

Abstract: To provide a polyacetal resin composition which is highly rigid and has excellent surface hardness, sliding characteristics, etc. That is, a polyacetal resin composition, produced by blending 100 parts by weight of a polyacetal resin (A) with 0.01-100 part(s) by weight of a branched polyacetal copolymer (B) which is obtained by copolymerization of 100 parts by weight of trioxane (a), 0.01-10 part(s) by weight of a monofunctional glycidyl compound (b) and 0-20 part(s) by weight of a cyclic ether compound (c) which is copolymerizable with trioxane.

Abstract: To offer a resin material in which various properties such as excellent appearance and rigidity inherent to a polyacetal resin are maintained and a weather (light) resistance is improved. That is, a branched polyacetal resin composition comprising 100 parts by weight of a branched polyacetal copolymer (A) having an oxymethylene group as the main repeating unit and having a branching unit represented by the following formula (I), 0.01 to 5 parts by weight of a weather (light) resistant stabilizer (B) and 0.01 to 5 parts by weight of a hindered amine substance (C): wherein m and n each is an integer of 0 to 5; the sum of m+n is 1 to 5; and R is a monovalent organic group having a molecular weight of 40 to 1000.

Abstract: To offer a resin material in which various properties such as excellent appearance and rigidity inherent to a polyacetal resin are maintained and a weather (light) resistance is improved. That is, a branched polyacetal resin composition comprising 100 parts by weight of a branched polyacetal copolymer (A) having an oxymethylene group as the main repeating unit and having a branching unit represented by the following formula (I), 0.01 to 5 parts by weight of a weather (light) resistant stabilizer (B) and 0.

Abstract: To provide a resin material in which various properties such as excellent appearance and rigidity inherent to a polyacetal resin are maintained and to which the antistatic property is given. That is, a branched polyacetal resin composition, comprising 100 parts by weight of a branched polyacetal copolymer (A) having an oxymethylene group as the main repeating unit and having a branching unit represented by the following formula (I), and 0.1 to 30 parts by weight of a compound (B) having a polyalkylene ether unit as the main constituting component and/or 0.

Abstract: To provide a process for stable and continuous production of a polyacetal resin, mainly comprising a copolymer of 1,3-dioxolane and trioxane under the presence of a catalyst, in a high yield on an industrial scale for a long period of time. In the continuous production of a polyacetal resin by mixing 1,3-dioxolane with boron trifluoride and/or a coordination compound of boron trifluoride and then, mixing the obtained mixture with trioxane to conduct bulk polymerization in a polymerization machine, 1,3-dioxolane is brought into contact with boron trifluoride and/or a coordination compound of boron trifluoride while feeding both at the same direction and they are mixed together for 0.1 to 30 seconds under the condition of at least 0.1 m/sec of the linear velocity of the mixture and subsequently mixed with trioxane.

Abstract: A branched or crosslinked polyacetal resin is excellent in blow moldability, has impact resistances such as plane impact resistance, and the smoothness of the inner surfaces of moldings produced therefrom, and is suitable for molding, particularly blow molding. It can be produced by the bulk polymerization of (A) trioxane with (B) a cyclic ether and/or cyclic formal and (C) a polyfunctional glycidyl ether compound in the presence of (D) a cationic polymerization catalyst, a mixture prepared by mixing the cyclic ether and/or cyclic formal (B) with the polyfunctional glycidyl ether compound (C) and the cationic polymerization catalyst (D) is added to trioxane (A) to conduct the polymerization.

Abstract: Polyester resins are prepared by reacting a lower alkyl ester of an aromatic dicarboxylic acid with an aliphatic diol to form an aromatic polyester, and which includes (i) subjecting to transesterification reaction conditions in the presence of a titanium compound catalyst a transesterification reaction system having the lower alkyl ester of the aromatic dicarboxylic acid, the aliphatic and between 0.02 to 5.0 mole percent, based on the amount of the lower alkyl ester of the aromatic dicarboxylic acid, of an aromatic sulfonic acid compound represented by the following general formula (I):OH--R--O--Ar--SO.sub.3 M (I)wherein Ar is a p-substituted benzene group or a 2,6-substituted naphthalene group, R is a divalent group selected from among --CH.sub.2 CH(CH.sub.3)--, --CH(CH.sub.3)CH.sub.2 --, --CH.sub.2 CH(CH.sub.3)-- and --CH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 --, and M is an alkali metal selected from the group consisting of lithium, sodium and potassium.

Abstract: Moldable polyester resin compositions and molded articles therefrom include, based on the total weight of all resin components:(A) between 2 to 98% by weight of a compatibilizing metal sulfonate group-containing aromatic polyester copolymer which is the polycondensation reaction product of (a) an aromatic dicarboxylic acid or its ester-forming derivative, (b) a diol compound or its ester-forming derivative, and (c) an ester-forming compound containing a metal sulfonate group;(B) between 2 to 98% by weight of an additive resin which is one of (B-I) an olefin copolymer which is the copolymerization reaction product between an olefin with at least one of an .alpha.,.beta.-unsaturated carboxylic acid or its derivative and a vinyl alcohol or its ester, and (B-II) a polyamide resin; and, optionally(C) between 0 to 96% by weight of a non-compatibilizing aromatic polyester resin.

Abstract: A modified polyester resin is the reaction product of:(A) an acid component mainly comprised of terephthalic acid, 2,6-naphthalene dicarboxylic acid or a lower alcohol ester thereof,(B) a diol component mainly comprising an alkylene glycol having 2 to 8 carbon atoms, and(C) an aromatic sulfonic acid compound of the following general formula (1):HO(RO).sub.n --Ar--SO.sub.3 M (1)where Ar represents a benzene or naphthale ring, n represents an integer from 1 to 10, R represents a group selected from among alkylenes having 2 or 3 carbon atoms and when n is 2 or more, R may be the same as or different from one another, and M represents an alkali metal selected from lithium, sodium and potassium. The modified polyester resin also satisfies the following formulas (2) and (3):0.25.ltoreq.x.ltoreq.100 (meq/kg) (2)2.ltoreq.(x/CEG).times.100.ltoreq.

Abstract: A transparent polyester container is produced by melt-molding a copolyester resin containing 75 to 98 molar % of repeating units of an ester of terephthalic acid with 1,4-butanediol with the balance mainly containing repeating units of an ester of terephthalic acid with an alkylene oxide adduct of a bisphenol compound, rapidly cooling the molding to prepare a sheet having a low crystallinity, maturing the sheet at a temperature selected so as to meet a requirement represented by the following formula (1) to prepare a sheet satisfying a requirement represented by the following formula (2) and subjecting the sheet to thermoforming through the use of a cavity mold at a temperature falling within a range represented by the following formula (3):______________________________________ Ta .ltoreq. Tcc (.degree.C.) (1) (.DELTA.Hcc).sub.a .gtoreq. 5 (J/g) (2) Tcc + 2 .ltoreq. Tb .ltoreq. Tm - 2 (.degree.C.) (3) ______________________________________whereinTa is the maturing temperature (.degree.C.

Abstract: A process for producing a transparent film includes forming a melt from a copolyester having structural units represented by the following formulas I and II, respectively: ##STR1## wherein R groups may be the same or different from each other are each selected from the group consisting of--CH.sub.2 CH.sub.2, --CH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 --, --CH--CH.sub.2 --, ##STR2## and the molar fraction ratio of the structural units of formula II to the total structural units of formulas I and II is between 0.02 to 0.020, which a melt of the copolyester is formed into a film, rapidly quenched to solidify the copolyester and impart low crystallinity thereto. The solidified film is aged at a temperature of 60 degree centigrade or below, and then heat-treated at a temperature between the glass transition point (Tg) of the copolyester and no greater than 2.degree. C. below the melting point of the copolyester minus 2.