Abstract:
PROBLEM TO BE SOLVED: To provide a polyamide resin composition for an IC tray which, while having low water absorbency, achieves a sufficiently high molecular weight, has a wide moldable temperature range calculated from the difference between the melting point and the thermal decomposition temperature thereof, has excellent melt moldability and excellent electrical conductivity, and is more excellent in heat resistance, chemical resistance, hydrolysis resistance and the like as compared with conventional aliphatic polyamide resins. SOLUTION: The polyamide resin composition for an IC tray contains an electrical conductivity-imparting agent in a polyamide resin wherein the dicarboxylic acid component is composed of oxalic acid and the diamine component is composed of a mixture of 1,9-nonanediamine and 2-methyl-1,8-octanediamine (hereinafter called a C9 diamine mixture) and 1,6-hexanediamine (hereinafter called C6 diamine). The molar ratio between the C9 diamine mixture and C6 diamine is from 1:99 to 99:1. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a transparent member using a polyamide resin excellent in chemical resistance, hydrolysis resistance, and the like, particularly excellent in transparency, as compared with a conventional aliphatic polyamide resin, without impairing low water absorption properties seen in a linear aliphatic polyoxamide resin. SOLUTION: The transparent member using a polyamide resin, which has a high molecular weight, is excellent in melt molding properties due to a large difference between the melting point and thermal decomposition temperature, and is excellent in chemical resistance and hydrolysis resistance, particularly excellent in transparency as compared with a conventional aliphatic polyamide resin, without impairing low water absorption properties seen in a linear aliphatic polyoxamide resin, can be obtained by using an oxalic acid diester as a source of oxalic acid and using, as a diamine component, a mixture of 1,9-nonane diamine and 2-methyl-1,8-octane diamine, wherein the molar ratio of 1,9-nonane diamine to 2-methyl-1,8-octane diamine is 40:60 to 99:1. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for controlling the molecular weight of a polyoxamide resin, which conventional production methods of the polyoxamide resin failed to achieve. SOLUTION: In the production method to obtain the polyoxamide resin by a polycondensation reaction of a diester of oxalic acid and a diamine, the method for controlling the molecular weight of the polyoxamide resin sets the temperature of contents upon initiation of mixing of raw materials to a predetermined temperature within the range of 20-240°C according to the target molecular weight. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To obtain a polyamide resin composition having a slow crystallizing rate and good drawability while hardly causing the reduction of the melting point of the polyamide component constituting the main component. SOLUTION: This polyamide resin composition comprises 100 pts.wt. polyamide resin and 0.05-10 pts.wt. rhodinic acids.
Abstract:
PROBLEM TO BE SOLVED: To provide a membrane containing agar and/or agarose and having a small dispersion of membrane thickness and a good surface smoothness, and its manufacturing method. SOLUTION: A mixture formed by adding sericin to a compound containing agar and/or agarose, and water as occasion demands is made into a sheet-like gel. Thereafter, while a load of 0.01-2 kgf/cm2 is applied to the sheet-like gel, the sheet-like gel is dried at 0-40 deg.C to obtain a membrane containing the agar and/or the agarose. A porous material and/or a water absorbing material are laminated on one side or both sides of the sheet-like gel comprising the mixture which contains the compound containing the agar and/or the agarose and the cericin. The laminate gel and material are dried at 0-40 deg.C while a load is being applied. Thereafter, by removing the porous material and/or the water absorbing material, the membrane containing the agar and/or the agarose can be more effectively manufactured.
Abstract:
PROBLEM TO BE SOLVED: To provide a polyamide having excellent drawability and especially suitable for successive biaxial drawing. SOLUTION: The objective polyamide contains a unit composed of a lactam and/or an aminocarboxylic acid, a unit composed of a dicarboxylic acid and a unit composed of a diamine containing norbornanediamine. Concretely, the polyamide contains 50-99.8 mol% lactam and/or aminocarboxylic acid, 0.1-25 mol% dicarboxylic acid and 0.1-25 mol% diamine. Norbornanediamine accounts for 10-100 mol% of the diamine.
Abstract:
PROBLEM TO BE SOLVED: To obtain a polyamide excellent in stretchability especially successive biaxial stretchability. SOLUTION: This polyamide comprises a diamine and a dicarboxylic acid including a 6-22C branched and saturated carboxylic acid as essential components. The preferable composition is 50-99.95 mol% lactam and/or aminocarboxylic acid, 0.025-25 mol% diamine and 0.025-25 mol% dicarboxylic acid wherein 5-100 mol% of the dicarboxylic acid is a 6-22C branched and saturated carboxylic acid. As the 6-22C branched and saturated carboxylic acid, 1,6-decanedicarboxylic acid is preferable.
Abstract:
PROBLEM TO BE SOLVED: To provide a polyamide resin which can give a molding undergoing little change in its transparency and shape even when subjected to treatment with boiling water for a long time. SOLUTION: This resin a polyamide resin comprising units derived from (A) a dicarboxylic acid and units derived from (B) a diamine, wherein the carboxylic acid A comprises 50-100 mol.% units derived from (A-1) a 6-22C branched saturated dicarboxylic acid and 0-50 mol.% units derived from (A-2) isophthalic acid, and diamine B is a diamine represented by the formula [wherein R1 is a hydrocarbon group of the formula: CnH2n (wherein n=1-3); and R2 and R3 are each H or hydrocarbon group of the formula: CnH2n+1 (wherein n=1-3)], and the ratio of the number of moles of (A) to the number of moles of (B) is 100:95 to 100:105, or a polyamide resin comprising units derived from (C) an aliphatic aminocarboxylic acid and/or a lactam and units A and B, wherein C is used in an amount of above 0 to below 30 mol per 100 mol of the total of A and B.
Abstract:
PROBLEM TO BE SOLVED: To obtain a polyamide which does not become cloudy in heat treatment, is excellent in clarity, and is soluble in a lower alcohol, etc., by selecting a polyamide comprising units derived from a dicarboxylic acid component mainly comprising 1,6-decanedicarboxylic acid, units derived from a diamine component, and units derived from an aliph. aminocarboxylic acid component and/or units derived from a lactam component. SOLUTION: This polyamide is produced by a two-stage polymn. process comprising the first polymn. step conducted at 160-320 deg.C under 0-50 kgf/cm G to produce a polyamide prepolymer having a number average mol. wt. of 800-5,000 and the second polymn. step conducted at 160-320 deg.C under 10-760 mmHg to produce a polyamide having a number average mol.wt. of 7,000-50,000. 50-100 wt.% of the dicarboxylic acid component is 1,6-decanedicarboxylic acid. An example of the diamine used is 1,4-diaminobutane; that of the aliph. aminocarboxylic acid, ε-aminocaproic acid; and that of the lactam, ε- caprolactam.
Abstract:
PROBLEM TO BE SOLVED: To obtain a process for producing a polyamide which has m- xylylenediamine units as essential units, does not gel nor yellow, and has a homogeneous quality and a good film-forming properties by using specific components. SOLUTION: An oligomer having a number average mol.wt. of 1,000 or higher and comprising 25-50mol% diamine units comprising 20-100mol% units derived from m-xylylenediamine and 0-80mol% units derived from an aliph. and/or alicyclic diamine having a 4-18C alkylene group, 25-50mol% dicarboxylic acid units comprising 10-80mol% units derived from an arom. dicarboxylic acid represented by the formula (wherein Ar is a 6-14C arom. hydrocarbon group) and 20-90mol% units derived from a 6-18C linear aliph. dicarboxylic acid, and 0-50mol% 4-12C aliph. ω-aminocarboxylic acid units is produced by the prepolymn. at 220 deg.C or lower. The oligomer is subjected to melt polymn. at a temp. at least 10 deg.C higher than the m.p. of the resulting polymer but not higher than 280 deg.C and/or is subjected to solid phase polymn. at a temp. not lower than the glass transition point of the polymer but at least 10 deg.C lower than the m.p.