JPS6210249B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a thermoplastic polymer composition that has good moldability and provides a molded product with excellent transparency and surface gloss. The gist of the invention is a thermoplastic polymer composition comprising bisamide. Thermoplastic polymers are used in a wide range of fields due to their excellent properties. There are still points to be improved in terms of properties and surface gloss. In the past, various proposals have been made to incorporate bisamides into thermoplastic polymers for the purpose of improving their moldability and physical properties.
No. 852487, Special Publication No. 38-20723, No. 44-9825,
44-30448, etc.) and bisamide of paraphenylene diamine or 1,4-diaminocyclohexane (Japanese Patent Publication No. 47-24254). Although these bisamides are quite effective, they do not provide sufficient improvement in transparency or gloss. As a result of extensive studies on a wide range of bisamide compounds, the present inventors discovered that higher fatty acid bisamides such as bis(4-aminocyclohexyl)methane (PACM) exhibited remarkable effects compared to conventionally known bisamides, and arrived at the present invention. This is what I did. In the bisamide of PACM in the present invention, the PACM residue has appropriate flexibility, bulkiness, and steric hindrance, so the crystallization rate and crystal size of the polymer are reduced, and the polymer is transparent and has excellent gloss. It is recognized as giving a molded article. The bisamide in the present invention is obtained from PACM and higher fatty acid. PACM has structural isomers, but the isomer ratio of PACM used for bisamide synthesis is not particularly limited. PACM obtained by distilling a reaction product obtained by hydrogenating bis(4-aminophenyl)methane can be used as is.
The isomer ratio can be changed depending on the hydrogenation conditions, but under conditions that give a high yield of PACM, the trans-trans form is approximately 50%, and the cis-trans form is approximately 40%.
%, and approximately 10% cis-cis form, which is usually used. The higher fatty acids used in the synthesis of bisamides are preferably those having 10 to 20 carbon atoms, and specific examples include lauric acid, myristic acid, palmitic acid, and stearic acid. The amount of bisamide is usually 0.05 to 5% by weight, preferably 0.1 to 2% by weight of the polymer, and is appropriately determined within this range depending on the type of polymer and the type of molded product. If the amount of bisamide is too large, it will phase separate from the polymer, impairing the appearance of the molded product, and if it is too small, the effect will be insufficient. The composition of the present invention can be obtained by blending bisamide of PACM into a thermoplastic polymer at any time before its molding. or by mixing or impregnating a bisamide into a pellet-like polymer. Further, pigments, antistatic agents, fillers, heat resistant agents, light resistant agents, etc. can be added to the composition of the present invention as required. The thermoplastic polymer in the present invention may be any material as long as it can be melt-molded, and specific examples include polyamides such as nylon 6, nylon 66, nylon 12, nylon 610, and nylon 6/66, and polyethylene terephthalate. , polyesters such as polypropylene terephthalate and polybutylene terephthalate, polyolefins such as polyethylene and polypropylene, polystyrene, polyvinyl chloride, polycarbonate, and acrylonitrile/butadiene/styrene polymers. The composition of the present invention is also useful for producing extrusion molded products and injection molded products such as filaments and films. In particular, the polyamide monofilament obtained by extrusion molding the composition of the present invention by a conventional method not only has excellent transparency and surface gloss, but also has excellent mechanical properties such as strength and elongation, making it an extremely commercial product. It is of high value. Next, the present invention will be specifically explained using Examples and Comparative Examples. Example 1 Medium-density polyethylene pellets (“Neozex 3510F” manufactured by Mitsui Petrochemical Industries, Ltd.) were impregnated with 0.3% by weight of PACM stearic acid bisamide (melting point 172°C), and 500mm T- It was extruded through a die and cooled and solidified using a casting roll at 60°C to obtain a film with a thickness of 75 μm. As comparative examples, films were obtained in the same manner as in the case where no bisamide was added, when the stearic acid bisamide of ethylenediamine was added, and the case where the stearic acid bisamide of 1,4-diaminocyclohexane was added. Haze (JIS K6714) for these films
The results of measuring the gloss and gloss (JIS Z874) are shown in the table below.

[Table] Example 2 Polybutylene terephthalate molding pellets with an intrinsic viscosity [phenol (50): tetrachloroethane (50), 20°C] of 1.14 were impregnated with 0.5% by weight of palmitic acid bisamide of PACM, and TS-- manufactured by Nissei Plastics Co., Ltd.
A mold for mold releasability test (1/2″
×1/2″×5″, rectangular parallelepiped mold with 0 draft), resin temperature 250℃, mold temperature 90℃, injection time 15
A test piece was molded under molding conditions of 10 seconds, and the mold releasability was evaluated based on the mold cooling time (the time when no traces of dents or bends on the dowel pins were left). The results are shown in the table below along with comparative examples.

[Table] Example 3 Relative viscosity (96% sulfuric acid, 1g/100ml, 25℃)
3.00% nylon 6 pellets were impregnated with 0.3% by weight of PACM stearic acid bisamide, extruded through a 1.2mm diameter nozzle at 260°C using a 30mm extruder, cooled and solidified in a 15°C water bath, and then subjected to wet heat and dry heat. The monofilament was drawn 4.6 times in two steps to obtain a monofilament with a fineness of 880d. The obtained monofilament has a tensile strength of 5.8 g/
It had a d-elongation of 38%, and its transparency and surface gloss were significantly superior to that of 1,4-diaminocyclohexane containing stearic acid bisamide.

Claims (1)

[Scope of Claims] 1. A thermoplastic polymer composition comprising a thermoplastic polymer and a higher fatty acid bisamide of bis(4-aminocyclohexyl)methane. 2. The composition according to claim 1, wherein the thermoplastic polymer is polyamide. 3. The composition according to claim 1 or 2, wherein the bisamide accounts for 0.05 to 5% by weight of the thermoplastic polymer.