JPS6365709B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polyamide-based thermoplastic resin composition, and in particular to a strong thermoplastic resin obtained by adding a polyether esteramide elastomer to a resin composition consisting of a polyamide resin and a polyolefin-based ionomer resin. Regarding the composition. Regarding conventional compositions consisting of polyamide resin and ionomer resin, for example, Japanese Patent Publication No. 52-26897,
It is known from JP-A-53-80014 and JP-A-53-120761. It is true that polyamide resins and ionomer resins are known to have relatively good compatibility, but in polymer blend systems where a large amount of ionomer resin is mixed with polyamide resin, the compatibility is not necessarily good and there is a tendency for phase separation. A decrease in physical properties is observed. Furthermore, the dispersion state of both resins is not necessarily stable depending on the mixing conditions, making it difficult to obtain a composition with stable physical properties. In order to overcome these difficulties, the present inventors improved the compatibility of polyamide resin and ionomer resin,
As a result of continuing studies to obtain a strong composition with stable physical properties, we found that polyetheresteramide elastomer was added to 100 parts by weight of a resin composition consisting of 95 to 50% by weight of polyamide resin and 5 to 50% by weight of polyolefin ionomer resin. The present invention was achieved by discovering that by adding 5 to 50 parts by weight, a tough thermoplastic resin composition with stable physical properties can be obtained. The polyamide resin used in the present invention is a polyamide resin obtained from ω-aminocarboxylic acid or lactam having 10 or more carbon atoms, such as nylon 11, nylon 12, etc., or a polycondensation polyamide consisting of diamine and dicarboxylic acid. A polyamide resin in which at least one or both of diamine and dicarboxylic acid has 10 or more carbon atoms, such as nylon 6,10, nylon 6,
12, etc., and copolyamide resins containing the above polyamide resin as at least one component, such as nylon 12/nylon 6 copolyamide, nylon 12/nylon 6,10/nylon 6 copolyamide, etc. alone or as a mixture. However, it may also contain a plasticizer, weather-resistant stabilizer, heat-resistant stabilizer, dye and pigment, and inorganic filler. Polyolefin ionomer resins are, as is well known, made from olefin monomers in which ethylene and ethylene are partially or completely replaced with monoolefins such as propylene, butene, and pentene, and monomers containing carboxyl groups such as acrylic acid and methacrylic acid. This is a resin made by adding monovalent or divalent metal salts such as sodium salts and zinc salts to the copolymer to create ionic bonds in the carboxyl moieties. Therefore, it is natural to use conditions that generate ionic bonds, for example, a copolymer consisting of an olefinic monomer and a monomer containing a carboxyl group is used in the presence of an additive that generates ionic bonds, such as zinc acetate or sodium methoxide. cases are also included. Polyether ester amide elastomer is an elastomer mainly composed of polyamide obtained from ω-aminocarboxylic acid or lactam having 10 or more carbon atoms.
This is an elastomer disclosed in Publication No.-119997. That is, ω- with 10 or more carbon atoms
This is a thermoplastic polyether ester amide obtained by pressurizing and heating a compound having polyamide-forming properties consisting of an aminocarboxylic acid or a lactam and α,ω-dihydroxypolyether in the presence of an organic dicarboxylic acid. In carrying out the present invention, equipment generally used in industry, such as a kneading roll or a kneading machine such as a Banbury mixer, is used to mix the polyamide resin, polyolefin ionomer resin, and polyether ester amide elastomer.
Alternatively, pellets or flakes of the respective component resins may be mixed in advance in a mixer such as a tumbler or a Henschel mixer, and then melt-mixed in an extruder. In this case, a co-kneader type extruder or a twin-screw type extruder can also be effectively used. The mixing ratio of each component resin is polyamide resin 95
5 to 50 parts by weight of a polyetheresteramide elastomer per 100 parts by weight of a resin composition consisting of 5 to 50% by weight, preferably 90 to 60% by weight of a polyolefin ionomer resin and 5 to 50% by weight, preferably 10 to 40% by weight of a polyolefin ionomer resin. Parts by weight are preferably selected from 10 to 40 parts by weight. In the case of a base polymer consisting of 95% by weight or more of polyamide resin and 5% by weight or less of polyolefin ionomer, no effect of blending the polyolefin ionomer can be seen;
In the case of a base polymer consisting of 50% by weight or more of the following and a polyolefin ionomer resin, the matrix of the composition becomes a polyolefin ionomer and the characteristics of the polyamide resin are lost, which is not preferable. Furthermore, if the polyether ester amide elastomer added to increase the compatibility of these base polymers is less than 5 parts by weight with respect to 100 parts by weight of the base polymer, no effect of improving the compatibility can be expected, and if it exceeds 50 parts by weight, the polyamide resin The dispersed particle size of the polyolefin ionomer dispersed in the matrix becomes too large and does not provide a sufficiently tough composition. Therefore, the appropriate proportion of polyether ester amide is 5 to 50 parts by weight per 100 parts by weight of the base polymer.
When 10 to 40 parts by weight of the polyolefin ionomer resin is added, the polyolefin ionomer resin is uniformly dispersed in the polyamide resin matrix with a particle size on the order of 1 micron or less, providing a tough thermoplastic resin composition. Needless to say, this thermoplastic resin composition contains talc, clay,
Various inorganic fillers such as mica, glass beads, and glass fibers, stabilizers to impart weather resistance and heat resistance, plasticizers to impart flexibility, lubricants to improve moldability, and coloring agents. Necessary dyes and pigments, fluorescent brighteners, etc. can be blended. Next, the application of the present invention will be specifically shown in Examples. Example 1 Nylon 12 homopolymer (relative solution viscosity measured at 25°C in 0.5% m-cresol solution: 2.1) 80
Weight% and commercially available ionomer resin “Surlyn”
Mixed pellets consisting of 20% by weight of AD8102” (DuPont product, melt index 14g/10min)
100 parts by weight of polyether ester amide (0.5%
25 parts by weight of pellets with a relative solution viscosity of 2.0 (measured in m-cresol solution at 25°C) were mixed, and the pellets were heated at 225°C with a Brabender Plastograph at a rotational speed.
The mixture was kneaded for 15 minutes at 50 rpm. After that, press molding was performed at 220°C to create a press sheet with a thickness of 1 mm, and dumbbell test pieces were created to measure tensile properties at a tensile rate of 50 mm/min. The tensile strength at break was 270 Kg/cm ² , the elongation at break was 150%, and the initial tensile modulus was 3300 Kg/cm ² . The polyether ester part of the polyether ester amide used here consists of polyoxytetramethylene glycol with a molecular weight of about 1000 and dodecane diic acid, and the composition of the polyether ester amide is 43% by weight of polylaurolactam, 12% by weight of dodecanedioic acid, It consisted of 45% by weight of polyoxytetramethylene glycol. Examples 2 to 13 Nylon 12 homopolymer (relative solution viscosity: 2.1 measured in 0.5% m-cresol solution at 25°C) was mixed with polyolefin ionomer in the same manner as in Example 1 by changing the mixing ratio and type to produce various mixed pellets. Pellets of polyether esteramide of different compositions were added to the pellets and kneaded using a Brabender Plastograph. In all cases, tough compositions were obtained. The tensile properties are shown in Table 1. Comparative example Nylon 12 homopolymer (relative solution viscosity measured at 25°C in 0.5% n-cresol solution: 2.1) 80
Example 1 was prepared by adding 20 parts by weight of polyethylene ionomer "Himilan 1652" (melt index 5 g/10 min) from Mitsui Polychemical Co., Ltd. to the parts by weight.
The mixture was mixed using a Brabender Plastograph in the same manner as above. Similarly, a 1 mm thick press sheet was prepared and its tensile properties were measured. Breaking strength is 480Kg/cm ² ,
The initial tensile modulus was 6000 Kg/cm ² and the elongation at break was 25%. In other words, a tough composition could not be obtained. 【table】

Claims (1)

[Claims] 1 Polyamide resin obtained from ω-aminocarboxylic acid or lactam having 10 or more carbon atoms and/or polycondensation polyamide consisting of diamine and dicarboxylic acid, in which at least either diamine or dicarboxylic acid has 10 or more carbon atoms 95 to 50% by weight of polyamide resin and 5 to 50% by weight of polyolefin ionomer resin
A polyamide obtained by adding 5 to 50 parts by weight of a polyether ester amide elastomer mainly composed of a polyamide obtained from an ω-aminocarboxylic acid or lactam having 10 or more carbon atoms to 100 parts by weight of a resin composition consisting of thermoplastic resin composition.