JPS5958048A - Methacrylic resin composition - Google Patents

Abstract

PURPOSE:To prepare a composition having remarkably improved solvent resistance and impact strength, by compounding a specific olefin copolymer to a methacrylic polymer composed mainly of methyl methacrylate. CONSTITUTION:100pts.wt. of a methacrylic polymer containing >=50wt%, preferably >=70wt% of methyl methacrylate is compounded with 1-100pts.wt., preferably 3-50pts.wt. of an olefin copolymer composed of an alpha-olefin (preferably ethylene) and an alpha,beta-unsaturated acid glycidyl ester (preferably glycidyl methacrylate). Preferably, 0.001-5pts.wt. of a phosphonium compound, etc. is further added to the composition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a methacrylic resin composition having excellent solvent resistance and impact resistance. Methyl methacrylate resin, which is mainly composed of methyl methacrylate, has excellent transparency, moldability, weather resistance, light weight, and high strength. Taking advantage of these properties, it can be used as covers for lighting, meters, and electrical equipment. It is used for things such as ka;-.

However, methacrylic resin, which is mainly composed of methyl methacrylate, has the drawbacks of poor solvent resistance and insufficient impact resistance, so these drawbacks are problematic in terms of applications. There was a problem that it could not be applied to

In order to improve these shortcomings, methods such as blending various polymers with methacrylic resin have been considered, but improvements in one property do not result in a decrease in other properties, so the results are still unsatisfactory. The reality is that no method has been found to do so.

Therefore, the present inventors conducted extensive studies to solve the above problem, and found that by incorporating a specific olefin copolymer into a methacrylic resin whose main component is methyl methacrylate, The inventors have discovered that the solvent resistance and impact resistance of methacrylic resins can be significantly improved, and have arrived at the present invention.

That is, in the present invention, for 100 parts by weight of a methacrylic polymer containing 50% by weight or more of methyl methacrylate,
This invention relates to a methacrylic resin composition with excellent solvent resistance and impact resistance, which contains 1 to 100 parts by weight of a luolefin copolymer made of an α-olefin and a glyc/dyl ester of an α,β-unsaturated acid. be.

Examples of the methacrylic polymer containing 50% by weight or more of methyl methacrylate used in the present invention include methyl methacrylate homopolymer, methyl methacrylate-methyl acrylate copolymer, methyl methacrylate-methacrylic acid copolymer, methacrylate Methyl methacrylate-acrylic acid copolymer, methyl methacrylate-styrene copolymer, methyl methacrylate-acrylonitrile copolymer, methyl methacrylate-styrene-acrylonitrile copolymer, methyl methacrylate-methacrylic acid copolymer, methacryl Examples include methyl acid-butadiene-styrene copolymer, and in the case of copolymerization, it is necessary to polymerize and contain methyl methacrylate in an amount of 50% by weight or more, and preferably 70% by weight or more.

These methacrylic polymers generally have an intrinsic viscosity in the range of 03 to 2o in chloroform at 25°C.

Further, these methacrylic polymers are synthesized by known methods using a radical polymerization initiator and conventional polymerization methods such as solution polymerization, suspension polymerization, emulsion polymerization, bulk polymerization, etc.

Next, in the olefin copolymer comprising an α-olefin and a glycidyl ester of an α,β-unsaturated acid used in the present invention, α-olefins include ethylene, propylene, butene-1, etc., and ethylene is preferably used. Glycidyl esters of α,β-unsaturated acids are compounds represented by the general formula ROQ (wherein R is a hydrogen atom or a lower alkyl group), and specifically, glycidyl acrylate, methacrylic acid These include glycidyl, glycidyl ethacrylate, and glycidyl methacrylate is preferably used. The amount of copolymerized glycidyl ester of α,β-unsaturated acid is suitably in the range of 1 to 50% by weight.

Preferred examples of the olefin copolymer in the present invention include ethylene/glycidyl methacrylate copolymer, propylene/glycidyl methacrylate copolymer, ethylene/glycidyl acrylate copolymer, and ethylene/glycidyl methacrylate copolymer. Polymers are most preferably used.

The amount of the olefin copolymer added is 1 to 100 parts by weight, preferably 3 to 50 parts by weight, per 100 parts by weight of the methacrylic polymer. . If the amount added is less than 1 part by weight, the improvement in solvent resistance and impact resistance will not be sufficient, and if it is more than 100 parts by weight, the mechanical properties will tend to be impaired, so neither is preferable.

In addition, compared to the composition of the present invention, triphenylamine, 2
．． 4.6-) Tertiary amines such as lith(dimethylaminomethyl)phenol, phosphite esters such as triphenylphosphite and triisodecylphosphite, phosphonium compounds such as triallylphosphonium bromide, and tertiary amines such as triphenylphosphine. The impact resistance can be further improved by adding sulfonic acid metal salts such as grade phosphine, sodium dodecylbenzenesulfonate, and sodium 3,5-dicarbomethoxybenzenesulfonate, and sulfuric acid ester salts such as sodium lauryl sulfate. The amount of these salts added is preferably 0.001 to 5 parts by weight per 100 parts by weight of the methacrylic polymer.

The composition of the present invention may contain antioxidants, heat stabilizers, ultraviolet absorbers, colorants, mold release agents, lubricants, flame retardants, antistatic agents, glass fibers, etc., to the extent that the objects of the present invention are not impaired. One or more conventional additives, such as reinforcing agents, can be added.

The method for producing the composition of the present invention is not particularly limited, but preferably includes a method in which a methacrylic copolymer and an olefin copolymer are melted and mixed in an extruder and then cut into pellets.

The methacrylic resin composition of the present invention can be easily molded by conventional methods such as injection molding and extrusion molding, and the resulting molded product exhibits excellent performance.

Hereinafter, the effects of the present invention will be explained in detail with reference to Examples.

Example: Methyl methacrylate-methyl acrylate copolymer having an intrinsic viscosity of 051 in chloroform at 25°C obtained by suspension polymerization (weight ratio 87/13) 1 ao parts by weight are shown in Table 1. 15 parts by weight of the olefin copolymer obtained above were melt-mixed using a screw extruder set at 170°C to obtain pellets.

Next, this pellet was molded using a screw in-line injection molding machine to obtain an ASTM bending test piece with a thickness of % inch and two types of Izot impact test pieces with a thickness of % inch and % inch. Measurements were made for each test piece, and the physical properties shown in Table 1 were obtained.

Furthermore, a bending test was conducted after immersion in carbon tetrachloride for 24 hours.

In addition, for comparison, the physical properties of a sample to which no olefin copolymer was added were determined in the same manner.

These results are shown in Table 1.

As is clear from the results in Table 1, it can be seen that the methacrylic resin composition of the present invention has greatly improved solvent resistance and impact resistance.

Procedural amendment (method) 88°
^, 3. 1B Commissioner of the Japan Patent Office Kazuo Wakasugi 1. Indication of the case Patent Application No. 468749 of 1981 2. Name of the invention Methacrylic resin composition 6. Person making the amendment 4. Date of the amendment order February 22, 1988 ( Shipping date) 5 Number of inventions increased by amendment 0

Claims (1)

[Claims] α-olefin and α, based on 100 parts by weight of a methacrylic polymer containing 50% by weight or more of methyl methacrylate.
A methacrylic resin composition containing 1 to 100 parts by weight of an olefin copolymer comprising gly/dyle ester of a β-unsaturated acid.