JPS6151048A - Methacrylate resin composition having excellent antistatic performance - Google Patents

Abstract

PURPOSE:To obtain a resin compsn. having greatly improved water resistance and durability of antistatic performance, by blending a glycerol monofatty acid ester and an epoxy group-contg. vinyl polymer with a methacrylate resin in a specified ratio. CONSTITUTION:A resin compsn. comprising 70-99.4wt% methacrylate resin, 0.3-15wt% glycerol monofatty acid ester and an epoxy group-contg. vinyl polymer, wherein the quantity of an epoxy group-contg. monomer component in the resin compsn. is 0.05-15wt%. The epoxy group-contg. vinyl polymer is effective in imparting water resistance and durable antistatic performance to the glycerol monofatty acid ester. Examples of the vinyl polymers are polymers contg. at least 5wt% monomer component selected from glycidyl (meth)acrylate and beta- methylglycidyl (meth)acrylate.

Description

Detailed Description of the Invention CI] Industrial Application Field The present invention relates to a methacrylic resin composition having excellent antistatic properties. More specifically, the present invention relates to a methacrylic resin composition that has significantly improved antistatic properties, durability, and water resistance.

Methacrylic resin is widely used in lighting equipment, signboards, decorative items, etc. due to its excellent transparency, good mechanical properties, processability, and beautiful appearance of molded products. However, methacrylic resin has a very high surface resistivity, making it difficult for static electricity induced by contact, friction, etc. to dissipate or disappear, and has the disadvantage that dust, etc. can easily accumulate on the resin surface during use, damaging its beautiful appearance. ing.

The present invention improves the above drawbacks and provides a methacrylic resin composition that can be widely used in such fields.

[π] Conventional techniques and problems Conventionally, as a method to eliminate such static electricity damage, a method of kneading higher fatty acid monoglyceride and polyalkylene glycol (Japanese Unexamined Patent Publication No. 121850/1982), a method of copolymerizing methacrylic acid and methyl methacrylate, etc. Method of kneading glycerin monofatty acid ester into the mixture (JP-A-58-11)
3852), a method of incorporating a glycerin monofatty acid nistert-mediated compound into methacrylic resin (Japanese Patent Application Laid-open No. 1983-
Publication No. 98745)! 8 is being held. Other methacrylic resin, glycerin monofatty acid ester and phosphorus compound,
Method of adding polyalkylene glycol (Machishima Sho 51
-49246 publication), a method of adding glycerin monofatty acid ester twice before and after polymerization during methacrylic resin production (Japanese Patent Application Laid-open No. 112949/1983), glycerin monofatty acid ester and boric acid to methacrylic resin. A method of adding an ester (Japanese Unexamined Patent Publication No. 52-102862) is described.

However, all of these methods have antistatic properties in the initial stage immediately after molding, but their durability and water resistance are extremely poor, and when they come into contact with water, the antistatic properties disappear immediately, and the performance deteriorates over time after molding. It has the disadvantage of being

Cm] Purpose of the Invention The present invention eliminates the above-mentioned conventional problems,
The purpose of the present invention is to provide a composition that dramatically improves the durability and water resistance of the antistatic performance of methacrylic resin.

CM] Groove formation of the invention The present invention provides a resin composition comprising 70 to 99.4% by weight of a methacrylic resin, 0.8 to 15% by weight of a glycerin monofatty ester, and a vinyl polymer containing an epoxy group. The present invention relates to the production of a methacrylic resin having excellent antistatic performance, characterized in that the epoxy group-containing monomer component in the resin composition is 0.05 to 15% by weight.

The methacrylic resin of the present invention is a methyl methacrylate homopolymer, or 80% by weight or more of methyl methacrylate and an acrylic ester or a methacrylic ester,
A copolymer with acrylic acid, methacrylic acid, styrene, acrylonitrile, etc. As the acrylic ester, methyl acrylate, ethyl acrylate, butyl acrylate, etc. can be used, and as the methacrylic ester, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, etc. can be used.

The glycerin monofatty acid esters used in the present invention include glycerin monoesters of higher fatty acids having 8 to 22 carbon atoms, such as lauric acid monoglyceride, myristic acid monoglyceride, palmitic acid monoglyceride, oleic acid monoglyceride, stearic acid monoglyceride, and montanic acid. Monoglyceride, linoleic acid monoglyceride, behenic acid monoglyceride,
is given as a preferable example. These can be used alone or in combination of two or more, if necessary. The addition tray of higher fatty acid monoglyceride is 0.3 to 15% by weight,
It is preferably used in an amount of 1 to 10% by weight. Addition capacity is 0.3
When the weight is less than 8%, the antistatic performance of the methacrylic resin can hardly be expected. Furthermore, if more than 15 compound compounds are added, the cost will be high, the methacrylic resin will become cloudy and the transparency will decrease, which is undesirable, and the physical properties such as heat resistance will noticeably deteriorate, which is undesirable.

The epoxy group-containing vinyl polymer of the present invention is a glycerin monofatty acid ester? tF [durability in prevention performance,
This is an effective method for providing water resistance. Examples of the vinyl polymer or copolymer containing an epoxy group include a homopolymer of at least one single R component among glycidyl acrylate, glycidyl methacrylate, β-methylglycidyl acrylate, and β-methylglycidyl methacrylate; Alternatively, it is a copolymer of at least 5% by weight of these polymers and other copolymerizable vinyl monomers. Other copolymerizable vinyl monomers include methyl (meth)acrylate (representing methyl acrylate and methyl methacrylate), ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and lauryl (meth)acrylate. ) acrylate, cyclohexyl (meth)acrylate, ethyl cellosolve (meth)acrylate, benzyl (meth)acrylate, β- and droxyethyl (
meth)acrylate, β-hydroxypropyl(meth)
Examples include acrylate, (meth)acrylic acid, styrene, vinyltoluene, acrylonitrile, acrylamide, fumaric acid, maleic acid, itaconic acid, and alkyl esters thereof.

The amount of the epoxy group-containing vinyl polymer or copolymer in the resin composition is 0.0.
5-153ifi4% (preferably 0.1-7% heavy meals)
(It takes a considerable amount.

If the amount of the epoxy group-containing single-layer component is less than 0.05% by weight, the durability and water resistance of the anti-discoloration performance can hardly be expected, and if it is added in excess of 15%, the transparency of the acrylic resin will decrease. Undesirable.

The composition of the present invention includes methacrylic resin, glycerin, and (7) fat u.
It is obtained by melting and kneading a vinyl polymer containing a lj acid ester and an epoxy group by extrusion or the like. Another method for producing methacrylic resin is to add part or all of a glycerin monofatty acid ester or epoxy group-containing vinyl polymer during the polymerization of raw material monomers. can.

Pigments, inorganic fillers, and organic fillers can also be blended into the composition of the thin ice invention.

(Vl Examples Examples 1 to 5 Comparative Examples 1 to 8 Methyl methacrylate 5001.n-butyl methacrylate 6001, glycidyl methacrylate 800 g, azobisisobutyronitrile 401 and di-butyl peroxide 201 were preheated to 120"C. 2 of xylene was added dropwise over a period of 4 hours. After the dropwise addition was completed, the reaction was further carried out at 125°C for 5 hours, and
Distill the bath agent under reduced pressure to obtain glycidyl methacrylate (glycidyl methacrylate) 40
A copolymer containing 1% mff was obtained. This copolymer is referred to as Polymer A.

Ido (manufactured by Sanken Vitamin ■, Rikemar ■ S 100A)
were mixed in the proportions shown in Table 1, pelletized at 250"C using a 40Ω extruder, and then the surface resistivity and half-life were measured, and the results are shown in Table 1. After measurement, the plate was washed 6'I in water at 30'C 2B-C
, surface resistivity and λiu i+;

The surface resistivity value was determined using a ultra-super insulation meter SM-IQ type (Toa Denpa Kogyo ■), and the half-life was measured using a static honest meter (■ Sagetsu Shokai fR).

In Comparative Example 1.2, fs had antistatic performance before washing with water, but completely disappeared after washing with water. In Comparative Example 3, cloudiness was observed in the cast molded body.

Examples 5 to 7, Comparative Example 4 β-methylglycidyl acrylate 200f1 Methyl methacrylate 400f, lauryl mercaptan 241
1, lauroyl peroxide and 2,4 chloride were mixed and subjected to bulk polymerization for 4 hours at 70''C under a nitrogen atmosphere to obtain a 200% F-polymer copolymer B. B contained 38% of β-methylglycidyl acrylate. It included 3 double base%.

B was crushed using a crusher, and the same methacrylic resin as in Example 1 was mixed with behenic acid monoglyceride.The same procedure as in Example 1 was carried out to obtain a 50 x 50 x B tin flat plate. Obi f [
l! /J stopping performance Measured in the same manner as performance example 1 and the results as shown in the second example.
Shown in the table.

[M] Effects The methacrylic resin composition obtained according to the present invention has a low surface resistivity value and a short charge decay half-life, and this performance is maintained over a long period of time and does not deteriorate even when washed with water.

Since the composition of the present invention has such advantages, it exhibits remarkable effects on lighting equipment, electric meters, covers and parts of electronic devices, meter covers, daily necessities, film sheets, panels, etc.

Claims (1)

[Scope of Claims] 1) A resin composition comprising 70 to 99.4% by weight of methacrylic resin, 0.3 to 15% by weight of glycerin monofatty acid ester, and a vinyl polymer containing an epoxy group. The epoxy group-containing monomer component inside is 0.
A methacrylic resin composition with excellent antistatic performance, characterized in that the content is 05 to 15% by weight. (2) The vinyl polymer containing an epoxy group contains at least 5% by weight of at least one monomer component selected from the group consisting of glycidyl acrylate, glycidyl methacrylate, β-methylglycidyl acrylate, and β-methylglycidyl methacrylate. The methacrylic resin composition according to claim 1, which is a polymer comprising: