JPS5942024B2 - thermoplastic resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin composition with excellent transparency and moldability. By mixing a polymer resin, a resin composition that maintains the excellent transparency inherent to polycarbonate and has excellent moldability is provided.

Traditionally, polycarbonate is known for its transparency and impact resistance (-,
It has extremely excellent properties and is widely used in fields that require the above properties, but one drawback is that it requires a high molding temperature during the molding process, and there is no effort to improve this point. Various laws have been reported.

For example, AS resin (Special Publication No. 43-13384), AB
A method of mixing S resin (Japanese Patent Publication No. 38-1522, No. 5), etc. is already known, and it is recognized that both of them mix relatively uniformly with polycarbonate and that moldability is significantly improved. The inherent transparency of polycarbonate is completely lost, and its range of use as an opaque resin is greatly limited.

On the other hand, a method of mixing polycarbonate with polystyrene, which has a similar refractive index, for the purpose of maintaining a transparent envelope has already been reported (Japanese Patent Publication No. 43-6295), but the method of mixing polystyrene with polystyrene is also shown in the above cited reference. As mentioned above, as the amount of polystyrene mixed increases, the transparency of the molded product gradually decreases, and when the amount added exceeds 20%, the haze value increases, and it is practically impossible to use as a transparent resin. It becomes something impossible. Moreover, properties such as the softening temperature, mechanical strength, impact strength, and melt viscosity of the mixture change greatly when the amount of polystyrene is between 20 and 40 (Ff). In order to obtain a molded product, it is limited to 20% or less.

The present inventors have arrived at the present invention as a result of extensive studies aimed at obtaining a resin composition with good moldability while maintaining the excellent transparency of polycarbonate from the above viewpoint.

That is, the present invention is a resin polymer A4O containing 80% by weight or more of 4,4'-dioxydilylalkane polycarbonate to 99% by weight.
and 60 to 98 parts by weight of an aromatic vinyl monomer, at least one acrylic acid or methacrylic acid ester derivative represented by the general formula, a polyfunctional monomer copolymerizable with these, and at least one allyl Monomers with groups
Copolymer B obtained by polymerizing 0 to 1 part by weight of a mixture with moldability and transparency consisting of 1 to 60% by weight F! It is a polycarbonate resin composition with excellent +.

In the present invention, the oiso can be used in the range of 1 to 60% by weight of the vinyl copolymer resin B to the resin polymer A4O to 99% by weight, which is mainly composed of polycarbonate, but preferably A5O to 95% by weight. In contrast, B is in the range of 5 to 50% by weight.

Within the above usage range, 60 to 98 parts by weight of the aromatic vinyl monomer of the present invention and 2 to 40 parts by weight of at least one of the aromatic esters of methacrylic acid and the acrylic acid described in the claims. It is obtained by copolymerizing a monomer mixture consisting of a polyfunctional monomer and a monomer having at least one allyl group.

When mixed with polymer resin, surprisingly, it has much better transparency than when mixed with styrene, does not cause a decrease in transparency even when added in high amounts, and is easy to mold and process. A resin composition with very good properties can be obtained. The reason for producing the effects of the present invention is that the copolymer BCT]VC,
Because the aromatic acrylate or aromatic methacrylate component is copolymerized with a relatively high refractive index as a homopolymer, the refractive index is closer to that of polycarbonate than that of polystyrene. This is thought to be due to improved solubility.

The reason why the amount of vinyl copolymer B mixed is limited to 1 to 60% by weight is because if it is less than 1%, the transparency, which is one of the characteristics of the present invention, will be the same as that of polycarbonate, but the moldability will be lowered. This is because the effect is difficult to express, and 60% by weight
This is because the amount of polycarbonate phase decreases, and the effect of modifying the polycarbonate is weakened, resulting in a significant decrease in physical properties such as mechanical strength, impact resistance, and softening temperature.

The resin polymer A used in the present invention is 80% by weight of 4,4'dioxydiarylalkane polycarbonate.
It is a polymer or a polymer mixture containing the above, and a typical one among the polymer carbonates is 2,2/1 (4,
It is a carbonate of 4'-dihydroxydiphenyl)-propane, and its production methods include the phosgene method, which involves blowing phosgene into the presence of an aqueous caustic alkali solution and a solvent, and the phosgene method, in which 4,4'-dioxydiarylpropane and diester carbonate are produced. There is a transesterification method in which transesterification is performed in the presence of a catalyst. Polymers that can be mixed with the polycarbonate include polystyrene, styrene-α-methylstyrene copolymer, styrene-acrylonitrile copolymer, etc., and these should be added to the extent that they do not impair the transparency of the polycarbonate. Yes, the amount added is 20
It is preferably less than % by weight. In preparing the resin polymer B used in the production of the composition of the present invention, examples of the aromatic vinyl monomer used include styrene and α-methylstyrene, with styrene being particularly preferred.

The aromatic acrylic ester or methacrylic ester is represented by the general formula, where X is hydrogen or a methyl group, and Y is benzine, p-phenylbenzyl, α-methylbenzyl, diphenylmethyl, α ，
α-dimethylbe]nozyl, 1,1-diphenylethyl,
These are compounds represented by trityl and naphthyl groups, and it is also possible to use two or more of these in combination.

The amounts of the polyfunctional juice monomer and the monomer having at least one allyl group used are 0 to 3 parts by weight and 0 to 1 part by weight, respectively, and both transparency and moldability are good even without addition. Although there may be cases, preferably 0.05 to 3 times the age, 0.
Excellent results can be obtained when the amount is added in the range of 0.01 to 1 part by weight.

Types of polyfunctional monomers include polyvinylbenzenes such as divinylbenzene and trivinylbenzene, alkylene glycol dimethacrylates such as ethylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, and ethylene glycol diacrylate;
Alkylene glycol diacrylates such as 1,3-butylene glycol diacrylate can be used, with divinylbenzene and 1,3-butylene dimethacrylate being particularly preferred.

Examples of monomers having at least one allyl group include allyl, methallyl, and crotyl esters of copolymerizable α,β monounsaturated monocarboxylic acids or dicarboxylic acids, such as allyl acrylate, allyl methacrylate, etc. be.

In addition, triallyl cyanurate and triallyl isocyanurate are also effective. When carrying out the present invention, methods for mixing each component include, for example, adding one polymer in a molten state to the other polymer in the form of pellets or in a molten state and mixing uniformly, or mixing both in pellets. It is also possible to mix the powdered material, or the powdered material and the pelleted material in advance, and then melt and mix them in a mixer.

The resin composition according to the present invention may, if necessary, contain known lubricants and stabilizers to the extent that they do not harm the physical properties of the product.

The present invention will be specifically described below with reference to Examples.

Examples 1 to 8 t-Butyl hydroperoxide (T
BH) 1 part was dissolved.

Next, 1.0 part of allyl methacrylate and 0.2 part of divinylbenzene were added, and further, 0.2 part of n-octyl mercaptan was added as a molecular weight regulator.

This solution was mixed with 1.0 part of fatty acid potassium soap (Nonsal TK-1 manufactured by Nissan Yushi) as an emulsifier and sodium formaldehyde sulfoxylate (S) as a redox initiator.
FS), 0.0005 parts of ferrous sulfate, and 0.0015 parts of ethylenediaminetetraacetic acid sodium salt dissolved in 200 parts of ion-exchanged water are added to a solution and reacted at 600C for 2 hours.

Sulfuric acid was added to the obtained polymer emulsion in an amount of 3% based on the total amount of the polymer, and the emulsion was coagulated and solidified, followed by filtering, washing with water, and drying to produce a resin polymer B. Resin polymer B thus obtained was mixed with resin polymer A whose main component was polycarbonate (Novarex 7025P manufactured by Mitsubishi Kasei) in the proportions shown in Table 1, and kneaded in a 25φ vent extruder to produce pellets. Next, test pieces were molded using a screw injection molding machine, and the resin properties of each were measured, and the results shown in Table 1 were obtained.

In addition, as comparative examples, in the case of polycarbonate alone, in the case of mixing 70 parts of the resin polymer B, and in the case of polystyrene 2
Physical properties are also shown for the case where 0 parts were mixed.

Examples 9 to 16 In the above examples, resin polymer B was prepared in exactly the same manner as in Examples 1 to 8, except that the composition of resin polymer (8) was as shown in Table 2.

Table 2 shows the physical properties of a resin composition obtained by mixing 40 parts of this resin polymer B and 60 parts of polycarbonate.

As comparative examples, a case where polystyrene produced in the same manner as resin polymer B was mixed, a case where a resin polymer containing 55 parts of pendyl acrylate was mixed, and a case where a polyfunctional monomer and one or more allyl groups were mixed. 5.
The case where 0.3.0 parts were added is also shown.

Claims (1)

[Claims] 1. Resin polymer A40-99 containing 80% by weight or more of 4,4'-dioxydiarylalkane polycarbonate
Weight% and aromatic vinyl monomer 60-98 parts by weight General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (X = H, CH_3 Y = ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼, ▲ Mathematical formulas, chemical formulas, etc. , tables, etc. ▼▲ There are mathematical formulas, chemical formulas, tables, etc. ▼, ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼▲ There are mathematical formulas, chemical formulas, tables, etc. ▼▲ There are mathematical formulas, chemical formulas, tables, etc. ▼
▲There are mathematical formulas, chemical formulas, tables, etc.▼, ▲Mathematical formulas, chemical formulas,
At least one kind of acrylic acid or methacrylic acid ester derivatives shown in ▼)
Part by weight 0 to 3 parts by weight of a polyfunctional monomer copolymerizable with these and 0 to 3 parts by weight of a monomer having at least one allyl group
Copolymers B1 to 6 obtained by polymerizing 1 part by weight of the mixture
A polycarbonate resin composition with excellent moldability and transparency consisting of 0% by weight.