JPS61183353A - Resin composition - Google Patents

Abstract

PURPOSE:To provide a resin compsn. which is less notch-dependent and has excellent resistance to impact and heat distortion, by blending an olefin copoly mer with a resin compsn, by blending an olefin copolymer with a resin compsn. consisting of a polyarylate and a polyamide. CONSTITUTION:A resin compsn. (A) is obtd, from 1-70wt% polyarylate (a) obtd. from a bisphenol such as bisphenol A and terephthalic and/or isopthalic acid or its functional derivative (e.g. acid dichloride) and 99-30wt% polyamide (b) (e.g. polycaprolactam). 50-99.5wt% component A is mixed with 50-0.5wt% olefin copolymer (B) (e.g. ethylene/glycidyl methacrylate copolymer) composed of an alpha-olefin and glycidyl ester of an alpha, beta-unsaturated acid of the formula (wherein R4 is H, lower alkyl). The mixture is melt-kneaded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a resin composition having excellent impact properties.

(Prior Art) A resin composition comprising a polyarylate and a polyamide is already known from Japanese Patent Application Laid-Open No. 52-98765. The heat distortion temperature of such a resin composition is 140 to 1 under heavy load.
50°C, other engineering plastics such as polyacecool at 110°C, modified aromatic polyether at 90-130°C, polyamide at 60°C, polybutylene terephthalate at 50°C, and polycarbonate at 135°C.
This is a significantly high value compared to other countries. In order to improve the heat distortion temperature of polyamide and polybutylene terephthalate, it is common practice to fill them with an inorganic filler such as glass fiber.

However, in this case, warpage and anisotropy in physical properties are likely to occur in the resulting molded product (problems such as wear of the molding machine and mold are also likely to occur).On the other hand, in the case of a resin composition made of polyarylate and polyamide, Since the heat distortion temperature is originally high, there is no need for inorganic filler filling, and there are fewer traps like this.

Further, while modified aromatic polyethers and polycarbonates have insufficient chemical resistance, the resin composition has excellent chemical resistance. As described above, resin compositions made of polyarylate and polyamide have unique properties not found in other engineering plastics, and are already in widespread practical use.

However, although the impact resistance of the resin composition is comparable to that of general engineering plastics, it has the drawback of being extremely low under certain conditions. In other words, a notch provided in a molded product
If the diameter of the tip is large, it has high impact strength, but if it is small, the impact strength is significantly low. There has been a strong demand for a resin composition that improves the notch dependence of impact strength and has high impact strength even when sharp notches are formed.

(Problems to be Solved by the Invention) As a result of intensive research in view of the above situation, the present inventors found that α
- By blending an olefin copolymer consisting of an olefin and a glycidyl ester of an α,β-unsaturated acid,
Surprisingly, the inventors have discovered that it is possible to obtain a resin composition having excellent impact properties while maintaining the properties of the resin composition, and have arrived at the present invention.

(Means for Solving the Problems) The present invention provides (2) a resin composition comprising 1 to 70% by weight of polyarylate and 99 to 30% by weight of polyamide.
9.5% by weight of (Bl) and 50 to 0.5% by weight of an olefinic copolymer consisting of a glycidyl ester of an α-olefin and an α,β-unsaturated acid.

(Function) The polyarylate used in the resin composition of the present invention is obtained from bisphenols and terephthalic acid, isophthalic acid, a mixture thereof, or a functional derivative thereof. Examples of such bisphenols include 4,
4”-dihydroxy-diphenyl ether, bis(4-
Hydroxy-2-methylphenyl)-ether, bis(
4-hydroxyphenyl)-sulfide, bis(4-
hydroxyphenyl)-sulfone, bis(4-hydroxyphenyl)-ketone, bis(4-hydroxyphenyl)-methane, bis(4-hydroxy-3-methylphenyl)-methane, 1,1-bis(4-hydroxyphenyl) )-ethane, 2,2-bis(4-heroxy3-methylphenyl)propane.

1.1-bis(4-hydroxyphenyl)n-butane,
Bis(4-hydroxyphenyl)-phenylmethane, bis(4-hydroxyphenyl)-diphenylmethane, bis(4-hydroxyphenyl)-4°-methylphenylmethane, 1.1-bis(4-hydroxyphenyl)-cyclohexane, Examples include bis(4-hydroxyphenyl)-cyclohexylmethane and 2,2-bis(4-hydroxynaphthyl)-propane, but the most commonly produced and representative one is 2,2-bis(4-hydroxyphenyl). -Propane, also known as bisphenol A. If necessary, mixtures of the bisphenols or bisphenols and small amounts of other divalent compounds such as 2,2'-dihydroxydiphenyl, 2,6-
Mixtures of dihydroxynaphthalenes such as dihydroxynaphthalene, hydroquinone, resorcinol, 2,6-dihydroxytoluene, 3.6-dihydroxytoluene, etc. can be used. Functional derivatives of terephthalic acid or isophthalic acid are dichlorides or diesters of alkyl, esters, etc. of these acids.

The phenylene group of the terephthalic acid or isophthalic acid or functional derivative thereof used in the present invention may be substituted with an alkyl group.

The polyarylate used in the present invention can be synthesized by any method such as an interfacial polymerization method, a solution polymerization method, or a melt polymerization method. The polyamide used in the resin composition of the present invention is represented by the general formula (I) +C-R+-N+ (I) or [■]. Here, R+, lh and R2 represent an alkylene group. The polyamide used in the present invention includes a polymer formed by a condensation reaction of a diamine and a dibasic acid, a self-condensation reaction of an amino acid, and a polymerization reaction of a lactam.

The polyamide used in the present invention may be any polyamide represented by the above general formula, but preferred polyamides include polyhexamethylene adipamide, polycaprolactam, polyhexamethylene sebamide, and polydecamethylene adipamide. , polymethaxylylene adipamide, polytetramethylene adipamide, and the like.

The α-olefin used in the resin composition of the present invention and α,
The α-olefin in the olefin copolymer made of glycidyl ester of β-unsaturated acid is ethylene, propylene, butene-1, etc., and ethylene is more preferable.

Further, the glycidyl ester of an α,β-unsaturated acid is a compound represented by the general formula (I[I). Here, R4 represents a hydrogen atom or a lower alkyl group. Specifically, glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate, etc., with glycidyl methacrylate being more preferred. The amount of copolymerized glycidyl ester of α,β-unsaturated acid is suitably in the range of 1 to 50 mol%. 4 more
An unsaturated monomer that can be copolymerized with the above copolymer if the amount is 0 mol% or less.

Namely, vinyl ethers, vinyl esters such as vinyl acetate and vinyl propionate, esters of acrylic acid and methacrylic acid such as methyl, ethyl, and propyl, acrylonitrile, and styrene.

- One or more types of carbon oxide etc. may be copolymerized.

These olefin copolymers are polyarylates 1 to 70
The amount added to a resin composition (hereinafter referred to as PAR/PA resin composition) consisting of 99 to 30% by weight of polyamide is PAR based on the total amount of the PAR/P^ resin composition and the olefin copolymer. / PA resin composition 50-99.
5% by weight, 50-0.5% by weight of the olefinic copolymer is appropriate, and when the PAR/PA resin composition is more than 99.5% by weight and the olefinic copolymer is less than 0.5% by weight. The effect of improving the desired impact strength is insufficient, and the PAR/PA resin composition is less than 50% by weight,
If the olefin copolymer content exceeds 50% by weight, P
The reduction in heat deformation resistance, which is a characteristic of AR/P^ resin compositions, is extremely undesirable.

The means of blending the composition of the present invention is not particularly limited.

It is possible to feed the olefin copolymer and the PAR/PA resin composition separately to a melt mixer, and also to mix these raw materials in advance in a mortar, a Henschel mixer,
It is also possible to pre-mix using a ball mill, ribbon blender, etc. and then supply it to a melt mixer.

Additionally, antioxidants and heat stabilizers may be added to the resin composition of the present invention within a range that does not impair the purpose of the present invention.

UV absorbers, lubricants, mold release agents, colorants such as dyes and pigments,
*It is possible to add one or more conventional additives such as flame retardants, flame retardant aids, antistatic agents, etc. There are also small amounts of other thermoplastic resins (e.g. polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate,
polyethylene oxybenzoate, polysulfone, polycarbonate) or glass fiber, carbon fiber, boron fiber.

Reinforcing agents such as silicon carbide fibers, asbestos fibers, and metal fibers, fillers such as clay, mica, silica, GraphAct glass beads, alumina, calcium carbonate, magnesium hydroxide, and hydrotalcites are also used in appropriate amounts depending on the purpose. It is also possible to mix.

(Example) The present invention will be described below with reference to Examples, but the present invention is not limited thereto.

Examples 1-4. Comparative Examples 1 to 4 Polyarylate obtained from a 1:1 (molar ratio) mixture of terephthalic acid and isophthalic acid and bisphenol (phenol/tetrachloroethane = 6/4 (weight ratio), 25°C, Ig/dl logarithmic viscosity 0.65), polycaprolactam (also logarithmic viscosity 1.0), and ethylene glycidyl methacrylate copolymer (manufactured by Sumima Kagaku Kogyo, Bondfurth) H) were mixed in the composition shown in Table 1. , melt-mixed at 260°C using a twin-screw extruder (Ikegai Iron Works i!!PcM-30).

Got a beret.

The obtained pellets were injection molded at 270°C to prepare Izot impact test pieces (12.7 x 64 x 6.4 mm) and heat distortion temperature measurement test pieces (12.7 x 127 x 6.4 mm).
mm) was obtained.

Further, notches were formed in the Izot impact test specimens by cutting using notch blades having various tip diameters.

Izotsu impact test and heat distortion temperature measurement are performed by AST respectively.
Compliant with MD-256, D-648.

(Effects of the Invention) As is clear from Table 1, the resin composition of the present invention has low notch dependence, and it is clear that it has both extremely excellent impact properties and heat deformation resistance, making it an industrially extremely excellent resin. It is.

Claims (1)

[Claims] (1) (A) 50 to 99.5% resin composition consisting of 1 to 70% by weight of polyarylate and 99 to 30% by weight of polyamide
Weight% and (B) Olefin copolymer 5 consisting of α-olefin and glycidyl ester of α,β-unsaturated acid
A resin composition comprising 0 to 0.5% by weight.