JPH05171040A - Resin composition containing liquid crystal polyester - Google Patents

Abstract

PURPOSE:To obtain a resin compsn. lowered in melt viscosity and hence improved in moldability by blending a polyetherimide resin with a thermotropic liquid crystal polyester and a polycarbonate resin. CONSTITUTION:The title compsn, comprises (A) 60-99 pts.wt. polyether-imide resin, (B) 1-40 pts.wt. thermotropic liquid crystal polyester, and (C) a polycarbonate resin, the amt. of which is 3-50 pts.wt. per 100 pts.wt. sum of (A) and (B). Conventionall methods are satisfactorily used in the preparation of this resin compsn., but the melt milling method is generally preferable. This resin compsn. is a polyether-imide resin compsn. improved in melt viscosity without lowering of mechanical properties and without delamination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyetherimide (hereinafter PE) containing a thermotropic liquid crystal polyester.
I)) based resin composition, and more specifically, to a resin composition containing a PEI based resin, a thermotropic liquid crystal polyester and a polycarbonate based resin.

[0002]

2. Description of the Related Art Polyetherimide has excellent flame resistance,
Since it has mechanical strength and heat resistance, it is used in various applications as a high-performance thermoplastic molding material. But,
The polyetherimide used has poor processability because it exhibits a high viscosity when melted, and requires a high processing temperature to reduce the viscosity. To avoid this problem, a polyetherimide having a low polymerization degree is used. However, chemical resistance, mechanical strength, etc. are impaired, and a molded product having satisfactory physical properties cannot be obtained.

It has been proposed to add a small amount of a compound such as a metal soap or a fatty acid amide in order to improve workability (JP-A-1-139645). However, this method is not sufficient because a small amount is not effective and silver streak is likely to occur depending on the processing temperature.

It is also known to compound a liquid crystal polymer (Japanese Patent Laid-Open No. 63-215769). However, although the apparent viscosity is lowered, the compatibility between the liquid crystal polymer and the polyetherimide is poor, and the molded product exhibits layered peeling,
Not suitable for practical use.

[0005]

The object of the present invention is therefore to solve the problem of processability due to the high melt viscosity of polyetherimide.

[0006]

Means for Solving the Problems As a result of intensive studies on the improvement of the melt flowability of polyetherimide, the inventors of the present invention have found that a blend of a polyetherimide resin and a thermotropic liquid crystal polyester further contains a polycarbonate resin. Since the resin composition obtained by blending has good dispersibility between resins, it was found that the melt viscosity is lowered and the moldability is improved, and the present invention has been accomplished.

That is, the present invention comprises (A) 60 to 99 parts by weight of a polyetherimide resin and (B) 1 to 40 parts by weight of a thermotropic liquid crystal polyester, and further 100 parts by weight of (A) and (B) in total. On the other hand, a resin composition containing 3 to 50 parts by weight of (C) a polycarbonate-based resin is provided.

The (A) PEI resin used in the present invention is
The following formula (Formula 1):

[0009]

[Chemical 1] (In the formula, R ¹ is a divalent aromatic organic group having 6 to 30 carbon atoms, R ² is a divalent aromatic organic group having 6 to 30 carbon atoms,
A polymer having a repeating unit represented by an alkylene group having 2 to 20 carbon atoms, a cycloalkylene group, or a polyorganosiloxane group chain-terminated with an alkylene group having 2 to 8 carbon atoms).

Here, as R ¹ , specifically, the following formula (Formula 2):

[0011]

[Chemical 2] The group of the group shown by is mentioned.

A particularly typical polyetherimide resin is represented by the following formula (Formula 3):

[0013]

[Chemical 3] , Which is commercially available under the trade name of "ULTEM" from General Electric Company.

Next, the thermotropic liquid crystal polyester (B) can be selected from the group of polyesters containing a segment having the following structure.

--OR--O-- --CO--R--CO-- --ORR--CO-- Here, each R can be selected from the group of the following (Chemical Formula 4).

[0016]

[Chemical 4] Further, the aromatic ring, aliphatic group, alicyclic group and the like in R may be substituted with a substituent selected from the group of the following (Chemical Formula 5).

[0017]

[Chemical 5] The component (B) is blended in an amount of 1 to 40 parts by weight, preferably 70 to 97 parts by weight of the component (A), in an amount of 3 to 30 parts by weight. Ingredient (B) is 1
If it is less than part by weight, the effect of improving melt fluidity is small,
If the amount is more than 40 parts by weight, delamination is likely to occur.

The (C) polycarbonate resin used in the present invention is an aromatic polycarbonate produced by a known phosgene method or a melting method (for example, JP-A-63-2).
15763 and JP-A-2-124934). The polycarbonate resin is composed of a carbonate component and a diphenol component. Examples of the precursor for introducing the carbonate component include phosgene and diphenyl carbonate. Suitable diphenols include, for example, 2,2-bis (4-hydroxyphenyl) propane (so-called bisphenol A); 2,2-bis (3,5-
Dibromo-4-hydroxyphenyl) propane; 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane; 1,
1-bis (4-hydroxyphenyl) cyclohexane; 1,1-
Bis (3,5-dimethyl-4-hydroxyphenyl) cyclohexane; 1,1-bis (4-hydroxyphenyl) decane; 1,
4-bis (4-hydroxyphenyl) propane; 1,1-bis (4-hydroxyphenyl) cyclododecane; 1,1-bis (3,5-dimethyl-4-hydroxyphenyl) cyclododecane; 4,4-dihydroxy And diphenyl ether; 4,4-thiodiphenol; 4,4-dihydroxy-3,3-dichlorodiphenyl ether; and 4,4-dihydroxy-2,5-dihydroxydiphenyl ether. These can be used alone or in combination. In addition to this,
It is also possible to use compounds having 3 or more phenolic hydroxyl groups.

The polycarbonate resin also includes polycarbonates and copolymers having other characteristic groups such as copolyestercarbonate.

The component (C) is 3 to 50 parts by weight, preferably 5 to 5 parts by weight based on 100 parts by weight of the total of (A) and (B).
30 parts by weight are blended. When the amount of (C) is less than 3 parts by weight, the effect of improving the dispersibility of each resin is small and delamination is likely to occur, and when it exceeds 50 parts by weight, PEI itself has excellent properties such as heat resistance and rigidity. Will decrease.

In the resin composition of the present invention, other resins, various rubbers, conventional additives, etc. may be added according to the purpose at the time of mixing the resins and molding, as long as the physical properties are not impaired.
For example, pigments, dyes, reinforcing agents (glass fiber, carbon fiber, potassium titanate fiber, etc.), fillers (carbon black, silica, titanium oxide, etc.), heat-resistant agents, oxidative deterioration inhibitors, weathering agents, lubricants, release agents. A mold agent, a crystal nucleating agent, a plasticizer, an antistatic agent, etc. can be added.

There is no particular limitation on the method for producing the resin composition of the present invention, and ordinary methods can be satisfactorily used. However, the melt-kneading method is generally preferable. The use of small amounts of solvent is possible, but generally not required. Examples of the apparatus include extruders, Banbury mixers, rollers, and kneaders, which are operated batchwise or continuously. The order of mixing the components is not particularly limited.

[0023]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.

The following compounds were used in the examples. Component (A) PEI: ULTEM 1010 (trademark, manufactured by General Electric Company) Component (B) Thermotropic liquid crystal polyester (LCP): Liquid crystal polyester composed of p-hydroxybenzoic acid, terephthalic acid and ethylene glycol, Rodran LC-5000.
(Trademark, manufactured by Unitika Ltd.) Component (C) PC: Polycarbonate of bisphenol A, trademark LE
XAN 131 (manufactured by General Electric Co.) Examples 1-2 and Comparative Examples 1-3 Each component in the amounts (parts by weight) shown in Table 1 was heated at a barrel setting temperature of 320 using a twin-screw extruder (screw diameter of 30 mm). Extrusion was carried out at a temperature of 300 rpm and a pellet was prepared. Test pieces for measuring various physical properties were injection-molded from the pellets and subjected to the following tests.

Melt Index (MI): ASTM
Measured according to D1238 at 300 ° C and 6.7 kg load Izod impact strength: Measured notched Izod impact strength according to ASTM D256 Heat distortion temperature (HDT): According to ASTM D648 1
Measured with 8.6 kg / cm ² load Tensile strength: Measured according to ASTM D638 Delamination: Tensile test piece is bent and visually determined

[0026]

[Table 1]

[0027]

According to the present invention, the melt fluidity is improved,
Moreover, there is no deterioration in mechanical properties and there is no delamination.
A PEI resin composition is obtained. Therefore, the resin composition of the present invention can be used in a wide variety of fields and is industrially very useful.

Claims (1)

[Claims] 1. (A) Polyetherimide resin 60
To 99 parts by weight and (B) thermotropic liquid crystal polyester 1 to 40 parts by weight, and further, (C) a polycarbonate resin 3 to 50 parts by weight based on 100 parts by weight of the total of (A) and (B). Composition.