JPH02202545A - Resin composition of polycarbonate with polyester - Google Patents

Abstract

PURPOSE:To obtain the title composition providing molded articles having iridescent luster and impact resistance containing a specific copolymer of alpha- olefin and glycidyl ester. CONSTITUTION:100 pts.wt. total amounts of 30-80 pts.wt. aromatic polycarbonate and 70-20 pts.wt. aromatic polyester are blended with 0.5-30 pts.wt. copolymer consisting essentially of alpha-olefin and alpha,beta-unsaturated glycidyl ester. The aromatic polycarbonate has preferably about 0.30-1.00 intrinsic viscosity (measured in methylene chloride at 25 deg.C). Poly(1,4-butylene) terephthalate is preferably used as the aromatic polyester.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resin composition containing an aromatic polycarbonate and an aromatic polyester, and particularly relates to the resin composition characterized in that a molded article has no pearlescent luster. .

[Conventional technology]

In order to improve the impact resistance of a resin composition consisting of aromatic polycarbonate and aromatic polyester, ethylene-
Vinyl acetate copolymer, ethylene-propylene copolymer,
It is known to mix a thermoplastic soft resin selected from a polyester elastomer and an ethylene-ethyl acrylate copolymer or a butadiene-based graft copolymer (Japanese Patent Publication No. 58-13588, Japanese Patent Publication No. 55-94)
35). However, although this technique improves impact resistance, it produces a pearlescent appearance on the surface of the molded product, which is undesirable for many molded product applications. This pearlescent luster is noticeable when the molded article is colored, especially when it is black, and has an appearance like an oil film on water.

[Problem to be solved by the invention]

The object of the present invention is to improve the impact resistance of molded products without causing the problem of pearlescence as described above.

[Means to solve the problem]

The present invention provides a resin composition containing aromatic polycarbonate and aromatic polyester, in which 0.5 to 100 parts by weight of 30 to 80 parts by weight of aromatic polycarbonate and 70 to 20 parts by weight of aromatic polyester are used. This is a resin composition containing a copolymer mainly consisting of 30 parts by weight of an α-olefin and a glycidyl ester of an α,β-unsaturated acid.

α-olefin and α used in the present invention.

In copolymers mainly composed of glycidyl esters of β-unsaturated acids, α-olefins include, for example, ethylene, propylene, butene-1, isobutylene, pentene-1, hexene-1, heptene-1, octene-1
, dodecene-1,4-methylpentene-1, and the like. Among these, particularly preferred are ethylene and propylene. Glycidyl esters of α,β-unsaturated acids typically include glycidyl methacrylate and glycidyl acrylate. In addition, other vinyl compounds may be used as comonomers containing relatively low metal content, such as styrene, vinyl acetate, methyl methacrylate, methyl acrylate, ethyl acrylate,
Vinyl chloride, α-methylstyrene, divinylbenzene,
Examples include acrylic acid, tetrafluoroethylene, difluoroethylene, vinylidene chloride, acrylonitrile, and acrylamide. The copolymer may be a random copolymer, a block copolymer, or a graft copolymer.

The above copolymer is used in an amount of 0.5 to 30 parts per 100 parts of aromatic polycarbonate and aromatic polyester in total.
It is mixed in an amount of 1 to 15 parts by weight, preferably 1 to 15 parts by weight. If the amount is less than this, the improvement in impact resistance will be insufficient, while if it is more than this, the heat resistance and mechanical strength will decrease.

The aromatic polycarbonates used in the present invention are known and can be made by reacting dihydric phenols with carbonate precursors such as phosgene, heroformates, or carbonate esters. Generally, this aromatic polycarbonate has a repeating unit of the following structural formula.

-(-0-A-0-C+ In the formula, A is a divalent aromatic residue of dihydric phenol used in the above polymer production reaction.The aromatic polycarbonate used in the present invention has an intrinsic viscosity (methylene chloride 2nd year middle school
It is preferably measured at 5°C and has a unit of dl/g) of about 0.30 to 1.00. The dihydric phenols used to form such aromatic polycarbonates are mononuclear or polynuclear aromatic compounds in which two hydroxyl groups are each bonded to a carbon atom of an aromatic nucleus as functional groups. Aromatic polycarbonates derived from bisphenol A and phosgene are commonly used. A more detailed description of aromatic polycarbonates can be found, for example, in JP-A-63-215.
It is in Publication No. 763.

The aromatic polyester used in the present invention itself is well known, and is a polymer or copolymer obtained by a condensation reaction containing an aromatic dicarboxylic acid or its ester-forming derivative and a diol or its ester-forming derivative as the main components. It is. Examples of the aromatic dicarboxylic acid component include dicarboxylic acids having a benzene nucleus such as terephthalic acid and isophthalic acid; dicarboxylic acids having a naphthalene nucleus such as naphthalene-1,5-dicarboxylic acid and naphthalene-2,7-dicarboxylic acid; Examples include ester-forming derivatives. In addition, dicarboxylic acids other than aromatic dicarboxylic acids, such as adipic acid, sepatic acid, and ester-forming derivatives thereof may be co-concentrated. The diol component is 2 (CH2). 0H (n is 2 to 10
(an integer of
Examples include diols having an aromatic ring such as bisphenol A, and ester-forming derivatives thereof. Preferred aromatic polyesters include poly(1,4-butylene) terephthalate, polyethylene terephthalate, 1,
4-cyclohexylene dimethylene ethylene phthalate-1~/isophthalate co-Φ combination, especially poly(1,4-butylene)
It is terephthalate. The molecular range thereof is preferably one having an intrinsic viscosity of 0.50 or more, particularly preferably 0.55 or more, as measured at 30°C using a 1:1 weight ratio compound of phenol and tetrachloroethane as a solvent. are used.

Aromatic polycarbonate and aromatic polyester are 30
~80:70-20, preferably 40-70:60-3
Used with a weight ratio of 0.

In addition to the above components, the resin composition of the present invention may contain any conventional additives, such as pigments, dyes, reinforcing agents, fillers, heat resistant agents, oxidative deterioration inhibitors, weathering agents, lubricants, mold release agents, and crystal nuclei. additives, plasticizers, flame retardants, flow improvers, antistatic agents, etc.

The resin composition of the present invention can be obtained by mixing the above components in any order, and melt mixing is generally preferred. There are no particular restrictions on the temperature and time required for melt mixing, and they can be appropriately determined depending on the composition of the materials. Examples of mixing devices include extruders, Banbury mixers, rollers, kneaders and the like.

The resin composition of the present invention is particularly suitable for molding by injection molding or extrusion molding, and the present invention also includes such molded products.

Here, it is mentioned that it is known to mix into polycarbonate or polyester a copolymer of α,β-unsaturated acid with glycidyl ester, which constitutes an α-olefin (Japanese Patent Application Laid-Open No. 57-1991). Publication No. 125253 discloses that α-olefin and glycidyl (meth) are added to polycarbonate.
Polycarbonates with improved impact properties are disclosed by incorporating copolymers with acrylates. Special Public Service 1984-1984
No. 419 discloses incorporating a copolymer of α-olefin and glycidyl methacrylate into an aromatic saturated polyester to improve impact properties. Unexamined Japanese Patent Publication 1973
Publication No. 137155 discloses that a composition comprising polyalkylene terephthalate and a fibrous or granular reinforcing agent is blended with an α-olefin and a glycidyl ester of an α,β-unsaturated acid to increase surface gloss and improve durability. It is disclosed that impact resistance and rigidity are improved.

The above-mentioned known documents are aimed at resin compositions containing only either polycarbonate or polyester, and are aimed at improving the impact resistance or reducing the surface gloss due to the inclusion of a reinforcing agent.

In addition, Japanese Patent Publication No. 59-28223 discloses that in a matrix made of polyester resin and polycarbonate resin,
It is disclosed that a dispersed phase of 0.01 to 1.0 micron particle size which may have epoxy groups is bonded.

The granular dispersed phase improves ductility and toughness.

The above-mentioned known publications do not disclose or suggest a technique for eliminating the pearlescent luster of a molded product of resin S1 containing both aromatic polycarbonate and aromatic polyester.

The invention will be further explained below by means of examples.

The aromatic polycarbonate (PC) used in the examples is a polycarbonate derived from bisphenol A and phosgene (trademark Lexan 131, manufactured by Engineering Plastics Co., Ltd.).

Aromatic polyester is polybutylene terephthalate (P
BT) (trademark Barox 310. Engineering Plastics Co., Ltd.).

Ethylene-glycidyl methacrylate copolymer was used as the glycidyl ester of α-olefin and α,β-unsaturated acid. This contains about 89% ethylene and 3g
/lo melt index (JIS K6760)
has.

For comparison, ethylene-ethyl acrylate copolymer (
EE△, trademark NUC-6570, Nippon Unicar Co., Ltd.), ethylene-vinyl acetate copolymer (EVA, trademark DPDJ-3269, Nippon Unicar Co., Ltd.), or polyester elastomer (trademark, 1-01 [10d
JIQ, Engineering Plus Dix Co., Ltd.) was used.

In addition, as a stabilizer, trisphenylphosphor 1~
In each composition, 0.2 parts of T was used (not shown in Table 1).

Carbon black was used as a colorant.

Each component of m (parts by weight) shown in Table 1 was mixed in a Henschel mixer and extruded at 270'C in a 65 simple screw extruder to prepare pellets. 1q peret] - 120
It was dried in an oven at 10°C for 4 hours and injection molded at about 260°C to produce an Izot test piece and a 50m square plate (thickness: 3 mm). 1/8'' Izo impact strength (notched) was measured according to AST)l D256.

The pearlescent luster of the molded product was determined by observing the surface of the square plate with the naked eye under natural light. The results are shown in Table 1.

Molded articles using EEA, EVA or polyester elastomers exhibited intense pearlescent luster, but molded articles using ethylene-glycidyl methacrylate-1 copolymer according to the present invention, while having high impact strength. Moreover, it did not exhibit pearlescent luster.

Claims (1)

[Claims] 1. In a resin composition containing aromatic polycarbonate and aromatic polyester, 0.5 to 30 parts by weight based on a total of 100 parts by weight of 30 to 80 parts by weight of aromatic polycarbonate and 70 to 20 parts by weight of aromatic polyester. A resin composition containing a copolymer mainly consisting of an α-olefin and a glycidyl ester of an α,β-unsaturated acid.