JP2002155194A - Amorphous polyester resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an amorphous polyester resin composition which has both transparency and impact resistance. SOLUTION: The amorphous polyester resin composition comprises 1-40 wt.% of a core-shell impact resistance modifier (1), which comprises 100 pts.wt. in total of (A) 20-80 pts. of a core; (B) 15-60 pts. of an inner layer shell; and (C) 5-20 pts. of an outer layer shell; and has a refractive index of 1.54-1.60, and 60-99 wt.% of an amorphous polyester or copolyester (2), which has a refractive index of 1.54-1.60.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an amorphous polyester resin composition. More specifically, the present invention relates to a novel amorphous polyester resin composition containing a core-shell impact modifier and having excellent transparency and impact resistance.

[0002]

2. Description of the Related Art Amorphous polyester resin compositions have excellent transparency, mechanical properties and gas barrier properties, and are widely used in packaging materials such as bottles and sheets. However, with recent increase in size and complexity of the container, higher impact resistance has been required.

Hitherto, as a means for improving the impact resistance of a polyester resin composition, addition of a fibrous inorganic filler has been attempted, and an effect has been seen in improving the impact resistance. In addition, many attempts have been made to improve the impact resistance by adding a rubbery polymer and a rubber-containing polymer to a polyester resin composition. In particular, it is known that a core-shell impact modifier having a structure in which rubber-like polymer particles are surrounded by a glass-like polymer is effective in improving impact resistance. However, even when the fibrous inorganic filler and the core-shell impact modifier are applied to the amorphous polyester resin composition, the effect is improved in the impact resistance, but the transparency is significantly impaired. It is not easy to achieve both impact resistance and transparency, and it has not been satisfactory.

[0004]

Even when the above-mentioned fibrous inorganic filler and core-shell impact modifier are applied to an amorphous polyester resin composition, they are not effective in improving impact resistance. However, transparency was significantly impaired, and it was not easy to achieve both impact resistance and transparency, and the results were not satisfactory. In order to achieve both impact resistance and transparency with the core-shell impact modifier, the refractive index of the core-shell impact modifier should be close to that of the amorphous polyester resin composition, and It is necessary to enhance the dispersibility of the shell impact modifier in the amorphous polyester resin composition. Therefore, an object of the present invention is to provide an amorphous polyester resin composition having both transparency and impact resistance.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have conducted intensive studies, and as a result, have found a specific core-shell polymer and completed the present invention.

That is, the present invention provides: (A) 30 to 100% by weight of a unit derived from 1,3-diene, 0 to 70% by weight of a unit derived from a vinyl aromatic monomer, 0 to 10% by weight (B) 80 to 100 parts of a core containing units derived from a copolymerizable vinyl monomer and units derived from 0 to 5% by weight of a crosslinking monomer;
From 0 to 20 units by weight of vinyl aromatic monomer
15 to 60 parts of an inner shell containing units derived from a copolymerizable vinyl monomer by weight of 15% to 60%; (C) 10 to 90% by weight of a (meth) acrylic acid ester of an alcohol having 1 to 8 carbon atoms 5 to 20 parts of an outer layer including units derived from a vinyl aromatic monomer, 10 to 90% by weight of a unit derived from a vinyl aromatic monomer, and 0 to 50% by weight of a unit derived from a copolymerizable vinyl monomer. Shell: 1.54 to 100 parts by weight in total
Amorphous polyester or copolyester (2) having a core-shell impact modifier having a refractive index of 1.60 (1) of 1 to 40% by weight and a refractive index of 1.54 to 1.60 (2). 99% by weight of an amorphous polyester resin composition (Claim 1) and a molded article obtained by molding the composition of Claim 1 under conditions that keep the amorphous polyester or copolyester amorphous. Claim 2).

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The core (A) used in the core-shell impact modifier used in the present invention is 30 to 100.
%, Preferably 40 to 90%, more preferably 50 to 80% by weight of units derived from 1,3-diene,
-70% by weight, preferably 10-60% by weight, more preferably 20-50% by weight of units derived from a vinyl aromatic monomer, 0-10% by weight derived from a copolymerizable vinyl monomer And a unit derived from 0 to 5% by weight of a crosslinking monomer. The 1,3-diene used in the present invention is a conjugated diene compound, butadiene, isoprene,
Chloroprene and the like. Butadiene is preferred in terms of strength. Polybutadiene may be used as the core. Since the refractive index of the core-shell impact modifier is different from the refractive index of the amorphous polyester or copolyester, the use of more than 80% by weight is not suitable for the transparency. Is not preferred. On the other hand, if the content is less than 50% by weight, the strength expression strength is undesirably reduced. For this reason, 50-80
It is preferable to use it by weight%. A vinyl aromatic monomer is a compound having one vinylic double bond and one or more benzene nuclei in the same molecule, and specifically, styrene, alpha-methylstyrene, 2-methylstyrene, and 3-methylstyrene. Styrene, 4-methylstyrene, 4-ethylstyrene, 2,5-dimethylstyrene, 4-methoxystyrene, 4-ethoxystyrene, 4-propoxystyrene,
Vinyl aromatic monomers such as 4-butoxystyrene, chlorostyrene, dichlorostyrene, trichlorostyrene, vinyltoluene, bromostyrene, dibromostyrene, tribromostyrene, vinylnaphthalene, isopropenylnaphthalene, isopropenylbiphenyl, divinylbenzene And the like, but are not limited thereto. The use of these is preferable from the viewpoint of transparency, since the refractive index of the rubber particles is increased so as to approach the refractive index of the amorphous polyester resin composition. As copolymerizable vinyl monomers, (meth) acrylates, for example,
Methyl (meth) acrylate, ethyl (meth) acrylate, (meth) acrylate of alcohols having 1 to 8 carbon atoms such as butyl (meth) acrylate, (meth) acrylonitrile, (meth) acrylic acid, (meth) ) Phenyl acrylate, hydroxyalkyl (meth) acrylate, for example, hydroxyethyl (meth) acrylate, (meth)
Hydroxypropyl acrylate, (meth) acrylic acid 4
-Hydroxybutyl, glycidyl (meth) acrylate,
Examples thereof include, but are not limited to, vinyl cyanide compounds such as 3,4-epoxy (meth) acrylate, vinylidene cyanate, and 1,2-dicyanoethylene, and maleimide compounds. Examples of the crosslinking monomer include, but are not limited to, divinylbenzene monoethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, and the like. If the cross-linking monomer is used in an amount exceeding 5% by weight, a decrease in impact strength is observed. Therefore, it is preferable to use the monomer in the range of 0 to 5% by weight.

The inner shell (B) used in the core-shell impact modifier used in the present invention comprises 80 to 100% by weight of a unit derived from a vinyl aromatic monomer, and 0 to 20% by weight of a unit. It consists of units derived from polymerizable vinyl monomers. There is no particular limitation on the method of charging the monomer mixture for forming the inner shell, and a method such as continuous one-stage addition or two-stage addition is used. The vinyl aromatic monomer forming the inner shell is a compound having one vinylic double bond and one or more benzene nuclei in the same molecule, and specifically, styrene, alpha-methylstyrene, 2-methyl styrene,
3-methylstyrene, 4-methylstyrene, 4-ethylstyrene, 2,5-dimethylstyrene, 4-methoxystyrene, 4-ethoxystyrene, 4-propoxystyrene, 4-butoxystyrene, chlorostyrene, dichlorostyrene, trichlorostyrene , Vinyl toluene, bromostyrene, dibromostyrene, tribromostyrene,
Examples include, but are not limited to, vinyl aromatic monomers such as vinyl naphthalene, isopropenyl naphthalene, isopropenyl biphenyl, and divinyl benzene. Use of these is preferable from the viewpoint of transparency because the refractive index of the shell is increased and the refractive index of the shell is made closer to that of the amorphous polyester resin composition. Examples of the copolymerizable vinyl monomer include (meth) acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate, and butyl (meth) acrylate having 1 to 8 carbon atoms. (Meth) acrylate, (meth) acrylonitrile, (meth) acrylic acid, phenyl (meth) acrylate, hydroxyalkyl (meth) acrylate,
For example, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, glycidyl (meth) acrylate, butyl 3,4-epoxy (meth) acrylate, vinylidene cyanate , 1,2-dicyanoethylene and the like, and maleimide-based compounds, but are not limited thereto. The outer shell (C) used in the core-shell impact modifier used in the present invention comprises 10 to 90% by weight of a unit derived from a (meth) acrylate of an alcohol having 1 to 8 carbon atoms,
A unit derived from 90% by weight of a vinyl aromatic monomer,
It is composed of 50% by weight of units derived from a copolymerizable vinyl monomer. There is no particular limitation on the method of charging the monomer mixture for forming the outer shell, and a method such as continuous one-stage addition or two-stage addition is used. 1-8 carbon atoms forming the outer layer shell
As the (meth) acrylic acid ester of the alcohol, an acrylic acid or methacrylic acid ester compound, for example,
Examples include, but are not limited to, methyl methacrylate, ethyl methacrylate, butyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, and the like. It is preferable to use these in order to improve the dispersibility with the amorphous polyester resin composition. Examples of the vinyl aromatic monomer include styrene, alpha-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 4-ethylstyrene,
2,5-dimethylstyrene, 4-methoxystyrene, 4
-Ethoxystyrene, 4-propoxystyrene, 4-butoxystyrene, chlorostyrene, dichlorostyrene,
Examples include, but are not limited to, vinyl aromatic monomers such as trichlorostyrene, vinyltoluene, bromostyrene, dibromostyrene, tribromostyrene, vinylnaphthalene, isopropenylnaphthalene, isopropenylbiphenyl, divinylbenzene, etc. is not. Use of these is preferable from the viewpoint of transparency, since the refractive index of the shell is brought close to the refractive index of the amorphous polyester resin composition. Acrylic acid, methacrylic acid, methacrylonitrile, acrylonitrile, vinylidene cyanate, 1,2
-Cyanide vinyl compounds such as dicyanethylene, maleimide compounds, and the like, but are not limited thereto. The inner shell and the outer shell are provided in the core-shell impact modifier because the inner shell brings the refractive index of the core-shell impact modifier closer to the refractive index of the amorphous polyester resin composition. This is for imparting a function of enhancing the dispersibility of the core-shell impact modifier in the amorphous polyester resin composition. The particle size of the core-shell impact modifier is not particularly limited.
If it is less than μm, the degree of improvement in impact strength is small, and
If it exceeds 5 μm, the transparency is greatly reduced.
It is preferably about 0.5 μm. A method for adjusting the particle size of this butadiene copolymer is described in
No. 12158, a method of coagulating and enlarging during graft polymerization using a water-soluble electrolyte, or a method disclosed in JP-A-8-012
No. 704, a method using an acid group-containing latex comprising a copolymer of a (meth) acrylate and an unsaturated acid can also be used. Examples of the amorphous polyester resin composition modified by the present invention include the amorphous polyester of the present invention such as PET, and PETG of Eastman Kodak (for example, (poly) ethylene-
(Co-1,4 cyclohexane dimethylene terephthalate)
Examples of the amorphous copolyester of the present invention include poly (C1-C6 alkylene terephthalate), alkylene naphthalene dicarboxylates such as poly (ethylene naphthalene-2,6-dicarboxylate), and at least one Aliphatic diols or cycloaliphatic diols or combinations of aliphatic and cycloaliphatic diols and amorphous polyesters containing units derived from one or more aromatic dibasic acids are included. For example, copolyesters containing units derived from polyethylene terephthalate (PET), polypentylene terephthalate, etc., or two glycols (eg, ethylene glycol and cyclohexane dimethanol) or two basic acids (eg, terephthalic acid and isophthalic acid) Is included. Such polyesters can be obtained by polycondensing a polyol component (for example, ethylene glycol) and a dicarboxylic acid component (for example, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, etc.), and can be obtained from two or more polyesters. The same is true for the resulting mixture.

The core-shell impact modifier of the present invention can be obtained by emulsion polymerization, suspension polymerization, solution polymerization or the like, but emulsion polymerization is preferred. The emulsion polymerization is produced by a known emulsification method and polymerization sequence.

The amounts of the core-shell impact modifier (1) and the amorphous polyester or copolyester (2) differ depending on the application. % By weight, and 60 to 99% by weight of the amorphous polyester or copolyester (2) is suitable. The method for preparing the composition of the present invention from the core-shell impact modifier (1) and the amorphous polyester or copolyester (2) is not particularly limited, and a known method can be employed. The composition of the present invention, in addition to the amorphous polyester resin and the core-shell impact modifier, commonly used in the amorphous polyester resin composition, for example, fibrous inorganic fillers, pigments and the like It goes without saying that the components may be appropriately added and blended.

The method for producing the resin composition of the present invention includes preparing an amorphous polyester resin and a core-shell impact modifier individually in advance and then using a conventional blending method such as a Henschel mixer or a tumbler. After using and mixing, a method of shaping with a device used for normal shaping such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, and a heating roll to form a resin composition can be adopted. Further, the resin composition of the present invention may be used as an ordinary additive such as an antioxidant, a heat stabilizer, a light resistance improver, an ultraviolet absorber, a lubricant, a plasticizer, a release agent, an antistatic agent, and a sliding agent. It is permissible to add a property improver, a colorant, and the like.

[0012]

EXAMPLES The composition of the present invention will be described with reference to examples, but these are all illustrative and do not limit the content of the present invention. In the Examples and Comparative Examples, various physical properties were evaluated by the following methods. Parts and% represent parts by weight and% by weight, respectively, unless otherwise specified. 100 parts of an amorphous polyester resin (Easter 6763 manufactured by Eastman Kodak Co.) was added with 5 to 15 parts of a core-shell impact modifier and 1 part of a lubricant, preliminarily mixed, and heated by Kansai Roll 8 inches. Melt and knead with a roll, 0.5m
m of sheets were obtained. Press molding the obtained sheet,
A test piece for measuring transparency and an Izod impact strength test piece were obtained. Izod impact strength was measured at room temperature (23 ° C.) according to JIS K-7110. The test piece was a molded product with a 3 mm notch. Transparency was measured according to ASTM D-1003. The test piece was a molded product of 0.5 mm. The average particle diameter was measured with a particle size analyzer UPA manufactured by Microtrac Co., Ltd. using latex as a core-shell impact modifier. Hereinafter, the present invention will be described in detail with reference to examples.

(Example 1) 200 parts of pure water, 1.5 parts of sodium oleate, 0.002 parts of ferrous sulfate, 0.005 parts of ethylenediaminetetraacetic acid · 2Na salt
Part, sodium formaldehyde sulfoxylate 0.2
, 0.2 part of tripotassium phosphate, 76 parts of butadiene, 24 parts of styrene, 1.0 part of divinylbenzene and 0.1 part of diisopropylbenzene hydroperoxide were charged into a polymerization vessel equipped with a stirrer, and polymerized at 50 ° C. for 15 hours. A rubber latex (a) having a conversion of 99% and an average particle diameter of 0.07 μm was prepared. The above rubber latex (a) 180
Parts (solid content 60 parts), pure water 200 parts, ferrous sulfate 0.0
02 parts, 0.004 part of ethylenediaminetetraacetic acid.2Na salt and 0.1 part of sodium formaldehyde sulfoxylate were mixed, and styrene 3 was added at 60 ° C.
A mixture of 0 parts and 0.2 parts of cumene hydroperoxide was continuously added to prepare an inner shell. After the polymerization of the inner shell, a mixed solution of 5 parts of styrene, 5 parts of methyl methacrylate, and 0.2 part of cumene hydroperoxide is continuously added at 60 ° C. to prepare an outer shell, and the core-shell impact resistance is improved. An agent latex was prepared. The obtained core-shell impact modifier latex was coagulated with hydrochloric acid, and after heat treatment, washing, dehydration and drying, a powdery core-shell impact modifier was prepared.

(Example 2) 180 parts (a solid content: 60 parts) of rubber latex (a) prepared by the same method as in Example 1, 200 parts of pure water, 0.002 parts of ferrous sulfate, and 2.5 parts of sodium sulfate Parts, 0.004 part of ethylenediaminetetraacetic acid.2Na salt and 0.1 part of sodium formaldehyde sulfoxylate were mixed, and a mixed solution of 30 parts of styrene and 0.2 parts of cumene hydroperoxide was added at 60 ° C. Continuous addition was performed to prepare an inner shell. After the polymerization of the inner shell, a mixed solution of 5 parts of styrene, 5 parts of methyl methacrylate, and 0.2 part of cumene hydroperoxide is continuously added at 60 ° C. to prepare an outer shell, and the core-shell impact resistance is improved. An agent latex was prepared. The obtained core-shell impact modifier latex was coagulated with hydrochloric acid, and after heat treatment, washing, dehydration and drying, a powdery core-shell impact modifier was prepared. (Example 3) 180 parts (a solid content of 60 parts) of rubber latex (a) prepared by the same method as in Example 1, 200 parts of pure water,
A mixture of 0.002 parts of ferrous sulfate, 0.004 parts of ethylenediaminetetraacetylic acid / 2Na salt, and 0.1 part of sodium formaldehyde sulfoxylate was added to form a mixture.
A mixture of 30 parts of styrene and 0.2 parts of cumene hydroperoxide was continuously added at 0 ° C. to prepare an inner shell. After completion of the inner shell polymerization, a mixture of 5 parts of styrene, 5 parts of butyl acrylate, and 0.2 part of cumene hydroperoxide was continuously added at 60 ° C. to prepare an outer shell.
A core-shell impact modifier latex was prepared. The obtained core-shell impact modifier latex was coagulated with hydrochloric acid, and after heat treatment, washing, dehydration and drying, a powdery core-shell impact modifier was prepared. Example 4 180 parts (a solid content of 60 parts) of rubber latex (a) prepared by the same method as in Example 1, 200 parts of pure water,
A mixture of 0.002 parts of ferrous sulfate, 0.004 parts of ethylenediaminetetraacetylic acid / 2Na salt, and 0.1 part of sodium formaldehyde sulfoxylate was added to form a mixture.
A mixture of 30 parts of styrene and 0.2 parts of cumene hydroperoxide was continuously added at 0 ° C. to prepare an inner shell. After completion of the polymerization of the inner shell, a mixed solution of 5 parts of styrene, 5 parts of acrylonitrile, and 0.2 part of cumene hydroperoxide was continuously added at 60 ° C. to prepare an outer shell.
A core-shell impact modifier latex was prepared. The obtained core-shell impact modifier latex was coagulated with hydrochloric acid, and after heat treatment, washing, dehydration and drying, a powdery core-shell impact modifier was prepared. (Example 5) 180 parts (a solid content: 60 parts) of rubber latex (a) prepared by the same method as in Example 1, 200 parts of pure water,
A mixture of 0.002 parts of ferrous sulfate, 0.004 parts of ethylenediaminetetraacetylic acid / 2Na salt, and 0.1 part of sodium formaldehyde sulfoxylate was added to form a mixture.
A mixture of 30 parts of styrene and 0.2 parts of cumene hydroperoxide was continuously added at 0 ° C. to prepare an inner shell. After completion of the polymerization of the inner shell, a mixed solution of 5 parts of styrene, 5 parts of 2-ethylhexyl acrylate, and 0.2 part of cumene hydroperoxide is continuously added at 60 ° C. to prepare an outer shell, and the core-shell impact resistance is improved. An agent latex was prepared. The obtained core-shell impact modifier latex was coagulated with hydrochloric acid, and after heat treatment, washing, dehydration and drying, a powdery core-shell impact modifier was prepared. (Example 6) 180 parts (a solid content: 60 parts) of rubber latex (a) prepared by the same method as in Example 1, 200 parts of pure water,
A mixture of 0.002 parts of ferrous sulfate, 0.004 parts of ethylenediaminetetraacetylic acid / 2Na salt, and 0.1 part of sodium formaldehyde sulfoxylate was added to form a mixture.
A mixed solution of 29 parts of styrene, 1 part of methyl methacrylate, and 0.2 part of cumene hydroperoxide was continuously added at 0 ° C. to prepare an inner shell. After the inner shell polymerization,
A mixed solution of 6 parts of styrene, 4 parts of methyl methacrylate, and 0.2 part of cumene hydroperoxide was continuously added at 60 ° C. to prepare an outer layer shell, thereby preparing a core-shell impact modifier latex. The resulting core-shell impact modifier latex is coagulated with hydrochloric acid, heat treated, washed,
After dehydration and drying, a powdery core-shell impact modifier was prepared.

(Example 7) 200 parts of pure water, 1.5 parts of sodium oleate, 0.002 parts of ferrous sulfate, 0.005 parts of ethylenediaminetetraacetic acid · 2Na salt
Part, sodium formaldehyde sulfoxylate 0.2
Parts, 0.2 parts of tripotassium phosphate, 100 parts of butadiene,
1.0 part of divinylbenzene and 0.1 part of diisopropylbenzene hydroperoxide were charged into a polymerization vessel equipped with a stirrer, polymerized at 50 ° C. for 15 hours, and the polymerization conversion was 99%.
Rubber latex (b) having an average particle size of 0.07 μm was prepared. 140 parts of the above rubber latex (b) (solid content 46
Parts), 200 parts of pure water, 0.002 parts of ferrous sulfate, ethylenediaminetetraacetic acid / 2Na salt 0.1 part.
004 parts and 0.1 part of sodium formaldehyde sulfoxylate were mixed, and a mixture of 39 parts of styrene and 0.2 part of cumene hydroperoxide was continuously added at 60 ° C.
An inner shell was prepared. After completion of inner layer shell polymerization, 60 ° C
Then, a mixture of 10 parts of styrene, 5 parts of methyl methacrylate, and 0.2 part of cumene hydroperoxide was continuously added to prepare an outer layer shell, and a core-shell impact modifier latex was prepared. The obtained core-shell impact modifier latex was coagulated with hydrochloric acid, and after heat treatment, washing, dehydration and drying, a powdery core-shell impact modifier was prepared. Example 8 180 parts (a solid content of 60 parts) of rubber latex (a) prepared by the same method as in Example 1, 200 parts of pure water,
A mixture of 0.002 parts of ferrous sulfate, 0.004 parts of ethylenediaminetetraacetylic acid / 2Na salt, and 0.1 part of sodium formaldehyde sulfoxylate was added to form a mixture.
A mixture of 25 parts of styrene and 0.2 parts of cumene hydroperoxide was continuously added at 0 ° C. to prepare an inner shell. After completion of the inner shell polymerization, 10 parts of styrene at 60 ° C.,
A mixed solution of 5 parts of methyl methacrylate and 0.2 part of cumene hydroperoxide was continuously added to prepare an outer shell, and a core-shell impact modifier latex was prepared. The obtained core-shell impact modifier latex was coagulated with hydrochloric acid, and after heat treatment, washing, dehydration and drying, a powdery core-shell impact modifier was prepared. (Example 9) Pure water 200 parts, sodium oleate 1.5
Parts, ferrous sulfate 0.002 parts, ethylenediaminetetraacetylic acid · 2Na salt 0.005 parts, formaldehyde sulfoxylate sodium 0.2 parts, tripotassium phosphate 0.2 parts, butadiene 70 parts, styrene 30
Parts, 1.0 part of divinylbenzene and 0.1 part of diisopropylbenzene hydroperoxide were charged into a polymerization vessel equipped with a stirrer, and polymerized at 50 ° C. for 15 hours to give a polymerization conversion of 99 parts.
%, A rubber latex (c) having an average particle diameter of 0.07 μm was prepared. 200 parts of the above rubber latex (c) (solid content: 66 parts), 200 parts of pure water, 0.002 parts of ferrous sulfate, 0.004 parts of ethylenediaminetetraacetylic acid / 2Na salt, sodium formaldehyde sulfoxylate 0 .1 part, and a mixed solution of 19 parts of styrene and 0.2 part of cumene hydroperoxide was continuously added at 60 ° C. to prepare an inner shell. After completion of inner layer shell polymerization, 6
A mixed solution of 10 parts of styrene, 5 parts of methyl methacrylate, and 0.2 part of cumene hydroperoxide was continuously added at 0 ° C. to prepare an outer layer shell, thereby preparing a core-shell impact modifier latex. The resulting core-shell impact modifier latex is coagulated with hydrochloric acid, heat treated, washed,
After dehydration and drying, a powdery core-shell impact modifier was prepared.

The results of the test evaluation are shown in Table 1.

[0017]

[Table 1] (Comparative Example 1) 180 parts (a solid content: 60 parts) of rubber latex (a) prepared by the same method as in Example 1, 200 parts of pure water,
A mixture of 0.002 parts of ferrous sulfate, 2.5 parts of sodium sulfate, 0.004 parts of ethylenediaminetetraacetic acid / 2Na salt, and 0.1 part of sodium formaldehyde sulfoxylate, and 5 parts of styrene at 60 ° C. , 5 parts of methyl methacrylate, and 0.2 parts of cumene hydroperoxide were continuously added to prepare an inner shell. After completion of the polymerization of the inner shell, a mixed solution of 30 parts of styrene and 0.2 part of cumene hydroperoxide was continuously added at 60 ° C. to prepare an outer shell, and a core-shell impact modifier latex was prepared. The resulting core-shell impact modifier latex is coagulated with hydrochloric acid, heat treated, washed,
After dehydration and drying, a powdery core-shell impact modifier was prepared.

Comparative Example 2 180 parts (a solid content: 60 parts) of rubber latex (a) prepared in the same manner as in Example 1, 200 parts of pure water, 0.002 parts of ferrous sulfate, and 2.5 parts of sodium sulfate , 35 parts of styrene, 5 parts of methyl methacrylate, and 0 parts of cumene hydroperoxide at 60 ° C. were mixed with 0.004 parts of ethylenediaminetetraacetic acid.2Na salt and 0.1 part of sodium formaldehyde sulfoxylate. 2 parts of the mixture were continuously added to prepare a shell, and a core-shell impact modifier latex was prepared. The obtained core-shell impact modifier latex was coagulated with hydrochloric acid, and after heat treatment, washing, dehydration and drying, a powdery core-shell impact modifier was prepared.

[0019]

According to the present invention, an amorphous polyester resin composition having improved impact resistance without significantly impairing the optical properties of the amorphous polyester resin is obtained and is industrially useful.

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Claims (2)

[Claims] (A) 30 to 100% by weight of units derived from 1,3-diene, 0 to 70% by weight of units derived from a vinyl aromatic monomer, 0 to 10% by weight of copolymerizable 20 to 80 parts of a core containing units derived from a natural vinyl monomer, 0 to 5% by weight of units derived from a crosslinking monomer;
(B) 15 to 60 parts of an inner shell containing 80 to 100% by weight of a unit derived from a vinyl aromatic monomer and 0 to 20% by weight of a unit derived from a copolymerizable vinyl monomer;
(C) 10 to 90% by weight of an alcohol having 1 to 8 carbon atoms
Units derived from (meth) acrylates, 10 to 90
0 to 50% by weight of units derived from vinyl aromatic monomer
5 to 20 parts of an outer shell containing units derived from a copolymerizable vinyl monomer by weight; core-shell resistant having a refractive index of 1.54 to 1.60 including a total of 100 parts by weight. Impact modifier (1) 1 to 40% by weight and 1.54 to
An amorphous polyester resin composition having a refractive index of 1.60 and comprising 60 to 99% by weight of an amorphous polyester or copolyester (2). 2. A molded article obtained by subjecting the composition according to claim 1 to a condition under which the amorphous polyester or copolyester is kept amorphous.