JPH05214209A - Hydrogenated block copolymer composition - Google Patents

Abstract

PURPOSE:To improve the compatibility between a hydrogenated block copolymer and a polyester resin and to provide a new material which has advantages of both the copolymer and the resin and is excellent in flexibility, heat resistance, moldability, and chemical resistance. CONSTITUTION:100 pts.wt. resin compsn. comprising 90-20wt.% hydrogenated block copolymer obtd. by hydrogenating a block copolymer consisting of at least two terminal polymer blocks A based on a vinylarom. compd. and at least one intermediate polymer block B based on a conjugated diene and 10-80wt.% polyester resin is compounded with 0.1-20 pts.wt. modified polystyrene resin and/or modified polyolefin resin having epoxy, acid anhydride, and oxazoline groups.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a modified polystyrene resin containing a hydrogenated block copolymer and a polyester resin as main components and containing a group which reacts with a hydroxyl group or a carboxylic acid group at the end of the polyester resin. By adding a predetermined amount of modified polyolefin resin / or both, compatibility of both is improved, and various molded products with excellent flexibility, heat resistance, mechanical strength, moldability and chemical resistance are obtained. The present invention relates to a hydrogenated block copolymer composition that can be used as a material.

[0002]

2. Description of the Related Art Recently, a thermoplastic elastomer (hereinafter abbreviated as TPE), which is a rubber-like soft material and does not require a vulcanization step and has the same moldability as a thermoplastic resin, is used for automobile parts, home electric appliances, and wire coating , Footwear, toys, miscellaneous goods, etc. However, TPE does not reach the level of vulcanized rubber in terms of quality in the use of vulcanized rubber, which is one of the wide fields of application as a rubber, and therefore its use in the vulcanized rubber field is limited. Styrene-butadiene block polymers and styrene-isoprene block polymers are one of the typical examples of these TPEs. These TPEs are rich in flexibility and have good rubber elasticity at room temperature. It also has excellent moldability, especially injection moldability, but it has double bonds in the polybutadiene block or polyisoprene block in the polymer, so it has excellent heat aging resistance (heat stability) and weather resistance. There's a problem. By hydrogenating the intramolecular double bond of the block copolymer of styrene and a conjugated diene, an elastomer having improved thermal stability and weather resistance can be obtained. However, this hydrogenated product has drawbacks such as insufficient rubber elasticity at high temperatures, large deformation under heating and pressurization, and poor chemical resistance, and there is still a problem when it is used for vulcanized rubber.

On the other hand, saturated polyester resins generally have a rich surface smoothness and a glossy appearance, although they are somewhat different depending on their structures. Crystalline PET, P
BT has a high melting point and a high degree of crystallinity, and is widely used in film sheets, molded products, etc. because of its excellent dimensional stability, transparency, toughness, electrical insulation, and chemical resistance. It has the drawback of poor workability. Generally heat resistant,
Since it is difficult to obtain a resin composition having good properties such as impact resistance, moldability, chemical resistance, etc. from a single resin, it is possible to use two or more resins capable of compensating for each defect. A technique called polymer alloy is used.
However, the compatibility between each resin is usually poor, and it is difficult to obtain a thermoplastic resin that has the advantages of each resin because it is not possible to form an incompatible micro phase separation structure simply by mixing them. .. As a method of improving the compatibility, a method of adding a compatibilizing agent having an affinity to any of the resins to be combined is generally performed, but in the case of a polyester resin and a styrene resin, a suitable compatibilizing agent is used. However, the improvement effect was insufficient.

[0004]

DISCLOSURE OF THE INVENTION In the present invention, as a result of extensive studies to obtain a compatibilizer having an affinity for both the hydrogenated block copolymer and the polyester resin, the hydroxyl group at the end of the polyester resin or Modified polystyrene-based resin and / or modified polyolefin-based resin containing a group that reacts with a carboxylic acid group remarkably improves the compatibility between the hydrogenated block copolymer and the polyester-based resin, and has excellent flexibility and heat resistance, It was found that a material excellent in mechanical strength, moldability and chemical resistance was obtained, and the present invention was completed.

[0005]

Means for Solving the Problems That is, the present invention comprises a terminal polymer block A mainly containing at least two vinyl aromatic compounds, and an intermediate polymer block B mainly containing at least one conjugated diene compound. Hydrogenated block copolymer obtained by hydrogenating a block copolymer consisting of 90-
At least one of an epoxy group, an acid anhydride group, and an oxazoline group that reacts with a hydroxyl group or a carboxylic acid group at the terminal of the polyester resin with respect to 100 parts by weight of a resin composition composed of 20% by weight and 80 to 10% by weight of the polyester resin. The present invention relates to a hydrogenated block copolymer composition containing 0.1 to 20 parts by weight of a modified polystyrene resin and / or a modified polyolefin resin containing one type of functional group.

The hydrogenated block copolymer used in the present invention comprises a terminal polymer block A mainly containing at least two vinyl aromatic compounds and an intermediate polymer block mainly containing at least one conjugated diene compound. A vinyl aromatic compound having a structure represented by the following general formula, which is obtained by hydrogenating a block copolymer comprising B and
It is a hydrogenated product of a conjugated diene compound block copolymer. A- (BA) _n 1 ≤ n ≤ 5 This hydrogenated block copolymer has a vinyl aromatic compound of 5
-60% by weight, preferably 10-50% by weight. Further, referring to the block structure, the terminal polymer A mainly composed of a vinyl aromatic compound has a vinyl aromatic compound polymer block or a vinyl aromatic compound of 50% by weight. weight%
Having a structure of a copolymer block of a vinyl aromatic compound and a hydrogenated conjugated diene compound, the content of which is more than 70% by weight, and is mainly composed of a hydrogenated conjugated diene compound. The intermediate polymer block B contains a hydrogenated conjugated diene compound polymer block or a hydrogenated conjugated diene compound in an amount of more than 50% by weight, preferably 70% by weight or more, and a hydrogenated conjugated diene compound and vinyl aroma. It has a structure of a copolymer block with a group compound. When there are two or more polymer blocks mainly containing a vinyl aromatic compound and polymer blocks mainly containing a hydrogenated conjugated diene compound, each polymer block may have the same structure or different. It may be a structure.

As the vinyl aromatic compound constituting the hydrogenated block copolymer, for example, one kind or two or more kinds can be selected from styrene, α-methylstyrene, vinyltoluene, p-tert-butylstyrene and the like. Of these, styrene is preferable. As the conjugated diene compound before hydrogenation constituting the hydrogenated conjugated diene compound, for example, one kind or two or more kinds are selected from butadiene, isoprene, 2.3-dimethyl-1.3-butadiene and the like. Among them, butadiene, isoprene and combinations thereof are preferable. The number average molecular weight (Mn) of the hydrogenated block copolymer used in the present invention is 5,000 to 1,000,000, preferably 10,000 to 800,000, more preferably 3
The molecular weight distribution Mw is in the range of 0000 to 500000
/ Mn is 10 or less (Mw: weight average molecular weight). Further, the molecular structure of the hydrogenated block copolymer may be linear, branched, radial or any combination thereof.

The polyester resin used in the present invention is not particularly limited and is commercially available. For example, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), aromatic polycarbonate, polyarylate, liquid crystal polyester and A copolyester resin obtained by using a plurality of raw material components can be mentioned. These may be used alone or in combination of two or more.

In the present invention, the hydrogenated block copolymer (A) and the polyester resin (B) are (A) :( B).
= 90:10 to 20:80 (% by weight). When the blending amount of the polyester resin is less than 10 parts by weight, the effect of improving heat resistance and chemical resistance becomes insufficient, and when the blending amount of the hydrogenated block copolymer is less than 20 parts by weight, flexibility, The effect of improving moldability becomes insufficient.

The functional group of the modified polystyrene-based resin or modified polyolefin-based resin containing a hydroxyl group at the terminal of the polyester resin used in the present invention or a group that reacts with a carboxylic acid group includes an epoxy group, an acid anhydride group and an oxazoline group. Can be mentioned.

As a method for synthesizing the above modified polystyrene resin and modified polyolefin resin, a known radical polymerization method or the like can be applied. For example, a solution or suspension of a polymerizable monomer such as glycidyl methacrylate and a styrene monomer. It can be easily obtained by polymerization or the like. The modification ratio (weight ratio of the functional group-containing monomer at the time of polymerization preparation) of the modified polystyrene resin and modified polyolefin resin of the present invention is 0.1 to 20 wt%, preferably 1 to 18 wt%. Denaturation rate of 0.1 wt%
If it is less than 1, the effect of improving the compatibility cannot be obtained, and if the modification rate is more than 20 wt%, various properties such as moldability are deteriorated due to the high molecular weight due to the reaction with the polyester resin. These modified polystyrene resins and modified polyolefin resins may be used alone or in combination of two or more.

A composition 100 in which the hydrogenated block copolymer (A) and the polyester resin (B) are mixed in a predetermined ratio.
0.1 to 20 parts by weight of a modified polystyrene resin and / or a modified polyolefin resin is blended with respect to parts by weight,
A composition having good compatibility can be obtained by kneading with a twin-screw kneader or the like. If the amount of the modified polystyrene resin and / or the modified polyolefin resin blended is less than 0.1 part by weight, the effect of improving the compatibility becomes insufficient, and
If the blending amount exceeds 20 parts by weight, various properties will be deteriorated due to the high molecular weight.

As described above, the modified polystyrene resin and / or the modified polyolefin resin of the present invention remarkably improves the compatibility between the hydrogenated block copolymer and the polyester resin, and improves the heat resistance and mechanical properties. It has the effect of remarkably improving various properties, because the reaction between the hydroxyl group or carboxylic acid group at the end of the polyester resin and the functional group of the modified polystyrene resin and / or the modified polyolefin resin is the reason. Enables polystyrene (PS)
A graft polymer of a polyester resin and / or a polyolefin (PO) resin and a polyester resin is generated, and this acts as a surfactant to improve the compatibility between the hydrogenated block copolymer and the polyester resin. However, it is considered that it became possible to have an incompatible micro phase separation structure.

If further flexibility is required, a mineral oil called process oil or extender oil may be added as a softening agent for rubber. The composition of the present invention further contains other compounding agents, such as
Inorganic fillers such as talc, mica, calcium carbonate and wollastonite, or reinforcing agents such as glass fibers and carbon fibers, flame retardants, flame retardant aids, antistatic agents, stabilizers, pigments, release agents, etc. It can be blended. As a method for producing the composition of the present invention, all general methods used for producing a usual rubber composition can be adopted. This is basically a mechanical melt-kneading method, and a single-screw extruder, a twin-screw extruder, a Banbury mixer, various kneaders and the like are used for these.

[0015]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. << Examples 1 to 14 and Comparative Examples 1 to 5 >> After thoroughly dry blending the ones having the blending ratios shown in Tables 1, 2, and 3, a resin temperature of 260 to 275 ° C. was obtained using a biaxial kneader. It was melt-kneaded and extruded into pellets under the conditions. The pellets were kneaded at 270 ° C. using a Brabender and then compression molded to prepare test pieces. For these test pieces, hardness, normal temperature tensile strength and elongation, 70 ° C tensile strength and elongation,
The chemical resistance was evaluated. The evaluation results are also shown in Tables 1, 2, 3
Shown in.

[0016]

[0017]

[0018]

* 1: Hydrogenated block copolymer having a styrene content of 20 wt% * 2: Dyanite MA-523V, manufactured by Mitsubishi Rayon Co., Ltd. * 3: Sumibright M192, manufactured by Sumitomo Chemical Co., Ltd. * 4: Polystyrene Modified polystyrene having oxazoline group in side chain * 5: Styrene-based graft polymer having epoxy group in main chain * 6: Maleic anhydride modified polystyrene oligomer * 7: Measured according to JIS K6301 (JIS
A). * 8: Measured according to JIS K6301. Unit of tensile strength: kg / mm ² * 9: A test piece (W1) whose weight was weighed according to JIS K6301 was tested at 70 ° C., NO. 3 After soaking in test oil for 2 hours, it was taken out, the surface was quickly washed with acetone, and the surface was lightly wiped with a filter paper to measure the weight (W2). From this measurement result, the mass change (ΔW) was calculated using the following formula. ΔW = {(W2-W1) / W1} × 100 In the table, ◯ indicates a mass change of less than 10% Δ indicates a mass change of 10 to less than 20% × indicates a mass change of 20% or more. * 10: Sumikasen G804, manufactured by Sumitomo Chemical Co., Ltd. * 11: Ethylene-glycidyl methacrylate-methyl acrylate terpolymer * 12: Ethylene-ethyl acrylate-maleic anhydride terpolymer * 13: Maleic anhydride modified Polypropylene * 14: Maleic anhydride modified polyethylene * 15: Glycidyl methacrylate modified hydrogenated block copolymer with styrene content of 30 wt% * 16: Myric anhydride modified hydrogenated block copolymer with styrene content of 20 wt%

[0020]

As is apparent from the table, the hydrogenated block copolymer composition of the present invention is obtained by adding the modified polystyrene resin and / or the modified polyolefin resin to the hydrogenated block copolymer and the polyester. It is a new and well-balanced material that has a significantly improved compatibility of the system resins, has the advantages of both, is highly flexible, and is excellent in heat resistance, moldability, and chemical resistance.

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Claims (1)

[Claims] 1. A hydrogenated block copolymer comprising at least two terminal polymer blocks A mainly containing vinyl aromatic compounds and at least one intermediate polymer block B mainly containing conjugated diene compounds. An epoxy that reacts with a hydroxyl group or a carboxylic acid group at the end of the polyester resin, relative to 100 parts by weight of a resin composition comprising 90 to 20% by weight of the hydrogenated block copolymer and 80 to 10% by weight of the polyester resin obtained by Group, an acid anhydride group and an oxazoline group, at least one functional group-containing modified polystyrene resin and / or modified polyolefin resin is added in an amount of 0.1 to 20 parts by weight. Polymer composition.