JPH07118335A - Hydrogenated diene copolymer - Google Patents

Abstract

PURPOSE:To obtain a diene copolymer which, when added to a thermoplastic resin, can give a composition of an excellent balance among heat resistance, processability, transparency, rigidity and molding appearance by highly hydrogenating a specified block copolymer. CONSTITUTION:The copolymer comprises a block copolymer composed of polymer blocks A, B and C [wherein A is a polymer block segment comprising at least 80wt.% vinylaromatic compound; B is a polymer block segment comprising at least 70wt.% conjugated diene compound and having a vinyl bond content in the compound of at least 70%; and C is a polybutadiene block segment having a 1,2-vinyl bond content of below 30%] and having a block structure of A-B-C, (A-B)n-C or (C-B-A)=X (wherein n and m are each an integer of 2 or greater; and X is a residue of a coupling agent), having an A content of 35-90wt.%, a B content of 5-60wt.% and a C content of 5-60wt.% (A+B+C =100wt.%), having a number-average molecular weight of 40000-700000 and having a degree of hydrogenation of the olefinically unsaturated bonds of at least 80%.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a hydrogenated diene copolymer obtained by hydrogenating a special block copolymer.

[0002]

2. Description of the Related Art A diene copolymer having a double bond in the polymer is inferior in thermal stability, weather resistance and ozone resistance.
As a means for improving this, a method of hydrogenating an unsaturated double bond (hereinafter referred to as "hydrogenation") is known,
As the method, for example, Japanese Patent Publication No. 43-19960, Japanese Patent Publication No. 45-39275, and Japanese Patent Publication No. 45-35.
55, JP-A-56-62805, JP-A-5
9-133203 and the like. The hydrogenated polymers obtained by these methods exhibit heat resistance, weather resistance, and ozone resistance as expected, and are therefore often used for resin modification applications and the like. Further, ethylene-α-olefin copolymers and the like are known as polymers having excellent thermal stability and weather resistance. However, when these polymers are blended with a thermoplastic resin, it is insufficient to obtain a composition having a good balance of processability, transparency, rigidity, coatability and molding appearance.

[0003]

SUMMARY OF THE INVENTION The present invention has been made against the background of the above-mentioned conventional technical problems. When it is made into a pellet product, it can be easily pelletized and the blocking resistance of the pellet is improved. In addition, it is excellent in heat resistance, weather resistance, ozone resistance, and as a modifier of other resins, hydrogenated diene type that can improve properties such as processability, transparency, rigidity, paintability, and molding appearance. It is to provide a copolymer.

[0004]

The present invention relates to (I) a molecule
Containing polymer blocks A, B and C (provided that A
Is a polymer containing 80% by weight or more of a vinyl aromatic compound
Block segment, B is 70 parts by weight of conjugated diene compound
% Or more and the vinyl bond content of the conjugated diene compound
Is 70% by weight or more, a polymer block segment, C
Is polybuta having less than 30% by weight of 1,2-vinyl bonds
It is the dien block segumet. ), And block structure
Is ABC, (AB) n-C, (C-B-A) m-
X (however, n and m are integers of 2 or more, X is a coupling
It is a drug residue. ) A straight or branched chain represented by
It is composed of a lock copolymer, and the content of the polymer block A is
35 to 90% by weight, the content of the polymer block B is 5 to 6
0% by weight, the content of polymer block C is 5 to 60% by weight
(However, A + B + C = 100% by weight)
Block copolymer having a number average molecular weight of 40,000 to 700,000,
80% or more of the olefinic unsaturated bonds in the copolymer
Hydrogenated diene-based copolymer (hereinafter referred to as "hydrogenated
Diene copolymer ". ) Is provided.

In the present invention, the hydrogenated diene-based copolymer is modified with at least one functional group (hereinafter referred to as "modified hydrogenated diene-based copolymer"). ) Is provided.

The hydrogenated diene-based copolymer of the present invention contains polymer blocks A, B and C in the molecule, and the monomer unit constituting the block A contains a vinyl aromatic compound in an amount of 80% by weight or more. , Preferably 90% by weight or more.

The vinyl aromatic compound constituting the hydrogenated diene copolymer is styrene, t-butyl styrene,
Examples thereof include α-methylstyrene, p-methylstyrene, divinylbenzene, 1,1-diphenylstyrene, N, N-diethyl-p-aminoethylstyrene and vinylpyridine, and styrene and α-methylstyrene are particularly preferable. The other monomer constitutional unit is not particularly limited, but 1,3-butadiene, isoprene, 2,3-
Dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, 1,3-hexadiene, 4,5-diethyl-1,3-octadiene,
Conjugated diene compounds such as chloroprene, particularly 1,3-butadiene, isoprene, and 1,3-pentadiene are preferable, and 1,3-butadiene is more preferable.

The block B contains 80% by weight or more of the conjugated diene compound before hydrogenation, and the vinyl bond content of the conjugated diene compound (in this case, vinyl bond means 1,2-vinyl bond and 3,4-vinyl bond). 70% by weight of the total amount of bonds)
Is a conjugated diene polymer block segment.
When the vinyl bond content of the conjugated diene compound is 70% by weight or less, the processability and transparency improving effect of the composition obtained by blending with the thermoplastic resin deteriorates.

As the monomer unit constituting the block B, 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-
Methyl-1,3-pentadiene, 1,3-hexadiene, 4,5-diethyl-1,3-octadiene, chloroprene and the like can be mentioned, but hydrogenated diene-based copolymers that can be industrially used and have excellent physical properties. To get coalesced, 1,3-
Butadiene, isoprene and 1,3-pentadiene are preferred, and 1,3-butadiene and isoprene are more preferred.

Examples of the monomer segment other than the conjugated diene compound include styrene, t-butylstyrene, α
-Methylstyrene, p-methylstyrene, divinylbenzene, 1,1-diphenylstyrene, N, N-diethyl-p-aminoethylstyrene, vinylpyridine and the like are mentioned, and styrene and α-methylstyrene are particularly preferable.

Block C is a polybutadiene block segment having a content of 1,2-vinyl bonds before hydrogenation of 30% by weight or less, preferably 20% by weight or less. When the 1,2-vinyl bond content of the block C exceeds 30% by weight, the resinous property is deteriorated, the obtained hydrogenated diene copolymer is soft, and when formed into pellets, adhesion between pellets easily occurs, In producing the composition of the present invention, handling such as blending is hindered.

The hydrogenated diene-based copolymer of the present invention is
Block structure is ABC, (AB) n-C, (C-
B-A) m-X (where n and m are integers of 2 or more, and X is
Linear or branched, represented by the coupling agent residue)
Of block copolymer. Weight in block copolymer
The content of the united block A is 35 to 90% by weight, preferably
Is 50 to 85% by weight, and if less than 35% by weight is thermoplastic
Of the composition obtained by blending with a hydrophilic resin
The balance of sex is poor. In addition, the thermoplastic resin
In case of polystyrene and polyphenylene ether
Peeling occurs when the resulting blend is injection molded
Molding appearance is inferior. On the other hand, if it exceeds 90% by weight, it will flow
And the moldability and appearance of the resulting composition are poor.
It

The content of the polymer block B is 5 to 60% by weight, preferably 10 to 60% by weight, and if it is less than 5% by weight, the effect of improving the impact resistance of the composition obtained by blending with the thermoplastic resin is improved. On the other hand, when it exceeds 60% by weight, the balance of transparency and rigidity of the obtained composition is poor.

The content of the polymer block C is 5 to 60% by weight, preferably 5 to 55% by weight, and when the content is less than 5% by weight, the hydrogenated diene copolymer obtained is soft and, when pelletized, pellets Adhesion between them is likely to occur, operations such as blending in producing the composition of the present invention,
It may interfere with handling. Further, the impact resistance and the molding appearance of the composition obtained by blending with the thermoplastic resin are deteriorated. On the other hand, if it exceeds 60% by weight, the effect of improving the transparency and processability of the composition obtained by blending with the thermoplastic resin decreases.

Further, the hydrogenated diene-based copolymer of the present invention has a number average molecular weight of 40,000 to 700,000, preferably 70,000 to 500,000, and a composition of less than 40,000 obtained by blending with a thermoplastic resin. The effect of improving the impact resistance of is reduced. On the other hand, when it exceeds 700,000, the fluidity is lowered and the moldability and appearance of the resulting composition are deteriorated. Further, 80% by weight or more of the double bond residue of the conjugated diene portion of the hydrogenated diene-based copolymer,
It is necessary that 90% by weight or more be hydrogenated. If it is less than 80% by weight, the weather resistance and heat resistance are insufficient.

The hydrogenated diene-based copolymer of the present invention is subjected to living anion polymerization in an organic solvent using an organic alkali metal compound as an initiator to obtain a block copolymer, and then hydrogenated to the block copolymer. It is obtained by performing (hydrogenation). As the organic solvent, hydrocarbon solvents such as pentane, hexane, heptane, cyclohexane and toluene are used. As the organic alkali metal compound that is a polymerization initiator, an organic lithium compound is preferable. Specific examples include n-butyllithium, sec-butyllithium, t-butyllithium, and the like, and the monomer 100
It is used in the range of 0.02 to 0.2 parts by weight per part by weight.

Further, the adjustment of the vinyl bond content of the conjugated diene compound in the block B and the block C is performed by using a Lewis base,
For example, ether, amine, etc., specifically, diethyl ether, tetrahydrofuran, propyl ether, butyl ether, higher ether, or polyethylene glycol ether derivative such as ethylene glycol dibutyl ether, diethylene glycol dimethyl ether, diethylene glycol dibutyl ether, triethylene glycol dimethyl ether, as an amine Is adjusted by using a tertiary amine such as tetramethylethylenediamine, pyridine or tributylamine together with the organic solvent.

Further, the polymerization reaction is usually -30 to 150.
It is performed in the range of ° C. Further, the polymerization may be carried out while controlling it at a constant temperature, or may be carried out at an elevated temperature without removing heat.

Any method may be used to form the block copolymer, but generally, the block C is first prepared by using an initiator such as the organic alkali metal compound in the organic solvent.
And then block B is polymerized. Further, it can be obtained by subsequently polymerizing block A.
At this time, it is not always necessary to clearly distinguish the boundaries of the blocks. The bond content of the vinyl aromatic compound in the block A is adjusted by the amount of the monomer supplied during the polymerization. Further, the number average molecular weight is adjusted by the addition amount of the polymerization initiator.

(A)-(B) -obtained in this way
A coupling agent is added to the block copolymer (C).
The polymer molecular chain represented by the following general formula
Even if the block copolymer is extended or branched
good. The block copolymer thus obtained has the general formula: [(C)-(B)-(A)]. It is represented by m−X. [In the formula, (A), (B), and (C) are as described above.
, M is an integer of 2 or more, X is a coupling agent residue
Show. ]

Examples of the coupling agent include divinylbenzene, tetrachlorosilane, methyldichlorosilane, butyltrichlorosilane, (dichloromethyl) trichlorosilane, (dichlorophenyl) trichlorosilane, 1,2-bis (trichlorosilyl) ethane and hexachloro. Examples thereof include disilane, tetrachlorotin, butyltrichlorotin, tetrachlorogermanium, 1,2-dibromoethane, tolylene diisocyanate, diethyl adipate, and epoxidized linseed oil.

Preferred block copolymers of the present invention
Ack structure is A-B-C, (C-B-A) mX.
Hydrogenated dihydrogenated block copolymer of this block structure
The ene-based copolymer is much more excellent in the intended effect of the present invention.
Has been.

The hydrogenated diene-based copolymer of the present invention is prepared by dissolving the block copolymer thus obtained in an inert solvent and subjecting it to hydrogenation under pressure of 20 to 150 ° C. and 1 to 100 kg / cm ^2. , Can be hydrogenated in the presence of a hydrogenation catalyst. As the inert solvent used for hydrogenation, hexane, heptane, cyclohexane, toluene, a hydrocarbon solvent such as ethylbenzene, or methyl ethyl ketone,
Examples include polar solvents such as ethyl acetate, ethyl ether, and tetrahydrofuran. Further, as the hydrogenation catalyst,
Dicyclopentadienyl titanium halide, nickel organic carboxylate, cobalt organic carboxylate and periodic table I to I
Examples thereof include a combination with a Group II organometallic compound, and a metal hydride such as nickel, platinum, palladium, or rhodium supported on a carrier such as carbon, silica, or diatomaceous earth. Further, hydrogenation with a hydride such as p-toluenesulfonyl hydrazide can be mentioned. The hydrogenation rate of the conjugated diene portion is adjusted by changing the hydrogenation catalyst, the amount of the hydrogenated compound added, the hydrogen pressure during the hydrogenation reaction, and the reaction time.

From the hydrogenated block copolymer solution,
The residue of the catalyst can be removed, a phenol-based or amine-based antioxidant can be added, and the hydrogenated diene-based copolymer can be easily isolated from the polymer solution. Isolation of the hydrogenated diene-based copolymer is carried out, for example, by adding acetone or alcohol to a hydrogenated block copolymer solution to cause precipitation, pouring the polymer solution into hot water with stirring, and adding a solvent. It can be performed by a method such as evaporation removal. To the hydrogenated diene-based copolymer of the present invention, conventional auxiliary additives such as antioxidants, heat stabilizers, ultraviolet absorbers, lubricants, colorants, flame retardants and the like can be added.

The hydrogenated diene copolymer of the present invention can be used as a composition with a thermoplastic resin. The composition is (I) the hydrogenated diene-based copolymer 99 to 1 part by weight, preferably 95 to 2 parts by weight, more preferably 90.
To 3 parts by weight, (II) thermoplastic resin 1 to 99 parts by weight, preferably 5 to 98 parts by weight, and more preferably 10 to 97 parts by weight.
The main component is parts by weight.

The thermoplastic resin used in the present invention is not particularly limited, but polyethylene, high molecular weight polyethylene, high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene (LLDP).
E), polypropylene, polybutene, polyisobutylene, high impact polystyrene (HIPS), polystyrene, polymethylstyrene, polymethylene, poly-4
-Non-polar thermoplastics such as methyl-pentene-1
And ABS resin, acrylic resin, polyacrylamide, polymethacrylamide, polyacrylic acid, polyacrylic acid alkyl ester such as polymethyl acrylate, polyethyl acrylate, polymethacrylic acid, polymethyl methacrylate, polyethyl methacrylate, etc. Polymethacrylic acid alkyl ester, polyacrylonitrile, polymethacrylonitrile, acetal resin, polyoxymethylene, chlorinated polyethylene, coumarone indene resin, cellulose, cellulose ester, cellulose ether, carboxymethyl cellulose, cellulose ether ester, fluororesin, polychloro Trifluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, nylon 11, nylon 12, nydon 6, nylon 6,1
0, nylon 6,12, nylon 6,6, nylon 4,
6 and other aliphatic polyamides, polyphenylene isophthalamide, polyphenylene terephthalamide and other aromatic polyamides, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyphenylene ether, polyphenylene sulfide, polysulfone, polyether sulfone, polysulfonamide, polyether ether ketone, polyamide Imide, polyarylate,
Examples include polar thermoplastic resins such as polycarbonate, polyvinyl alcohol, polyvinyl ester, polyvinyl acetate, polymethyl vinyl ether, polyisobutylene vinyl ether, polyvinyl chloride and polyvinylidene chloride. Preferred thermoplastic resins are polyethylene, polypropylene, polystyrene, polyamide, polyacetal, polyethylene terephthalate, polybutylene terephthalate, polyphenylene ether, polyphenylene sulfide, polysulfone and polycarbonate.

The hydrogenated diene-based copolymer of the present invention is
It is also possible to introduce at least one functional group into the hydrogenated diene-based copolymer to use as a modified hydrogenated diene-based copolymer. The method for introducing a functional group into the hydrogenated diene-based copolymer, for example, a compound having an acid anhydride group or a carboxyl group, specifically acrylic acid, methacrylic acid, ethacrylic acid, maleic acid, maleic anhydride, fumar Acid, itaconic acid, itaconic anhydride, hymic acid,
Α, β-unsaturated carboxylic acid such as anhydrous hymic acid, or an anhydride thereof, a compound having an epoxy group, specifically glycidyl (meth) acrylate, allyl glycidyl ether, vinyl glycidyl ether, and a compound having a hydroxy group, Specifically, from the group of hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, and a compound having an amino group, specifically, diethylaminomethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, vinylpyridine and the like. There may be mentioned a method of grafting 0.01 to 20 parts by weight of an unsaturated compound having at least one selected functional group per 100 parts by weight of a hydrogenated diene copolymer.

As a grafting method, Japanese Patent Publication No. 39-63
The method described in Japanese Patent Publication No. 84 can be used. That is, a hydrogenated diene-based copolymer may be used instead of the olefin rubber, and a compound having various functional groups may be mixed and heated in a solid state to cause a reaction.

The heating method may be either a method using a closed kneader or a method in which a heating reaction is continuously performed using an extruder or the like. At this time, in order to accelerate the reaction, a peroxide may be used in combination, and a stabilizer may be used if necessary.

The above-mentioned block copolymer before hydrogenation is also used.
Propylene is added to the end of the active block copolymer during the production process.
Renoxide, benzophenone, diacetone alcohol
, Carbon dioxide, dialkylaminobenzaldehyde,
4,4'-dialkylaminobenzophenone, N-methyl
Luoxazolidinone, tolylene diisocyanate, dif
Phenylmethane diisocyanate, carbon disulfide, tetraa
Lucoxysilane, alkyltriphenoxysilane, octa
Stop with compounds such as tamethylcyclotetrasiloxane
By this, -OH group, -COOH group, -NR₂Base,
-NHR group, -NCO group, -Si (OR) n groups (only
R is alkyl or aryl, n is an integer of 1 to 3.
is there. ) And other functional groups can be introduced.

In producing the composition of the present invention, the use of the hydrogenated diene copolymer and the modified hydrogenated diene copolymer is not particularly limited, but the thermoplastic resin used in the composition is not limited. May be distinguished by the type and purpose.
For example, in a composition with a nonpolar thermoplastic resin such as polypropylene or polyethylene, when a modified hydrogenated diene-based copolymer modified with an acid anhydride group, an -OH group or the like is used, coating strength, printing The effect of modifying the properties is enhanced. Further, in a composition with a thermoplastic resin having polarity such as polyamide, it is better to use a modified hydrogenated diene copolymer modified with an acid anhydride or the like to improve the impact resistance of the composition. It is further enhanced.

The hydrogenated diene-based copolymer and / or the modified hydrogenated diene-based copolymer (I) of the present invention can be added to a mixture of two or more thermoplastic resins, if necessary. For example, the hydrogenated diene-based copolymer of the present invention is preferably used as a compatibilizing agent for a mixture of an olefin-based polymer such as polyethylene and polypropylene and polystyrene, and a styrene-based polymer such as a styrene-acrylonitrile copolymer. Therefore, a composition having excellent mechanical strength can be obtained.

The above-mentioned composition comprising the (modified) hydrogenated diene-based copolymer of the present invention and the thermoplastic resin has a conventional auxiliary additive component such as an antioxidant, a heat stabilizer, an ultraviolet absorber,
Colorants, flame retardants and the like can be added.

In using the composition comprising the hydrogenated diene copolymer of the present invention and a thermoplastic resin, glass fiber, carbon fiber, metal fiber, glass beads, mica, calcium carbonate, potassium titanate whiskers, talc, Known fillers such as aramid fibers can be used alone or in combination. Further, in order to further soften the composition comprising the hydrogenated diene-based copolymer of the present invention and the thermoplastic resin,
An oil, a plasticizer, and a low molecular weight polymer can be added as a softening agent.

The method for producing the composition of the present invention is not particularly limited, and known methods can be used. For example, the composition of the present invention can be obtained by kneading the components with various extruders, Banbury mixers, kneaders, rolls and the like.

In producing a composition comprising the hydrogenated diene-based copolymer of the present invention and a polar thermoplastic resin having a functional group, the modified hydrogenated diene-based copolymer has excellent compatibility with the polar resin. Shown, when using a hydrogenated diene-based copolymer, during kneading with a polar resin, an acid anhydride group, a carboxy group, a hydroxy group, an amino group, an epoxy group, an oxazoline group, and a group of imide group An unsaturated compound having at least one functional group selected from the above, and a method of adding a peroxide if necessary, or an unsaturated compound having the functional group and a peroxide in advance in a hydrogenated diene copolymer. There are a method of blending the graft product obtained by adding an oxide and heat treatment with the polar resin, and a method of using another polymer having the functional group as a compatibilizer.

Examples of the polymer having the functional group include random, block and graft copolymers of the unsaturated compound having the functional group and another vinyl monomer copolymerizable therewith. Examples of this specific copolymer include styrene and styrene such as glycidyl methacrylate copolymer, styrene-maleic anhydride copolymer, styrene-methacrylic acid copolymer, and styrene-acrylonitrile-methacrylic acid copolymer. It is a copolymer with the functional group-containing unsaturated compound and, if necessary, one or more other vinyl monomers copolymerizable therewith.

Examples of the other functional group-containing copolymers include ethylene and the functional group-containing unsaturated compound described above, such as ethylene-glycidyl methacrylate copolymer and ethylene-glycidyl methacrylate-vinyl acetate copolymer. Correspondingly, it is a copolymer with one or more other vinyl monomers copolymerizable therewith, and further includes those obtained by graft-reacting these ethylene copolymers with other polymers.

Examples of the other polymer subjected to the graft reaction include poly (meth) acrylic acid alkyl ester,
Polystyrene, styrene-acrylonitrile copolymer,
There are polymers obtained by polymerizing radically polymerizable vinyl monomers such as styrene- (meth) acrylic acid alkyl ester copolymers, and also those obtained by copolymerizing these with the functional group-containing unsaturated compound. Be done.

Further, as the copolymer as the compatibilizer, a copolymer of butadiene and the functional-containing unsaturated compound and, if necessary, another vinyl monomer copolymerizable therewith and its hydrogenation There are also the above-mentioned graft products.

In addition to the compatibilizing agent, the composition of the hydrogenated diene copolymer and the thermoplastic polar resin of the present invention is added.
Other rubbery polymers can also be used in combination. Examples of this rubbery polymer include polybutadiene and acrylonitrile-
Butadiene copolymer and / or hydrogenated product thereof, ethylene-α-olefin copolymer, ethylene-α-olefin-polyene copolymer, polyacrylic acid ester, styrene-butadiene block copolymer, hydrogenated styrene-
There are butadiene block copolymers, styrene-grafted ethylene-propylene elastomers, ethylene ionomers, and the like, and these are used alone or in combination of two or more. The styrene-butadiene block copolymer includes ABA type, ABA taper type, radial teleblock type and the like.

Further, the hydrogenated diene copolymer of the present invention and the thermoplastic resin can be partially crosslinked. The method of partial cross-linking is not particularly limited, but generally, using a Banbury type kneader, a kneader type kneader, or a single-screw or twin-screw extruder, the (modified) hydrogenated diene copolymer and the 0.00 per 100 parts by weight of a composition comprising a plastic resin
100 to 300 in the presence of 1 to 0.5 parts by weight of peroxide.
React by heating to ℃.

The composition comprising the hydrogenated diene copolymer (modified hydrogenated diene copolymer) of the present invention and a thermoplastic resin is used as various molded articles by injection molding, extrusion molding, vacuum molding or the like. As its applications, it can be widely used for interior / exterior parts of automobiles, various electric / electronic parts, housings, industrial parts, stationery, sporting goods, medical materials, film / sheet products and the like.

[0044]

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples as long as the gist of the present invention is not exceeded. In the examples, parts and% are based on weight unless otherwise specified. In addition, various measurements in the examples were performed by the following methods. The bound vinyl aromatic content was measured by infrared analysis based on the absorption of the phenyl group at 679 cm ^-1 . The vinyl bond content of the conjugated diene was calculated by the Hampton method using an infrared analysis method. The hydrogenation rate of the conjugated diene was calculated from 100 MHz · ¹ H-NMR spectrum using ethylene tetrachloride as a solvent. The molecular weight was determined in terms of polystyrene by using gel permeation chromatography (GPC) at 135 ° C. using trichlorobenzene as a solvent. Melt flow rate (MFR) is JIS K7
230 ° C, load 2.16kg or 1 according to 210
It was measured at 2.5 kg.

The pellet blocking test is 55 m.
Round pellets were prepared using mφ, uniaxial extruder and hot cutter, and the load was 30 kg / c in a constant temperature bath at 60 ° C.
Based on how the pellets clumped after m ² and 72 hours, they were ranked as follows. ◯: Hardly solidified and easily disassembled. Δ: A little hardened, but can be loosened relatively easily. X: Hardened and difficult to loosen. The IZOD impact value was measured according to JIS K7110. The flexural modulus was measured according to JIS K7203. The peel strength of the coating film is the thickness of 2 obtained by injection molding.
After degreasing the mm sheet with ethanol, it is surface-treated with trichloroethane vapor and coated with a primer [RB291H manufactured by Nippon Bee Chemical Co., Ltd.], and then a polyurethane coating [R263 manufactured by Nippon Bee Chemical Co., Ltd.]. Was applied in a dry coating film thickness of about 50 μm, and after curing, the coating film was peeled by 180 ° at a pulling speed of 30 mm / min, and the peel strength was measured.
Transparency was measured according to ASTM D1003. The DuPont impact value was measured with reference to JIS K7211. The tensile strength was measured according to JIS K7127.

Example 1 A 10-liter autoclave was charged with 5 kg of degassed and dehydrated cyclohexane and 150 g of 1,3-butadiene, 0.25 g of tetrahydrofuran and 0.9 g of n-butyllithium were added, and the polymerization temperature was 80 ° C. A constant isothermal polymerization was performed. After the conversion rate became almost 100%, the reaction solution was cooled to 10 ° C., and 100 g of tetrahydrofuran was added.
Adiabatic polymerization was carried out by adding 350 g of butadiene. Then, 500 g of styrene was added and the adiabatic polymerization was continued. After the polymerization was completed, 0.15 g of water was added and stirred for 20 minutes. It was confirmed from the change in color of the polymer liquid that there was no polymer-terminated lithium as a living anion. Next, 2.74 g of benzophenone dissolved in 20 ml of cyclohexane and 0.92 g of n-butyllithium were preliminarily reacted for 20 minutes in a nitrogen atmosphere, and the reaction product was charged. 1.23 g of diethylaluminum chloride dissolved in 34 g and 10 ml of toluene,
The components mixed in advance under a nitrogen atmosphere were placed in an autoclave and stirred. Hydrogen gas was supplied at a pressure of 8 kg / cm ² G and the reaction was carried out at 90 ° C. for 2.5 hours.

The hydrogenation rate of the obtained hydrogenated polymer was 99%,
Number average molecular weight 150,000, MFR (230 ° C, 2.16k
g) was 1.3 g / 10 min. In addition, the 1,2-butadiene bond content of the 1,3-butadiene block measured at the end of the first-stage 1,3-butadiene block polymerization was 14%, and the polymerization of the second-stage 1,3-butadiene block was 14%. As a result of calculation from the 1,2-vinyl bond content measured at the end and the 1,2-vinyl bond content in the first step, 1,2-butadiene block in the second step
The vinyl bond content was 78%. This hydrogenated diene-based copolymer is referred to as "H-1". H-1 obtained here is
Pellets were produced with a 20 mmφ uniaxial extruder and the blocking properties of the pellets were measured. As a result, the pellet was not blocked and was in a state where it could be easily loosened. The results are shown in Table 1.

Examples 2 to 6 By the same method as in Example 1, the monomer species, the amount of monomer, the amount of catalyst, the polymerization temperature and the polymerization time were adjusted so that the hydrogenated diene copolymers shown in Tables 1 and 2 were obtained. It was prepared by varying the amount. Example 1 using these hydrogenated diene-based copolymers
The blocking test of the pellet was performed by the same method as described in (1). The results are shown in Tables 1 and 2.

Example 7 A block copolymer was polymerized in the same manner as in Example 1 except that 0.85 g of n-butyllithium was used. When 100% of all monomers were polymerized, methyldichlorosilane 0 was added. 0.45g was added and reacted for about 30 minutes. At this point 95% of the block copolymer has been coupled,
An increase in molecular weight was observed. The increased molecular weight was about twice as high as that before the addition of the coupling agent, and the coupled copolymer was mainly composed of the coupling agent residue and the block copolymer was 2 units.
It is in the form of individual bonds (H-7). After that, a pellet blocking test was carried out in the same manner as in Example 1. The results are shown in Table 2.

Example 8 A block copolymer was polymerized in the same manner as in Example 1 except that 1.2 g of n-butyllithium was used. When 100% of all monomers were polymerized, tetrachlorosilicon was used. 0.56g was added and it reacted for about 10 minutes. At this point, 94% of the block copolymer was coupled and an increase in the molecular weight was observed. The increased molecular weight was about 3.8 times that before the addition of the coupling agent, and the coupled copolymer was in a form in which four block copolymers were bonded around the coupling agent residue ( H-8). After that, a pellet blocking test was carried out in the same manner as in Example 1. The results are shown in Table 2.

Comparative Examples 1 to 10 In the same manner as in Example 1, K-1 to K shown in Tables 3 and 4 were used.
The amount of monomers, the amount of catalyst, and the polymerization temperature were varied so that the hydrogenated diene-based copolymer of -10 was obtained. Using these hydrogenated diene-based copolymers, a pellet blocking test was conducted in the same manner as in Example 1. The results are shown in Tables 3 and 4. As can be seen from Tables 3 and 4, the hydrogenated diene-based copolymers of Comparative Examples 1, 3, and 8 showed pellet blocking, and Comparative Examples 2 and 9 did not cause pellet blocking, but Comparative Example 11 As shown below, the blending with other resins is not preferable because the modification effect is inferior to that of the hydrogenated diene-based copolymers of the examples.

Examples 9 to 16 Production of composition with non-polar thermoplastic resin H-1 to H-8 obtained in Examples 1 to 8 and polypropylene resin: PP-1 [manufactured by Mitsubishi Petrochemical Co., Ltd.] , BC-03]
Using a 4 liter Banbury kneader
Mixed in a weight ratio of 75. The mixed composition was formed into a sheet and then cut into square pellets, and the following evaluation was performed.

Physical Properties of Injection Molded Product A test piece was prepared from the composition obtained above using a 6.5 oz. In-line screw type injection molding machine. The injection molding conditions are shown below. Injection pressure: 500 kg / cm ² (Secondary pressure: 400 kg / c
m ² ) Molding temperature: 240 ° C. Cooling temperature: 40 ° C. Each physical property was measured using the obtained test piece. The measurement results are shown in Tables 5 and 6.

Physical Properties of Sheet Molded Products Hydrogenated diene-based copolymer pellets obtained in Examples 1 to 8 and polypropylene resin: PP-2 [manufactured by Chisso Petrochemical Co., Ltd., XF1800] were prepared in the same manner as above. After blending in a weight ratio of 10/90 with to obtain pellets, 2
0 mmφ extruder-using a 150 mm T die, 0.5
A mm-thick sheet was produced. In the sheet forming, the sheet thickness was adjusted with two mirror-finished rolls. The roll temperature was adjusted to 50 ° C. The physical properties of the obtained sheet are shown in Tables 5 and 6.

Comparative Examples 11 to 20 In the same manner as in Example 9, K-1 to K shown in Tables 3 and 4 were used.
Injection-molded products and sheet-molded products were produced using the hydrogenated diene-based copolymer of -10, and each physical property was measured. The results are shown in Table 7,
8 shows. From the above comparative examples, any composition using the hydrogenated diene-based copolymer that does not satisfy the requirements of the present invention results in lacking any of the specific properties of the present invention.

Comparative Examples 21 to 23 In Example 9, ethylene-propylene copolymer [Nippon Synthetic Rubber Co., Ltd.] was used instead of the hydrogenated diene copolymer.
Manufactured by EP02P], ethylene-butene-1 copolymer [manufactured by Nippon Synthetic Rubber Co., Ltd., EBM2041P], hydrogenated triblock copolymer manufactured by Shell Co., Creton G165.
0: SEBS] was used to obtain a composition pellet with polypropylene resin-1 by the same method. Subsequently, an injection-molded article was produced in the same manner as in Example 9, and the physical properties were measured. The results are shown in Table 8. From these comparisons, the hydrogenated diene-based copolymer of the present invention was used as compared with the conventionally used ethylene-propylene copolymer, ethylene-butene-1 copolymer, or hydrogenated triblock copolymer. It can be seen that the composition has an excellent balance of processability, transparency, rigidity and coatability.

Comparative Example 24 The physical properties of the thermoplastic resin alone were measured. The results are shown in Table 8.

Example 17 and Comparative Example 25 A 70/30 blend of polystyrene (Mitsui Toatsu, Topolex 525), which is a thermoplastic resin having an aromatic ring, and a hydrogenated block copolymer H-5 (Example 17). ) And a 70/30 blend of hydrogenated block copolymer K-3 (Comparative Example 25) were injection-molded, and the molding appearance is the same as in Example 2.
1 was good, but Comparative Example 25 was inferior such as surface peeling.

[0059]

[Table 1]

[0060]

[Table 2]

[0061]

[Table 3]

[0062]

[Table 4]

[0063]

[Table 5]

[0064]

[Table 6]

[0065]

[Table 7]

[0066]

[Table 8]

[0067]

INDUSTRIAL APPLICABILITY The present invention is a hydrogenated diene-based copolymer obtained by hydrogenating a specific block copolymer, and a composition comprising this and a thermoplastic resin is compared with a conventional composition. The hydrogenated diene-based copolymer composition is excellent in balance of heat resistance, processability, transparency, rigidity, and molding appearance. Further, this hydrogenated diene-based copolymer is easy to pelletize,
The pellets have improved blocking resistance and, when used in a blend with a thermoplastic resin, exhibit the above-mentioned excellent properties.

Front page continued (72) Inventor Yasuhiko Takemura 2-11-24 Tsukiji, Chuo-ku, Tokyo Japan Synthetic Rubber Co., Ltd.

Claims (2)

[Claims] 1. Polymer blocks A, B and C in the molecule.
(Where A is 80% by weight of vinyl aromatic compound)
% Of the polymer block segment, B is a conjugated diblock
Containing 70% by weight or more of ene compound and conjugated diene conversion
A vinyl polymer having a vinyl bond content of 70% by weight or more
Lock segment, C is 30 weight of 1,2-vinyl bond
% Polybutadiene block segment
It ), And the block structure is ABC, (AB) n
-C, (C-B-A) m-X (however, n and m are 2 or more
And X is a coupling agent residue. )
A linear or branched block copolymer,
The content of the polymer block A is 35 to 90% by weight, and the polymer block
Content of lock B is 5 to 60% by weight, polymer block C
Content of 5 to 60% by weight (however, A + B + C = 10
0% by weight) and the number average molecular weight of the block copolymer
Is 4 to 700,000, and the olefin in the block copolymer is
Hydrogenated diene prepared by hydrogenating 80% or more of the unsaturated bond
-Based copolymer. 2. A hydrogenated diene-based copolymer obtained by modifying the hydrogenated diene-based copolymer according to claim 1 with at least one functional group.