JP2011002586A - Sound insulating member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound insulating member that solves a problem on an environment and resource conservation and has characteristics suitable for a sound insulating member having transparency.SOLUTION: The sound insulating member is made of polycarbonate resin containing structural unit originating in dihydroxy compound expressed by general formula (1).

Description

  The present invention relates to a sound insulating member made of polycarbonate resin, more specifically, made of polycarbonate resin containing isosorbide which is a biomass resource, has transparency, high glass transition temperature, high surface hardness, less discoloration due to ultraviolet rays, The present invention relates to a sound insulation member having a shape such as a sheet, a plate, or a film having good mechanical strength.

  A plastic sheet has a low specific gravity and is easily used for various purposes such as forming by melt molding, and cutting and cutting. In particular, as a sound insulation member having transparency, it is used in various fields such as daily necessities, transportation related, industrial supplies, and civil engineering industries. Specific examples include arcade ceiling sheets and plates, sound insulation walls such as roads, facility roofing materials, and in the housing equipment field, terrace seats, housing interior materials (such as various partitions), and the like. Conventionally, polyvinyl chloride resins, polyacrylate resins, polycarbonate resins, and the like have been used for these applications requiring transparency. Here, since the polyvinyl chloride resin may generate dioxins at the time of waste incineration, it is not preferable for the environment, and its use has decreased recently.

  In the sound insulation member, the denser the material and the greater the weight per unit area, the greater the sound insulation effect (transmission loss). Therefore, common examples of sound insulation materials include concrete, iron plate, stone, etc. As a sound insulation member that requires transparency, polycarbonate resin is excellent in transparency and has a specific gravity of 1.2, which is a normal polymer. Among them, since it belongs to a large class, the sound insulation property is also good, and the amount of use has increased in recent years.

  On the other hand, in the applications where the above-described transparency is required, the dimension as a member is large, so that depending on the use environment, dimensional stability against changes in the use environment temperature is required, and it is applicable to a wide range of uses. Therefore, the heat resistance of the sheet, for example, the glass transition temperature (Tg) is an important factor. From this point, in the amorphous resin, if the glass transition temperature (Tg) of the resin is high, for example, 80 ° C. or higher, more preferably 100 ° C. or higher, the dimensional change can be suppressed in a considerable temperature range. Since the glass transition temperature of polyacrylate resin is 80-90 degreeC, there is a restriction | limiting in the application used. Since the glass transition temperature of the polycarbonate resin is 130 to 150 ° C., it can be applied to most of the sound insulating members from the viewpoint of heat resistance.

  Furthermore, it is desirable that the sound insulating member has ultraviolet (UV) resistance, high surface hardness, good tensile strength, high optical transparency, good impact strength, and flame retardancy. Polyacrylate resin has little discoloration due to ultraviolet rays, high surface hardness, and good transparency, but has a problem that mechanical strength is slightly inferior, and flame retardancy does not reach the self-extinguishing class. There is. On the other hand, the polycarbonate resin is excellent in mechanical strength and self-extinguishing, but has a problem that the discoloration due to ultraviolet rays is large and the surface hardness is low. The low surface hardness means that when used outdoors, the surface of the sheet is scraped by flying sand during use, resulting in a decrease in transparency and, in severe cases, a decrease in mechanical strength. This is an important characteristic for use as a sound insulation member.

  By the way, polyvinyl chloride resin, polyacrylate resin, polycarbonate resin and the like are generally manufactured using raw materials derived from petroleum resources. However, in recent years, there is a concern about the depletion of petroleum resources, and provision of materials from plastics using raw materials obtained from biomass resources such as plants is required. In addition, since there is a concern that global warming due to the increase and accumulation of carbon dioxide emissions will lead to climate change, etc., plastics made from plant-derived monomers that are carbon neutral in disposal after use Development of materials from is required.

  Conventionally, it has been proposed to obtain a polycarbonate resin by transesterification with diphenyl carbonate using isosorbide as a plant-derived monomer (see, for example, Patent Document 1). However, the obtained polycarbonate resin is brown and is not satisfactory. Further, as a copolymer polycarbonate resin of isosorbide and another dihydroxy compound, a polycarbonate resin obtained by copolymerizing an aromatic dihydroxy compound bisphenol A has been proposed (see, for example, Patent Document 2). Furthermore, isosorbide and aliphatic dihydroxy are proposed. Attempts have been made to improve the rigidity of a homopolycarbonate resin made of isosorbide by copolymerizing with a compound (see, for example, Patent Document 3).

  On the other hand, many polycarbonates obtained by polymerizing 1,4-cyclohexanedimethanol which is an alicyclic dihydroxy compound have been proposed (for example, Patent Documents 4 and 5), but the molecular weight of these polycarbonate resins is at most 4,000. For this reason, many have a low glass transition temperature.

  In this way, polycarbonate resins using isosorbide have been proposed, but these documents disclose only glass transition temperature and further basic mechanical properties, and are important for the above-mentioned sound insulation member. Such characteristics as surface hardness are not disclosed.

British Patent No. 1079686 JP-A-56-55425 International Publication No. 04/111106 Pamphlet JP-A-6-145336 Japanese Patent Publication No. 63-12896

  As described above, polyvinyl chloride resin, polyacrylate resin, and polycarbonate resin, which are currently widely used in sound insulation member applications having transparency, have some problems in terms of the properties for the application, and more Even in the construction of a good future society, there are problems from the viewpoint of environmental and oil resource conservation. Accordingly, the present invention has been made for the purpose of providing a sound insulation member having characteristics suitable for a sound insulation member having transparency, while solving problems in environmental and resource conservation.

  In view of the above problems, the present inventors have found that a polycarbonate resin using isosorbide which is a plant-derived monomer as a dihydroxy compound has high surface hardness, low weather discoloration, and self-extinguishing properties. The inventors have found that these characteristics match those required for the sound insulation member, and have completed the invention. Furthermore, it has been found that a polycarbonate copolymer obtained by copolymerizing an alicyclic dihydroxy compound has a good balance between glass transition temperature and impact resistance and can be applied to a wide range of sound insulating members.

  That is, the gist of the present invention resides in a sound insulating member made of a polycarbonate resin containing a structural unit derived from a dihydroxy compound represented by the following general formula (1).

  The sound insulation member made of the polycarbonate resin of the present invention using a plant-derived monomer not only solves environmental and petroleum resource conservation problems, but also has good transparency, high surface altitude, and weather discoloration resistance. Small, self-extinguishing, good balance between glass transition temperature and impact strength, so that we can solve environmental and resource conservation problems and provide sound insulation members with characteristics suitable for sound insulation members with transparency can do.

  DESCRIPTION OF EMBODIMENTS Embodiments of the present invention will be described in detail below. However, the description of the constituent elements described below is an example (representative example) of an embodiment of the present invention. It is not limited to the contents.

  The polycarbonate resin in the present invention is characterized in that it contains a structural unit derived from a dihydroxy compound represented by the following general formula (1), and a part of the dihydroxy compound is replaced with another type of dihydroxy compound, for example, The copolymer may be a constituent unit derived from an aliphatic or aromatic dihydroxy compound, or a copolymer substituted with a copolymer constituent unit such as polyalkylene glycol.

  In the present invention, examples of the dihydroxy compound represented by the general formula (1) include isosorbide, isomannide and isoidet which are in a stereoisomeric relationship, and even if one of these is used alone, 2 More than one species may be used in combination.

  Among these dihydroxy compounds, isosorbide obtained by dehydrating condensation of sorbitol produced from various starches that are abundant as resources and are readily available is easy to obtain and manufacture, optical properties, moldability From the viewpoint of

  In addition, since isosorbide is easily oxidized by oxygen, in order to prevent decomposition due to oxygen during storage and handling during production, water should not be mixed in, oxygen scavengers may be used, nitrogen atmosphere It is important to set it down. When isosorbide is oxidized, decomposition products such as formic acid are generated. For example, when a polycarbonate resin is produced using isosorbide containing these decomposition products, the resulting polycarbonate resin is colored or causes a significant deterioration in physical properties. In addition, the polymerization reaction may be affected, and a high molecular weight polymer may not be obtained. Even if a stabilizer that prevents the generation of formic acid is added, depending on the type of stabilizer, the resulting polycarbonate resin may be colored or the physical properties may be significantly degraded. . As the stabilizer, a reducing agent or an antacid is used. Among them, examples of the reducing agent include sodium borohydride and lithium borohydride. Examples of the antacid include alkalis such as sodium hydroxide. Addition of such an alkali metal salt also serves as a polymerization catalyst, and if it is excessively added, the polymerization reaction may not be controlled.

  In order to obtain isosorbide containing no oxidative decomposition product, isosorbide may be distilled as necessary. Moreover, also when the stabilizer is mix | blended in order to prevent the oxidation and decomposition | disassembly of isosorbide, you may distill isosorbide as needed. In this case, the distillation of isosorbide may be simple distillation or continuous distillation, and is not particularly limited. After the atmosphere is an inert gas atmosphere such as argon or nitrogen, distillation is performed under reduced pressure. As the isosorbide in the present invention, it is preferable to use a high-purity isosorbide having a formic acid content of less than 20 ppm, further 10 ppm or less, particularly 5 ppm or less by performing such distillation.

  On the other hand, the dihydroxy compound of the copolymer structural unit other than the isosorbate of the polycarbonate resin in the present invention may be any of linear aliphatic, cycloaliphatic, and aromatic dihydroxy compounds. Examples of linear aliphatic dihydroxy compounds include 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 2 -Ethyl 1,6-hexanediol, 2,2,4-trimethyl-1,6-hexanediol, 1,10-decanediol, hydrogenated dilinoleyl glycol, hydrogenated dioleyl glycol and the like.

  Examples of the cycloaliphatic (alicyclic) dihydroxy compounds that can be used in the present invention include 1,2-cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol, 2-methyl-1, Hexanediols such as 4-cyclohexanediol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 2,3-norbornanedimethanol, 2,5-norbornanedimethanol, etc. Norbornane dimethanol, tricyclodecane dimethanol, pentacyclopentadecane dimethanol, 1,3-adamantanediol, 2,2-adamantanediol, and the like. Of these, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, and 1,4-cyclohexanedimethanol are preferred.

Examples of aromatic dihydroxy compounds that can be used in the present invention include bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) propane, 2 , 2-bis (4-hydroxyphenyl) propane, 1,1-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) butane, 1,1-bis (4-hydroxyphenyl) pentane 2,2-bis (4-hydroxyphenyl) pentane, 3,3-bis (4-hydroxyphenyl) pentane, 2,2-bis (4-hydroxyphenyl) -3-methylbutane, 1,1-bis (4 -Hydroxyphenyl) hexane, 2,2-bis (4-hydroxyphenyl) hexane, 3,3-bis (4-hydroxyphenyl) he Aromatic rings such as sun, 2,2-bis (4-hydroxyphenyl) -4-methylpentane, 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydroxyphenyl) cyclohexane Bisphenol compounds having no substituents thereon; bis (3-phenyl-4-hydroxyphenyl) methane, 1,1-bis (3-phenyl-4-hydroxyphenyl) ethane, 1,1-bis (3-phenyl- Bisphenol compounds having an aryl group as a substituent on an aromatic ring such as 4-hydroxyphenyl) propane and 2,2-bis (3-phenyl-4-hydroxyphenyl) propane; bis (4-hydroxy-3-methylphenyl) ) Methane, 1,1-bis (4-hydroxy-3-methylphenyl) ethane, 1,1-bis (4-hydroxy) 3-methylphenyl) propane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 1,1-bis (4-hydroxy-3-methylphenyl) cyclohexane, bis (4-hydroxy-3-ethyl) Phenyl) methane, 1,1-bis (4-hydroxy-3-ethylphenyl) ethane, 1,1-bis (4-hydroxy-3-ethylphenyl) propane, 2,2-bis (4-hydroxy-3-) Ethylphenyl) propane, 1,1-bis (4-hydroxy-3-ethylphenyl) cyclohexane, 2,2-bis (4-hydroxy-3-isopropylphenyl) propane, 2,2-bis (4-hydroxy-3) -(Sec-butyl) phenyl) propane, bis (4-hydroxy-3,5-dimethylphenyl) methane, 1,1-bis (4-hydride) Loxy-3,5-dimethylphenyl) ethane, 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 1,1-bis (4-hydroxy-3,5-dimethylphenyl) cyclohexane, bis (4-hydroxy-3,6-dimethylphenyl) methane, 1,1-bis (4-hydroxy-3,6-dimethylphenyl) ethane, 2,2-bis (4-hydroxy-3,6-dimethylphenyl) Propane, bis (4-hydroxy-2,3,5-trimethylphenyl) methane, 1,1-bis (4-hydroxy-2,3,5-trimethylphenyl) ethane, 2,2-bis (4-hydroxy-) 2,3,5-trimethylphenyl) propane, bis (4-hydroxy-2,3,5-trimethylphenyl) phenylmethane, 1,1-bis (4-hydroxy) 2,3,5-trimethylphenyl) phenyl ethane, 1,1-bis (4-hydroxy-2,3,5-bisphenol compound having an alkyl group as a substituent on the aromatic ring such as trimethylphenyl) cyclohexane;
Bis (4-hydroxyphenyl) phenylmethane, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, 1,1-bis (4-hydroxyphenyl) -1-phenylpropane, bis (4-hydroxyphenyl) ) Bisphenol compounds in which a divalent group connecting aromatic rings such as diphenylmethane and bis (4-hydroxyphenyl) dibenzylmethane has an aryl group as a substituent; 4,4′-dihydroxydiphenyl ether, 3,3 ′, 5, Bisphenol compounds in which aromatic rings such as 5′-tetramethyl-4,4′-dihydroxydiphenyl ether are linked by an ether bond; 4,4′-dihydroxydiphenylsulfone, 3,3 ′, 5,5′-tetramethyl-4 , 4'-dihydroxydiphenylsulfone and other aromatic rings linked by sulfone bonds A bisphenol compound in which aromatic rings such as 4,4′-dihydroxydiphenyl sulfide and 3,3 ′, 5,5′-tetramethyl-4,4′-dihydroxydiphenyl sulfide are connected by a sulfide bond. However, 2,2-bis (4-hydroxyphenyl) propane (hereinafter sometimes abbreviated as “bisphenol A”) may be mentioned.

  Moreover, as a polyalkylene glycol of a copolymerization structural unit, what contains 2-40 C2-C4 alkoxyl groups per molecule is preferable, for example, polyethylene glycol, polypropylene glycol, etc. can be mentioned.

  One type of these hydroxy compounds as copolymerization units may be used alone, or two or more types may be used as a mixture. When a linear aliphatic dihydroxy compound or polyalkylene glycol is used as a copolymerization component, the glass transition temperature as a polycarbonate resin is drastically lowered, and the use as a sound insulating member is restricted, which is not preferable. In general, it is difficult to obtain a high molecular weight polycarbonate resin in which the dihydroxy compound represented by the general formula (1) is used alone. On the other hand, a copolymer with a dihydroxy compound having a cyclic structure is easy to obtain a relatively high molecular weight, and in particular, a cycloaliphatic (alicyclic) dihydroxy compound is used as a copolymerization component. In this case, the reactivity balance between the dihydroxy compound represented by the general formula (1) and the alicyclic dihydroxy compound is good, the molecular weight is relatively easy, and the glass transition temperature is also lowered linearly. It is desirable in that it is less than an aliphatic dihydroxy compound and has sufficiently high surface hardness and mechanical strength. Even when an aromatic dihydroxy compound is used as a copolymerization component, it is easy to obtain a relatively high molecular weight compound, and the glass transition temperature is lowered to a smaller extent than that of a linear aliphatic dihydroxy compound. It is desirable in that the surface hardness and mechanical strength are sufficiently high.

  Details of the polycarbonate resin obtained by copolymerizing the structural unit derived from the dihydroxy compound represented by the general formula (1) and the structural unit derived from the dihydroxy compound having a cyclic structure will be described below. Copolymers are basically similar, and can be produced with reference to the above-mentioned patent documents.

  About the content rate of the structural unit derived from the dihydroxy compound represented by General formula (1), and the structural unit derived from an alicyclic dihydroxy compound, it can select in arbitrary ratios. However, when differential scanning calorimetry (DSC) is performed, a single glass transition temperature is given, but the polycarbonate resin in the present invention is a kind of dihydroxy compound and alicyclic dihydroxy compound represented by the general formula (1). By adjusting the mixing ratio, the glass transition temperature can be obtained as a copolymer having an arbitrary glass transition temperature from about 45 ° C. to about 155 ° C. depending on the application.

  Therefore, for the sound insulation member of the present invention, by setting the glass transition temperature to 80 ° C. or higher, heat resistance (usable temperature) of 70 ° C. or higher can be secured, so the dihydroxy compound represented by the general formula (1) It is necessary to appropriately select the ratio of the structural unit derived from the structural unit derived from the alicyclic dihydroxy compound. The ratio is preferably 99: 1 to 30:70 (mol%), more preferably 90:10 to 40:60 (mol%), and particularly 85:15 to 45:55 (mol). %). If the number of structural units derived from the dihydroxy compound represented by the general formula (1) is larger than the above range and the number of structural units derived from the alicyclic dihydroxy compound is small, coloring tends to occur, and conversely the general formula (1). When the number of structural units derived from the dihydroxy compound is small and the number of structural units derived from the alicyclic dihydroxy compound is large, the molecular weight is difficult to increase and the glass transition temperature tends to decrease.

  Furthermore, about the content rate of the structural unit derived from the dihydroxy compound represented by General formula (1), and the structural unit derived from an aromatic dihydroxy compound, it can select in arbitrary ratios.

  For the sound insulation member of the present invention, the ratio of the structural unit derived from the aromatic dihydroxy compound is 5 mol% or more based on the total dihydroxy compound in that heat resistance (usable temperature) can be increased. In particular, it is preferably 10 mol% or more, and more preferably 15 mol% or more. In addition, the sound-insulating member having transparency is desired to be used in a place exposed to light from the property of transmitting light, and it is mentioned that it is excellent in light resistance, but sufficient light resistance can be obtained. The ratio of the structural units derived from the aromatic dihydroxy compound is preferably 40 mol% or less, more preferably 35 mol% or less, particularly 30 mol% or less, based on the total dihydroxy compound. Preferably there is. If the number of structural units derived from the aromatic dihydroxy compound is less than the above range, the glass transition temperature may be lowered, resulting in poor heat resistance. If the number of structural units derived from the aromatic dihydroxy compound is increased, light resistance is increased. There is a risk that the durability when exposed to light is lowered.

  The degree of polymerization of the polycarbonate resin in the present invention is precisely determined by using a mixed solvent of phenol and 1,1,2,2, -tetrachloroethane in a weight ratio of 1: 1 as a solvent and a polycarbonate concentration of 1.00 g / dl. The adjusted reduced viscosity measured at a temperature of 30.0 ° C. ± 0.1 ° C. (hereinafter sometimes simply referred to as “reduced viscosity”) is preferably 0.40 dl / g or more, particularly preferably 0.8. The degree of polymerization is preferably 40 dl / g or more and 2.0 dl / g or less. When the reduced viscosity of the polycarbonate resin is extremely low, the mechanical strength as a sound insulation member is weak, whereas when the reduced viscosity of the polycarbonate resin is too large, the fluidity during molding is lowered and the cycle characteristics are lowered. Therefore, there is a tendency that the distortion of the molded product increases and is easily deformed by heat. Accordingly, the reduced viscosity of the polycarbonate resin in the present invention is preferably 0.40 dl / g or more and 2.0 dl / g or less, and particularly preferably in the range of 0.45 dl / g or more and 1.5 dl / g or less. preferable.

  The polycarbonate resin in the present invention preferably has a density of 1.30 g / cm 3 or more, particularly preferably 1.32 g / cm 3 or more.

  The polycarbonate resin in the present invention can be produced by a generally used polymerization method, and the polymerization method may be either a solution polymerization method using phosgene or a melt polymerization method in which it reacts with a carbonic acid diester. In the presence of, a melt polymerization method in which a dihydroxy compound is reacted with a diester carbonate having lower toxicity to the environment is preferred.

  Examples of the carbonic acid diester used in the melt polymerization method include those represented by the following general formula (2).

(In General Formula (2), A and A ′ are each an optionally substituted aliphatic hydrocarbon group having 1 to 18 carbon atoms or an optionally substituted aromatic hydrocarbon group. And A and A ′ may be the same or different.)
註 13; I joined.

  Examples of the carbonic acid diester represented by the general formula (2) include diphenyl carbonate, substituted diphenyl carbonate typified by ditolyl carbonate, dimethyl carbonate, diethyl carbonate, and di-t-butyl carbonate. Particularly preferred are diphenyl carbonate and substituted diphenyl carbonate. These carbonic acid diesters may be used alone or in a mixture of two or more.

  The carbonic acid diester is preferably used in a molar ratio of 0.96 to 1.10 with respect to the dihydroxy compound, and particularly preferably in a molar ratio of 0.98 to 1.04. When this molar ratio is less than 0.96, the terminal hydroxyl group of the produced polycarbonate resin is increased, and the thermal stability of the polymer is deteriorated. When the molar ratio is larger than 1.10, under the same conditions, The rate of the transesterification reaction is reduced, making it difficult to produce a polycarbonate resin having a desired molecular weight, and the amount of residual carbonic acid diester in the produced polycarbonate resin is increased. This is not preferable because it causes odor of the molded product.

  In addition, as a polymerization catalyst (transesterification catalyst) in melt polymerization, one or more of alkali metal compounds and / or alkaline earth metal compounds are used. One or more basic compounds such as a basic boron compound, a basic phosphorus compound, a basic ammonium compound, and an amine compound may be used in combination with an alkali metal compound and / or an alkaline earth metal compound. However, it is particularly preferred that only alkali metal compounds and / or alkaline earth metal compounds are used.

  Examples of the alkali metal compound used as the polymerization catalyst include sodium hydroxide, potassium hydroxide, lithium hydroxide, cesium hydroxide, sodium hydrogen carbonate, potassium hydrogen carbonate, lithium hydrogen carbonate, cesium hydrogen carbonate, sodium carbonate, potassium carbonate. , Lithium carbonate, cesium carbonate, sodium acetate, potassium acetate, lithium acetate, cesium acetate, sodium stearate, potassium stearate, lithium stearate, cesium stearate, sodium borohydride, potassium borohydride, lithium borohydride, Cesium borohydride, sodium phenyl borohydride, potassium phenyl borohydride, lithium phenyl borohydride, cesium phenyl borohydride, sodium benzoate, potassium benzoate, lithium benzoate, benzoic acid Cium, 2 sodium hydrogen phosphate, 2 potassium hydrogen phosphate, 2 lithium hydrogen phosphate, 2 cesium hydrogen phosphate, 2 sodium phenyl phosphate, 2 potassium phenyl phosphate, 2 lithium phenyl phosphate, 2 cesium phenyl phosphate, Sodium, potassium, lithium, cesium alcoholate, phenolate, disodium salt of bisphenol A, 2 potassium salt, 2 lithium salt, 2 cesium salt and the like.

  Examples of the alkaline earth metal compound include calcium hydroxide, barium hydroxide, magnesium hydroxide, strontium hydroxide, calcium hydrogen carbonate, barium hydrogen carbonate, magnesium hydrogen carbonate, strontium hydrogen carbonate, calcium carbonate, barium carbonate, Examples thereof include magnesium carbonate, strontium carbonate, calcium acetate, barium acetate, magnesium acetate, strontium acetate, calcium stearate, barium stearate, magnesium stearate, and strontium stearate.

  Specific examples of basic boron compounds used in combination with alkali metal compounds and / or alkaline earth metal compounds include tetramethyl boron, tetraethyl boron, tetrapropyl boron, tetrabutyl boron, trimethylethyl boron, trimethylbenzyl boron, Sodium salt such as trimethylphenylboron, triethylmethylboron, triethylbenzylboron, triethylphenylboron, tributylbenzylboron, tributylphenylboron, tetraphenylboron, benzyltriphenylboron, methyltriphenylboron, butyltriphenylboron, potassium salt, Examples include lithium salts, calcium salts, barium salts, magnesium salts, and strontium salts.

  Examples of the basic phosphorus compound include triethylphosphine, tri-n-propylphosphine, triisopropylphosphine, tri-n-butylphosphine, triphenylphosphine, tributylphosphine, and quaternary phosphonium salt.

  Examples of the basic ammonium compound include tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, trimethylethylammonium hydroxide, trimethylbenzylammonium hydroxide, trimethylphenylammonium hydroxide, Triethylmethylammonium hydroxide, triethylbenzylammonium hydroxide, triethylphenylammonium hydroxide, tributylbenzylammonium hydroxide, tributylphenylammonium hydroxide, tetraphenylammonium hydroxide, benzyltriphenylammonium hydroxide, methyltriphenylammonium hydroxide Sid, butyl triphenyl ammonium hydroxide, and the like.

  Examples of the amine compound include 4-aminopyridine, 2-aminopyridine, N, N-dimethyl-4-aminopyridine, 4-diethylaminopyridine, 2-hydroxypyridine, 2-methoxypyridine, 4-methoxypyridine, 2 -Dimethylaminoimidazole, 2-methoxyimidazole, imidazole, 2-mercaptoimidazole, 2-methylimidazole, aminoquinoline and the like.

  In the case of an alkali metal compound and / or an alkaline earth metal compound, the amount of the polymerization catalyst used is metal conversion with respect to a total of 1 mol of the dihydroxy compound represented by the general formula (1) and the alicyclic dihydroxy compound. The amount is usually in the range of 0.1 to 100 μmol, preferably in the range of 0.5 to 50 μmol, and more preferably in the range of 1 to 25 μmol. If the amount of the polymerization catalyst used is too small, the polymerization activity necessary to produce a polycarbonate resin having a desired molecular weight cannot be obtained. On the other hand, if the amount of the polymerization catalyst used is too large, the hue of the resulting polycarbonate resin deteriorates. However, by-products are generated and fluidity is lowered and gels are generated, which makes it difficult to produce a polycarbonate resin having a target quality.

  In the production of the polycarbonate resin in the present invention, the dihydroxy compound such as the dihydroxy compound represented by the general formula (I) may be supplied as a solid, or may be supplied in a molten state by heating. However, it may be supplied as an aqueous solution. When these raw material dihydroxy compounds are supplied in a molten state or in an aqueous solution, there is an advantage that they are easily metered and transported when industrially produced.

  In the present invention, the method of reacting the dihydroxy compound or copolymer component represented by the general formula (I) with a carbonic acid diester in the presence of a polymerization catalyst is usually carried out in a multistage process of two or more stages. Specifically, the first stage reaction is usually carried out at a temperature of 140 to 220 ° C., preferably 150 to 200 ° C., usually for 0.1 to 10 hours, preferably 0.5 to 3 hours. From the second stage onward, the reaction temperature is raised while gradually reducing the pressure of the reaction system from the pressure of the first stage, and at the same time, the phenol generated at the same time is removed from the reaction system. Is 200 Pa or less, and a polycondensation reaction is performed under the temperature range of 210-280 degreeC.

  In the pressure reduction in this polycondensation reaction, it is important to control the balance between temperature and pressure in the reaction system. In particular, if either one of the temperature and the pressure is changed too quickly, unreacted monomers are distilled out, the molar ratio of the dihydroxy compound and the carbonic acid diester may be changed, and the degree of polymerization may be lowered. For example, when isosorbide and 1,4-cyclohexanedimethanol are used as the dihydroxy compound, 1,4-cyclohexanedimethanol is used when the molar ratio of 1,4-cyclohexanedimethanol to the total dihydroxy compound is 50 mol% or more. Since methanol easily distills out as a monomer, the reaction is carried out under a reduced pressure of about 13 kPa while the temperature is increased at a rate of temperature increase of 40 ° C. or less per hour, and further up to about 6.67 kPa. When the temperature is increased at a rate of temperature increase of 40 ° C. or less per hour under the pressure of, and finally the polycondensation reaction is performed at a temperature of 200 to 250 ° C. at a pressure of 200 Pa or less, the degree of polymerization sufficiently increases The obtained polycarbonate resin is preferable.

  Further, when the molar ratio of 1,4-cyclohexanedimethanol is less than 50 mol% with respect to all dihydroxy compounds, particularly when the molar ratio is 30 mol% or less, 1,4-cyclohexanedimethanol Compared with the case where the molar ratio is 50 mol% or more, the viscosity rises rapidly. For example, the temperature is increased at a rate of 40 ° C. or less per hour until the pressure in the reaction system is reduced to about 13 kPa. The reaction is further performed at a temperature rising rate of 40 ° C. or more per hour, preferably at a temperature rising rate of 50 ° C. or more per hour under a pressure up to about 6.67 kPa. When a polycondensation reaction is finally performed at a temperature of 220 to 290 ° C. under a reduced pressure of 200 Pa or less, a polycarbonate resin having a sufficiently increased degree of polymerization is obtained, which is preferable.

  The type of reaction may be any of batch type, continuous type, or a combination of batch type and continuous type.

  When the polycarbonate resin in the present invention is produced by the melt polymerization method, one or more of a phosphoric acid compound and a phosphorous acid compound can be added during polymerization for the purpose of preventing coloring.

  As the phosphoric acid compound, one or more of trialkyl phosphates such as trimethyl phosphate and triethyl phosphate are preferably used. These are preferably added in an amount of 0.0001 mol% to 0.005 mol%, more preferably 0.0003 mol% to 0.003 mol%, based on all hydroxy compound components. When the addition amount of the phosphorus compound is less than the above lower limit, the effect of preventing coloring is small, and when it is more than the above upper limit, the transparency is lowered, or conversely, the coloring is promoted or the heat resistance is lowered.

  Moreover, as a phosphorous acid compound, the heat stabilizer shown below can be selected arbitrarily and used. In particular, trimethyl phosphite, triethyl phosphite, trisnonylphenyl phosphite, trimethyl phosphate, tris (2,4-di-tert-butylphenyl) phosphite, bis (2,4-di-tert-butylphenyl) One or more of pentaerythritol diphosphites can be suitably used. These phosphorous acid compounds are preferably added in an amount of 0.0001 mol% to 0.005 mol%, more preferably 0.0003 mol% to 0.003 mol%, based on the total hydroxy compound components. It is preferable to do. If the amount of the phosphite compound is less than the above lower limit, the anti-coloring effect is small, and if it is more than the above upper limit, it may cause a decrease in transparency, conversely promote coloring, or reduce heat resistance. Sometimes.

  The phosphoric acid compound and the phosphorous acid compound can be added in combination, but the addition amount in that case is the total amount of the phosphoric acid compound and the phosphorous acid compound, and the total hydroxy compound component described above, The content is preferably 0.0001 mol% or more and 0.005 mol% or less, more preferably 0.0003 mol% or more and 0.003 mol% or less. If this addition amount is less than the above lower limit, the effect of preventing coloring is small, and if it is more than the above upper limit, the transparency may be lowered, or conversely, coloring may be promoted or heat resistance may be lowered. .

  In addition, the polycarbonate resin according to the present invention thus produced may be blended with one or more thermal stabilizers in order to prevent a decrease in molecular weight or a deterioration in hue at the time of molding or the like. .

  Examples of the heat stabilizer include phosphorous acid, phosphoric acid, phosphonous acid, phosphonic acid, and esters thereof. Specifically, triphenyl phosphite, tris (nonylphenyl) phosphite, tris ( 2,4-di-tert-butylphenyl) phosphite, tridecyl phosphite, trioctyl phosphite, trioctadecyl phosphite, didecyl monophenyl phosphite, dioctyl monophenyl phosphite, diisopropyl monophenyl phosphite, monobutyl Diphenyl phosphite, monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, 2,2-methylenebis (4,6-di) -Tert Butylphenyl) octyl phosphite, bis (nonylphenyl) pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, distearyl pentaerythritol diphosphite, tributyl phosphate, triethyl phosphate , Trimethyl phosphate, triphenyl phosphate, diphenyl monoorthoxenyl phosphate, dibutyl phosphate, dioctyl phosphate, diisopropyl phosphate, 4,4′-biphenylenediphosphinic acid tetrakis (2,4-di-tert-butylphenyl), dimethylbenzenephosphonate , Diethyl benzenephosphonate, dipropyl benzenephosphonate and the like. Among them, trisnonylphenyl phosphite, trimethyl phosphate, tris (2,4-di-tert-butylphenyl) phosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2 , 6-Di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite and dimethyl benzenephosphonate are preferably used.

  Such a heat stabilizer can be further added in addition to the addition amount added at the time of melt polymerization. That is, after blending an appropriate amount of a phosphorous acid compound or phosphoric acid compound to obtain a polycarbonate resin, if a phosphorous acid compound is further blended by a blending method described later, transparency during polymerization is reduced, coloring Further, it is possible to blend more heat stabilizers while avoiding a decrease in heat resistance, and it is possible to prevent deterioration of hue.

  The content of these heat stabilizers is preferably 0.0001 to 1 part by weight, more preferably 0.0005 to 0.5 part by weight, and 0.001 to 0.2 part by weight based on 100 parts by weight of the polycarbonate resin. Part is more preferred.

  In addition, the polycarbonate resin in the present invention may be blended with one or two or more kinds of antioxidants generally known for the purpose of antioxidant.

  Examples of the antioxidant include pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-lauryl thiopropionate), glycerol-3-stearyl thiopropionate, triethylene glycol-bis [3 -(3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 1,6-hexanediol-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], Pentaerythritol-tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 1, 3,5-trimethyl-2,4 -Tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, N, N-hexamethylenebis (3,5-di-tert-butyl-4-hydroxy-hydrocinnamide), 3,5 -Di-tert-butyl-4-hydroxy-benzylphosphonate-diethyl ester, tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 4,4'-biphenylenediphosphinic acid tetrakis (2,4 -Di-tert-butylphenyl), 3,9-bis {1,1-dimethyl-2- [β- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] ethyl} -2, 4,8,10-tetraoxaspiro (5,5) undecane and the like.

  The content of these antioxidants is preferably 0.0001 to 0.5 parts by weight with respect to 100 parts by weight of the polycarbonate.

  Further, the polycarbonate in the present invention is separated from the cooling roll at the time of sheet forming or the mold release property from the mold at the time of injection molding so as not to impair the purpose of the present invention. One type or two or more types of molds may be blended.

  Such release agents include higher fatty acid esters of monohydric or polyhydric alcohols, higher fatty acids, paraffin wax, beeswax, olefinic waxes, olefinic waxes containing carboxy groups and / or carboxylic anhydride groups, silicone oils, Examples include organopolysiloxane.

  The higher fatty acid ester is preferably a partial ester or a total ester of a monovalent or polyhydric alcohol having 1 to 20 carbon atoms and a saturated fatty acid having 10 to 30 carbon atoms. Such partial esters or total esters of monohydric or polyhydric alcohols and saturated fatty acids include stearic acid monoglyceride, stearic acid diglyceride, stearic acid triglyceride, stearic acid monosorbite, stearyl stearate, behenic acid monoglyceride, behenyl behenate, Pentaerythritol monostearate, pentaerythritol tetrastearate, pentaerythritol tetrapelargonate, propylene glycol monostearate, stearyl stearate, palmityl palmitate, butyl stearate, methyl laurate, isopropyl palmitate, biphenyl biphenate Sorbitan monostearate, 2-ethylhexyl stearate and the like. Of these, stearic acid monoglyceride, stearic acid triglyceride, pentaerythritol tetrastearate, and behenyl behenate are preferably used.

  As the higher fatty acid, a saturated fatty acid having 10 to 30 carbon atoms is preferable. Such fatty acids include myristic acid, lauric acid, palmitic acid, stearic acid, behenic acid and the like.

  The content of the release agent is preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the polycarbonate resin.

  The polycarbonate resin in the present invention is significantly less discolored by ultraviolet rays than conventional polycarbonate resins. However, for the purpose of further improvement, it is one of the ultraviolet absorbers and light stabilizers within the range that does not impair the purpose of the present invention. Seeds or two or more species may be blended.

  Examples of such ultraviolet absorbers and light stabilizers include 2- (2′-hydroxy-5′-tert-octylphenyl) benzotriazole, 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl)- 5-chlorobenzotriazole, 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2 2,2′-methylenebis (4-cumyl-6-benzotriazolephenyl), 2,2′-p-phenylenebis (1,3-benzoxazin-4-one), and the like.

  As for content of this ultraviolet absorber and light stabilizer, 0.01-2 weight part is preferable with respect to 100 weight part of polycarbonate.

  In addition, the polycarbonate resin in the present invention may be blended with one or two or more types of bluing agents in order to cancel the yellowness as the sound insulating member. Any bluing agent can be used without any problem as long as it is used in conventional polycarbonate resins. In general, anthraquinone dyes are preferred because they are readily available.

  As a specific bluing agent, for example, the general name Solvent Violet 13 [CA. (Color Index No.) 60725], generic name Solvent Violet 31 [CA. 68210], generic name Solvent Violet 33 [CA. 60725], generic name Solvent Blue 94 [CA. 61500], generic name Solvent Violet 36 [CA. 68210], generic name Solvent Blue 97 [manufactured by Bayer, "Macrolex Violet RR"], and generic name Solvent Blue 45 [CA. 61110] and the like are typical examples.

  The content of these bluing agents is usually preferably 0.1 × 10 −4 to 2 × 10 −4 parts by weight with respect to 100 parts by weight of the polycarbonate resin.

  Further, the polycarbonate resin in the present invention may be a resin composition containing the above-mentioned additives, and in addition to the above-mentioned additives, various known additives such as Further, it may be a resin composition containing an impact resistance improver, a flame retardant, a flame retardant aid, a hydrolysis inhibitor, an antistatic agent, a foaming agent, a dye and pigment, and the like. Also, for example, a resin composition in which a synthetic resin such as aromatic polycarbonate, aromatic polyester, polyamide, polystyrene, polyolefin, acrylic, amorphous polyolefin, or the like, or a biodegradable resin such as polylactic acid or polybutylene succinate is mixed. May be.

  In the sound insulating member of the present invention, examples of the blending method of the polycarbonate resin and the various additives as described above include, for example, a tumbler, a V-type blender, a super mixer, a nauter mixer, a Banbury mixer, a kneading roll, and an extruder. There is a method of mixing and kneading, or a solution blending method of mixing in a state of being dissolved in a common good solvent such as methylene chloride, but this is not particularly limited, and a commonly used blending method Any method may be used.

  The polycarbonate resin in the present invention thus obtained is added with various additives and the like, and is usually known as an extrusion molding method, an injection molding method, a compression molding method, etc. directly or once after being pelletized by a melt extruder. The sound insulation member having a desired shape can be formed by a forming method that has been used.

  In order to increase the miscibility of the polycarbonate resin in the present invention and obtain stable physical properties, it is preferable to use a single screw extruder or a twin screw extruder in the melt extrusion. The method using a single screw extruder or a twin screw extruder does not require the use of a solvent or the like, has a low environmental load, and can be suitably used from the viewpoint of productivity. In the polycarbonate resin when the sound insulating member of the present invention is molded, the melt kneading temperature of the extruder is usually 200 to 300 ° C, preferably 220 to 260 ° C. When the melt kneading temperature is lower than 200 ° C., the melt viscosity of the polycarbonate resin is high, the load on the extruder is increased, and the productivity is lowered. When the temperature is higher than 300 ° C., the polycarbonate resin is likely to be deteriorated, and the color as the sound insulating member is yellowed or the molecular weight is lowered, so that the strength is deteriorated.

  When an extruder is used, it is desirable to install a filter in order to prevent the polycarbonate resin from being burned and foreign matters from being mixed during extrusion. The aperture for removing foreign matter from the filter is preferably 100 μm or less, although it depends on the required optical accuracy. In particular, in the case of dislike mixing foreign substances, it is preferably 40 μm or less, more preferably 10 μm or less. In addition, it is desirable to carry out molding such as extrusion molding of polycarbonate resin in a clean room in order to prevent foreign matter from entering during or after molding.

  When the extruded polycarbonate resin is cooled to form chips, it is preferable to use a cooling method such as air cooling or water cooling. The air used for air cooling should be air from which foreign substances in the air have been removed in advance with a HEPA filter (a filter specified in JIS Z8112), etc., to prevent reattachment of foreign substances in the air. desirable. When using water cooling, it is desirable to use water from which metal in water has been removed with an ion exchange resin or the like, and foreign matter in water has been removed with a filter. There are various openings of the filter to be used, but those having a filter of 10 to 0.45 μm are preferable.

  When the sound insulation member using the polycarbonate resin of the present invention is molded by injection molding, the resin temperature is preferably 220 to 290 ° C and the mold temperature is preferably 30 to 120 ° C.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited by a following example, unless the summary is exceeded. In the following, the physical properties or characteristics of the polycarbonate resin were evaluated by the following methods.

(1) Reduced viscosity Using a Ubbelohde viscometer, a mixed solvent of phenol and 1,1,2,2, -tetrachloroethane in a weight ratio of 1: 1 is used as the solvent, and the concentration is precisely adjusted to 1.00 g / dl. And measured at a temperature of 30.0 ° C. ± 0.1 ° C.

(2) Density Density was measured at 23 ° C. by a water displacement method using an electronic hydrometer (“ED-120T” manufactured by Alpha Mirage (formerly Mirage Trade)).

(3) Glass transition temperature Using a differential scanning calorimeter ("DSC822" manufactured by METTLER), about 10 mg of the sample was heated and measured at a heating rate of 10 ° C / min, and in accordance with JIS K7121 (1987). Start of extrapolation glass transition, which is the temperature at the intersection of a straight line that extends the base line on the low temperature side to the high temperature side and the broken line drawn at the point where the slope of the step change part of the glass transition is maximized The temperature was determined.

(4) Sound insulation properties Using an injection molding machine ("NADEM2000" manufactured by Meiki Seisakusho Co., Ltd.), a test piece of 150 mm x 200 mm and a thickness of 4 mm was injection molded at a temperature of 230 to 260 ° C.
On the other hand, a cork sheet (made by Astage Co., Ltd., 4 mm thick) is cut and double-coated with double-sided tape, and a 150 mm x 200 mm square cylindrical body is foamed to prevent out of shape on each side. Assemble two cylindrical bodies covered with PP sheet (made by Acrysander, thickness 5mm), and place one bottom of the cylindrical body inside with an impact detector ("Slim Alarm ELPA" manufactured by Asahi Electric Co., Ltd.) ASA-S11 (PW) ") is closed with a cork sheet set with a double-sided tape, and the other bottom surface side is closed with the injection molded test piece obtained above. On top of that, another cylindrical body is fixed so that the test piece is sandwiched with one bottom face side as the test piece side, and a sound level meter ("NL-21" manufactured by RION Co., Ltd.) is set on the other bottom face side. In this state, the impact detector was operated, and the noise transmitted through the test piece was measured with a sound level meter. The measured sound pressure when the test piece was not installed was 103.8 dB.

(5) Impact resistance strength A test piece was prepared using the injection molding machine used in the measurement of the sound insulation characteristics, and the Izod impact strength was measured in accordance with JIS K7111.

(6) Scratch hardness (pencil method) test A test piece was prepared using the injection molding machine used in the measurement of the sound insulation characteristics, and the pencil hardness was in the range of 6B to 6H in accordance with JIS K5600-5-4. Measured with

(7) Flammability test A test piece having a thickness of 3 mm was prepared using the injection molding machine used in the measurement of the sound insulation characteristics, and measured according to the UL-94 standard horizontal flammability test (HB). As an evaluation method, the combustion state was confirmed by a method in which a test flame was applied to one end of the test piece for 30 seconds and removed. If the fire is extinguished without spreading over the entire specimen, it is judged as a self-extinguishing material.

(8) Weather resistance discoloration test Using a test piece similar to that produced during the measurement of the sound insulation characteristics, it was installed on an inclined surface of 45 degrees south in Yokkaichi, Yokkaichi City, Mie Prefecture, 2006. The weather resistance discoloration test was carried out from mid-January to mid-October. For the test pieces before and after the test, a color difference ΔE was measured using a spectroscopic color difference meter (“SE-2000” manufactured by Nippon Denshoku Industries Co., Ltd.).

(9) Quantification of formic acid Isosorbide was diluted 100 times with pure water and measured with an ion chromatograph (“DX-500 type” manufactured by Dionex).

Example 1
13.0 parts by weight (0.221 moles) of 1,4-cyclohexanedimethanol (Eastman) with respect to 27.7 parts by weight (0.516 moles) of isosorbide (Rocket Fleure, formic acid content 5 ppm) ), Diphenyl carbonate (manufactured by Mitsubishi Chemical Corporation) 59.2 parts by weight (0.752 mol), and cesium carbonate (manufactured by Wako Pure Chemical Industries, Ltd.) 2.21 × 10 −4 parts by weight (1.84 × 10 6) as a catalyst. −6 mol) was charged into the reaction vessel, and the heating bath temperature was heated to 150 ° C. as a first step of the reaction in a nitrogen atmosphere, and the raw materials were dissolved while stirring as necessary. (About 15 minutes). Subsequently, the pressure was changed from normal pressure to 13.3 kPa, and the generated phenol was extracted out of the reaction vessel while the heating bath temperature was increased to 190 ° C. over 1 hour.

  After maintaining the entire reaction vessel at 190 ° C. for 15 minutes, as a second step, the pressure in the reaction vessel is set to 6.67 kPa, the heating bath temperature is increased to 230 ° C. in 15 minutes, and the generated phenol is removed. It was extracted out of the reaction vessel. Since the stirring torque of the stirrer increased, the temperature was raised to 250 ° C. in 8 minutes, and the pressure in the reaction vessel was allowed to reach 0.200 kPa or less in order to remove the generated phenol. After reaching a predetermined stirring torque, the reaction was terminated, and the produced reaction product was extruded into water to obtain polycarbonate resin pellets. With respect to the obtained polycarbonate resin, reduced viscosity, density, glass transition temperature, sound insulation properties, Izod impact strength, pencil hardness, flammability, and weather resistance change (ΔE) were evaluated by the evaluation methods described above. The obtained results are shown in Table 1.

Comparative Example 1
Using a bisphenol A type polycarbonate resin ("Iupilon" manufactured by Mitsubishi Engineering Plastics), the reduced viscosity, density, glass transition temperature, sound insulation properties, Izod impact strength, pencil hardness, flammability, and weather resistance are evaluated according to the evaluation methods described above. Discoloration (ΔE) was evaluated. The obtained results are shown in Table 1.

Comparative Example 2
For polyacrylic resin (“Acrypet MF” manufactured by Mitsubishi Rayon Co., Ltd.), the reduced viscosity, density, glass transition temperature, sound insulation property, Izod impact strength, pencil hardness, flammability, and weather resistance change (ΔE) according to the evaluation method described above. ) Was evaluated. The obtained results are shown in Table 1.

Table 1 shows the following.
1) Conventional polycarbonate resin has characteristics that the glass transition temperature and impact strength are too sufficient as a material for a sound insulation member, and is a self-extinguishing material. However, the pencil hardness is as low as B, and the weather discoloration resistance is inferior. On the other hand, the acrylate resin has a sufficient pencil hardness of 2H and excellent weather discoloration, but has a low glass transition temperature and impact resistance, and is easily combustible.
2) On the other hand, a polycarbonate resin containing a structural unit derived from isosorbide has sufficient glass transition temperature and impact strength for a sound insulation member, and pencil hardness and weather resistance which are inferior to those of conventional polycarbonate resins. The discoloration is improved as well as the acrylate resin, and the flammability, which was a major drawback of the acrylate resin, has been improved to the self-extinguishing class and has extremely good characteristics for the sound insulation member.

  The sound insulation member made of the polycarbonate resin of the present invention using a plant-derived monomer can be expected to be used as a sound insulation member having transparency after solving problems in environmental and resource conservation. High altitude, small weather discoloration, self-extinguishing, and good balance between glass transition temperature and impact strength, so that the ceiling of arcade can be used in daily life, transportation, industrial, civil engineering, and other areas. In the field of seats and plates, sound insulation walls such as roads, facility roofing materials, and housing equipment, it can be expected to be used for terrace seats, housing interior materials (partitions, etc.).

Claims (7)

A sound insulating member comprising a polycarbonate resin containing a structural unit derived from a dihydroxy compound represented by the following general formula (1).

  The sound insulating member according to claim 1, wherein the polycarbonate resin further contains a structural unit derived from an alicyclic dihydroxy compound.   The ratio (mol%) of the structural unit derived from the dihydroxy compound represented by the general formula (1) and the structural unit derived from the alicyclic dihydroxy compound in the polycarbonate resin is in the range of 99: 1 to 30:70. The sound insulating member according to claim 2.   The sound insulation member according to any one of claims 1 to 3, wherein the polycarbonate resin further contains a structural unit derived from an aromatic dihydroxy compound.   The sound insulating member according to claim 4, wherein the ratio of structural units derived from the aromatic dihydroxy compound in the polycarbonate resin is in the range of 5 to 40 mol% with respect to the total dihydroxy compound.   The sound insulation member according to any one of claims 1 to 5, wherein the density of the polycarbonate resin is 1.30 g / cm3 or more. The sound insulating member according to any one of claims 1 to 6, wherein the polycarbonate resin has a glass transition temperature of 80 ° C or higher.