JP6983059B2 - ジヒドロキシナフタレン縮合物の製造方法及びジヒドロキシナフタレン縮合物 - Google Patents
ジヒドロキシナフタレン縮合物の製造方法及びジヒドロキシナフタレン縮合物 Download PDFInfo
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- JP6983059B2 JP6983059B2 JP2017248937A JP2017248937A JP6983059B2 JP 6983059 B2 JP6983059 B2 JP 6983059B2 JP 2017248937 A JP2017248937 A JP 2017248937A JP 2017248937 A JP2017248937 A JP 2017248937A JP 6983059 B2 JP6983059 B2 JP 6983059B2
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- Prior art keywords
- dihydroxynaphthalene
- condensate
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- ppm
- composition
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- 238000004519 manufacturing process Methods 0.000 title claims description 41
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- BOKGTLAJQHTOKE-UHFFFAOYSA-N 1,5-dihydroxynaphthalene Chemical compound C1=CC=C2C(O)=CC=CC2=C1O BOKGTLAJQHTOKE-UHFFFAOYSA-N 0.000 claims description 8
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- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- 239000003377 acid catalyst Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- DZULQZKFBAHSRX-UHFFFAOYSA-N adamantane-1-carbaldehyde Chemical compound C1C(C2)CC3CC2CC1(C=O)C3 DZULQZKFBAHSRX-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- XJDFBLQCLSBCGQ-UHFFFAOYSA-N anthracene-1-carbaldehyde Chemical compound C1=CC=C2C=C3C(C=O)=CC=CC3=CC2=C1 XJDFBLQCLSBCGQ-UHFFFAOYSA-N 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 1
- 229910001863 barium hydroxide Inorganic materials 0.000 description 1
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 description 1
- 229940092714 benzenesulfonic acid Drugs 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- RJGHQTVXGKYATR-UHFFFAOYSA-L dibutyl(dichloro)stannane Chemical compound CCCC[Sn](Cl)(Cl)CCCC RJGHQTVXGKYATR-UHFFFAOYSA-L 0.000 description 1
- JGFBRKRYDCGYKD-UHFFFAOYSA-N dibutyl(oxo)tin Chemical compound CCCC[Sn](=O)CCCC JGFBRKRYDCGYKD-UHFFFAOYSA-N 0.000 description 1
- AYOHIQLKSOJJQH-UHFFFAOYSA-N dibutyltin Chemical compound CCCC[Sn]CCCC AYOHIQLKSOJJQH-UHFFFAOYSA-N 0.000 description 1
- 229940019778 diethylene glycol diethyl ether Drugs 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 1
- NKDDWNXOKDWJAK-UHFFFAOYSA-N dimethoxymethane Chemical compound COCOC NKDDWNXOKDWJAK-UHFFFAOYSA-N 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011964 heteropoly acid Substances 0.000 description 1
- GNOIPBMMFNIUFM-UHFFFAOYSA-N hexamethylphosphoric triamide Chemical compound CN(C)P(=O)(N(C)C)N(C)C GNOIPBMMFNIUFM-UHFFFAOYSA-N 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 150000007529 inorganic bases Chemical class 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004255 ion exchange chromatography Methods 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 150000007517 lewis acids Chemical class 0.000 description 1
- SIAPCJWMELPYOE-UHFFFAOYSA-N lithium hydride Chemical compound [LiH] SIAPCJWMELPYOE-UHFFFAOYSA-N 0.000 description 1
- 229910000103 lithium hydride Inorganic materials 0.000 description 1
- OVWYEQOVUDKZNU-UHFFFAOYSA-N m-tolualdehyde Chemical compound CC1=CC=CC(C=O)=C1 OVWYEQOVUDKZNU-UHFFFAOYSA-N 0.000 description 1
- CCERQOYLJJULMD-UHFFFAOYSA-M magnesium;carbanide;chloride Chemical compound [CH3-].[Mg+2].[Cl-] CCERQOYLJJULMD-UHFFFAOYSA-M 0.000 description 1
- FRIJBUGBVQZNTB-UHFFFAOYSA-M magnesium;ethane;bromide Chemical compound [Mg+2].[Br-].[CH2-]C FRIJBUGBVQZNTB-UHFFFAOYSA-M 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229940098779 methanesulfonic acid Drugs 0.000 description 1
- DVSDBMFJEQPWNO-UHFFFAOYSA-N methyllithium Chemical compound C[Li] DVSDBMFJEQPWNO-UHFFFAOYSA-N 0.000 description 1
- 238000005459 micromachining Methods 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- XOOMNEFVDUTJPP-UHFFFAOYSA-N naphthalene-1,3-diol Chemical compound C1=CC=CC2=CC(O)=CC(O)=C21 XOOMNEFVDUTJPP-UHFFFAOYSA-N 0.000 description 1
- PCILLCXFKWDRMK-UHFFFAOYSA-N naphthalene-1,4-diol Chemical compound C1=CC=C2C(O)=CC=C(O)C2=C1 PCILLCXFKWDRMK-UHFFFAOYSA-N 0.000 description 1
- FZZQNEVOYIYFPF-UHFFFAOYSA-N naphthalene-1,6-diol Chemical compound OC1=CC=CC2=CC(O)=CC=C21 FZZQNEVOYIYFPF-UHFFFAOYSA-N 0.000 description 1
- ZUVBIBLYOCVYJU-UHFFFAOYSA-N naphthalene-1,7-diol Chemical compound C1=CC=C(O)C2=CC(O)=CC=C21 ZUVBIBLYOCVYJU-UHFFFAOYSA-N 0.000 description 1
- JRNGUTKWMSBIBF-UHFFFAOYSA-N naphthalene-2,3-diol Chemical compound C1=CC=C2C=C(O)C(O)=CC2=C1 JRNGUTKWMSBIBF-UHFFFAOYSA-N 0.000 description 1
- MNZMMCVIXORAQL-UHFFFAOYSA-N naphthalene-2,6-diol Chemical compound C1=C(O)C=CC2=CC(O)=CC=C21 MNZMMCVIXORAQL-UHFFFAOYSA-N 0.000 description 1
- 239000006199 nebulizer Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 150000007530 organic bases Chemical class 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- FXLOVSHXALFLKQ-UHFFFAOYSA-N p-tolualdehyde Chemical compound CC1=CC=C(C=O)C=C1 FXLOVSHXALFLKQ-UHFFFAOYSA-N 0.000 description 1
- 229940100595 phenylacetaldehyde Drugs 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- NTTOTNSKUYCDAV-UHFFFAOYSA-N potassium hydride Chemical compound [KH] NTTOTNSKUYCDAV-UHFFFAOYSA-N 0.000 description 1
- 229910000105 potassium hydride Inorganic materials 0.000 description 1
- LPNYRYFBWFDTMA-UHFFFAOYSA-N potassium tert-butoxide Chemical compound [K+].CC(C)(C)[O-] LPNYRYFBWFDTMA-UHFFFAOYSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 238000011403 purification operation Methods 0.000 description 1
- RCYFOPUXRMOLQM-UHFFFAOYSA-N pyrene-1-carbaldehyde Chemical compound C1=C2C(C=O)=CC=C(C=C3)C2=C2C3=CC=CC2=C1 RCYFOPUXRMOLQM-UHFFFAOYSA-N 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000012312 sodium hydride Substances 0.000 description 1
- 229910000104 sodium hydride Inorganic materials 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-N sulfonic acid Chemical compound OS(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-N 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- LTSUHJWLSNQKIP-UHFFFAOYSA-J tin(iv) bromide Chemical compound Br[Sn](Br)(Br)Br LTSUHJWLSNQKIP-UHFFFAOYSA-J 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- UBZYKBZMAMTNKW-UHFFFAOYSA-J titanium tetrabromide Chemical compound Br[Ti](Br)(Br)Br UBZYKBZMAMTNKW-UHFFFAOYSA-J 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 1
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
Images
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- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
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- C07C37/68—Purification; separation; Use of additives, e.g. for stabilisation
- C07C37/70—Purification; separation; Use of additives, e.g. for stabilisation by physical treatment
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- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/04—Condensation polymers of aldehydes or ketones with phenols only of aldehydes
- C08G8/08—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ
- C08G8/20—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ with polyhydric phenols
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Description
本発明のジヒドロキシナフタレン縮合物は、ジヒドロキシナフタレンと縮合剤の縮合物であり、前記ジヒドロキシナフタレン縮合物に含まれる成分元素中の硫黄元素の含有量が、質量比で100ppm以下のものである。
本発明のヒドロキシナフタレン縮合物の原料は、下記一般式(1)で示されるジヒドロキシナフタレンである。
本発明のヒドロキシナフタレン縮合物の縮合剤としては、特に限定されないが、例えばホルムアルデヒド、トリオキサン、パラホルムアルデヒド、アセトアルデヒド、プロピルアルデヒド、アダマンタンカルボアルデヒド、ベンズアルデヒド、ヒドロキシベンズアルデヒド、フェニルアセトアルデヒド、α−フェニルプロピルアルデヒド、β−フェニルプロピルアルデヒド、o−クロロベンズアルデヒド、m−クロロベンズアルデヒド、p−クロロベンズアルデヒド、o−ニトロベンズアルデヒド、m−ニトロベンズアルデヒド、p−ニトロベンズアルデヒド、o−メチルベンズアルデヒド、m−メチルベンズアルデヒド、p−メチルベンズアルデヒド、p−エチルベンズアルデヒド、p−n−ブチルベンズアルデヒド、1−ナフチルアルデヒド、2−ナフチルアルデヒド、6−ヒドロキシ−2−ナフチルアルデヒド、アントラセンカルボアルデヒド、ピレンカルボアルデヒド、フルフラール、メチラール等を挙げることができる。また、好ましくは、ホルムアルデヒド、パラホルムアルデヒドを挙げることが出来る。
また、本発明では、ジヒドロキシナフタレン縮合物の製造方法であって、ジヒドロキシナフタレンとして、成分元素中の硫黄元素の含有量が、質量比で100ppm以下のものを用い、該ジヒドロキシナフタレンと縮合剤を酸又は塩基の存在下で縮合させて前記ジヒドロキシナフタレン縮合物を製造するジヒドロキシナフタレン縮合物の製造方法を提供する。
本発明のジヒドロキシナフタレン縮合物の製造方法に用いられるジヒドロキシナフタレンとしては、上記で説明した成分元素中の硫黄元素の含有量が質量比で100ppm以下のものを用いることが出来る。
また、本発明のジヒドロキシナフタレン縮合物の製造方法に用いられる縮合物としては、上記で説明したものと同様のものを用いることが出来る。
上記のような原料を使用する重縮合反応は、通常、無溶媒又は溶媒中で酸又は塩基を触媒として用いて、室温又は必要に応じて冷却又は加熱下に行うことが出来る。
市販の1,5−ジヒドロキシナフタレン(以下15DHN、硫黄元素含有量400ppm、ICP−OESで測定)72.2gをプロピレングリコールメチルエーテル(以下PGME)127.6g、メチルイソブチルケトン(以下MIBK)353.6gの混合溶媒下にて溶解した。そこに、中性アルミナ(富田製薬製 トミタ―AD−250NS 粒径60〜250μm pH7.5)57.2gを加え、室温で12時間撹拌した後、中性アルミナを濾別し、得られた15DHNのPGME/MIBK溶液をイオン交換水にて水洗し、PGMEを追加、濃縮し500gの13wt%15DHN−PGME溶液を得た。この15DHN溶液の固形分当りの硫黄元素含有量をICP−OESで測定したところ45ppmであった。
市販の15DHNを中性アルミナで処理せずに重合反応に使用した以外は合成例1と同様の反応で比較ポリマー1を得た。得られた比較ポリマー1のポリスチレン換算の分子量(Mw)、分散度(Mw/Mn)をゲルパーミエーションクロマトグラフィー(GPC)測定、硫黄元素含有量をICP−OES測定したところ、分子量(Mw)3,600、分散度(Mw/Mn)=2.03、硫黄元素含有量は435ppmであった。
(前処理:マイクロウエーブ分解法)
本サンプルのICP−OES用の前処理は、マイクロウエーブ試料分解装置(MULTIWAVE3000 Anton Paar社製)にて実施した。サンプル0.5g及び69.0%硝酸(Ultrapur−100 関東化学製)10mlをPTFE(polytetrafluoroethylene)製分解容器に入れて1時間静置した後、85分間本装置にてマイクロウエーブ分解を実施した。分解後、溶液をTPX製保存容器に移液し、全量が50gになる様に蒸留水にて希釈し、100倍希釈サンプルを作製した。
ICP−OESによる硫黄元素含有量の分析は、CID/ICP発光分析装置(iCAP6000DUO Thermo Fisher SCIENTIFIC社製)にて実施した。前述の前処理された100倍希釈サンプルを以下設定条件にて測定を行った。
高周波出力:1150W
プラズマガス流量:12.0L/min
補助ガス流量:0.5L/min
ネブライザーガス流量:0.5L/min
ペリスタリックポンプ回転数:50rpm
測定方向:アキシャル
分析積分時間(低波長/高波長):10秒/10秒
分析積分回数:3回
試料置換時間:30秒
合成例1で得られたポリマー1(中性アルミナ処理品)、比較合成例1で得られた比較ポリマー1(中性アルミナ未処理品)の20質量%PGMEA溶液を調製し、0.1μmの目開きを持つ10インチ(250mm)PTFE製フィルターにて濾過を実施したところ、濾過時間と通液重量の関係は図1のようになり、比較ポリマー1の濾過性が著しく悪いのに対し、ポリマー1の濾過性が良好なことが確認された。
合成例1で得られたポリマー1(中性アルミナ処理品)、比較合成例1で得られた比較ポリマー1(中性アルミナ未処理品)の20質量%PGMEA溶液を調整し、20nmの目開きを持つナイロン製フィルターで濾過を実施したところ、ポリマー1では濾過圧力が50kPaで濾過することが出来たが、比較ポリマー1ではフィルターが閉塞し、圧力を500kPaに上げても、濾液を得ることが出来なかった。
ポリマー1、比較ポリマー1、各種添加剤を下記の表2に示されている組成(()内の単位はkg)で調整し、有機下層膜形成用組成物の製造設備を用いて、10インチサイズで20nmの目開きを持つナイロン製フィルターで濾過することによって有機下層膜形成用組成物(SOL−1、2、比較SOL−1、2)を製造した。
Claims (7)
- ジヒドロキシナフタレン縮合物の製造方法であって、ジヒドロキシナフタレンとして、成分元素中の硫黄元素の含有量が、質量比で100ppm以下のものを用い、該ジヒドロキシナフタレンと縮合剤を酸又は塩基の存在下で縮合させて前記ジヒドロキシナフタレン縮合物を製造するジヒドロキシナフタレン縮合物の製造方法であって、
前記縮合剤として、ホルムアルデヒド、パラホルムアルデヒド、アセトアルデヒド、ベンズアルデヒド、ヒドロキシベンズアルデヒド、又はヒドロキシナフトアルデヒドを用いることを特徴とするジヒドロキシナフタレン縮合物の製造方法。 - 前記縮合剤の使用量が、前記ジヒドロキシナフタレン1モルに対し0.01〜5.0モルであることを特徴とする請求項1に記載のジヒドロキシナフタレン縮合物の製造方法。
- 前記ジヒドロキシナフタレンとして、1,5−ジヒドロキシナフタレン又は2,7−ジヒドロキシナフタレンを用いることを特徴とする請求項1又は請求項2に記載のジヒドロキシナフタレン縮合物の製造方法。
- 前記ジヒドロキシナフタレンとして、成分元素中の硫黄元素の含有量が、質量比で50ppm以下のものを用いることを特徴とする請求項1から請求項3のいずれか一項に記載のジヒドロキシナフタレン縮合物の製造方法。
- ジヒドロキシナフタレン縮合物であって、ジヒドロキシナフタレンと縮合剤の縮合物であり、前記ジヒドロキシナフタレン縮合物に含まれる成分元素中の硫黄元素の含有量が、質量比で100ppm以下であるジヒドロキシナフタレン縮合物であって、
前記縮合剤が、ホルムアルデヒド、パラホルムアルデヒド、アセトアルデヒド、ベンズアルデヒド、ヒドロキシベンズアルデヒド、又はヒドロキシナフトアルデヒドであることを特徴とするジヒドロキシナフタレン縮合物。 - 前記ジヒドロキシナフタレン縮合物の重量平均分子量が、500〜500,000であることを特徴とする請求項5に記載のジヒドロキシナフタレン縮合物。
- 前記ジヒドロキシナフタレンが、1,5−ジヒドロキシナフタレン又は2,7−ジヒドロキシナフタレンであることを特徴とする請求項5又は請求項6に記載のジヒドロキシナフタレン縮合物。
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