JP2006214013A - ゴム補強用繊維の製造方法 - Google Patents
ゴム補強用繊維の製造方法 Download PDFInfo
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- JP2006214013A JP2006214013A JP2005025138A JP2005025138A JP2006214013A JP 2006214013 A JP2006214013 A JP 2006214013A JP 2005025138 A JP2005025138 A JP 2005025138A JP 2005025138 A JP2005025138 A JP 2005025138A JP 2006214013 A JP2006214013 A JP 2006214013A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000012783 reinforcing fiber Substances 0.000 title claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- 229920001971 elastomer Polymers 0.000 claims abstract description 33
- 239000005060 rubber Substances 0.000 claims abstract description 32
- 125000003504 2-oxazolinyl group Chemical group O1C(=NCC1)* 0.000 claims abstract description 31
- 150000001875 compounds Chemical class 0.000 claims abstract description 28
- 239000007787 solid Substances 0.000 claims abstract description 25
- 229920002994 synthetic fiber Polymers 0.000 claims abstract description 18
- 239000012209 synthetic fiber Substances 0.000 claims abstract description 18
- 229920002725 thermoplastic elastomer Polymers 0.000 claims abstract description 15
- 229920001577 copolymer Polymers 0.000 claims abstract description 7
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000005062 Polybutadiene Substances 0.000 claims abstract description 5
- 229920002857 polybutadiene Polymers 0.000 claims abstract description 5
- 239000004814 polyurethane Substances 0.000 claims abstract description 5
- 229920002635 polyurethane Polymers 0.000 claims abstract description 5
- 125000003277 amino group Chemical group 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 23
- 229920000126 latex Polymers 0.000 claims description 18
- 239000012948 isocyanate Substances 0.000 claims description 8
- 150000002513 isocyanates Chemical class 0.000 claims description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000004593 Epoxy Substances 0.000 abstract description 4
- 125000004356 hydroxy functional group Chemical group O* 0.000 abstract 1
- -1 polyparaphenylene terephthalamide Polymers 0.000 description 11
- 239000004816 latex Substances 0.000 description 10
- 230000007423 decrease Effects 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 7
- 125000000524 functional group Chemical group 0.000 description 7
- 229920000728 polyester Polymers 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- 239000005056 polyisocyanate Substances 0.000 description 6
- 229920001228 polyisocyanate Polymers 0.000 description 6
- 150000001412 amines Chemical class 0.000 description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 4
- 239000004760 aramid Substances 0.000 description 4
- 229920003235 aromatic polyamide Polymers 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 4
- 244000043261 Hevea brasiliensis Species 0.000 description 3
- 239000007983 Tris buffer Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 229920003052 natural elastomer Polymers 0.000 description 3
- 229920001194 natural rubber Polymers 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 3
- RMVRSNDYEFQCLF-UHFFFAOYSA-N thiophenol Chemical compound SC1=CC=CC=C1 RMVRSNDYEFQCLF-UHFFFAOYSA-N 0.000 description 3
- IMSODMZESSGVBE-UHFFFAOYSA-N 2-Oxazoline Chemical group C1CN=CO1 IMSODMZESSGVBE-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 125000003368 amide group Chemical group 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 239000002981 blocking agent Substances 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- VEZUQRBDRNJBJY-UHFFFAOYSA-N cyclohexanone oxime Chemical compound ON=C1CCCCC1 VEZUQRBDRNJBJY-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 2
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229960001755 resorcinol Drugs 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- DNIAPMSPPWPWGF-VKHMYHEASA-N (+)-propylene glycol Chemical compound C[C@H](O)CO DNIAPMSPPWPWGF-VKHMYHEASA-N 0.000 description 1
- YPFDHNVEDLHUCE-UHFFFAOYSA-N 1,3-propanediol Substances OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 1
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 1
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical compound C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 description 1
- SDXAWLJRERMRKF-UHFFFAOYSA-N 3,5-dimethyl-1h-pyrazole Chemical compound CC=1C=C(C)NN=1 SDXAWLJRERMRKF-UHFFFAOYSA-N 0.000 description 1
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 1
- VPWNQTHUCYMVMZ-UHFFFAOYSA-N 4,4'-sulfonyldiphenol Chemical class C1=CC(O)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 VPWNQTHUCYMVMZ-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 229930185605 Bisphenol Natural products 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- QORUGOXNWQUALA-UHFFFAOYSA-N N=C=O.N=C=O.N=C=O.C1=CC=C(C(C2=CC=CC=C2)C2=CC=CC=C2)C=C1 Chemical compound N=C=O.N=C=O.N=C=O.C1=CC=C(C(C2=CC=CC=C2)C2=CC=CC=C2)C=C1 QORUGOXNWQUALA-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 229920000538 Poly[(phenyl isocyanate)-co-formaldehyde] Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- WTKZEGDFNFYCGP-UHFFFAOYSA-N Pyrazole Chemical compound C=1C=NNC=1 WTKZEGDFNFYCGP-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- PXAJQJMDEXJWFB-UHFFFAOYSA-N acetone oxime Chemical compound CC(C)=NO PXAJQJMDEXJWFB-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229930003836 cresol Natural products 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 150000002016 disaccharides Chemical class 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 125000000623 heterocyclic group Chemical group 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
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 1
- 150000002772 monosaccharides Chemical class 0.000 description 1
- WHIVNJATOVLWBW-UHFFFAOYSA-N n-butan-2-ylidenehydroxylamine Chemical compound CCC(C)=NO WHIVNJATOVLWBW-UHFFFAOYSA-N 0.000 description 1
- KYTZHLUVELPASH-UHFFFAOYSA-N naphthalene-1,2-dicarboxylic acid Chemical compound C1=CC=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 KYTZHLUVELPASH-UHFFFAOYSA-N 0.000 description 1
- 229920006173 natural rubber latex Polymers 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 150000002923 oximes Chemical class 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 125000005543 phthalimide group Chemical class 0.000 description 1
- XUWHAWMETYGRKB-UHFFFAOYSA-N piperidin-2-one Chemical compound O=C1CCCCN1 XUWHAWMETYGRKB-UHFFFAOYSA-N 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000166 polytrimethylene carbonate Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229920003987 resole Polymers 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- MHSKRLJMQQNJNC-UHFFFAOYSA-N terephthalamide Chemical compound NC(=O)C1=CC=C(C(N)=O)C=C1 MHSKRLJMQQNJNC-UHFFFAOYSA-N 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Landscapes
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
【解決手段】合成繊維を、オキサゾリン基を有する化合物を含む前処理剤で処理し、ついで熱可塑性エラストマーを含む後処理剤で処理することを特徴とする。さらにはオキサゾリン基を有する化合物の、オキサゾリン基1モル当たりのグラム量であるオキサゾリン基当量が600g・solid/当量以下であることや、オキサゾリン基を有する化合物が水溶性であること、熱可塑性エラストマーが、ハードセグメントにフェノール基、ヒドロキシル基、アミノ基のいずれか一つの基を有することや、ポリブタジエンとポリウレタンとの共重合物であることが好ましい。
【選択図】なし
Description
処理コードとゴムとの接着力を示すものである。天然ゴムを主成分とするカーカス配合の未加硫ゴムシート表層近くに7本のコードを埋め、150℃の温度で、30分間、50kg/cm2のプレス圧力(初期値)、又は180℃の温度で40分間、50kg/cm2のプレス圧力(耐熱値)で加硫し、次いで、両端のコードおよび1本おきにコードを残し3本のコードをゴムシート面に対し90度の方向へ200mm/分の速度で剥離するのに要した力をN/3本で示したものである。
処理コードがゴム中で劣化する度合いを評価するものである。天然ゴムを主成分とするカーカス配合の未加硫ゴムシート表層近くに7本のコードを埋め、150℃の温度で、30分間、50kg/cm2のプレス圧力で加硫を行い、コードをゴム中から取り出した後に強力を測定し、初期強力とする。そして、同様にして180℃の温度で60分間、50kg/cm2のプレス圧力で加硫を行い、コードをゴム中から取り出した後に強力を測定し、劣化強力とする。ゴム中耐熱強力保持率は、劣化強力を初期強力で割って算出した残存強力の割合で示した。
前処理剤としてブロックイソシアネート(明成化学工業(株)製NBP873)、オキサゾリン化合物(日本触媒(株)製WS700、オキサゾリン当量220g・solid/eq、水溶性)、Vpラテックスの固体成分を100:40:160で混合し、全体の固体成分濃度を10重量%とした前処理剤を作成した。
前処理剤にオキサゾリン化合物を含まない以外は実施例1と同様の処理を行った。結果を表1に併せて示す。
後処理剤にオキサゾリン基を有する化合物を固体成分中での含有率が15重量%となるように添加した以外は、比較例1と同様の処理を行った。結果を表1に併せて示す。
Claims (7)
- 合成繊維を、オキサゾリン基を有する化合物を含む前処理剤で処理し、ついで熱可塑性エラストマーを含む後処理剤で処理することを特徴とするゴム補強用繊維の製造方法。
- オキサゾリン基を有する化合物の、オキサゾリン基1モル当たりのグラム量であるオキサゾリン基当量が600g・solid/当量以下である請求項1記載のゴム補強用繊維の製造方法。
- オキサゾリン基を有する化合物が水溶性である請求項1または2記載のゴム補強用繊維の製造方法。
- 熱可塑性エラストマーが、ハードセグメントにフェノール基、ヒドロキシル基、アミノ基のいずれか一つの基を有する請求項1記載のゴム補強用繊維の製造方法。
- 熱可塑性エラストマーがポリブタジエンとポリウレタンとの共重合物である請求項1記載のゴム補強用繊維の製造方法。
- 前処理剤が、ブロックイソシアネートとゴムラテックスを含有する請求項1記載のゴム補強用繊維の製造方法。
- ブロックイソシアネートが、ブロックされたイソシアネート成分を1分子中に3以上有するものである請求項6記載のゴム補強用繊維の製造方法。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2017133115A (ja) * | 2016-01-25 | 2017-08-03 | 帝人株式会社 | 蓄熱性難燃布帛およびその製造方法および繊維製品 |
WO2020129939A1 (ja) * | 2018-12-20 | 2020-06-25 | 帝人フロンティア株式会社 | ゴム補強用繊維の製造方法 |
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JPS5413590A (en) * | 1977-07-01 | 1979-02-01 | Asahi Chem Ind Co Ltd | Improvement in adhesiveness of synthetic fiber material for reinforcing elastomers |
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JP2005089929A (ja) * | 2003-09-19 | 2005-04-07 | Teijin Techno Products Ltd | ゴム補強用繊維の処理方法 |
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2005
- 2005-02-01 JP JP2005025138A patent/JP4533765B2/ja active Active
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Publication number | Priority date | Publication date | Assignee | Title |
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JPS5413590A (en) * | 1977-07-01 | 1979-02-01 | Asahi Chem Ind Co Ltd | Improvement in adhesiveness of synthetic fiber material for reinforcing elastomers |
JPH1046475A (ja) * | 1996-07-25 | 1998-02-17 | Teijin Ltd | ポリエステル繊維の処理方法 |
JP2004316027A (ja) * | 2003-04-17 | 2004-11-11 | Teijin Techno Products Ltd | 繊維補強ゴムホース |
JP2005089929A (ja) * | 2003-09-19 | 2005-04-07 | Teijin Techno Products Ltd | ゴム補強用繊維の処理方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2017133115A (ja) * | 2016-01-25 | 2017-08-03 | 帝人株式会社 | 蓄熱性難燃布帛およびその製造方法および繊維製品 |
WO2020129939A1 (ja) * | 2018-12-20 | 2020-06-25 | 帝人フロンティア株式会社 | ゴム補強用繊維の製造方法 |
US20220073687A1 (en) * | 2018-12-20 | 2022-03-10 | Teijin Frontier Co., Ltd. | Method for producing fiber for reinforcing rubber |
US11939437B2 (en) * | 2018-12-20 | 2024-03-26 | Teijin Frontier Co., Ltd. | Method for producing fiber for reinforcing rubber |
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