SU1069623A3 - Способ получени диамидодиэфиров - Google Patents
Способ получени диамидодиэфиров Download PDFInfo
- Publication number
- SU1069623A3 SU1069623A3 SU711703305A SU1703305A SU1069623A3 SU 1069623 A3 SU1069623 A3 SU 1069623A3 SU 711703305 A SU711703305 A SU 711703305A SU 1703305 A SU1703305 A SU 1703305A SU 1069623 A3 SU1069623 A3 SU 1069623A3
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- product
- radical
- carbon atoms
- mixture
- methyl alcohol
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims 2
- -1 hydrocarbon radical Chemical class 0.000 claims abstract description 10
- 150000004985 diamines Chemical class 0.000 claims abstract description 9
- 125000001931 aliphatic group Chemical group 0.000 claims abstract 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 63
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 45
- 239000000203 mixture Substances 0.000 claims description 16
- 239000003054 catalyst Substances 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims 3
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 claims 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims 1
- 229910052783 alkali metal Inorganic materials 0.000 claims 1
- 150000001340 alkali metals Chemical class 0.000 claims 1
- 125000000217 alkyl group Chemical group 0.000 claims 1
- 125000002947 alkylene group Chemical group 0.000 claims 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims 1
- 229910003460 diamond Inorganic materials 0.000 claims 1
- 239000010432 diamond Substances 0.000 claims 1
- 150000005690 diesters Chemical class 0.000 claims 1
- 230000003993 interaction Effects 0.000 claims 1
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 11
- 238000002360 preparation method Methods 0.000 abstract description 2
- 125000004432 carbon atom Chemical group C* 0.000 abstract 4
- 150000003254 radicals Chemical class 0.000 abstract 3
- 150000005840 aryl radicals Chemical class 0.000 abstract 2
- 239000004215 Carbon black (E152) Substances 0.000 abstract 1
- 125000003118 aryl group Chemical group 0.000 abstract 1
- 229930195733 hydrocarbon Natural products 0.000 abstract 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 abstract 1
- 238000002317 scanning near-field acoustic microscopy Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 32
- WOZVHXUHUFLZGK-UHFFFAOYSA-N dimethyl terephthalate Chemical compound COC(=O)C1=CC=C(C(=O)OC)C=C1 WOZVHXUHUFLZGK-UHFFFAOYSA-N 0.000 description 18
- 239000011541 reaction mixture Substances 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 10
- 238000000921 elemental analysis Methods 0.000 description 10
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 8
- 238000009835 boiling Methods 0.000 description 8
- LRHPLDYGYMQRHN-UHFFFAOYSA-N butyl alcohol Substances CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 6
- 125000003277 amino group Chemical group 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- JILPJDVXYVTZDQ-UHFFFAOYSA-N lithium methoxide Chemical compound [Li+].[O-]C JILPJDVXYVTZDQ-UHFFFAOYSA-N 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 4
- 239000012298 atmosphere Substances 0.000 description 4
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 3
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- SBOJXQVPLKSXOG-UHFFFAOYSA-N o-amino-hydroxylamine Chemical compound NON SBOJXQVPLKSXOG-UHFFFAOYSA-N 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- LQLQDKBJAIILIQ-UHFFFAOYSA-N Dibutyl terephthalate Chemical compound CCCCOC(=O)C1=CC=C(C(=O)OCCCC)C=C1 LQLQDKBJAIILIQ-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 2
- QFTYSVGGYOXFRQ-UHFFFAOYSA-N dodecane-1,12-diamine Chemical compound NCCCCCCCCCCCCN QFTYSVGGYOXFRQ-UHFFFAOYSA-N 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 239000012456 homogeneous solution Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 240000008620 Fagopyrum esculentum Species 0.000 description 1
- 235000009419 Fagopyrum esculentum Nutrition 0.000 description 1
- 102100021792 Gamma-sarcoglycan Human genes 0.000 description 1
- 101000616435 Homo sapiens Gamma-sarcoglycan Proteins 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 240000004713 Pisum sativum Species 0.000 description 1
- 235000010582 Pisum sativum Nutrition 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- MYPLYYMJHXGTSQ-UHFFFAOYSA-N S(=O)(=O)([O-])[O-].[NH4+].C(=O)O.[NH4+] Chemical compound S(=O)(=O)([O-])[O-].[NH4+].C(=O)O.[NH4+] MYPLYYMJHXGTSQ-UHFFFAOYSA-N 0.000 description 1
- OXIKYYJDTWKERT-UHFFFAOYSA-N [4-(aminomethyl)cyclohexyl]methanamine Chemical compound NCC1CCC(CN)CC1 OXIKYYJDTWKERT-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 125000004202 aminomethyl group Chemical group [H]N([H])C([H])([H])* 0.000 description 1
- 239000007853 buffer solution Substances 0.000 description 1
- MXTOFRMIIQQSOE-UHFFFAOYSA-N butane;titanium(4+) Chemical compound [Ti+4].CCC[CH2-].CCC[CH2-].CCC[CH2-].CCC[CH2-] MXTOFRMIIQQSOE-UHFFFAOYSA-N 0.000 description 1
- QCCLAFRLFORCAL-UHFFFAOYSA-N butyl 4-(12-aminododecylcarbamoyl)benzoate Chemical compound CCCCOC(=O)C1=CC=C(C(=O)NCCCCCCCCCCCCN)C=C1 QCCLAFRLFORCAL-UHFFFAOYSA-N 0.000 description 1
- VHRGRCVQAFMJIZ-UHFFFAOYSA-N cadaverine Chemical compound NCCCCCN VHRGRCVQAFMJIZ-UHFFFAOYSA-N 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- BUBWTSJXUHKBBX-UHFFFAOYSA-N ethyl acetate;sodium Chemical compound [Na].CCOC(C)=O BUBWTSJXUHKBBX-UHFFFAOYSA-N 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- ZHDTXTDHBRADLM-UHFFFAOYSA-N hydron;2,3,4,5-tetrahydropyridin-6-amine;chloride Chemical compound Cl.NC1=NCCCC1 ZHDTXTDHBRADLM-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000001048 orange dye Substances 0.000 description 1
- DMCTVRQBJMBEDT-UHFFFAOYSA-N phenol;1,1,1,2-tetrachloroethane Chemical compound ClCC(Cl)(Cl)Cl.OC1=CC=CC=C1 DMCTVRQBJMBEDT-UHFFFAOYSA-N 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- HSFQBFMEWSTNOW-UHFFFAOYSA-N sodium;carbanide Chemical group [CH3-].[Na+] HSFQBFMEWSTNOW-UHFFFAOYSA-N 0.000 description 1
- 239000011877 solvent mixture Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/44—Polyester-amides
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Polyamides (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT3090170 | 1970-10-13 | ||
| IT3090070 | 1970-10-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU1069623A3 true SU1069623A3 (ru) | 1984-01-23 |
Family
ID=26328901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU711703305A SU1069623A3 (ru) | 1970-10-13 | 1971-10-11 | Способ получени диамидодиэфиров |
Country Status (16)
| Country | Link |
|---|---|
| JP (2) | JPS5516132B1 (enExample) |
| BE (1) | BE773738A (enExample) |
| CA (1) | CA991199A (enExample) |
| CH (1) | CH535203A (enExample) |
| CS (1) | CS174167B2 (enExample) |
| DE (1) | DE2150808B2 (enExample) |
| DK (1) | DK150981C (enExample) |
| FR (1) | FR2111288A5 (enExample) |
| GB (1) | GB1365952A (enExample) |
| HU (1) | HU167518B (enExample) |
| LU (1) | LU64050A1 (enExample) |
| NL (1) | NL173952C (enExample) |
| NO (1) | NO136192C (enExample) |
| SE (1) | SE378809B (enExample) |
| SU (1) | SU1069623A3 (enExample) |
| YU (1) | YU36144B (enExample) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1588526A (en) * | 1976-07-21 | 1981-04-23 | Anic Spa | Elastomeric copolyesteramides |
| FR2362180A1 (fr) * | 1976-08-20 | 1978-03-17 | Ato Chimie | Copolyesteramides aliphatiques stables comme produits a mouler |
| IT1123574B (it) * | 1979-09-10 | 1986-04-30 | Anic Spa | Processo per la produzione di diesterediammidi |
| DE3003898A1 (de) * | 1980-02-02 | 1981-08-13 | Dynamit Nobel Ag, 5210 Troisdorf | Verfahren zur acylierung von aminocarbonsaeuren |
| JPS60160816U (ja) * | 1984-04-02 | 1985-10-25 | 廣前 孝明 | 爪楊枝セツト |
| JPS62180419U (enExample) * | 1986-05-09 | 1987-11-16 | ||
| IT1190137B (it) * | 1986-06-20 | 1988-02-10 | Eniricerche Spa | Fibra cava di poliestere ammide e procedimento per la sua preparazione |
| US5852155A (en) * | 1995-03-01 | 1998-12-22 | General Electric Company | Compositions of polyesteramides |
| US5744068A (en) * | 1996-01-24 | 1998-04-28 | General Electric Company | Blends of polyphenylene ethers and polyesteramides |
| US5731389A (en) * | 1996-04-24 | 1998-03-24 | General Electric Company | Blends of polyesters and polyesteramides, optionally with polycarbonates |
| US8685431B2 (en) * | 2004-03-16 | 2014-04-01 | Advanced Cardiovascular Systems, Inc. | Biologically absorbable coatings for implantable devices based on copolymers having ester bonds and methods for fabricating the same |
| EP3033375A1 (en) | 2013-08-16 | 2016-06-22 | DSM IP Assets B.V. | Process for producing a thermoplastic polymer containing segments of a diamide |
| CN109956881A (zh) * | 2017-12-26 | 2019-07-02 | 上海凯赛生物技术研发中心有限公司 | 一种苯甲酰戊二胺及其制备和应用 |
-
1971
- 1971-10-11 SU SU711703305A patent/SU1069623A3/ru active
- 1971-10-11 YU YU258071A patent/YU36144B/xx unknown
- 1971-10-11 BE BE773738A patent/BE773738A/xx not_active IP Right Cessation
- 1971-10-11 CH CH1479671A patent/CH535203A/fr not_active IP Right Cessation
- 1971-10-12 LU LU64050D patent/LU64050A1/xx unknown
- 1971-10-12 CS CS717271A patent/CS174167B2/cs unknown
- 1971-10-12 NO NO374971A patent/NO136192C/no unknown
- 1971-10-12 GB GB4752171A patent/GB1365952A/en not_active Expired
- 1971-10-12 DK DK494071A patent/DK150981C/da active
- 1971-10-12 JP JP7991771A patent/JPS5516132B1/ja active Pending
- 1971-10-12 HU HUSA002256 patent/HU167518B/hu unknown
- 1971-10-12 DE DE19712150808 patent/DE2150808B2/de active Granted
- 1971-10-12 CA CA124,969A patent/CA991199A/en not_active Expired
- 1971-10-13 NL NL7114102A patent/NL173952C/xx not_active IP Right Cessation
- 1971-10-13 SE SE1299971A patent/SE378809B/xx unknown
- 1971-10-13 FR FR7136694A patent/FR2111288A5/fr not_active Expired
-
1978
- 1978-05-16 JP JP5725078A patent/JPS53149921A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS53149921A (en) | 1978-12-27 |
| HU167518B (enExample) | 1975-10-28 |
| DE2150808A1 (de) | 1972-04-20 |
| YU258071A (en) | 1981-04-30 |
| DE2150808B2 (de) | 1978-08-10 |
| YU36144B (en) | 1982-02-25 |
| DK150981C (da) | 1988-02-22 |
| GB1365952A (en) | 1974-09-04 |
| CS174167B2 (enExample) | 1977-03-31 |
| JPS5730097B2 (enExample) | 1982-06-26 |
| NL7114102A (enExample) | 1972-04-17 |
| NL173952B (nl) | 1983-11-01 |
| DE2150808C3 (enExample) | 1979-04-12 |
| CA991199A (en) | 1976-06-15 |
| BE773738A (fr) | 1972-01-31 |
| AU3444971A (en) | 1973-04-19 |
| DK150981B (da) | 1987-10-05 |
| SE378809B (enExample) | 1975-09-15 |
| JPS5516132B1 (enExample) | 1980-04-30 |
| FR2111288A5 (enExample) | 1972-06-02 |
| LU64050A1 (enExample) | 1972-04-21 |
| NO136192C (no) | 1977-08-03 |
| NO136192B (enExample) | 1977-04-25 |
| NL173952C (nl) | 1984-04-02 |
| CH535203A (fr) | 1973-03-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| SU1069623A3 (ru) | Способ получени диамидодиэфиров | |
| US2130947A (en) | Diamine-dicarboxylic acid salts and process of preparing same | |
| US2163636A (en) | Process for preparing linear condensation polyamides | |
| US5677417A (en) | Tetraaroxyperylene-3,4,9,10-tetracarboxylic polyimides | |
| JPS63234002A (ja) | メタクリルイミド単位含有メタクリル樹脂組成物およびその製法 | |
| CN101857805A (zh) | 一类p-n系阻燃剂及其合成方法 | |
| JPS5826749B2 (ja) | Ｎ−ヒドロキシアルキルトリメリット酸イミドの製造法 | |
| Nakata et al. | Preparation of aromatic copolyamides containing regularly placed 1, 6‐hexamethylenediamine units | |
| DE1795541C2 (de) | Poly-(p-benzamid), Verfahren zu seiner Herstellung und seine Verwendung | |
| US3304328A (en) | Preparation of acetoacetarylamides | |
| US4628077A (en) | Preparation of polyamide with catalyst comprising transition metal attached to a ligand which contains electron withdrawing groups | |
| DE69835075T2 (de) | Verfahren zur Herstellung von Polybenzazol | |
| US2572560A (en) | Copolymers of acrylonitrile and quaternary ammonium salts containing polymerizable vinyl substituents | |
| DE1916175A1 (de) | Copolymerisierbare Farbstoffe der Phthalocyaningruppe und die aus solchen Farbstoffenerhaltenen Polymeren | |
| US2659713A (en) | Process for preparing linear polyamides | |
| US3825586A (en) | Process for enriching trans-trans salts of bis(4-aminocyclohexyl)methane and 1,12-dodecanedioic acid | |
| US2416738A (en) | Process for preparation of nu-substituted amides of beta-keto-carboxylic acids | |
| Liaw et al. | Synthesis and characterization of norbornane‐containing cardo polyamides | |
| US4952668A (en) | Process for the production of polyethyleneterephthalate from dimethylterephthalate | |
| CN101016275B (zh) | 5-氨基-6-羟基-2-(对羧基苯基)苯并噁唑盐的合成方法 | |
| DE1916012C3 (de) | Emkondensierbare Tetrahydrotetra azaporphinfarbstoffe | |
| Kurihara et al. | Cyclopolycondensations. IV. Investigation of the polymerization mechanism of aromatic diaminodicarboxylic acid in polyphosphoric acid and the thermal stability of aromatic polyamide amino acids | |
| JP3475754B2 (ja) | 新規なポリイミド前駆体、ポリイミドおよびその製造法 | |
| CN118754819B (zh) | 一类端胺基六元脂环酰胺单体及交替型共聚脂环族共聚聚酰胺的制备方法 | |
| Russo et al. | Direct synthesis of aromatic polyamides |