CA1045743A - Synthetic fiber comprising acrylonitrile-polyvinylalcohol graft copolymer and styrene-acrylonitrile copolymer and process therefore - Google Patents
Synthetic fiber comprising acrylonitrile-polyvinylalcohol graft copolymer and styrene-acrylonitrile copolymer and process thereforeInfo
- Publication number
- CA1045743A CA1045743A CA205,015A CA205015A CA1045743A CA 1045743 A CA1045743 A CA 1045743A CA 205015 A CA205015 A CA 205015A CA 1045743 A CA1045743 A CA 1045743A
- Authority
- CA
- Canada
- Prior art keywords
- weight
- paper
- copolymer
- synthetic
- pulp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 90
- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 90
- 239000012209 synthetic fiber Substances 0.000 title claims abstract description 20
- 229920002994 synthetic fiber Polymers 0.000 title claims abstract description 19
- 229920000578 graft copolymer Polymers 0.000 title claims description 47
- 238000000034 method Methods 0.000 title claims description 38
- 230000008569 process Effects 0.000 title description 4
- 229920002285 poly(styrene-co-acrylonitrile) Polymers 0.000 title 1
- 239000000835 fiber Substances 0.000 claims abstract description 76
- 229920001577 copolymer Polymers 0.000 claims abstract description 52
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 30
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229920000642 polymer Polymers 0.000 claims description 74
- 239000000203 mixture Substances 0.000 claims description 44
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 39
- 229920001131 Pulp (paper) Polymers 0.000 claims description 27
- 238000006116 polymerization reaction Methods 0.000 claims description 26
- 239000002904 solvent Substances 0.000 claims description 22
- 238000009987 spinning Methods 0.000 claims description 21
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 13
- 230000001112 coagulating effect Effects 0.000 claims description 12
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 12
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 229940113088 dimethylacetamide Drugs 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000002166 wet spinning Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 abstract description 4
- 210000001724 microfibril Anatomy 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 132
- 239000000243 solution Substances 0.000 description 84
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 60
- 239000000306 component Substances 0.000 description 34
- 238000010009 beating Methods 0.000 description 27
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 18
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 18
- 239000002002 slurry Substances 0.000 description 18
- 235000019641 whiteness Nutrition 0.000 description 15
- 229920001893 acrylonitrile styrene Polymers 0.000 description 14
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 14
- 239000007864 aqueous solution Substances 0.000 description 11
- 239000000178 monomer Substances 0.000 description 11
- 238000009740 moulding (composite fabrication) Methods 0.000 description 11
- 229940068984 polyvinyl alcohol Drugs 0.000 description 10
- 239000000047 product Substances 0.000 description 9
- 238000003756 stirring Methods 0.000 description 8
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium peroxydisulfate Substances [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 7
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 7
- 206010061592 cardiac fibrillation Diseases 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000007334 copolymerization reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000002600 fibrillogenic effect Effects 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000011259 mixed solution Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2,2'-azo-bis-isobutyronitrile Substances N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 4
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 4
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- ZNBNBTIDJSKEAM-UHFFFAOYSA-N 4-[7-hydroxy-2-[5-[5-[6-hydroxy-6-(hydroxymethyl)-3,5-dimethyloxan-2-yl]-3-methyloxolan-2-yl]-5-methyloxolan-2-yl]-2,8-dimethyl-1,10-dioxaspiro[4.5]decan-9-yl]-2-methyl-3-propanoyloxypentanoic acid Chemical compound C1C(O)C(C)C(C(C)C(OC(=O)CC)C(C)C(O)=O)OC11OC(C)(C2OC(C)(CC2)C2C(CC(O2)C2C(CC(C)C(O)(CO)O2)C)C)CC1 ZNBNBTIDJSKEAM-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 229910000378 hydroxylammonium sulfate Inorganic materials 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000008961 swelling Effects 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- FRQQKWGDKVGLFI-UHFFFAOYSA-N 2-methylundecane-2-thiol Chemical compound CCCCCCCCCC(C)(C)S FRQQKWGDKVGLFI-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 244000144992 flock Species 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002655 kraft paper Substances 0.000 description 2
- 150000002825 nitriles Chemical class 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 238000001226 reprecipitation Methods 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 2
- 235000019345 sodium thiosulphate Nutrition 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- VAZSKTXWXKYQJF-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)OOS([O-])=O VAZSKTXWXKYQJF-UHFFFAOYSA-N 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 238000012661 block copolymerization Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000012662 bulk polymerization Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 229920001600 hydrophobic polymer Polymers 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 229920005787 opaque polymer Polymers 0.000 description 1
- 238000012015 optical character recognition Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Substances [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 1
- CMXPERZAMAQXSF-UHFFFAOYSA-M sodium;1,4-bis(2-ethylhexoxy)-1,4-dioxobutane-2-sulfonate;1,8-dihydroxyanthracene-9,10-dione Chemical compound [Na+].O=C1C2=CC=CC(O)=C2C(=O)C2=C1C=CC=C2O.CCCCC(CC)COC(=O)CC(S([O-])(=O)=O)C(=O)OCC(CC)CCCC CMXPERZAMAQXSF-UHFFFAOYSA-M 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- -1 unreacted PV~ Polymers 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
- 238000004260 weight control Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H5/00—Special paper or cardboard not otherwise provided for
- D21H5/12—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials
- D21H5/20—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of organic non-cellulosic fibres too short for spinning, with or without cellulose fibres
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
- C08L25/12—Copolymers of styrene with unsaturated nitriles
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/56—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polymers of cyclic compounds with one carbon-to-carbon double bond in the side chain
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/003—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Paper (AREA)
- Artificial Filaments (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8046973A JPS5032326B2 (enrdf_load_stackoverflow) | 1973-07-19 | 1973-07-19 | |
| JP8360973A JPS5117608B2 (enrdf_load_stackoverflow) | 1973-07-26 | 1973-07-26 | |
| JP8638473A JPS5145691B2 (enrdf_load_stackoverflow) | 1973-08-02 | 1973-08-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1045743A true CA1045743A (en) | 1979-01-02 |
Family
ID=27303306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA205,015A Expired CA1045743A (en) | 1973-07-19 | 1974-07-18 | Synthetic fiber comprising acrylonitrile-polyvinylalcohol graft copolymer and styrene-acrylonitrile copolymer and process therefore |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3928496A (enrdf_load_stackoverflow) |
| CA (1) | CA1045743A (enrdf_load_stackoverflow) |
| FI (1) | FI219374A7 (enrdf_load_stackoverflow) |
| FR (1) | FR2237993B1 (enrdf_load_stackoverflow) |
| GB (1) | GB1468920A (enrdf_load_stackoverflow) |
| IT (1) | IT1020663B (enrdf_load_stackoverflow) |
| NL (1) | NL7409713A (enrdf_load_stackoverflow) |
| NO (1) | NO742627L (enrdf_load_stackoverflow) |
| SE (1) | SE391351B (enrdf_load_stackoverflow) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5816B2 (ja) * | 1974-09-09 | 1983-01-05 | カンザキセイシ カブシキガイシヤ | セイデンキロクタイ |
| JPS5749059B2 (enrdf_load_stackoverflow) * | 1975-03-03 | 1982-10-20 | ||
| US6171443B1 (en) * | 1990-03-05 | 2001-01-09 | Polyweave International, Llc | Recyclable polymeric synthetic paper and method for its manufacture |
| US5861213A (en) * | 1995-10-18 | 1999-01-19 | Kuraray Co., Ltd. | Fibrillatable fiber of a sea-islands structure |
| CN101111394A (zh) * | 2004-12-17 | 2008-01-23 | C2C许可有限公司 | 通信装置及其分发方法 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3826712A (en) * | 1972-01-18 | 1974-07-30 | Asahi Chemical Ind | Acrylic synthetic paper and method for producing the same acrylic fibers wet spun from a blend of hydrolyzed and unhydrolyzed acrylic polymers having at least 60 % acrylonitriles by weight and paper made from such fibers |
-
1974
- 1974-07-15 US US488486A patent/US3928496A/en not_active Expired - Lifetime
- 1974-07-16 IT IT69257/74A patent/IT1020663B/it active
- 1974-07-18 FR FR7425044A patent/FR2237993B1/fr not_active Expired
- 1974-07-18 NL NL7409713A patent/NL7409713A/xx not_active Application Discontinuation
- 1974-07-18 GB GB3186674A patent/GB1468920A/en not_active Expired
- 1974-07-18 FI FI2193/74A patent/FI219374A7/fi unknown
- 1974-07-18 CA CA205,015A patent/CA1045743A/en not_active Expired
- 1974-07-18 NO NO742627A patent/NO742627L/no unknown
- 1974-07-18 SE SE7409372A patent/SE391351B/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB1468920A (en) | 1977-03-30 |
| SE391351B (sv) | 1977-02-14 |
| SE7409372L (enrdf_load_stackoverflow) | 1975-01-20 |
| DE2434927A1 (de) | 1975-03-13 |
| NL7409713A (nl) | 1975-01-21 |
| US3928496A (en) | 1975-12-23 |
| IT1020663B (it) | 1977-12-30 |
| DE2434927B2 (de) | 1976-07-29 |
| NO742627L (enrdf_load_stackoverflow) | 1975-02-17 |
| FR2237993B1 (enrdf_load_stackoverflow) | 1979-10-12 |
| FI219374A7 (enrdf_load_stackoverflow) | 1975-01-20 |
| FR2237993A1 (enrdf_load_stackoverflow) | 1975-02-14 |
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