CA1061960A - Durable press process - Google Patents
Durable press processInfo
- Publication number
- CA1061960A CA1061960A CA230,296A CA230296A CA1061960A CA 1061960 A CA1061960 A CA 1061960A CA 230296 A CA230296 A CA 230296A CA 1061960 A CA1061960 A CA 1061960A
- Authority
- CA
- Canada
- Prior art keywords
- fabric
- formaldehyde
- catalyst
- acid
- weight
- 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
- 238000000034 method Methods 0.000 title claims abstract description 65
- 230000008569 process Effects 0.000 title claims abstract description 56
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 257
- 239000004744 fabric Substances 0.000 claims abstract description 90
- 238000004132 cross linking Methods 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 14
- 239000007864 aqueous solution Substances 0.000 claims abstract description 11
- 229920003043 Cellulose fiber Polymers 0.000 claims abstract description 9
- 229920002678 cellulose Polymers 0.000 claims abstract description 8
- 239000001913 cellulose Substances 0.000 claims abstract description 8
- 230000037303 wrinkles Effects 0.000 claims abstract description 8
- 150000003839 salts Chemical class 0.000 claims abstract description 7
- 229960004279 formaldehyde Drugs 0.000 claims description 83
- 235000019256 formaldehyde Nutrition 0.000 claims description 83
- 239000003054 catalyst Substances 0.000 claims description 69
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 34
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 17
- 229920000742 Cotton Polymers 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- -1 bi-fluorides Chemical class 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 229920000728 polyester Polymers 0.000 claims description 5
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- 235000011007 phosphoric acid Nutrition 0.000 claims description 4
- WWHZEXDIQCJXSV-UHFFFAOYSA-N aluminum;trihypochlorite Chemical compound [Al+3].Cl[O-].Cl[O-].Cl[O-] WWHZEXDIQCJXSV-UHFFFAOYSA-N 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 150000007513 acids Chemical class 0.000 claims description 2
- 239000001361 adipic acid Substances 0.000 claims description 2
- 235000011037 adipic acid Nutrition 0.000 claims description 2
- 229910001617 alkaline earth metal chloride Inorganic materials 0.000 claims description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims description 2
- 150000002823 nitrates Chemical class 0.000 claims description 2
- 235000021317 phosphate Nutrition 0.000 claims description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims 3
- 150000003842 bromide salts Chemical class 0.000 claims 1
- 235000015165 citric acid Nutrition 0.000 claims 1
- FMXLGOWFNZLJQK-UHFFFAOYSA-N hypochlorous acid;zirconium Chemical class [Zr].ClO FMXLGOWFNZLJQK-UHFFFAOYSA-N 0.000 claims 1
- 235000006408 oxalic acid Nutrition 0.000 claims 1
- 239000011973 solid acid Substances 0.000 claims 1
- 238000011282 treatment Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 6
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 6
- 239000003377 acid catalyst Substances 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- 229930040373 Paraformaldehyde Natural products 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000004816 latex Substances 0.000 description 3
- 229920000126 latex Polymers 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 229910018626 Al(OH) Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229920002866 paraformaldehyde Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000013020 steam cleaning Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- 244000198134 Agave sisalana Species 0.000 description 1
- 240000008564 Boehmeria nivea Species 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 240000000491 Corchorus aestuans Species 0.000 description 1
- 235000011777 Corchorus aestuans Nutrition 0.000 description 1
- 235000010862 Corchorus capsularis Nutrition 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- 101000800760 Naja oxiana Short neurotoxin 1 Proteins 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000005250 alkyl acrylate group Chemical group 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001649 bromium compounds Chemical class 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 229940000425 combination drug Drugs 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000002844 continuous effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- LVYZJEPLMYTTGH-UHFFFAOYSA-H dialuminum chloride pentahydroxide dihydrate Chemical compound [Cl-].[Al+3].[OH-].[OH-].[Al+3].[OH-].[OH-].[OH-].O.O LVYZJEPLMYTTGH-UHFFFAOYSA-H 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000002979 fabric softener Substances 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 235000011087 fumaric acid Nutrition 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004224 protection Effects 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004627 regenerated cellulose Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011949 solid catalyst Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 235000016804 zinc Nutrition 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/12—Aldehydes; Ketones
- D06M13/127—Mono-aldehydes, e.g. formaldehyde; Monoketones
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/486,168 US3960482A (en) | 1974-07-05 | 1974-07-05 | Durable press process employing high mositure content fabrics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1061960A true CA1061960A (en) | 1979-09-11 |
Family
ID=23930878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA230,296A Expired CA1061960A (en) | 1974-07-05 | 1975-06-27 | Durable press process |
Country Status (7)
| Country | Link |
|---|---|
| US (2) | US3960482A (OSRAM) |
| JP (1) | JPS5149998A (OSRAM) |
| CA (1) | CA1061960A (OSRAM) |
| DE (1) | DE2530038A1 (OSRAM) |
| FR (1) | FR2277181A1 (OSRAM) |
| GB (1) | GB1498856A (OSRAM) |
| IT (1) | IT1039646B (OSRAM) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3960482A (en) * | 1974-07-05 | 1976-06-01 | The Strike Corporation | Durable press process employing high mositure content fabrics |
| CA1061961A (en) * | 1974-11-18 | 1979-09-11 | Strike Corporation (The) | Durable press process |
| US4152198A (en) * | 1978-02-15 | 1979-05-01 | The United States Of America As Represented By The Secretary Of Agriculture | Isopropenyl ester sized paper and method for producing same |
| US4396390A (en) * | 1981-09-04 | 1983-08-02 | Springs Mills, Inc. | Aqueous formaldehyde textile finishing process |
| US4447241A (en) * | 1982-04-12 | 1984-05-08 | Springs Industries, Inc. | Oxidative afterwash treatment for crease resisting fabrics |
| US5376144A (en) * | 1991-01-23 | 1994-12-27 | American Laundry Machinery, Inc. | Process for treating cellulosic fiber-containing fabric |
| US5320873A (en) * | 1991-08-29 | 1994-06-14 | American Laundry Machinery, Inc. | Process and apparatus for treating cellulosic fiber-containing fabric to improve durable press and shrinkage resistance |
| US6074964A (en) * | 1995-12-19 | 2000-06-13 | Toray Industries, Inc. | Fabric and a production process therefor |
| US5981739A (en) | 1996-09-26 | 1999-11-09 | Bp Amoco Corporation | Polyanhydride crosslinked fibrous cellulosic products and process for their preparation |
| US6375685B2 (en) * | 1997-05-13 | 2002-04-23 | The Procter & Gamble Company | Textile finishing process |
| US5885303A (en) | 1997-05-13 | 1999-03-23 | American Laundry Machinery Incorporated | Durable press/wrinkle-free process |
| US6511928B2 (en) * | 1998-09-30 | 2003-01-28 | The Procter & Gamble Company | Rayon fabric with substantial shrink-resistant properties |
| US6121167A (en) * | 1997-08-22 | 2000-09-19 | Okamoto; Hiroharu | Moisture-controlled curing durable press process |
| US6565612B2 (en) | 1998-09-30 | 2003-05-20 | The Procter & Gamble Company | Shrink resistant rayon fabrics |
| US7169293B2 (en) * | 1999-08-20 | 2007-01-30 | Uop Llc | Controllable space velocity reactor and process |
| US6645256B2 (en) | 2001-04-04 | 2003-11-11 | Healthtex Apparel Corp. | Polymer grafted cotton |
| US6645255B2 (en) | 2001-04-04 | 2003-11-11 | Healthtex Apparel Corp. | Polymer-grafted stretchable cotton |
| US6638319B2 (en) | 2001-04-04 | 2003-10-28 | Healthtex Apparel Corp. | Polymer for printed cotton |
| US6989035B2 (en) * | 2001-10-18 | 2006-01-24 | The Procter & Gamble Company | Textile finishing composition and methods for using same |
| US6841198B2 (en) * | 2001-10-18 | 2005-01-11 | Strike Investments, Llc | Durable press treatment of fabric |
| CN1158950C (zh) | 2001-10-18 | 2004-07-28 | 广东溢达纺织有限公司 | 衬衫缝骨的抗皱整理方法 |
| US7008457B2 (en) * | 2001-10-18 | 2006-03-07 | Mark Robert Sivik | Textile finishing composition and methods for using same |
| US7144431B2 (en) * | 2001-10-18 | 2006-12-05 | The Procter & Gamble Company | Textile finishing composition and methods for using same |
| US7169742B2 (en) * | 2001-10-18 | 2007-01-30 | The Procter & Gamble Company | Process for the manufacture of polycarboxylic acids using phosphorous containing reducing agents |
| US7018422B2 (en) | 2001-10-18 | 2006-03-28 | Robb Richard Gardner | Shrink resistant and wrinkle free textiles |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA897363A (en) * | 1972-04-11 | W. Wilson Katherine | Formaldehyde cure of cellulosic fibers using a solid catalyst | |
| US2311080A (en) * | 1940-11-08 | 1943-02-16 | Du Pont | Textile treatment |
| US2870041A (en) * | 1958-06-02 | 1959-01-20 | West Point Mfg Co | Process for preventing aldehyde odors |
| NL247426A (OSRAM) * | 1958-09-24 | |||
| BE600787A (OSRAM) * | 1958-12-24 | |||
| US3138802A (en) * | 1962-05-25 | 1964-06-30 | Cotton Producers Inst Of The N | Process for imparting durable creases, wrinkle resistance and shape retention to cellulosic textile articles |
| US3264054A (en) * | 1963-02-08 | 1966-08-02 | Robert M Reinhardt | Process for crosslinking cellulosic textile and paper materials with gaseous formaldehyde |
| US3472606A (en) * | 1965-11-15 | 1969-10-14 | Cotton Producers Inst | Two-component wet fixation process for imparting durable press to cellulosecontaining materials |
| CH1438269D (OSRAM) * | 1968-09-24 | |||
| US3706526A (en) * | 1971-12-06 | 1972-12-19 | Cotton Inc | Process for treating cellulosic material with formaldehyde and sulfur dioxide |
| US3960483A (en) * | 1974-07-05 | 1976-06-01 | The Strike Corporation | Durable press process employing alkyl sulfonic or sulfuric acid |
| US3960482A (en) * | 1974-07-05 | 1976-06-01 | The Strike Corporation | Durable press process employing high mositure content fabrics |
-
1974
- 1974-07-05 US US05/486,168 patent/US3960482A/en not_active Expired - Lifetime
-
1975
- 1975-06-27 CA CA230,296A patent/CA1061960A/en not_active Expired
- 1975-07-01 GB GB27724/75A patent/GB1498856A/en not_active Expired
- 1975-07-04 JP JP50082642A patent/JPS5149998A/ja active Pending
- 1975-07-04 IT IT25110/75A patent/IT1039646B/it active
- 1975-07-04 FR FR7521158A patent/FR2277181A1/fr active Granted
- 1975-07-04 DE DE19752530038 patent/DE2530038A1/de not_active Withdrawn
-
1976
- 1976-04-14 US US05/676,815 patent/US4067688A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5149998A (en) | 1976-04-30 |
| FR2277181B1 (OSRAM) | 1982-01-15 |
| US3960482A (en) | 1976-06-01 |
| DE2530038A1 (de) | 1976-01-22 |
| IT1039646B (it) | 1979-12-10 |
| FR2277181A1 (fr) | 1976-01-30 |
| US4067688A (en) | 1978-01-10 |
| GB1498856A (en) | 1978-01-25 |
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