IL41174A - Particulate,free-flowing,insoluble swellable polymers and process for preparation - Google Patents

Particulate,free-flowing,insoluble swellable polymers and process for preparation

Info

Publication number
IL41174A
IL41174A IL41174A IL4117472A IL41174A IL 41174 A IL41174 A IL 41174A IL 41174 A IL41174 A IL 41174A IL 4117472 A IL4117472 A IL 4117472A IL 41174 A IL41174 A IL 41174A
Authority
IL
Israel
Prior art keywords
hydrophilic polymer
plant growth
growth medium
inert filler
filler
Prior art date
Application number
IL41174A
Other versions
IL41174A0 (en
Original Assignee
Union Carbide Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US303880A external-priority patent/US3900378A/en
Application filed by Union Carbide Corp filed Critical Union Carbide Corp
Publication of IL41174A0 publication Critical patent/IL41174A0/en
Publication of IL41174A publication Critical patent/IL41174A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
    • A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
    • A01G24/12—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material containing soil minerals
    • A01G24/15—Calcined rock, e.g. perlite, vermiculite or clay aggregates
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
    • A01G24/20—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
    • A01G24/28—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material containing peat, moss or sphagnum
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
    • A01G24/30—Growth substrates; Culture media; Apparatus or methods therefor based on or containing synthetic organic compounds
    • A01G24/35—Growth substrates; Culture media; Apparatus or methods therefor based on or containing synthetic organic compounds containing water-absorbing polymers
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
    • A01G24/40—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure
    • A01G24/42—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure of granular or aggregated structure
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/08—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing solids as carriers or diluents
    • A01N25/10—Macromolecular compounds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/18—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing inorganic materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/20—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing organic materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/40—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing ingredients of undetermined constitution or reaction products thereof, e.g. plant or animal extracts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42—Use of materials characterised by their function or physical properties
    • A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D9/00—Other inorganic fertilisers
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G5/00—Fertilisers characterised by their form
    • C05G5/30—Layered or coated, e.g. dust-preventing coatings
    • C05G5/37—Layered or coated, e.g. dust-preventing coatings layered or coated with a polymer
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G5/00—Fertilisers characterised by their form
    • C05G5/40—Fertilisers incorporated into a matrix
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • C08J3/124—Treatment for improving the free-flowing characteristics
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/205—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/28—Treatment by wave energy or particle radiation
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
    • C09K17/16—Soil-conditioning materials or soil-stabilising materials containing organic compounds only applied in a physical form other than a solution or a grout, e.g. as platelets or granules
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
    • C09K17/18—Prepolymers; Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
    • C09K17/18—Prepolymers; Macromolecular compounds
    • C09K17/20—Vinyl polymers
    • C09K17/22—Polyacrylates; Polymethacrylates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/10—Polymers characterised by the presence of specified groups, e.g. terminal or pendant functional groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/14—Water soluble or water swellable polymers, e.g. aqueous gels
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2371/00—Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers
    • C08J2371/02—Polyalkylene oxides

Abstract

1376091 Plant growth media containing crosslinked polymers UNION CARBIDE CORP 22 Dec 1972 59412/72 Heading C1B [Also in Divisions A5 and C3] Plant growth media and fertilizer compositions comprise free-flowing, water swellable, radiation cross-linked hydrophilic polymers (see Division C3) characterized by high waterretentive properties and a content of inert filler material exemplified by wood flows, wood pulp fluff, tree bark, cellulose flocs, cotton linter floes, nylon flocs, rayon flocs, perlite, diatomaceous earth, talc, clay, fly ash, magnesium silicate, silica, soil, sand, peat moss, vermiculite, gypsum, calcium carbonate, urea, tricalcium phosphate and/or dibasic calcium phosphate. [GB1376091A]

Claims (41)

41174 2 WliAT IS CLAIMED IS :
1. Λ process for the preparation of a f ee-flowing, water swellable hydrophilic polymeilc material in particulate form, said process comprising the steps of: (a) blending 3. mixture of at least one water soluble pulverulent hydrophilic polymer and at least one pulverulent inert filler, a substantial portion of said filler having a particle size less than that of said polymer and present in an amount sufficient to cover a substantial portion of the surface area of said pulverulent polymer, (b) thereafter while said blending is continued, contacting said mixture under thorough agitation with a finely divided spray of water at a rate and in an amount not to exceed that at which the mixture is maintained in a freo- flowing particulate form, and (c) exposing said mixture to ionizing radiation for a period of time to · crosslink said polymer.
2. The process of claim 1 wherein said hydrophilic polymer and said inert filler are blended in step (a) in the dry state.
3. The process of claim 1 wherein said inert filler prior to contact with said hydrophilic polymer in step (a) is blended with a portion of said water in an amount not to exceed that at which the filler is maintained in a free-flowing particulate form.
4. The process of claim 1 wherein the mixture is dried after ste (c) to remove at least some of said water.
5. The process of claim 1 wherein the hydrophilic polymer is poly(alkylene oxide).
6. The process of claim 1 wherein the hydrophilic polymer is poly(ethylene oxide).
7. The process of claim 1 wherein the hydrophilic polymer is a polyacrylamide .
8. The process of claim 1 wherein the hydrophilic polymer is a partially hydrolyzed polyacrylamide.
9. The process of claim 1 wherein the hydrophilic polymer is polyvinyl alcohol.
10. The process of claim 1 wherein the hydrophilic polymer is hydroxyethyl cellulose.
11. The process of claim 1 wherein the hydrophilic polymer is an ammonium polyacrylate .
12. The process of claim 1 wherein the hydrophilic polymer is polymerized hydroxyalkyl acrylate.
13. The process of claim 1 wherein the hydrophilic polymer is polymerized hydroxyalkyl me hacrylate.
14. The process of claim 1 wherein the hydrophilic polymer is selected from the group consisting of polymerized hydroxyalkoxyalkyl acrylates and alkoxyalkyl acrylates.
15. The process of claim 1 wherein the hydrophilic polymer is selected from the group consisting of polymerized hydroxyalkoxyalkyl meth-acrylates and alkoxyalkyl methacrylates .
16. The process of claim 1 wherein the hydrophilic polymer is a polymerized alkylene oxide or poly(alkylene oxide) adduct of acrylate and methacrylate es ers .
17. The process of claim 1 wherein the inert filler is pulverulent wood.
18. . The process of claim 1 wherein the inert filler is pulverulent diatomaceous earth.
19. The process of claim 1. wherein the inert filler is cellulose floe.
20. The process of claim I wherein Lhe inert: filler is cotton 1 inter floe.
21. Th process of claim 1 wherein the inert filler is coal dust.
22. Tie process of claim 1 wherein the inert filler is clay.
23. The process of claim 1 wherein the inert filler is a fertilizer.
24. The process of claim 1 wherein the inert filler is a magnesium silicate.
25. The process of claim 1 wherein reagent grade or technical grade tricalcium phosphate is substituted for at least about 0.5 weight per cent of said filler.
26. A plant growth medium comprising at least one member selected from Che group consisting of soil, sand, peat moss and vermiculite, in admixture material with the hydrophilic polymeric/prepared by the process of claim 1.
27. The plant growth medium of claim 26 injsaid polymeric material wherein the hydrophilic poXylfier l is poly (alkylene oxide).
28. The plant growth madium of claim 26 . in said pol^jeric material wherein the hydrophilic polymer^ s poly(ethylene oxide).
29. The plant growth medium of claim 26 wherein the inert medium is pulverulent wood.
30. The plant growth medium of claim 26 which contains at least one fertilizer.
31. The plant growth medium of claim 26 which contains at least one herbicide,
32. The plant growth medium of claim 26 which contains at least one fungicide.
33. The plant growth medium of claim 26 which contains at least one nematocide.
34. The plant growth medium of claim 26 which contains at least one insecticide.
35. A method for rendering plants resistant to moisture stress which comprises growing said plants in the plant growth medium of claim 26.
36. The method of claim 35 wherein the hydrophilic polymer is poly(ethylene oxide).
37. A disposable absorbent article containing the mixture prepared by the process of claim 1.
38. The disposable absorbent article of claim 37 which is a catamenial device.
39. The disposable absorbent article of claim 37 which is a sanitary napkin.
40. The disposable absorbent article of claim 37 which is a tampon.
41. The disposable absorbent article of claim 37 which is a diaper.
IL41174A 1972-11-06 1972-12-25 Particulate,free-flowing,insoluble swellable polymers and process for preparation IL41174A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US303880A US3900378A (en) 1971-11-01 1972-11-06 Hydrogels from radiation crosslinked blends of hydrophilic polymers and fillers

Publications (2)

Publication Number Publication Date
IL41174A0 IL41174A0 (en) 1973-02-28
IL41174A true IL41174A (en) 1976-04-30

Family

ID=23174096

Family Applications (1)

Application Number Title Priority Date Filing Date
IL41174A IL41174A (en) 1972-11-06 1972-12-25 Particulate,free-flowing,insoluble swellable polymers and process for preparation

Country Status (10)

Country Link
JP (1) JPS521739B2 (en)
BE (1) BE793650A (en)
CA (1) CA982082A (en)
DE (1) DE2264027B2 (en)
FR (1) FR2173934B1 (en)
GB (1) GB1376091A (en)
IL (1) IL41174A (en)
IT (1) IT976277B (en)
NL (1) NL7300423A (en)
ZA (1) ZA729164B (en)

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CA982082A (en) 1976-01-20
DE2264027A1 (en) 1974-07-04
JPS507842A (en) 1975-01-27
IL41174A0 (en) 1973-02-28
IT976277B (en) 1974-08-20
GB1376091A (en) 1974-12-04
DE2264027B2 (en) 1976-05-06
BE793650A (en) 1973-07-03
AU482198A (en) 1974-07-04
JPS521739B2 (en) 1977-01-18
NL7300423A (en) 1974-05-08
ZA729164B (en) 1973-09-26
FR2173934A1 (en) 1973-10-12
FR2173934B1 (en) 1976-05-14

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