EP0178899A2 - Metal cleaning - Google Patents
Metal cleaning Download PDFInfo
- Publication number
- EP0178899A2 EP0178899A2 EP85307405A EP85307405A EP0178899A2 EP 0178899 A2 EP0178899 A2 EP 0178899A2 EP 85307405 A EP85307405 A EP 85307405A EP 85307405 A EP85307405 A EP 85307405A EP 0178899 A2 EP0178899 A2 EP 0178899A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- binders
- residue
- vinyl
- pyrrolidone
- maleic acid
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/37—Polymers
- C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/3769—(Co)polymerised monomers containing nitrogen, e.g. carbonamides, nitriles or amines
- C11D3/3776—Heterocyclic compounds, e.g. lactam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0014—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by incorporation in a layer which is removed with the contaminants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
Definitions
- This invention relates to the cleaning of metals.
- the pattern elements namely patterns and core boxes, are generally manufactured from metals, thermosetting plastics and wood and typically are formed from iron, steel, aluminum, polyurethane, epoxy alloys, kirksite alloy, stainless steel, herbwoods and the like. It is these pattern elements, which repeatedly come into contact with cured resin binder materials, which benefit from the process of the present invention.
- sand molds and sand cores are formed by introducing into an appropriate pattern element a mixture of sand and a resinous binder which, upon curing, forms a rigid sand shape which can then be used to receive and shape molten metal.
- Various resinous binder materials are used to form the sand shapes with the curing or hardening of the resins being accomplished by the use of curing catalysts, e.g_., acid catalysts with acid curable binders or amine catalysts with amine curable binders.
- furan and phenolic-urethane type binders are the most widely used in the foundry art to form rigid sand shapes, although numerous other resinous binder types do find use.
- resinous binders used to form foundry sand cores and molds are furan no-bake binders, phenolic no-bake binders, phenolic urethane-amine binders, phenolic hot box binders, furan hot box binders, furan-sulfur dioxide binders, acrylic-sulfur dioxide binders, epoxy acrylic-sulfur dioxide binders, alkyd oil binders and the like.
- this coating or residue comprises a reaction product of the resinous binder and catalyst used for curing the resin and it may include sand contaminants and reaction products formed by the curing catalysts reacting with the pattern surfaces.
- this coating or residue comprises a reaction product of the resinous binder and catalyst used for curing the resin and it may include sand contaminants and reaction products formed by the curing catalysts reacting with the pattern surfaces.
- build-up of such a residue on the surface of the pattern elements is a problem in the metal foundry art necessitating that periodically this residue be removed from the pattern elements.
- a commonly employed method of cleaning the pattern elements involved subjecting the elements to sand blasting. This cleaning method is not completely satisfactory since it is time-consuming and can cause damage to the surface of the metal, plastic or wood pattern if not carefully conducted.
- High pressure sand blasting presents a potential danger to an operator and this is a further disadvantage, such as the danger of silicosis of the lungs.
- Another object of the invention is to provide a simple and effective method for cleaning metal, plastic and wood surfaces on which there is a residue resulting from contact with a cured resin.
- a further object of the invention is to provide a method for cleaning metal, plastic or wood surfaces, which method does not involve the use of high temperatures, high pressure equipment, strongly corrosive cleaners or aggressive solvents.
- a cleaning composition comprising N-vinyl-2-pyrrolidone/maleic acid copolymer.
- the cleaning composition is preferably applied to the "dirty" metal, plastic or wood surface in the form of a liquid solution by any suitable means, such as by brushing or spraying it thereon or by dipping the dirty surface into the cleaning solution.
- Water is the preferred solvent, although solvents other than water can be used to form the cleaning solution.
- Such solvents include, for example, methanol, ethanol, methyl ethyl ketone, butyl acetone, N-methylpyrrolidone, phenoxyethanol, dimethylformamide and the like.
- the cleaning solution is permitted to dry to a substantially dry film which can be peeled from the treated surface along with the undesired cured resin residue.
- the invention involves a process for cleaning a metal, plastic or wood surface on which there is a residue resulting from contact with a cured resin which comprises applying to said surface a solution of a copolymer of N-vinyl-2-pyrrolidone and maleic acid, drying said solution of N-vinyl-2-pyrrolidone and maleic acid copolymer to form a film, and separating said film with said residue fr ⁇ g said surface.
- N-vinyl-2-pyrrolidone/maleic acid copolymer in the form of an aqueous solution is commercially available from GAF Corporation, New York, N.Y. under the designation Agent CD 260.
- Agent CD 260 United States patent No. 4,424,079 describes the N-vinyl-2-pyrrolidone/maleic.acid copolymer and methods of making it, and the disclosure of that patent is incorporated herein.
- United States patent No. 4,424,079 the 'N-vinyl-2-pyrrolidone/maleic acid copolymer is disclosed as being useful to remove rust from metal surfaces.
- the commercial CD 260 N-vinyl-2-pyrrolidone/maleic acid copolymer is promoted by the supplier thereof as having the ability to "auto-release" from various types of surfaces, including thermoplastics such as high/low density polyethylene, polypropylene, cellulose acetate, rigid/plasticized vinyl, cellulose acetate butyrate, nylon, polymethylmethacrylate, polytetrafluoroethylene, polystyrene, polycarbonate, acrylonitrile butadiene-styrene and polyvinyl chloride, and thermosetting materials such as phenol-formaldehyde, melamine-formaldehyde, alpha cellulose phenol-formaldehyde, polyester, epoxy and silicone.
- thermoplastics such as high/low density polyethylene, polypropylene, cellulose acetate, rigid/plasticized vinyl, cellulose acetate butyrate, nylon, polymethylmethacrylate, polytetrafluoroethylene, polystyrene, polycarbonate,
- the viscosity of the metal cleaning solution can be adjusted for easy application as desired, as described in United States patent No. 4,424,079. Generally, an aqueous solution of copolymer having a viscosity within the range of about 2,000 to 75,000 centipoise is convenient for use.
- the molecular weight of the N-vinyl-2-pyrrolidone/maleic acid copolymer can vary as described in that patent; however, in general, a molecular weight of greater than 15,000 forms better films.
- the cleaning solution is dried to form a peelable solid film. Drying can be accomplished at room temperature in periods of from about 30 to 120 minutes or drying can be accelerated by heating, such as by directing warm air thereon, or by forced air connection.
- Surfactants can be added to improve wetout of the N-vinyl-2-pyrrolidone/ maleic acid copolymer on pattern surfaces containing residual release agents.
- Silica compounds can be added to impfeve film thickness and to make the coating thixotropic.
- a foundry core box having considerable resin build-up or residue on the surfaces was used to demonstrate the cleaning ability of the N-vinyl-pyrrolidone/maleic acid copolymer.
- the residue on the core box resulted from use therein of a furan resin binder and a sulfur dioxide catalyst.
- the residue was a hard black coating ranging from 2 to 4. mils (0.05-0.1mm) thick, which strongly adhered to the box surfaces making core part removal difficult.
- Cores produced in the said core box were water jacket cores for an internal combustion motor head.
- a brush application of an aqueous solution of N-vinyl-pyrrolidone/maleic acid copolymer was applied at a thickness of approximately 20-30 mils.
- the applied solution was allowed to dry for 2 hours at 70° F(21°C).
- the dried coating solution was blown off with an air hose whereupon over 70% of the resinous residue was removed.
- a good, clean core box surface was noted where the polymer treating solution had pulled away the black furan-sulfur dioxide residue.
- a wooden pattern for machine housing castings in which a furan no-bake bonded sand was employed was cleaned in accordance with this invention.
- the wooden pattern had a layer approximately 0.5 to 2 mils (0.01 to 0.05mm) thick of residue which was causing poor surface finish and difficult release of the formed part from the pattern surface.
- a brush application of an aqueous solution of N-vinyl-2-pyrrolidone/maleic acid copolymer was applied approximately 30 mils thick.
- the cleaning composition was allowed to dry for 2 hours, after which over 90% of the residue was removed by blowing the dried cleaner film away with an air hose.
- a cold rolled steel panel was coated with a thin coating of a furan foundry binder, methyl ethyl ketone peroxide and sulfur dioxide.
- a 2 to 4 mil (0.05 to 0.1mm) thick build-up was achieved which duplicates build-up or residue observed on foundry patterns.
- N-vinyl-2-pyrrolidone / maleic acid copolymer in aqueous solution was brush applied to the steel panel. After drying for four hours at ambient temperature, approximately 90% of the build-up was removed by blasting with an air hose.
- a cast iron tensile core box used for curing hot box tensile core specimens was cleaned with a 25% solution of N-vinyl-2-pyrrolidone/maleic acid copolymer cleaning solution.
- the box contained a film of resin build-up from over two weeks processing.
- the cleaning solution was sprayed at about 20-30 mils (0.5 - 0.75mm) thickness on thetcore box and allowed to dry. Over 80% of the build-up was removed when the dried coaling was blown away with an air hose.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Detergent Compositions (AREA)
- Mold Materials And Core Materials (AREA)
- Paints Or Removers (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
- This invention relates to the cleaning of metals.
- As is known, when molten metal is poured into a shaping cavity and permitted to cool, the metal assumes the shape of the cavity as defined by the wall surfaces of the cavity as well as by projecting surfaces extending into or suspended within the cavity. In metal foundries, sand bound by a cured resin to form rigid sand molds or sand cores are used to produce metal products of various shapes. Such foundry molds and cores are, in turn, formed by other "molding" elements which, in the foundry art, are called "patterns" and "core boxes", respectively. Even though the "core box" term is used, the core box is, of course, a pattern or shaping element. Thus, in this application when the term "pattern" is used it is intended to refer to both elements for shaping sand molds as well as to elements for shaping sand cores.
- The pattern elements, namely patterns and core boxes, are generally manufactured from metals, thermosetting plastics and wood and typically are formed from iron, steel, aluminum, polyurethane, epoxy alloys, kirksite alloy, stainless steel, herbwoods and the like. It is these pattern elements, which repeatedly come into contact with cured resin binder materials, which benefit from the process of the present invention.
- In the metal foundry art sand molds and sand cores are formed by introducing into an appropriate pattern element a mixture of sand and a resinous binder which, upon curing, forms a rigid sand shape which can then be used to receive and shape molten metal. Various resinous binder materials are used to form the sand shapes with the curing or hardening of the resins being accomplished by the use of curing catalysts, e.g_., acid catalysts with acid curable binders or amine catalysts with amine curable binders. Perhaps furan and phenolic-urethane type binders are the most widely used in the foundry art to form rigid sand shapes, although numerous other resinous binder types do find use. Representative of resinous binders used to form foundry sand cores and molds are furan no-bake binders, phenolic no-bake binders, phenolic urethane-amine binders, phenolic hot box binders, furan hot box binders, furan-sulfur dioxide binders, acrylic-sulfur dioxide binders, epoxy acrylic-sulfur dioxide binders, alkyd oil binders and the like.
- As a result of repeated use of the pattern elements, a coating or residue builds up on the surfaces thereof. It is speculated that this coating or residue comprises a reaction product of the resinous binder and catalyst used for curing the resin and it may include sand contaminants and reaction products formed by the curing catalysts reacting with the pattern surfaces. In any event, build-up of such a residue on the surface of the pattern elements is a problem in the metal foundry art necessitating that periodically this residue be removed from the pattern elements. Heretofore, a commonly employed method of cleaning the pattern elements involved subjecting the elements to sand blasting. This cleaning method is not completely satisfactory since it is time-consuming and can cause damage to the surface of the metal, plastic or wood pattern if not carefully conducted. High pressure sand blasting presents a potential danger to an operator and this is a further disadvantage, such as the danger of silicosis of the lungs.
- It is therefore a principal object of this invention to provide an improved method for cleaning metal surfaces.
- Another object of the invention is to provide a simple and effective method for cleaning metal, plastic and wood surfaces on which there is a residue resulting from contact with a cured resin.
- A further object of the invention is to provide a method for cleaning metal, plastic or wood surfaces, which method does not involve the use of high temperatures, high pressure equipment, strongly corrosive cleaners or aggressive solvents.
- It has now been found, surprisingly, that the residue deposited on metal, plastic and wood surfaces as a result of contact with a cured resin can be simply and effectively removed by applying thereto a cleaning composition comprising N-vinyl-2-pyrrolidone/maleic acid copolymer. The cleaning composition is preferably applied to the "dirty" metal, plastic or wood surface in the form of a liquid solution by any suitable means, such as by brushing or spraying it thereon or by dipping the dirty surface into the cleaning solution. Water is the preferred solvent, although solvents other than water can be used to form the cleaning solution. Such solvents include, for example, methanol, ethanol, methyl ethyl ketone, butyl acetone, N-methylpyrrolidone, phenoxyethanol, dimethylformamide and the like. The cleaning solution is permitted to dry to a substantially dry film which can be peeled from the treated surface along with the undesired cured resin residue.
- Thus, the invention involves a process for cleaning a metal, plastic or wood surface on which there is a residue resulting from contact with a cured resin which comprises applying to said surface a solution of a copolymer of N-vinyl-2-pyrrolidone and maleic acid, drying said solution of N-vinyl-2-pyrrolidone and maleic acid copolymer to form a film, and separating said film with said residue frαg said surface.
- N-vinyl-2-pyrrolidone/maleic acid copolymer in the form of an aqueous solution is commercially available from GAF Corporation, New York, N.Y. under the designation Agent CD 260. United States patent No. 4,424,079 describes the N-vinyl-2-pyrrolidone/maleic.acid copolymer and methods of making it, and the disclosure of that patent is incorporated herein. In United States patent No. 4,424,079 the 'N-vinyl-2-pyrrolidone/maleic acid copolymer is disclosed as being useful to remove rust from metal surfaces. The commercial CD 260 N-vinyl-2-pyrrolidone/maleic acid copolymer is promoted by the supplier thereof as having the ability to "auto-release" from various types of surfaces, including thermoplastics such as high/low density polyethylene, polypropylene, cellulose acetate, rigid/plasticized vinyl, cellulose acetate butyrate, nylon, polymethylmethacrylate, polytetrafluoroethylene, polystyrene, polycarbonate, acrylonitrile butadiene-styrene and polyvinyl chloride, and thermosetting materials such as phenol-formaldehyde, melamine-formaldehyde, alpha cellulose phenol-formaldehyde, polyester, epoxy and silicone.
- The viscosity of the metal cleaning solution can be adjusted for easy application as desired, as described in United States patent No. 4,424,079. Generally, an aqueous solution of copolymer having a viscosity within the range of about 2,000 to 75,000 centipoise is convenient for use. The molecular weight of the N-vinyl-2-pyrrolidone/maleic acid copolymer can vary as described in that patent; however, in general, a molecular weight of greater than 15,000 forms better films.
- After application, the cleaning solution is dried to form a peelable solid film. Drying can be accomplished at room temperature in periods of from about 30 to 120 minutes or drying can be accelerated by heating, such as by directing warm air thereon, or by forced air connection. Surfactants can be added to improve wetout of the N-vinyl-2-pyrrolidone/ maleic acid copolymer on pattern surfaces containing residual release agents. Silica compounds can be added to impfeve film thickness and to make the coating thixotropic.
- The following examples illustrate the advantages of the present invention.
- A foundry core box having considerable resin build-up or residue on the surfaces was used to demonstrate the cleaning ability of the N-vinyl-pyrrolidone/maleic acid copolymer. The residue on the core box resulted from use therein of a furan resin binder and a sulfur dioxide catalyst. The residue was a hard black coating ranging from 2 to 4. mils (0.05-0.1mm) thick, which strongly adhered to the box surfaces making core part removal difficult. Cores produced in the said core box were water jacket cores for an internal combustion motor head.
- A brush application of an aqueous solution of N-vinyl-pyrrolidone/maleic acid copolymer was applied at a thickness of approximately 20-30 mils. The applied solution was allowed to dry for 2 hours at 70° F(21°C). The dried coating solution was blown off with an air hose whereupon over 70% of the resinous residue was removed. A good, clean core box surface was noted where the polymer treating solution had pulled away the black furan-sulfur dioxide residue.
- A wooden pattern for machine housing castings in which a furan no-bake bonded sand was employed was cleaned in accordance with this invention. The wooden pattern had a layer approximately 0.5 to 2 mils (0.01 to 0.05mm) thick of residue which was causing poor surface finish and difficult release of the formed part from the pattern surface. A brush application of an aqueous solution of N-vinyl-2-pyrrolidone/maleic acid copolymer was applied approximately 30 mils thick. The cleaning composition was allowed to dry for 2 hours, after which over 90% of the residue was removed by blowing the dried cleaner film away with an air hose.
- A cold rolled steel panel was coated with a thin coating of a furan foundry binder, methyl ethyl ketone peroxide and sulfur dioxide. A 2 to 4 mil (0.05 to 0.1mm) thick build-up was achieved which duplicates build-up or residue observed on foundry patterns. N-vinyl-2-pyrrolidone / maleic acid copolymer in aqueous solution was brush applied to the steel panel. After drying for four hours at ambient temperature, approximately 90% of the build-up was removed by blasting with an air hose.
- A cast iron tensile core box used for curing hot box tensile core specimens was cleaned with a 25% solution of N-vinyl-2-pyrrolidone/maleic acid copolymer cleaning solution. The box contained a film of resin build-up from over two weeks processing. The cleaning solution was sprayed at about 20-30 mils (0.5 - 0.75mm) thickness on thetcore box and allowed to dry. Over 80% of the build-up was removed when the dried coaling was blown away with an air hose.
- The effectiveness of the N-vinyl-2-pyrrolidone/ maleic acid copolymer in removing cured resin residues from materials is seen from the above. This discovery that N-vinyl-2-pyrrolidone/maleic acid copolymer effectively removes the residue or coating deposited on surfaces as a result of repeated contact with cured resinous materials was completely surprising and unexpected in view of its reported "auto-release" properties with various plastics.
- Those modifications and equivalents which fall within the spirit of the invention are to be considered a part thereof. Thus, while the invention is particularly advantageous in the foundry art for cleaning surfaces which have been repeatedly contacted with cured resins, it is broadly applicable for other similar cleaning operations where such residues are deposited on metals.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US66111384A | 1984-10-15 | 1984-10-15 | |
US661113 | 2003-09-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0178899A2 true EP0178899A2 (en) | 1986-04-23 |
EP0178899A3 EP0178899A3 (en) | 1987-04-15 |
Family
ID=24652269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85307405A Withdrawn EP0178899A3 (en) | 1984-10-15 | 1985-10-15 | Metal cleaning |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0178899A3 (en) |
JP (1) | JPS61179268A (en) |
CA (1) | CA1229779A (en) |
ES (1) | ES8800625A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0635567A2 (en) * | 1993-07-23 | 1995-01-25 | Reckitt & Colman Inc. | Method and composition for facilitating the removal of soil contaminants from solid surfaces |
EP0681875A1 (en) * | 1994-05-06 | 1995-11-15 | Kajima Corporation | Method for peeling off dirt from wall surface by using peelable polymer membrane |
WO1999023283A1 (en) * | 1997-11-05 | 1999-05-14 | Polyval Manufacturing Limited | Rust remover and preventer |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4200671A (en) * | 1978-05-05 | 1980-04-29 | The Dow Chemical Company | Method for removing paint from a substrate |
US4325744A (en) * | 1980-07-25 | 1982-04-20 | The United States Of America As Represented By The Secretary Of The Navy | Method and composition for cleaning metal surfaces with a film-forming composition |
US4351673A (en) * | 1981-05-22 | 1982-09-28 | Halliburton Company | Method for removing iron sulfide scale from metal surfaces |
US4424079A (en) * | 1982-03-31 | 1984-01-03 | Gaf Corporation | Rust removal process |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5133141A (en) * | 1974-09-14 | 1976-03-22 | Bridgestone Tire Co Ltd | KODANSEIRITSU GOMUSOSEIBUTSU |
JPS51134314A (en) * | 1975-05-17 | 1976-11-20 | Kubota Ltd | Parting paint for wooden patterns |
JPS5295586A (en) * | 1976-02-07 | 1977-08-11 | Fuji Koubunshi Kougiyou Kk | Metal mold releasing agent composition |
JPS59119736A (en) * | 1982-12-24 | 1984-07-11 | Toshiba Corp | Automatic cleaning type molding device |
-
1985
- 1985-10-11 CA CA000492853A patent/CA1229779A/en not_active Expired
- 1985-10-14 JP JP22707885A patent/JPS61179268A/en active Granted
- 1985-10-14 ES ES547837A patent/ES8800625A1/en not_active Expired
- 1985-10-15 EP EP85307405A patent/EP0178899A3/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4200671A (en) * | 1978-05-05 | 1980-04-29 | The Dow Chemical Company | Method for removing paint from a substrate |
US4325744A (en) * | 1980-07-25 | 1982-04-20 | The United States Of America As Represented By The Secretary Of The Navy | Method and composition for cleaning metal surfaces with a film-forming composition |
US4351673A (en) * | 1981-05-22 | 1982-09-28 | Halliburton Company | Method for removing iron sulfide scale from metal surfaces |
US4424079A (en) * | 1982-03-31 | 1984-01-03 | Gaf Corporation | Rust removal process |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0635567A2 (en) * | 1993-07-23 | 1995-01-25 | Reckitt & Colman Inc. | Method and composition for facilitating the removal of soil contaminants from solid surfaces |
EP0635567A3 (en) * | 1993-07-23 | 1996-11-27 | Kodak Ltd | Method and composition for facilitating the removal of soil contaminants from solid surfaces. |
EP0681875A1 (en) * | 1994-05-06 | 1995-11-15 | Kajima Corporation | Method for peeling off dirt from wall surface by using peelable polymer membrane |
US5779811A (en) * | 1994-05-06 | 1998-07-14 | Kajima Corporation | Method for peeling off dirt from wall surface by using peelable polymer membrane |
WO1999023283A1 (en) * | 1997-11-05 | 1999-05-14 | Polyval Manufacturing Limited | Rust remover and preventer |
Also Published As
Publication number | Publication date |
---|---|
JPH0460520B2 (en) | 1992-09-28 |
JPS61179268A (en) | 1986-08-11 |
EP0178899A3 (en) | 1987-04-15 |
CA1229779A (en) | 1987-12-01 |
ES547837A0 (en) | 1987-11-16 |
ES8800625A1 (en) | 1987-11-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4276949B2 (en) | Mold with anti-stick coating | |
CA1109238A (en) | Method and mold for preparing a finished concrete part | |
US4622075A (en) | Metal cleaning | |
US3727666A (en) | Method of casting using a mold having a refractory coating thereon | |
US4532096A (en) | Method of shaping articles using shaping surfaces having release agent coating | |
CA1229779A (en) | Metal cleaning | |
CA2021315C (en) | Plasma removal of unwanted material | |
US6298902B1 (en) | Use of CO2-soluble materials as transient coatings | |
US4854366A (en) | Method of making a moulded article | |
US5904158A (en) | Thermo responsive method of removing cured paint | |
JP2003039440A (en) | Molding mold for forming uneven pattern and its production method | |
US6296718B1 (en) | Environmentally friendly method of paint stripping reject painted parts, with no base metal attack | |
US2378598A (en) | Method of coating | |
US2860947A (en) | Method of casting phenolic resins in a tin-plated mold | |
JPS5944205B2 (en) | How to remove mold deposits | |
JPH0335469Y2 (en) | ||
SU1122396A1 (en) | Separating coating for casting pattern | |
US5736078A (en) | Method for manufacturing uncoated vinyl covering | |
JP3176767B2 (en) | Coating agent | |
JPH025500B2 (en) | ||
CA1180258A (en) | Method for shaping and finishing a workpiece | |
JPH0156857B2 (en) | ||
KR840001704B1 (en) | Molded plastic part | |
JP2003154531A (en) | Method for cleaning molding die with uv and resin molder therefor | |
JPS61199085A (en) | Manufacture of precision casting |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): DE FR GB IT SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): DE FR GB IT SE |
|
17P | Request for examination filed |
Effective date: 19870714 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19880502 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BOGNER, BEN R. |