CA1258998A - Soluble protective film - Google Patents
Soluble protective filmInfo
- Publication number
- CA1258998A CA1258998A CA000450481A CA450481A CA1258998A CA 1258998 A CA1258998 A CA 1258998A CA 000450481 A CA000450481 A CA 000450481A CA 450481 A CA450481 A CA 450481A CA 1258998 A CA1258998 A CA 1258998A
- Authority
- CA
- Canada
- Prior art keywords
- polymer
- film
- polyvinylpyrrolidone
- group
- glass
- 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
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- Laminated Bodies (AREA)
Abstract
A method is disclosed for temporarily protecting the surface of a substrate being processed, fabricated or handled by applying to the surface a protective film of a soluble polymer.
Description
.~5&~998 SOLIJBLE PROTECTIVE FILM
Background of the Invention The present invention relates generally to the art of protecting glass surfaces, and more particularly to the art of protecting glass sur-faces with removable protective films.
U.S. Patent ~o. 4,263,371 to Franz discloses a method for reduc-ing the surface energy of a glass article by chemisorption of an alkyltin compound. The tin-functional moiety bonds to the glass surface, while the organic moiety is oriented outward from the glass to provide a low energy surface layer which results in low friction, low chemical reactivity, and repellency of water, dirt and glass chips.
U.S. Patent No. 4,276,350 to Franz discloses a method for reducing the reactivity of a glass surface with a fluorocarbon. The method involves adsorbing multivalent metal cations at the glass surface to provide anchor-ing sites for the chemisorption of otherwise nonreactive fluorocarbons.
The resulting fluorocarbon treated glass surface is repellent to both water and organic solvents.
~ Both of the above references teach protecting a glass surface by means of a treatment which reacts with and becomes incorporated onto the glass surface. In some instances, a removable protective layar is desirable.
For exampIe, when glass sheets and plastic interlayers are laminated in an oil autoclave to produce safety windshields, removal of oil residue from the glass surfaces currently requires extensive multiple cleaning steps using detergent washes and hot water rinsés, as well as high-velocity blow-off drying. In accordance with the present invention, a water soluble, but ~Z~8~9~
oil insoluble, protective film is applied to the exposed glass surfaces prior to oil autoclave lamination Thereafter, oil residue, as well as t'ne protective film, may be removed by a single hot water rinse.
A water soluble polymer protective film in accordance with the present invention may be usefully employed in a wide variety of applications.
When applied to a clean &lass surface prior to fabricating processes, a water soluble polymer protective film of the present invention minimizes handling marks, such as fin&erprints and roll or belt marks, as well as adherence of dirt and debris. After fabrication, handling and installation, the protective film is easily washed off leaving a clean, unmarked glass surface.
Summary of the Invention A temporary protective film is applied to a substrate surface by applying a solution of a soluble film-forming polymer to the surface and evaporating the solvent. The film protects the surface from dirt, debris, fingerprints, roll markingj belt marks and so on during fabrica-tion, handling and installation. Thereafter, the soluble protective film is easily washed off to provide a clean, unmarked surface. The soluble protective film of the present invention is particularly useful on glass sheets.
-Description of the Preferred Embodiments A thin protective film of a soluble polymer is preferably appliedto a substrate by contacting the surface of the substrate with a solution of the polymer and evaporating the solvent. Any convenient means of appli-cation such as brushing, dipping, or spraying may be employed. Preferred ~2S899~i solvents include water, as well as volatile, water miscible alcohols and ketor.es, such as methanol, ethanol, propanol, acetone, methyl ethyl ketone, and so on, for fast drying. The solution may also contain a wetting agent to promote uniformity of the film, as well as to optimi~e rinsing and spot-free drying, especially when the solvent is water. Préferred polymers are wate~ soluble. A preferred water soluble polymer is polyvinyLpyrrolidone.
In some applications, a water soluble polymer is preferably also oil-insoluble. In such applications, preferred polymers include alginates and xantham gums as well as polyvinylpyrrolidone. Copolymers of polyvinyl-pyrrolidone and polyvinylacetate may also be employed, as well as polyvinyl- -alcohol polymers and copolymers.
In one preferred embodiment of the present invention, a film of polyvinylpyrrolidone is applied to the exposed glass surfaces of glass/
plastic sheet assemblies to be laminated in an oil autoclave. The film is preferably applied to the exposed glass surfaces by dipping or spraying, using an aqueous solution of about 1 to lO percent polyvinylpyrrolidone.
The polyvinylpyrrolidone film survives oil autoclave temperature and pres-sure condltions without decomposing or baking on to the glass surface, and without any reaction with or contamination of the autoclave oil. Following oil autoclave lamination, the treated glaes surfaces are rinsed with hot water, which removes any oil resldue along with the polyvinylpyrrolidone protective film, eliminating the need for multiple detergent washing and ~ot water rinsing steps.
In other preferred embodiments of the present invention, clean glass sheets are contacted with solutions of polyvinylpyrrolidone in alcohol, w~ich may contain a wetting agent for uniform wetting and fast drying. The solvent i8 evaporated, and a thin protective film of polyvinylpyrrolidone ~Z58~98 is formed on the glass surface. The treated glass sheets are then su~jected to various fabricating processes such as machining, drilling, edge seaming, and so on. The polyvinylpyrrolidone protective film minimizes adherence of dirt and debris, as well as fingerprints, roll mar~ing and belt marks.
After fabrication, handling and installation, the glass is simply washed to remove the polyvinylpyrrolidone film and reveal a clean, unmarked glass sur-face. This surface protection treatment may also be employed with various plastic substrates, as well as polymeric materials such as butyl rubber.
Solutions containing up to about 30 percent polymer are preferred.
The present invention will be further understood from the descrip-tion of specific examples which follow.
EXAMPLE I
Glass sheets are assembled with polymeric interlayers to form a multilayer unit for lamination. These glass/plastic assemblies are dipped for 1 minute in an aqueous solution containing 1 percent colloidal sodium alginate polymer. The polymer is hydrophilic, oil insoluble, nontoxic, relatively inexpensive, and readily available from Kelco Co. under the name Kelgln XL. The glass sheets are removed from the solution ànd air dried.
The treated glass sheets are subjected-to oi-l autoclave conditions of 300F.
(about 149C.) under 200 pounds per square inch pressure for 45 minutes.
For comparlson, untreated- glass sheets are-laminated under the same condi-tions. After removal from the oil autoclave, both treated and untreated laminates are washed to remove oil residue. Treated glass surfaces are oil-free after a single hot water rinse, whereas untreated glass surfaces further require a hot water detergent wash and at least two more hot water rinses.
~2S~3~9~
EXAMPL~ II
Glass/plastic assemblies as described in Example I are dipped in an aqueous solution comprising 2 percent polyvinylpyrrolidone and 0.1 per-cent of a wetting agent, available as ZONYL-FSN from DuPont. The assemblies are removed from the solution, air dried and subjected to oil-autoclave l~mination conditions, along with untreated glass/plastic assemblies, as in the previous example. Upon removal from the autoclave, all glass surfaces ~re washed to remove oil residue. As in the previous example, the treated glass surfaces are oil-free after a single hot water rinse, while the untreated glass surfaces require a hot water detergent wash and at least two more hot water rinses.
EXAMPLE III
Glass/plastic assemblies are sprayed with an aqueous solution of
Background of the Invention The present invention relates generally to the art of protecting glass surfaces, and more particularly to the art of protecting glass sur-faces with removable protective films.
U.S. Patent ~o. 4,263,371 to Franz discloses a method for reduc-ing the surface energy of a glass article by chemisorption of an alkyltin compound. The tin-functional moiety bonds to the glass surface, while the organic moiety is oriented outward from the glass to provide a low energy surface layer which results in low friction, low chemical reactivity, and repellency of water, dirt and glass chips.
U.S. Patent No. 4,276,350 to Franz discloses a method for reducing the reactivity of a glass surface with a fluorocarbon. The method involves adsorbing multivalent metal cations at the glass surface to provide anchor-ing sites for the chemisorption of otherwise nonreactive fluorocarbons.
The resulting fluorocarbon treated glass surface is repellent to both water and organic solvents.
~ Both of the above references teach protecting a glass surface by means of a treatment which reacts with and becomes incorporated onto the glass surface. In some instances, a removable protective layar is desirable.
For exampIe, when glass sheets and plastic interlayers are laminated in an oil autoclave to produce safety windshields, removal of oil residue from the glass surfaces currently requires extensive multiple cleaning steps using detergent washes and hot water rinsés, as well as high-velocity blow-off drying. In accordance with the present invention, a water soluble, but ~Z~8~9~
oil insoluble, protective film is applied to the exposed glass surfaces prior to oil autoclave lamination Thereafter, oil residue, as well as t'ne protective film, may be removed by a single hot water rinse.
A water soluble polymer protective film in accordance with the present invention may be usefully employed in a wide variety of applications.
When applied to a clean &lass surface prior to fabricating processes, a water soluble polymer protective film of the present invention minimizes handling marks, such as fin&erprints and roll or belt marks, as well as adherence of dirt and debris. After fabrication, handling and installation, the protective film is easily washed off leaving a clean, unmarked glass surface.
Summary of the Invention A temporary protective film is applied to a substrate surface by applying a solution of a soluble film-forming polymer to the surface and evaporating the solvent. The film protects the surface from dirt, debris, fingerprints, roll markingj belt marks and so on during fabrica-tion, handling and installation. Thereafter, the soluble protective film is easily washed off to provide a clean, unmarked surface. The soluble protective film of the present invention is particularly useful on glass sheets.
-Description of the Preferred Embodiments A thin protective film of a soluble polymer is preferably appliedto a substrate by contacting the surface of the substrate with a solution of the polymer and evaporating the solvent. Any convenient means of appli-cation such as brushing, dipping, or spraying may be employed. Preferred ~2S899~i solvents include water, as well as volatile, water miscible alcohols and ketor.es, such as methanol, ethanol, propanol, acetone, methyl ethyl ketone, and so on, for fast drying. The solution may also contain a wetting agent to promote uniformity of the film, as well as to optimi~e rinsing and spot-free drying, especially when the solvent is water. Préferred polymers are wate~ soluble. A preferred water soluble polymer is polyvinyLpyrrolidone.
In some applications, a water soluble polymer is preferably also oil-insoluble. In such applications, preferred polymers include alginates and xantham gums as well as polyvinylpyrrolidone. Copolymers of polyvinyl-pyrrolidone and polyvinylacetate may also be employed, as well as polyvinyl- -alcohol polymers and copolymers.
In one preferred embodiment of the present invention, a film of polyvinylpyrrolidone is applied to the exposed glass surfaces of glass/
plastic sheet assemblies to be laminated in an oil autoclave. The film is preferably applied to the exposed glass surfaces by dipping or spraying, using an aqueous solution of about 1 to lO percent polyvinylpyrrolidone.
The polyvinylpyrrolidone film survives oil autoclave temperature and pres-sure condltions without decomposing or baking on to the glass surface, and without any reaction with or contamination of the autoclave oil. Following oil autoclave lamination, the treated glaes surfaces are rinsed with hot water, which removes any oil resldue along with the polyvinylpyrrolidone protective film, eliminating the need for multiple detergent washing and ~ot water rinsing steps.
In other preferred embodiments of the present invention, clean glass sheets are contacted with solutions of polyvinylpyrrolidone in alcohol, w~ich may contain a wetting agent for uniform wetting and fast drying. The solvent i8 evaporated, and a thin protective film of polyvinylpyrrolidone ~Z58~98 is formed on the glass surface. The treated glass sheets are then su~jected to various fabricating processes such as machining, drilling, edge seaming, and so on. The polyvinylpyrrolidone protective film minimizes adherence of dirt and debris, as well as fingerprints, roll mar~ing and belt marks.
After fabrication, handling and installation, the glass is simply washed to remove the polyvinylpyrrolidone film and reveal a clean, unmarked glass sur-face. This surface protection treatment may also be employed with various plastic substrates, as well as polymeric materials such as butyl rubber.
Solutions containing up to about 30 percent polymer are preferred.
The present invention will be further understood from the descrip-tion of specific examples which follow.
EXAMPLE I
Glass sheets are assembled with polymeric interlayers to form a multilayer unit for lamination. These glass/plastic assemblies are dipped for 1 minute in an aqueous solution containing 1 percent colloidal sodium alginate polymer. The polymer is hydrophilic, oil insoluble, nontoxic, relatively inexpensive, and readily available from Kelco Co. under the name Kelgln XL. The glass sheets are removed from the solution ànd air dried.
The treated glass sheets are subjected-to oi-l autoclave conditions of 300F.
(about 149C.) under 200 pounds per square inch pressure for 45 minutes.
For comparlson, untreated- glass sheets are-laminated under the same condi-tions. After removal from the oil autoclave, both treated and untreated laminates are washed to remove oil residue. Treated glass surfaces are oil-free after a single hot water rinse, whereas untreated glass surfaces further require a hot water detergent wash and at least two more hot water rinses.
~2S~3~9~
EXAMPL~ II
Glass/plastic assemblies as described in Example I are dipped in an aqueous solution comprising 2 percent polyvinylpyrrolidone and 0.1 per-cent of a wetting agent, available as ZONYL-FSN from DuPont. The assemblies are removed from the solution, air dried and subjected to oil-autoclave l~mination conditions, along with untreated glass/plastic assemblies, as in the previous example. Upon removal from the autoclave, all glass surfaces ~re washed to remove oil residue. As in the previous example, the treated glass surfaces are oil-free after a single hot water rinse, while the untreated glass surfaces require a hot water detergent wash and at least two more hot water rinses.
EXAMPLE III
Glass/plastic assemblies are sprayed with an aqueous solution of
2 percent polyvinylpyrrolidone and 0.05 percent wetting agent as in ~xample II. The treated assemblies, along with lmtreated controls, are subjected to oil autoclave conditions as in the previous examples. Again, only the treated glass surfaces are oil-free after a single hot water rinse.
~XAMPL~ LV
Glass sheets are sprayed with a solution of 10 percent polyvinyl-pyrrolidone and 0.1 percent wetting agent in isopropanol, which evaporatesquickly. The sheets, along with untreated glass sheets, are subiected to edge working, which generates abrasive particles along with siliceous par-ticulate debris which contaminate the glass surfaces. After this seaming process, both treated and untreated glass sheets are subjected to a single hot water rinse. The treated glass sheets emerge clean, while the untreated sheets remain streaked and spotted, and require hand cleaning with glass cleaner to remove the siliceous debris.
~S8998 EXAMPL _ Pairs of glass sheets are fabricated into multiple glazed window units having butyl rubber sealed edges. The butyl rubber may become tacky and stick to packaging material, or debris may adhere to the seaied edges.
To eliminate the problems associated with the tackiness of the butyl rub- -ber, the sealed edges of the units are contacted, prior to handling and shipping, with a solution comprising 20 to 30 percent polyvinylpyrrolidone in either water or isopropanol. The solution is brushed on and the solvent is evaporated, leaving behind a thin, clear film of polyvinylpyrrolidone which is not tacky. The units are heated to 250F. (about 121C.) for 20 minutes and there is still no tackiness at the surface. These units are shipped, stored and installed without encountering adhesion of contaminants to the butyl rubber sealant. The protective film is removed, when desired, by washing with water.
These examples are offered only to illustrate the present inven-tion, which includes variations and modifications of the preferred embodi-ments. For exampleJ various soluble, film-forming polymers may be applied in other solvents and by alternative techni~ues such as roll coating.
Other optional wetting agents may be employed, and substrates other than glass, such as plastics, may be treated. The scope of the present inven-tion is defined by the following claims.
~XAMPL~ LV
Glass sheets are sprayed with a solution of 10 percent polyvinyl-pyrrolidone and 0.1 percent wetting agent in isopropanol, which evaporatesquickly. The sheets, along with untreated glass sheets, are subiected to edge working, which generates abrasive particles along with siliceous par-ticulate debris which contaminate the glass surfaces. After this seaming process, both treated and untreated glass sheets are subjected to a single hot water rinse. The treated glass sheets emerge clean, while the untreated sheets remain streaked and spotted, and require hand cleaning with glass cleaner to remove the siliceous debris.
~S8998 EXAMPL _ Pairs of glass sheets are fabricated into multiple glazed window units having butyl rubber sealed edges. The butyl rubber may become tacky and stick to packaging material, or debris may adhere to the seaied edges.
To eliminate the problems associated with the tackiness of the butyl rub- -ber, the sealed edges of the units are contacted, prior to handling and shipping, with a solution comprising 20 to 30 percent polyvinylpyrrolidone in either water or isopropanol. The solution is brushed on and the solvent is evaporated, leaving behind a thin, clear film of polyvinylpyrrolidone which is not tacky. The units are heated to 250F. (about 121C.) for 20 minutes and there is still no tackiness at the surface. These units are shipped, stored and installed without encountering adhesion of contaminants to the butyl rubber sealant. The protective film is removed, when desired, by washing with water.
These examples are offered only to illustrate the present inven-tion, which includes variations and modifications of the preferred embodi-ments. For exampleJ various soluble, film-forming polymers may be applied in other solvents and by alternative techni~ues such as roll coating.
Other optional wetting agents may be employed, and substrates other than glass, such as plastics, may be treated. The scope of the present inven-tion is defined by the following claims.
Claims (19)
IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for providing temporary protection for a surface of a substrate comprising the steps of contacting the surface of the substrate with a solution of soluble film-forming polymer selected from the group consisting of alginates, polyvinylalcohols, polyvinylpyrrolidone, and copolymers thereof, and evaporating the solvent to form a thin polymer film on the substrate surface, said thin film being subsequently removed from the substrate surface by complete dissolution of the film in a solvent.
2. The method according to Claim 1, wherein the polymer is water soluble.
3. The method according to Claim 2, wherein the polymer is selected from the group consisting of alginates, polyvinylalcohols, poly-vinylpyrrolidone and copolymers thereof.
4. The method according to Claim 3, wherein the polymer is polyvinylpyrrolidone.
5. The method according to Claim 3, wherein the solution com-prises a solvent selected from the group consisting of water, water-miscible ketones and alcohols, and mixtures thereof.
6. The method according to Claim 5, wherein the solution further comprises a wetting agent.
7. In a method comprising processing a glass substrate wherein the glass substrate is exposed to contamination, the improvement which comprises applying a thin soluble polymer film selected from the group consisting of alginates, polyvinylalcohols, polyvinylpyrrolidone and copolymers thereof to said surface prior to processing, said thin soluble film being subsequently removed from the substrate surface by complete dissolution of the film in a solvent.
8. The method according to Claim 7, wherein said polymer is water soluble.
9. The method according to Claim 8, wherein said polymer is selected from the group consisting of alginates, polyvinylalcohols, poly-vinylpyrrolidone ant copolymers thereof.
10. The method according to Claim 9, wherein the polymer is polyvinylpyrrolidone.
11. The method according to Claim 9, wherein said polymer film is applied by contacting the glass surface with a solution of the polymer and evaporating the solvent.
12. The method according to Claim 11, wherein the solvent is selected from the group consisting of water, water-miscible alcohols and ketones, and mixtures thereof.
13. The method according to Claim 12, wherein the solution fur-ther comprises a wetting agent.
14. An article of manufacture comprising a substrate selected from the group consisting of glass and polymeric materials, and disposed on a surface portion of said substrate, a thin protective film of a soluble polymer selected from the group consisting of alginates, polyvinylalcohols, polyvinylpyrrolidone and copolymers [and mixtures] thereof.
15. An article according to Claim 14, wherein said polymer is water soluble.
16. An article according to Claim 15, wherein said polymer is selected from the group consisting of polyvinylalcohols, poly-vinylpyrrolidone and copolymers thereof.
17. An article according to Claim 16, wherein the polymer is polyvinylpyrrolidone.
18. An article according to Claim 16, wherein the substrate is glass.
19. An article according to Claim 18, wherein the polymer film is polyvinylpyrrolidone.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US48142283A | 1983-04-01 | 1983-04-01 | |
| US481,422 | 1983-04-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1258998A true CA1258998A (en) | 1989-09-05 |
Family
ID=23911882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000450481A Expired CA1258998A (en) | 1983-04-01 | 1984-03-26 | Soluble protective film |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1258998A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116079957A (en) * | 2023-03-23 | 2023-05-09 | 洛阳船舶材料研究所(中国船舶集团有限公司第七二五研究所) | Soluble core mold surface sealing method and composite material product manufacturing method |
-
1984
- 1984-03-26 CA CA000450481A patent/CA1258998A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116079957A (en) * | 2023-03-23 | 2023-05-09 | 洛阳船舶材料研究所(中国船舶集团有限公司第七二五研究所) | Soluble core mold surface sealing method and composite material product manufacturing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |