CA1243568A - Soluble polymer interleaving material - Google Patents
Soluble polymer interleaving materialInfo
- Publication number
- CA1243568A CA1243568A CA000450480A CA450480A CA1243568A CA 1243568 A CA1243568 A CA 1243568A CA 000450480 A CA000450480 A CA 000450480A CA 450480 A CA450480 A CA 450480A CA 1243568 A CA1243568 A CA 1243568A
- Authority
- CA
- Canada
- Prior art keywords
- polymer
- glass
- group
- film
- inert
- 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
Abstract
Abstract of the Disclosure A method is disclosed providing temporary protection of a glass surface from staining and scratches by coating the exposed surface with a soluble polymer film incorporating spacer particles of an inert material.
Description
~2~L3~
SOLUBLE POLYMER INTERLEAVING MATERIAL
B ground of the Invention The present invention relates generally to the art of protecting glass surfaces from staining and scratches, and more particularly to the art of protecting glass surfaces without permanently altering the glass surfaces.
U.S. Patent No. 3,723,312 to Hay discloses the use of dedusted agglomerated salicylic acid in conjunction with an inert particulate sepa-rator material, such as wood flour or polystyrene, to prevent staining of stacked glass sheets. U.S. Patent No. 3,798,112 to Hay discloses agglom-erating salicylic acid with polyethylene oxide to produce an interleaving material which further comprises an inert particulate separating material such as wood flour or polystyrene to prevent staining of stacked glass sheets.
U.S. Patent No. 4,011,359 to Simpkin et al discloses an inter-leaving material for separatlng glass sheets and protecting them from staining and scratches which comprises a porous, finely divided support material, impregnated with a weakly acidic material, and fine particles of a chemically inert plastic material.
U.S. Patent No. 4,200,670 to Albach describes a method for pro-tecting glass sheets during packing, shipping and storing. The methodinvolves applying water, a stain inhibiting material, and dry, finely divided particles of a mechanical separator to the surfaces of glass sheets prior to stacking them, in a plurality of sequential steps that produce`an adherent coating which acts as a protective interleaving between facing glass surfaces when the sheets are stacked.
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U.S. Patent No. 4,263,371 to Franz discloses a method for reduc-ing the surface energy of glass by chemisorption of an alkyltin compound at the glass surface. U.S. Patent No. 4,360,544 to Franz discloses a method for protecting the surfaces of stacked glass sheets by chelDisorption of an organotin compound on the glass surfaces, and separation of adjacent glass surfaces with an inert interleaving material.
Su ry of the Inventio The present invention provides effective temporary protection to a surface, as well as an interleaving material for protection and sepa-ration of adjacent surfaces. The present invention involves forming a soluble polymer film on the substrate surface. The soluble polymer film may further comprise inert, insoluble spacer particles such as polyethylene or acrylic beads, as well as stain inhibitors such as adipic acid, or hydrophobic additives such as chemically reacted colloidal silica. The protective film of the present invention is applied to a substrate surface prior to handling, storage, shipping, installation, and so on to protect the surface from staining,- scratches, dirt, fingerprints, and other con-taminants. When the substrate has reached its final destination, the soluble protective film is easily renoved by ordinary washing procedures.
description of the Preferred Embodiments _ _ _ _ , Substrates preferably glass sheets, are provided with temporary protection Erom staining and scratches by application of a protective film of a soluble polymer. Preferably, glass sheets are contacted with a solu-tion of a water soluble film-forming polymer, and the solvent evaporated to form a water soluble film on a glass surface before the glass is subjected ~3~;6~
to fabrication, finishing, handling, stacking, storage, transportation or installation. A preferred polymer is polyvinylpyrrolidone, and preferred solvents Include water and water miscible alcohols and ketones such as methanol, ethanol, propanol, acetone and methyl ethyl ketone. Suitable application techniques include spraying, dipping and roll coating. The ~olym~r film preferably comprises Inicrosized inert, insoluble organic polymer particles to act as spacer material when glass surfaces are brought together as in stacking for storage or shipment. Preferred polymer spacer materials include polyethylene or acrylic beads.
In one preferred embodiment of the present invention, glass sheets are contacted with a solution of a water soluble film-forming polymer containing inert, insoluble polyethylene particles and hydrophobic colloidal silica. The particles act as spacers when the glass sheets are stacked for storage and shipment. When the glass sheets are installed ;n architectural applications, the hydrophobic colloidal silica minimizes wetting of the glass surfaces and thereby protects the glass surfaces from staining ordinarily caused by concrete or mortar run-off and other contami-nants generally encountered at construction sites.
In a second preferred embodiment of the present invention, where glass sheets are to be silk-screened, a protective film is applied in accord-ance with tlle present invention prior to such processing. In this embodi-Kent, the protective film is applied to one surface of the glass sheets, and must not transfer to the opposite surface. In addition, it is preferred that the polymer film-former, as well as the particulate spacer, burn off without residue during a tempering cycle. A preferred protective film in this embodiment of the present invention comprises polyvinylpyrrolidone film and polyethylene particles.
~356~
In another preferred embodiment of the present invention where a protective film of water soluble polymer acts essentially as an inter-leaving material, the polymer film preferably comprises, in addition to particulate spacing material, a stain inhibiting material such as an organic aeid. A particularly preferred protective film incorporates polyvinyl-pyrrolidone as the film-former, polyethylene as the particulate spacer, and adipic acid as the stain inhibitor.
The present invention will be further understood from the descrip-tions of specific examples which follow.
EXAMPLE I
A solution is prepared comprising 2 percent polyvinylpyrrolidone and 2 pereent interleaving material in propanol. The interleaving material is an equal weight mixture of acrylic beads and adipic acid. This composi-tion is sprayed onto metal oxide coated surfaces of glass sheets. After 11 weeks of exposure at 140F. and 90 pereent relative humidity, the treated glass surfaces show no scum or stain. By comparison, adjacent gIass sur-faces separated by newsprint exhibit light scum, and adjacent surEaces separated by other conventional interleaving materials show even greater surface deterioration.
EXAMPLE II
A solution is prepared comprising 2 percent polyvinylpyrrolidone,
SOLUBLE POLYMER INTERLEAVING MATERIAL
B ground of the Invention The present invention relates generally to the art of protecting glass surfaces from staining and scratches, and more particularly to the art of protecting glass surfaces without permanently altering the glass surfaces.
U.S. Patent No. 3,723,312 to Hay discloses the use of dedusted agglomerated salicylic acid in conjunction with an inert particulate sepa-rator material, such as wood flour or polystyrene, to prevent staining of stacked glass sheets. U.S. Patent No. 3,798,112 to Hay discloses agglom-erating salicylic acid with polyethylene oxide to produce an interleaving material which further comprises an inert particulate separating material such as wood flour or polystyrene to prevent staining of stacked glass sheets.
U.S. Patent No. 4,011,359 to Simpkin et al discloses an inter-leaving material for separatlng glass sheets and protecting them from staining and scratches which comprises a porous, finely divided support material, impregnated with a weakly acidic material, and fine particles of a chemically inert plastic material.
U.S. Patent No. 4,200,670 to Albach describes a method for pro-tecting glass sheets during packing, shipping and storing. The methodinvolves applying water, a stain inhibiting material, and dry, finely divided particles of a mechanical separator to the surfaces of glass sheets prior to stacking them, in a plurality of sequential steps that produce`an adherent coating which acts as a protective interleaving between facing glass surfaces when the sheets are stacked.
~s~
5i6~
U.S. Patent No. 4,263,371 to Franz discloses a method for reduc-ing the surface energy of glass by chemisorption of an alkyltin compound at the glass surface. U.S. Patent No. 4,360,544 to Franz discloses a method for protecting the surfaces of stacked glass sheets by chelDisorption of an organotin compound on the glass surfaces, and separation of adjacent glass surfaces with an inert interleaving material.
Su ry of the Inventio The present invention provides effective temporary protection to a surface, as well as an interleaving material for protection and sepa-ration of adjacent surfaces. The present invention involves forming a soluble polymer film on the substrate surface. The soluble polymer film may further comprise inert, insoluble spacer particles such as polyethylene or acrylic beads, as well as stain inhibitors such as adipic acid, or hydrophobic additives such as chemically reacted colloidal silica. The protective film of the present invention is applied to a substrate surface prior to handling, storage, shipping, installation, and so on to protect the surface from staining,- scratches, dirt, fingerprints, and other con-taminants. When the substrate has reached its final destination, the soluble protective film is easily renoved by ordinary washing procedures.
description of the Preferred Embodiments _ _ _ _ , Substrates preferably glass sheets, are provided with temporary protection Erom staining and scratches by application of a protective film of a soluble polymer. Preferably, glass sheets are contacted with a solu-tion of a water soluble film-forming polymer, and the solvent evaporated to form a water soluble film on a glass surface before the glass is subjected ~3~;6~
to fabrication, finishing, handling, stacking, storage, transportation or installation. A preferred polymer is polyvinylpyrrolidone, and preferred solvents Include water and water miscible alcohols and ketones such as methanol, ethanol, propanol, acetone and methyl ethyl ketone. Suitable application techniques include spraying, dipping and roll coating. The ~olym~r film preferably comprises Inicrosized inert, insoluble organic polymer particles to act as spacer material when glass surfaces are brought together as in stacking for storage or shipment. Preferred polymer spacer materials include polyethylene or acrylic beads.
In one preferred embodiment of the present invention, glass sheets are contacted with a solution of a water soluble film-forming polymer containing inert, insoluble polyethylene particles and hydrophobic colloidal silica. The particles act as spacers when the glass sheets are stacked for storage and shipment. When the glass sheets are installed ;n architectural applications, the hydrophobic colloidal silica minimizes wetting of the glass surfaces and thereby protects the glass surfaces from staining ordinarily caused by concrete or mortar run-off and other contami-nants generally encountered at construction sites.
In a second preferred embodiment of the present invention, where glass sheets are to be silk-screened, a protective film is applied in accord-ance with tlle present invention prior to such processing. In this embodi-Kent, the protective film is applied to one surface of the glass sheets, and must not transfer to the opposite surface. In addition, it is preferred that the polymer film-former, as well as the particulate spacer, burn off without residue during a tempering cycle. A preferred protective film in this embodiment of the present invention comprises polyvinylpyrrolidone film and polyethylene particles.
~356~
In another preferred embodiment of the present invention where a protective film of water soluble polymer acts essentially as an inter-leaving material, the polymer film preferably comprises, in addition to particulate spacing material, a stain inhibiting material such as an organic aeid. A particularly preferred protective film incorporates polyvinyl-pyrrolidone as the film-former, polyethylene as the particulate spacer, and adipic acid as the stain inhibitor.
The present invention will be further understood from the descrip-tions of specific examples which follow.
EXAMPLE I
A solution is prepared comprising 2 percent polyvinylpyrrolidone and 2 pereent interleaving material in propanol. The interleaving material is an equal weight mixture of acrylic beads and adipic acid. This composi-tion is sprayed onto metal oxide coated surfaces of glass sheets. After 11 weeks of exposure at 140F. and 90 pereent relative humidity, the treated glass surfaces show no scum or stain. By comparison, adjacent gIass sur-faces separated by newsprint exhibit light scum, and adjacent surEaces separated by other conventional interleaving materials show even greater surface deterioration.
EXAMPLE II
A solution is prepared comprising 2 percent polyvinylpyrrolidone,
2 percent polyethylene particles, 2 percent hydrophobic colloidal silica, and 0.2 percent wetting agent (ZONYL-FSN from DuPont) in isopropanol. The composition is sprayed onto metal oxide coated surfaces of glass sheets to protect them from concrete and mortar run-off at construction sites. To test T~d~ irk - - ~2~3~;6t3 the protection afforded by the soluble film, the treated sheets are placed in a horizontal position and contacte(l with a cement slurry which is allowed to dry on the coated glass surface. The sheets are then placed in a humidity chamber at 120F. (48.9G.) and 100 percent relative humidity for 2 weeks. when the samples are removed from the chamber and washed, the cement washes off and the coated glass surface is clean with no stain.
EXAMPLE III
To protect glass surfaces from staining and scratches prior to silk screening and tempering, a protective film on one surface of the glass is required which will not transfer to an adjacent glass surface, does not interfere with the silk-screening process, and burns off residue-free during the tempering cycle. A suitable protective film is deposited on glass surfaces from a solution of 2 percent polyvinylpyrrolidone, 2 percent polyethylene particles and 0.2 percent wett;ng agent (ZONYL-FSN from DuPont).
This composition is sprayed onto one surface of a number of glass sheets.
The protective film formed prevents staining and scratching of the glass, does not transfer to adjacent glass sheet surfaces, can be handled with vacuum equipment, does not interfere with silk screening and burns off residue-free in the tempering cycle.
The above examples are offered to illustrate the present invention, which encompasses various modifications. For example other soluble poly-mers may be employed, such as polyvinylalcohols or copolymers of polyvinyl-pyrrolidone. Other solvents may be used, preferably water or water-miscible ketones and alcohols such as acetone, methyl ethyl ketone, rnethanol or ethanol. Other inert spacing material may be utilized such as acrylic beads or wood flour. Other optional wetting agents may be e~nployed, as 5~i~
well as other hydrophobic additives. Substrates other than glass may be protected with films in accordance with the present invention, the scope of which is defined by the following claims.
EXAMPLE III
To protect glass surfaces from staining and scratches prior to silk screening and tempering, a protective film on one surface of the glass is required which will not transfer to an adjacent glass surface, does not interfere with the silk-screening process, and burns off residue-free during the tempering cycle. A suitable protective film is deposited on glass surfaces from a solution of 2 percent polyvinylpyrrolidone, 2 percent polyethylene particles and 0.2 percent wett;ng agent (ZONYL-FSN from DuPont).
This composition is sprayed onto one surface of a number of glass sheets.
The protective film formed prevents staining and scratching of the glass, does not transfer to adjacent glass sheet surfaces, can be handled with vacuum equipment, does not interfere with silk screening and burns off residue-free in the tempering cycle.
The above examples are offered to illustrate the present invention, which encompasses various modifications. For example other soluble poly-mers may be employed, such as polyvinylalcohols or copolymers of polyvinyl-pyrrolidone. Other solvents may be used, preferably water or water-miscible ketones and alcohols such as acetone, methyl ethyl ketone, rnethanol or ethanol. Other inert spacing material may be utilized such as acrylic beads or wood flour. Other optional wetting agents may be e~nployed, as 5~i~
well as other hydrophobic additives. Substrates other than glass may be protected with films in accordance with the present invention, the scope of which is defined by the following claims.
Claims (20)
IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for providing temporary protection to a substrate surface comprising coating such surface with a film comprising a soluble film-forming polymer and inert, insoluble spacer particles.
2. The method according to Claim 1 wherein the substrate is glass.
3. The method according to Claim 2, wherein the polymer is water soluble.
4. The method according to Claim 3, wherein the polymer is selected from the group consisting of polyvinylpyrrolidone, polyvinylalco-hol and copolymers thereof.
5. The method according to Claim 4, wherein the coating is accom-plished by contacting the substrate surface with a solution of said water soluble polymer comprising said inert, insoluble spacer particles and evapo-rating the solvent.
6. The method according to Claim 5, wherein the solvent is selected from the group consisting of water and water-miscible alcohols and ketones.
7. The method according to Claim 6, wherein the polymer is polyvinylpyrrolidone.
8. The method according to Claim 7, wherein the solvent is isopropanol.
9. The method according to Claim 8, wherein the solution further comprises a wetting agent.
10. The method according to Claim 9, wherein the inert spacer par-ticles comprise a material selected from the group consisting of polyethylene and acrylic beads.
11. The method according to Claim 10, wherein the film further comprises a hydrophobic additive.
12. The method according to Claim 11, wherein the hydrophobic additive is hydrophobic colloidal silica.
13. 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 protective coating comprising a soluble polymer film and insoluble inert spacer particles.
14. An article according to Claim 13, wherein the substrate is glass.
15. An article according to Claim 14, wherein the polymer film is water soluble.
16. An article according to Claim 15, wherein said polymer is selected from the group consisting of polyvinylpyrrolidone, polyvinylalco-hols and copolymers thereof.
17. An article according to Claim 16, wherein the polymer is polyvinylpyrrolidone.
18. An article according to Claim 16, wherein the inert spacer particles are selected from the group consisting of polyethylene and acrylic beads.
19. An article according to Claim 18, wherein the coating further comprises an organic acid stain inhibiting agent.
20. An article according to Claim 18, wherein the coating further comprises a hydrophobic compound.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US48141983A | 1983-04-01 | 1983-04-01 | |
| US481,419 | 1983-04-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1243568A true CA1243568A (en) | 1988-10-25 |
Family
ID=23911864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000450480A Expired CA1243568A (en) | 1983-04-01 | 1984-03-26 | Soluble polymer interleaving material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1243568A (en) |
-
1984
- 1984-03-26 CA CA000450480A patent/CA1243568A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |