CA2414380A1 - Window film with thermochromic layer - Google Patents
Window film with thermochromic layer Download PDFInfo
- Publication number
- CA2414380A1 CA2414380A1 CA002414380A CA2414380A CA2414380A1 CA 2414380 A1 CA2414380 A1 CA 2414380A1 CA 002414380 A CA002414380 A CA 002414380A CA 2414380 A CA2414380 A CA 2414380A CA 2414380 A1 CA2414380 A1 CA 2414380A1
- Authority
- CA
- Canada
- Prior art keywords
- layer
- window
- film
- window film
- adhesive layer
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
Abstract
A window film for application to windows has an adhesive layer with an ultraviolet inhibitor and a transparent layer which supports a thermochromic layer that changes colours with ambient temperature. A protective outer layer is applied to the thermochromic layer to be scratch resistant.
The window film is applied to the interior of vehicle windows and changes in appearance according to the heat inside the vehicle.
The window film is applied to the interior of vehicle windows and changes in appearance according to the heat inside the vehicle.
Description
WINDOW FILM WTTH THERMOCHROMIC LAYER
FIELD OF THE INVENTION
This invention relates to window film for application to windows, in particular automobile windows.
BACKGROUND OF THE INVENTION
Decorative window film for automobiles is known and used to enhance the appearance of the vehicle, offer privacy, and shelter from strong sun rays. Such decorative window film is commonly made of a polyester material which may be dyed to provide the desired tint.
Alternatively, the tinting may be provided in an adhesive layer for coupling the window film to the glass surface and the associated polyester material will be clear. Ultraviolet inhibitors may also be included in the adhesive material for absorbing ultraviolet light and thereby protecting the occupants of the vehicle from excessive heat from sun rays.
In order to add interest to such tinted window coverings, it is known to incorporate a photochromic material in the film which is sensitive to ultraviolet light and therefore becomes darker when needed and which tends to be clearer when the vehicle is not exposed to as much ultraviolet light such as on a cloudy day or in the nighttime. One disadvantage of such photochromic materials is that their sensitivity to ultraviolet light also limits their utility because the material becomes damaged with prolonged ultraviolet exposure.
An object of this invention is to provide an alternative window film structure which has a changing appearance but which does not suffer from the above described disadvantages.
SUMMARY OF THE INVENTION
In accordance with the invention, there is provided a window film consisting of a multi-layer synthetic plastic material. The window film has an inner adhesive layer which is adapted to couple the film to a window surface. Most preferably the adhesive layer will have an ultraviolet inhibitor incorporated therein. Optionally, the adhesive layer will have a release sheet coupled to it so that the adhesive will be protected during transportation of the window film and storage before application to a window. The next layer will be a transparent layer such as polyester followed by ' . a second adhesive layer which preferably also has an ultraviolet inhibitor. A second transparent layer, also preferably polyester, is coupled to the second adhesive layer and a thermochromic layer is formed adjacent the second transparent layer, the thermochromic layer being adapted to change colour with ambient temperatures. Finally, the window film has a protective outer layer which is scratch resistant to protect the film.
Optionally, a single layer of adhesive and transparent polyester are provided.
BRIEF DESCRIPTION OF THE DRAWINGS
In order that the invention can be more clearly understood, two embodiments are described with reference to Figs. 1 and 2 of the accompanying drawings in which:
Fig. 1 is a schematic cross-sectional view of a mufti-layer synthetic plastic film made in accordance with the invention and applied to a window; and Fig. 2 is a second embodiment of a mufti-layer synthetic plastic film applied to a window.
DESCRIPTION OF PREFERRED EMBODIMENTS WITH REFERENCE TO DRAWINGS
A first embodiment of a window film made in accordance with the invention is generally indicated by reference numeral 20 in Fig. 1. The window film 20 is applied to the interior surface of a window pane 22. The inner layer of the window film 20 is designated by reference numeral 24 and consists of an inner adhesive layer for coupling the film to the surface of the window pane 22. 'The adhesive will preferably have an ultraviolet inhibitor incorporated therein and could optionally have a dye for tinting the window film 20. The next layer 2fi is a transparent polyester material and this is followed by a section adhesive layer 28 and a second transparent polyester layer 30. The second adhesive layer 28 like the adhesive layer 24 will preferably have an ultraviolet inhibitor and could optionally have a dye incorporated therein. Associated with the second transparent layer 30, there is provided a thermochromic material 32. The thermochromic material is adapted to change colour in accordance with ambient temperature and therefore will change its appearance in accordance with the temperature inside the vehicle and this will in part be determined by the exposure of the window film to ultraviolet light and infrared radiation.
If desired, the thermochromic layer 32 may be masked in certain areas so that the appearance of the film may vary. It will be evident that an image could be formed which would appear when the vehicle is warm and disappear when the vehicle is cold. Finally, an outer protective layer 34 is provided which is preferably scratch resistant in order to shield the thermochromic material from damage.
It will be understood that the basic structure described with reference to Fig. 1 can vary as will be appreciated by those skilled in the art. A second embodiment of the window film made in accordance with the invention is generally indicated in Fig. 2 by reference numeral 40. The remaining components of the window film which are identical to the components of Fig. 1 are identified by like numerals. It will be seen that in the window film 40, there is a single inner adhesive layer 24 and a single transparent layer 26 which is coupled to the thermochromic material 32. It will be appreciated in both embodiments that exposure to ultraviolet radiation indicated generally by arrows 42 is minimized by incorporating an ultraviolet inhibitor into the adhesive layers 24, 28. In this way, the transparent polyester layers 26, 30 and the thermochromic material indicated by layer 32 are protected from degradation resulting from exposure to ultraviolet radiation.
It will be appreciated that many more variations to the structure may be made within the scope of the appended claims. For example, as is common in the art, the inner adhesive layer may be protected during transportation and storage with a release sheet (not shown) which is separated from the film before application to a window pane 22.
FIELD OF THE INVENTION
This invention relates to window film for application to windows, in particular automobile windows.
BACKGROUND OF THE INVENTION
Decorative window film for automobiles is known and used to enhance the appearance of the vehicle, offer privacy, and shelter from strong sun rays. Such decorative window film is commonly made of a polyester material which may be dyed to provide the desired tint.
Alternatively, the tinting may be provided in an adhesive layer for coupling the window film to the glass surface and the associated polyester material will be clear. Ultraviolet inhibitors may also be included in the adhesive material for absorbing ultraviolet light and thereby protecting the occupants of the vehicle from excessive heat from sun rays.
In order to add interest to such tinted window coverings, it is known to incorporate a photochromic material in the film which is sensitive to ultraviolet light and therefore becomes darker when needed and which tends to be clearer when the vehicle is not exposed to as much ultraviolet light such as on a cloudy day or in the nighttime. One disadvantage of such photochromic materials is that their sensitivity to ultraviolet light also limits their utility because the material becomes damaged with prolonged ultraviolet exposure.
An object of this invention is to provide an alternative window film structure which has a changing appearance but which does not suffer from the above described disadvantages.
SUMMARY OF THE INVENTION
In accordance with the invention, there is provided a window film consisting of a multi-layer synthetic plastic material. The window film has an inner adhesive layer which is adapted to couple the film to a window surface. Most preferably the adhesive layer will have an ultraviolet inhibitor incorporated therein. Optionally, the adhesive layer will have a release sheet coupled to it so that the adhesive will be protected during transportation of the window film and storage before application to a window. The next layer will be a transparent layer such as polyester followed by ' . a second adhesive layer which preferably also has an ultraviolet inhibitor. A second transparent layer, also preferably polyester, is coupled to the second adhesive layer and a thermochromic layer is formed adjacent the second transparent layer, the thermochromic layer being adapted to change colour with ambient temperatures. Finally, the window film has a protective outer layer which is scratch resistant to protect the film.
Optionally, a single layer of adhesive and transparent polyester are provided.
BRIEF DESCRIPTION OF THE DRAWINGS
In order that the invention can be more clearly understood, two embodiments are described with reference to Figs. 1 and 2 of the accompanying drawings in which:
Fig. 1 is a schematic cross-sectional view of a mufti-layer synthetic plastic film made in accordance with the invention and applied to a window; and Fig. 2 is a second embodiment of a mufti-layer synthetic plastic film applied to a window.
DESCRIPTION OF PREFERRED EMBODIMENTS WITH REFERENCE TO DRAWINGS
A first embodiment of a window film made in accordance with the invention is generally indicated by reference numeral 20 in Fig. 1. The window film 20 is applied to the interior surface of a window pane 22. The inner layer of the window film 20 is designated by reference numeral 24 and consists of an inner adhesive layer for coupling the film to the surface of the window pane 22. 'The adhesive will preferably have an ultraviolet inhibitor incorporated therein and could optionally have a dye for tinting the window film 20. The next layer 2fi is a transparent polyester material and this is followed by a section adhesive layer 28 and a second transparent polyester layer 30. The second adhesive layer 28 like the adhesive layer 24 will preferably have an ultraviolet inhibitor and could optionally have a dye incorporated therein. Associated with the second transparent layer 30, there is provided a thermochromic material 32. The thermochromic material is adapted to change colour in accordance with ambient temperature and therefore will change its appearance in accordance with the temperature inside the vehicle and this will in part be determined by the exposure of the window film to ultraviolet light and infrared radiation.
If desired, the thermochromic layer 32 may be masked in certain areas so that the appearance of the film may vary. It will be evident that an image could be formed which would appear when the vehicle is warm and disappear when the vehicle is cold. Finally, an outer protective layer 34 is provided which is preferably scratch resistant in order to shield the thermochromic material from damage.
It will be understood that the basic structure described with reference to Fig. 1 can vary as will be appreciated by those skilled in the art. A second embodiment of the window film made in accordance with the invention is generally indicated in Fig. 2 by reference numeral 40. The remaining components of the window film which are identical to the components of Fig. 1 are identified by like numerals. It will be seen that in the window film 40, there is a single inner adhesive layer 24 and a single transparent layer 26 which is coupled to the thermochromic material 32. It will be appreciated in both embodiments that exposure to ultraviolet radiation indicated generally by arrows 42 is minimized by incorporating an ultraviolet inhibitor into the adhesive layers 24, 28. In this way, the transparent polyester layers 26, 30 and the thermochromic material indicated by layer 32 are protected from degradation resulting from exposure to ultraviolet radiation.
It will be appreciated that many more variations to the structure may be made within the scope of the appended claims. For example, as is common in the art, the inner adhesive layer may be protected during transportation and storage with a release sheet (not shown) which is separated from the film before application to a window pane 22.
Claims (6)
1. Window film consisting of a mufti-layer synthetic plastic film for application to windows, the plastic film having an inner adhesive layer for coupling the film to a window surface;
a first transparent layer;
a second adhesive layer;
a second transparent layer;
a thermochromic layer adapted to change colour in accordance with ambient temperature;
and a protective outer layer.
a first transparent layer;
a second adhesive layer;
a second transparent layer;
a thermochromic layer adapted to change colour in accordance with ambient temperature;
and a protective outer layer.
2. Window film consisting of a mufti-layer synthetic plastic film for application to windows, the plastic film having an inner adhesive layer for coupling the film to a window surface;
a transparent layer;
a thermochromic layer adapted to change colour in accordance with ambient temperature;
and a protective outer layer.
a transparent layer;
a thermochromic layer adapted to change colour in accordance with ambient temperature;
and a protective outer layer.
3. Window film according to either Claim 1 or Claim 2 having a release sheet coupled to the inner adhesive layer which is adapted to be removed from said inner adhesive layer before coupling the window film to a window.
4. Window film according to Claim 1 in which the adhesive layers have an ultraviolet inhibitor incorporated therein.
5. Window film according to Claim 2 in which the adhesive layer has an ultraviolet inhibitor incorporated therein.
6. Window film according to either Claim 1 or Claim 2 in which the thermochromic layer has selected areas which are masked to vary the appearance of the film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002414380A CA2414380A1 (en) | 2002-12-09 | 2002-12-09 | Window film with thermochromic layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002414380A CA2414380A1 (en) | 2002-12-09 | 2002-12-09 | Window film with thermochromic layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2414380A1 true CA2414380A1 (en) | 2004-06-09 |
Family
ID=32477047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002414380A Abandoned CA2414380A1 (en) | 2002-12-09 | 2002-12-09 | Window film with thermochromic layer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2414380A1 (en) |
-
2002
- 2002-12-09 CA CA002414380A patent/CA2414380A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |