Enhanced heat mirror films
Assignee3M Innovative Properties Company
InventorRobert James Fleming
Life of this patent
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Abstract
A heat mirror film containing visible light-transmissive and infrared reflective film comprising a birefringent dielectric multilayer support that reflects at least 50% of light in a band at least 100 nm wide in a wavelength region of interest, a metal or metal alloy layer whose thickness is such that the film is visible light-transmissive and its reflection band is broadened, and a crosslinked polymeric layer has improved infrared reflecting properties. The film can be joined or laminated into glazing (especially non-planar vehicular safety glazing) with reduced likelihood that the metal or metal alloy layer will be damaged or distorted.
Claims46
A process for making a film comprising:
- a) providing a visible light-transmissive birefringent dielectric multilayer support that reflects at least 50% of light in a band at least 100 nm wide in a wavelength region of interest, and
- b) forming in either order atop the support:
- i) a visible light-transmissive metal or metal alloy layer, and
- ii) a crosslinked polymeric layer,
- whereby the thickness of the metal or metal alloy layer is such that the film is at least about 20% visible light-transmissive and its reflection band is broadened with respect to that of the support.
A process for making a glazing article comprising:
- a) assembling a layer of glazing material and a film comprising a birefringent dielectric multilayer support that reflects at least 50% of light in a band at least 100 nm wide in a wavelength region of interest and which has atop the support in either order a crosslinked polymeric layer and a metal or metal alloy layer whose thickness is such that the film is at least about 20% visible light-transmissive and its reflection band is broadened, and
- b) bonding the glazing material and film together into a unitary article.
A process for making a laminate article comprising:
- a) assembling:
- i) a first layer of a glazing material,
- ii) a first mechanical energy-absorbing layer,
- iii) a visible light-transmissive and infrared-reflective film comprising a birefringent dielectric multilayer support that reflects at least 50% of light in a band at least 100 nm wide in a wavelength region of interest and which has atop the support in either order a crosslinked polymeric layer and a metal or metal alloy layer whose thickness is such that the film is at least about 20% visible light-transmissive and its reflection band is broadened,
- iv) a second mechanical energy-absorbing layer and
- v) a second layer of gazing material,
- so that the film is between the first and second mechanical energy-absorbing layers and the first and second mechanical energy-absorbing layers are between the first and second layers of glazing material,
- b) removing residual air from between the layers, and
- c) beating and applying pressure to bond the layers together into a unitary article.
A film comprising a birefringent dielectric multilayer support that reflects at least 50% of light in a band at least 100 nm wide in a wavelength region of interest and which has atop the support in either order a crosslinked polymeric layer and a metal or metal alloy layer whose thickness is such that the film is at least about 20% visible light-transmissive and its reflection band is broadened with respect to that of the support.
A safety glazing pre-laminate comprising at least one layer of a mechanical energy-absorbing material joined to a visible light-transmissive and infrared-reflective film comprising a birefringent dielectric multilayer support that reflects at least 50% of light in a band at least 100 nm wide in a wavelength region of interest and which has atop the support in either order a crosslinked polymeric layer and a metal or metal alloy layer whose thickness is such that the film is at least about 20% visible light-transmissive and its reflection band is broadened with respect to tat of the support.
A glazing article comprising at least one layer of glazing material joined to a visible light-transmissive and infrared-reflective film comprising a birefringent dielectric multilayer support that reflects at least 50% of light in a band at least 100 nm wide in a wavelength region of interest id which has atop the support in either order a crosslinked polymeric layer and a metal or metal alloy layer whose thickness is such that the film is at least about 20% visible light-transmissive and its reflection band is broadened wit respect to that of the support.
A vehicle with glazing comprising at least one windshield, backlight, side window or skylight comprising a visible light-transmissive and infrared reflective film comprising a birefringent dielectric multilayer support that reflects at least 50% of light in a band at least 100 nm wide in a wavelength region of interest and which has atop the support in either order a crosslinked polymeric layer and a metal or metal alloy layer whose thickness is such that the film is at least about 20% visible light-transmissive and its reflection band is broadened with respect to that of the support.
Dependencies are inferred from the claim text.