Low emissivity film
First Claim
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1. A functional film material for providing an insulation regime facilitated by low emissivity comprising:
- a substrate layer selected from cellulose acetate, cellulose and derivatives thereof; and
a coating layer forming the outermost layer of the film, the coating layer comprising;
a block copolymeric binder, anda particulate metal pigment therein,a ratio of pigment to binder in the coating layer being selected with reference to a coat weight and to be within a range from 3;
1 to 1;
10 to provide the functional film material with an emissivity 0.5 or less;
the substrate and coating layer being selected to provide the film with an ambient water vapor transmission rate (WVTR (ambient)) in excess of 400 gm−
2 d−
1 bar−
1, wherein the WVTR of the substrate is at least 10 gm−
2 d−
1 bar−
1 higher than the coating layer andwherein the substrate layer has a higher WVTR than the coating layer, such that the determining factor of the WVTR of the film as a whole is the coating layer.
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Abstract
The present invention concerns a functional film material comprising a substrate layer and a coating layer, the coating layer comprising a block copolymeric binder and a particulate metal pigment therein, the ratio of pigment to binder in the coating layer being selected with reference to the coat weight to provide the functional film material with an emissivity of less than 0.5, and the substrate and coating layer being selected to provide the film with a VWTR (ambient) in excess 400 gm−2 d−1 bar−1.
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Citations
19 Claims
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1. A functional film material for providing an insulation regime facilitated by low emissivity comprising:
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a substrate layer selected from cellulose acetate, cellulose and derivatives thereof; and a coating layer forming the outermost layer of the film, the coating layer comprising; a block copolymeric binder, and a particulate metal pigment therein, a ratio of pigment to binder in the coating layer being selected with reference to a coat weight and to be within a range from 3;
1 to 1;
10 to provide the functional film material with an emissivity 0.5 or less;the substrate and coating layer being selected to provide the film with an ambient water vapor transmission rate (WVTR (ambient)) in excess of 400 gm−
2 d−
1 bar−
1, wherein the WVTR of the substrate is at least 10 gm−
2 d−
1 bar−
1 higher than the coating layer andwherein the substrate layer has a higher WVTR than the coating layer, such that the determining factor of the WVTR of the film as a whole is the coating layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification