Page 208 - Handbook of Adhesion Promoters

9.19 Laminates 201

9.19 LAMINATES

The laminate films protect an underlying window surface from scratches or other dam-
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age. Adhesion promoter and primer layers enhance adhesion. The adhesion promoter
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layer is formed from an acrylic-polyurethane resin having a thickness of 0.1-0.5 μm. The
primer layer is formed from an acrylic-fluoropolymer resin and an ultraviolet inhibitor
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having a thickness of 1-5 μm.
A laminate composition includes a UV curable acrylate adhered to an acrylated
silane primer having at least one terminal halogen group with the silane primer being
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adhered to a siliceous surface. Strong chemical bonds are formed between the primer and
the siliceous surface as well as between the primer and the UV curable coating. The meth-
acryloxypropyltrichlorosilane, methacryloxybutyltrichlorosilane, methacryloxyhexyl-
trichlorosilane, and acryloxybutyltrichlorosilane are considered the most suitable for this
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application.
Ethylene vinyl alcohol has been one of the most effective barrier materials known to
the flexible packaging industries, especially in providing an excellent barrier for oxygen
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and aroma. However, the polar EVOH is not compatible with the non-polar polyolefinic
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film such as biaxially oriented polypropylene. Thus, it requires an adhesion promoter or
tie-layer resin such as anhydride-modified polyolefin in order to adhere to a non-polar
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polyolefinic substrate. Additionally, EVOH loses its barrier property if it is exposed to a
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high moisture environment. Therefore, it requires a moisture barrier layer for protection
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such as an anhydride-modified polyolefin or other non-polar layer or metallized layer.
REFERENCES
1 McCormick, CE; Strong, BA; Ridges, MD; Plumb, KA; Smith, J, US8172300, Clearplex Corporation,
Jun. 23, 2012.
2 Upadhyaya, A; Castro, S; Rao, MKK, US20140050917, Nanofilm Ltd., Feb. 20, 2014.
3 Watanabe, H; Lee, MS, US7252878, Toray Plastics (America), Inc., Aug. 7, 2007.