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AssigneeE. I. Du Pont de Nemours and Company
InventorsCharles Smith, Jerrel Anderson
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This invention relates to thermoplastic interlayers for laminated safety glass with superior vacuum de-airing at elevated temperatures and superior tacking and edge sealing properties. The sheeting has surface pattern on at least one of the surfaces characterized by flat surfaces with substantially uninterrupted channels for airflow in at least two non-parallel directions. The channels allow for rapid de-airing while the area roughness parameter ratio ARp/ARt in the range of 0.52 to 0.62, ARt being less than 32 μm, and area kurtosis less than 2.5, allow for ease of tacking of the interlayer onto glass and edge sealing after de-airing has been completed. Said surface pattern may also be superimposed onto a pattern which is generated by melt fracture or other means on at least one side to enhance de-airing and aid edge sealing.
A glass/adhesive sheet laminate comprising at least one layer of glass and a sheet of unplasticized thermoplastic interlayer, which prior to lamination comprises at least one surface comprising an embossed surface pattern which provides relatively uninterrupted channels for de-airing in at least two non-parallel directions, said channels having depth of less than about 20 μm, and width 30 μm to 300 μm and spaced between 0.1 mm and 1 mm apart.
A thermoplastic interlayer having an embossed surface pattern wherein the pattern provides relatively uninterrupted channels for de-airing in at least two non-parallel directions, said channels having depth of less than about 20 μm, and width 30 μm to 300 μm and spaced between 0.1 mm and 1 mm apart, and said surface pattern has roughness parameters such that the area roughness peak height, ARp, is less than 32 μm, and the ratio of the of ARp to ARt is between 0.52 and 0.62, and the area kurtosis is less than 5.
A polymeric sheet useful as an interlayer in a glazing laminate, wherein the sheet has a roughened surface pattern, the pattern comprised of projections of the polymer in close proximity to depressions in said polymer surface, such that it requires less energy to flatten the surface than it requires to flatten a conventional roughened pattern.
Dependencies are inferred from the claim text.