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It has now been found that the addition of a low-moisture absorbing layer and a tie layer on one or both sides of an acrylic substrate results in a low-moisture-absorbing acrylic sheet that resists the warping and bowing resulting from moisture absorption in standard acrylic sheet. The tie layer composition may be used in a co-extrusion process by minimizing viscosity differences between the extruded layers at typical acrylic sheet processing conditions while also providing the suitable adhesion between the layers for long-term uses.
SUMMARY OF THE INVENTION
The invention relates to a low moisture absorbing multi-layer acrylic sheet, film, profile or other shaped object, comprising an acrylic substrate, at least one tie layer and at least one moisture-resistant material between the acrylic substrate and the side of the multi-layer acrylic sheet in contact with the environment.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plot of water absorption vs. time for an acrylic sheet having various protective layers.
DETAILED DESCRIPTION OF THE INVENTION
By “weatherableâ€, as used herein is meant that articles made of the acrylic sheet will have no significant changes in yellowness index (ΔYI) and Haze % (ΔHaze) after exposure under an artificial Xenon Arc weathering device, reference test method ASTM G155, ASTM-D1003 and ASTM E313. The ASTM stands for American Society for Testing and Materials.
By “transparent†as used herein is meant the acrylic sheet has a total white light transmission (TWLT) higher than 50% and haze % lower than 30%, measured by ASTM-D1003.
By “sheetâ€, “sheet or profile†as used herein is meant a multi-layer sheet having a substrate, tie layer(s) and a low moisture adsorbing layer(s). The term “sheet†is generally used to mean any the composition or article in a solid form, which could be a sheet, film, profile, or other shaped multi-layer object.
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