Glass laminate using textured adhesive

Abstract

A method for laminating glass, a laminate assembly, and an adhesive-coated plastic material used in a laminate assembly. Specifically an adhesive, once applied to a plastic layer is grooved or textured to allow formerly trapped air to escape from between layers of a laminate assembly during a laminate process. This can allow for the adhesive layer to be thinner, while still providing for a final product that is relatively air bubble-free and optically pleasing or substantially free of optical defects caused by waviness of the plastic layer between two PVB sheets and / or wrinkles of the plastic sheet.

Description

CROSS REFERENCE TO RELATED APPLICATION(S)[0001]This Application is a divisional of U.S. Non-Provisional application Ser. No. 13 / 761,906, filed on Feb. 7, 2013, currently pending, the entire disclosure of which is incorporated by reference herein.BACKGROUND[0002]1. Field of the Invention[0003]The present invention is in the field of laminated materials, specifically optically clear rigid materials, and more specifically to glass or plastic laminates utilizing a textured adhesive in their formation.[0004]2. Description of the Related Art[0005]Glass can be laminated with various plastic layers to form laminated safety glass which can be used in windshields for automobiles, windows for buildings and elsewhere. Certain types of plastic and glass can be used to form laminated safety glass that functions as bulletproof (or bullet-resistant) glass. The plastic layer in a glass laminate can have dyes or coatings to impart various optical characteristics to the resulting laminated safety glas...

AI Technical Summary

Benefits of technology

The patent text is about a method for laminating glass using an adhesive-coated plastic material. The adhesive is applied to the plastic layer and then grooved or textured to allow air bubbles to escape during the lamination process. This results in a thinner adhesive layer, while still producing a final product that is free of air bubbles and optical defects. The technical effect of this method is to produce a higher quality laminated glass with better optical properties.

Problems solved by technology

However, one problem with the use of textured PVB sheets as the adhesive is that, although variations in the thickness of the sheet during the lamination process (i.e., variations associated with the surface roughness of the sheet) may help resolve or address the air bubble issue, such variations can add optical distortion to the laminated safety glass because the variations in the PVB sheet can translate into variations appearing in the resultant glass laminate structure.

In effect, if the surface roughness of the PVB sheet does not sufficiently “flow” so that air space is removed and the resultant surface, after lamination, is essentially smooth and flat, the surface roughness (and / or differences in thickness) can be visible as optical distortion.

An additional problem associated with a laminate comprising a PET layer between two PVB sheets is the formation of another type of optical distortion referred to as waviness or orange peel.

Another problem associated with a laminate comprising a PET layer between two PVB sheets is the formation of wrinkles, particularly with complex curvature laminates such as windshields.

PVB sheets, however, often cannot be made much thinner as they cannot hold surface texturing and may be difficult to work with when they are thinner.

Such a thin layer allows for improvements in optical issues associated with curvature and for reduced wrinkling, but is less able to absorb residual air trapped between layers of the glass laminate.

In other words, previous efforts have fallen short in simultaneously resolving both the optical distortion issues described above along with the air bubble issue.

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