Interlayer composite structure for laminating glass with controlled diffusing properties at high transmission and a process for making same
AssigneeE. I. Du Pont de Nemours and Company
InventorsRichard A. Fugiel, Thomas R. Phillips
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Abstract
The present invention is a translucent interlayer, or a laminate obtained therefrom, that has low clarity, high haze, and light transmission of at least 60 percent wherein the aesthetic qualities of etched or sandblasted glass are substantially recreated. In addition, a laminate of the present invention provides the safety characteristics of laminated safety glass. In addition, the process for making the translucent laminates of the present invention can eliminate the safety and environmental concerns related to sandblasting or etching processes.
Claims26
An interlayer composition comprising particles of colorant having a particle size of less than about 10 microns, wherein an interlayer sheet formed from the interlayer composition:
- (1) has a haze of from about 25 percent to about 90 percent, (2) allows at least about 60 percent of incident light to be transmitted through the interlayer, and (3) has clarity of at least 20%.
A glass laminate comprising at least two pieces of glass and an interlayer composition positioned therebetween to form an interlaver sheet, wherein the interlayer sheet:
- (1) comprises particles of colorant having a particle size of less than about 10 microns, (2) has a haze of from about 25 percent to about 90 percent, (3) allows at least about 60 percent of incident light to be transmitted through the interlayer, and (4) has clarity of at least 20%.
A process for producing an PVB sheet suitable for laminated glass applications, the process comprising the steps of (a) feeding colorant into an extruder at a controlled rate;
- (b) co-extruding polyvinyl butyral resin, colorant, plasticizer, and other optional additives;
- (c) quenching the molten sheet composition to obtain a PVB sheet having dimensional stability suitable for laminated glass applications, wherein the PVB sheet:
- (1) has a haze of from about 25 percent to about 90 percent, (2) allows at least about 60 percent of incident light to be transmitted through the interlayer, and (3) has clarity of at least 20%.
Dependencies are inferred from the claim text.