Process for making safety glass laminates subject to nonsymmetrical thermal stress
First Claim
1. A process for producing a non-symmetrical laminate of glass and plastic comprising the steps of:
- (a) treating a glass blank with a difunctional silane coupling agent;
(b) forming a first laminate by placing the glass blank against a sheet of an aliphatic polyether polyurethane, and heating to about 200°
-220°
F.; and
,(c) forming a second laminate of said initial laminate and a plastic sub-layer by placing sub-layer against the aliphatic polyether polyurethane, and simultaneously heating to about 130°
-160°
F. and pressurizing to about 150 psi for about one hour, whereby non-symmetrical thermal shear stresses between the first and second laminates are minimized.
3 Assignments
0 Petitions
Accused Products
Abstract
A process is disclosed for producing multi-layer laminates of glass and plastic of the type subject to nonsymmetrical thermal shear stress, such as flat or curved glass-plastic laminates or curved glass-plastic-glass sandwiches. Use of difunctional silane-treated glass and an aliphatic polyether polyurethane interlayer allows curing at temperatures low enough to minimize shear stresses which tend to cause delamination or shattering of the thin layer of glass in the finished part. The interlayer of aliphatic polyether polyurethane can be replaced by cured-in-place polyurethane having a polyether backbone, allowing processing at even lower temperatures.
-
Citations
16 Claims
-
1. A process for producing a non-symmetrical laminate of glass and plastic comprising the steps of:
-
(a) treating a glass blank with a difunctional silane coupling agent; (b) forming a first laminate by placing the glass blank against a sheet of an aliphatic polyether polyurethane, and heating to about 200°
-220°
F.; and
,(c) forming a second laminate of said initial laminate and a plastic sub-layer by placing sub-layer against the aliphatic polyether polyurethane, and simultaneously heating to about 130°
-160°
F. and pressurizing to about 150 psi for about one hour, whereby non-symmetrical thermal shear stresses between the first and second laminates are minimized. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A process for producing a non-symmetrical laminate of glass and plastic comprising the steps of:
-
(a) treating a glass blank with a difunctional silane coupling agent; (b) injecting an uncured aliphatic polyurethane having a polyether backbone and a curing accelerator between said glass blank and a plastic sublayer; and
,(c) curing said product by heating to about 100°
F. for about one hour, whereby non-symmetrical thermal shear stresses are minimized. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
Specification