Safety glazing containing support for attachment of labels
First Claim
1. In a safety windshield comprising a safety glass laminate of a plurality of solid glass sheets and an adherent transparent inner layer of polyvinylbutyral and having bonded to at least one outer glass sheet of said laminate, an adherent solid transparent layer of polyurethane, the improvement which comprises adhesively attaching to said self-healing polyurethane layer, a hard scratch-resistant plastic layer having surface dimensions of about 0.1 to about 1% of the total surface area of the self-healing layer and curing the adhesive at a temperature above about 100°
- C. and a pressure above about 3 bars greater than atmospheric pressure.
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Accused Products
Abstract
The invention relates to safety glass comprising a silicate glass layer and a coating of an elastic material forming a protective layer on at least one side of said glass layer. The coated side has a delineated area formed of a relatively hard, scratch-resistant material to which a label may be removably attached. Thus, when the label is removed, the protective layer is not damaged.
35 Citations
15 Claims
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1. In a safety windshield comprising a safety glass laminate of a plurality of solid glass sheets and an adherent transparent inner layer of polyvinylbutyral and having bonded to at least one outer glass sheet of said laminate, an adherent solid transparent layer of polyurethane, the improvement which comprises adhesively attaching to said self-healing polyurethane layer, a hard scratch-resistant plastic layer having surface dimensions of about 0.1 to about 1% of the total surface area of the self-healing layer and curing the adhesive at a temperature above about 100°
- C. and a pressure above about 3 bars greater than atmospheric pressure.
- View Dependent Claims (2, 3)
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4. In a safety windshield comprising at least one glass sheet having bonded thereto a scratch-resistant layer of self-healing polyurethane formed by curing a sheet of a liquid composition containing (1) a polyglycol ether resulting from the condensation of propylene oxide with trimethylolpropane and having about 10.5 to 12% free hydroxyls and (2) a biuret of 1,6-hexamethylene diisocyanate having about 21 to 22% isocyanate groups, the weight ratio of said biuret to said polyglycol ether being about 0.9 to 1.1;
- the improvement which comprises a label support of hard scratch-resistant plastic material, of generally rectangular dimensions such that the surface area of the label support is about 0.1 to about 1% of the total area of one side of the windshield, adhesively affixed to the polyurethane layer with a layer of thermohardening adhesive.
- View Dependent Claims (5, 6)
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7. A safety windshield comprising at least one glass sheet having bonded thereto a soft plastic outer layer of self-healing polyurethane formed by curing a sheet of a liquid composition containing (1) a polyglycol ether resulting from the condensation of propylene oxide with trimethylolpropane and having about 10.5 to 12% free hydroxyls and (2) a biuret of 1,6-hexamethylene diisocyanate having about 21 to 22% isocyanate groups, the weight ratio of said biuret to said polyglycol ether being about 0.9 to 1.1;
- and a label support of hard scratch-resistant plastic material bonded to the outer side of the soft plastic layer of self-healing polyurethane with a layer of adhesive material capable of withstanding peeling forces greater than the force necessary to rupture the underlying soft polyurethane such that the soft plastic is not disturbed when a label attached to the label support is removed, and said label support covering an area of about 0.1 to about 1% of the total surface area of the outer side of the self-healing polyurethane layer.
- View Dependent Claims (8)
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9. A laminated window comprising a substrate of at least one glass or plastic sheet having bonded thereto a soft plastic outer layer of self-healing polyurethane having a modulus of elasticity below 2,000 daN/cm2 and an elongation to rupture in excess of 60% with less than 2% plastic deformation and formed by curing a sheet of a liquid composition containing (1) a polyglycol ether resulting from the condensation of propylene oxide with trimethylolpropane and having about 10.5 to 12% free hydroxyls and (2) a biuret of 1,6-hexamethylene diisocyanate having about 21 to 22% isocyanate groups, the weight ratio of said biuret to said polyglycol ether being about 0.9 to 1.1;
- and a label support of hard scratch-resistant material bonded to the outer side of the soft plastic outer layer of self-healing polyurethane with a layer of adhesive material which is cured with heat and pressure, said label support covering an area of about 0.1 to 1% of the total surface area of the self-healing polyurethane layer.
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10. A laminated window comprising a substrate of at least one glass or plastic sheet having bonded thereto a soft plastic outer layer of self-healing polyurethane having a modulus of elasticity below 2,000 daN/cm2 and an elongation to rupture in excess of 60% with less than 2% plastic deformation;
- and having a label support of hard scratch-resistant material bonded to the outer side of the soft plastic outer layer of self-healing polyurethane with a layer of thermohardening adhesive material which is cured with heat and pressure, said label support covering an area of about 0.1 to 1% of the total outer surface area of the self-healing polyurethane layer.
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11. A method for making laminated safety glass windshields having at least one outer surface thereof coated with a self-healing anti-lacerative sheet of polyurethane with at least one delineated area suitable for removably affixing labels thereto without damaging said polyurethane layer which comprises superimposing a sheet of glass or glass composite and a sheet of the self-healing polyurethane to be joined to the glass, and a sheet of hard plastic, of rectangular dimensions and a surface area of about 0.1 to 1.0% of the total surface area of the polyurethane layer, with an adhesive coating or layer between the hard plastic label support and the polyurethane sheet, said label support located in a delineated area of the polyurethane sheet which is convenient for label attachment;
- and subjecting the entire assembly to the action of heat and pressure in an autoclave in order to produce a finished laminate having an outer surface of self-healing polyurethane with a hard plastic label support affixed to said polyurethane surface.
- View Dependent Claims (12, 13, 14, 15)
Specification