US4671838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of bilayer laminate and preformed sheet for use therein
Assignee: Saint Gobain Vitrage SA
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Filing: 1986-08-25
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Granted: 1987-06-09
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Expires: 2006-08-25
Abstract
Abstract Preformed, energy-absorbing, scratch resistant, optical, flexible, and self-healing polyurethane sheets, which are adhesive under the influence of heat and pressure; bilayer glazing laminates and bilayer safety windshields including said sheets; wherein said polyurethane sheet is prepared preferably by reactive-casting on a horizontal support and formed preferably from a polyisocyanate monomer including about 2 to about 10 wt. % of urea groups.
Inventors
- 👤 Jean L. Bravet
- 👤 Daniel Colmon
- 👤 Gerard Daude
- 👤 Michel J. Moncheaux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:26
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; B32B17/1055; B32B17/1077; B32B17/10807; B32B17/10899; B32B17/10908; B32B27/00; B32B27/04; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6603; C08G18/6607; C08G18/6611; C08G18/6625; C08G18/70; C08G18/72; C08G18/73; C08G18/74; C08G18/75; C08G18/751; C08G18/752; C08G18/753; C08G18/755; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7825; C08J2375/00; C08J2375/04; C08J2375/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31554; Y10T428/31573; Y10T428/31576; Y10T428/31598; Y10T428/31601
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
157 words
A method for preparing a glazing laminate comprising: (1) providing a horizontally supported preformed sheet by forming on a horizontal support a liquid film comprising a solvent-free mixture of monomers capable of forming a polyurethane and a polyurethane-forming catalyst; (2) maintaining said liquid film at a temperature and for a time sufficient to permit the formation of a uniformly thick and level film; (3) raising the temperature of said uniformly level liquid film and maintaining the film at an elevated temperature sufficient to fully polymerize the film into a solid polyurethane sheet within less than about one hour while it is positioned on said horizontal support; (4) removing said solid polyurethane sheet from said horizontal support; (5) contacting one surface of a glass or rigid plastic ply with the surface of said sheet opposite the surface formed in contact with said horizontal support, thereby forming an assembly; and (6) treating said assembly at elevated temperature and pressure.
Claim 2
Independent Claim
157 words
A method for preparing a glazing laminate comprising: (1) providing a horizontally supported preformed sheet by forming on a horizontal support a liquid film comprising a solvent-free mixture of monomers capable of forming a polyurethane and a polyurethane-forming catalyst; (2) maintaining said liquid film at a temperature and for a time sufficient to permit the formation of a uniformly thick and level film; (3) raising the temperature of said uniformly level liquid film and maintaining the film at an elevated temperature sufficient to fully polymerize the film into a solid polyurethane sheet within less than about one hour while it is positioned on said horizontal support; (4) removing said solid polyurethane sheet from said horizontal support; (5) contacting one surface of a glass or rigid plastic ply with the surface of said sheet opposite the surface formed in contact with said horizontal support, thereby forming an assembly; and (6) treating said assembly at elevated temperature and pressure.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein said horizontal support is coated with a release agent.
Claim 4
Dependent Claim
109 words
A glazing laminate comprising a preformed sheet including an energy-absorbing polyurethane ply adhered to a glass or rigid plastic ply wherein the adhesion between said preformed sheet and said ply is greater than about 2 daN/5 cm and less than about 15 daN/5 cm, said polyurethane ply being prepared by reactive casting, on a level horizontal support, a reaction mixture including: an isocyanate component, having a viscosity of less than 5000 mPaS at 40° C., and comprising an aliphatic diisocyanate, a cycloaliphatic diisocyanate or an isocyanate prepolymer; and, a polyol component comprising a polymeric diol having a MW of about 500 to about 4000, and a short chain diol.
Claim 5
Dependent Claim
109 words
A glazing laminate comprising a preformed sheet including an energy-absorbing polyurethane ply adhered to a glass or rigid plastic ply wherein the adhesion between said preformed sheet and said ply is greater than about 2 daN/5 cm and less than about 15 daN/5 cm, said polyurethane ply being prepared by reactive casting, on a level horizontal support, a reaction mixture including: an isocyanate component, having a viscosity of less than 5000 mPaS at 40° C., and comprising an aliphatic diisocyanate, a cycloaliphatic diisocyanate or an isocyanate prepolymer; and, a polyol component comprising a polymeric diol having a MW of about 500 to about 4000, and a short chain diol.
Claim 6
Dependent Claim
21 words
A glazing laminate according to claim 3 wherein said ply of energy-absorbing polyurethane is greater than or about 0.4 mm thick.
Claim 7
Dependent Claim
17 words
A bilayer glazing laminate according to claim 3 wherein said sheet is adhered to a glass ply.
Claim 8
Dependent Claim
49 words
A bilayer glazing laminate which exhibits optical, energy-absorbing, moisture and temperature resistant, and abrasion resistant properties as required by ANSI Z26, Test Nos. 1, 2, 3, 4, 9, 12, 17, 26, and 28 comprising a preformed sheet according to claim 3 adhered to a glass or rigid plastic ply.
Claim 9
Dependent Claim
15 words
A bilayer glazing laminate according to claim 6 wherein said preformed sheet has self-healing properties.
Claim 10
Dependent Claim
7 words
A safety windshield according to claim 7.
Claim 11
Dependent Claim
118 words
A glazing laminate comprising a glass or rigid plastic sheet and a preformed transparent energy-absorbing polyurethane ply having surface properties including a scratch resistance of greater than 20 g as measured by the Erichsen 413 apparatus and an abrasion resistance of less than 4% haze as measured according to ECE Regulation No. 43, said polyurethane ply being prepared by reactive casting, on a level horizontal support, a reaction mixture including: an isocyanate component, having a viscosity of less than 5000 mPaS at 40° C., and comprising an aliphatic diisocyanate, a cycloaliphatic diisocyanate or an isocyanate prepolymer; and, a polyol component comprising a polymeric diol having a MW of about 500 to about 4000, and a short chain diol.
Claim 12
Dependent Claim
118 words
A glazing laminate comprising a glass or rigid plastic sheet and a preformed transparent energy-absorbing polyurethane ply having surface properties including a scratch resistance of greater than 20 g as measured by the Erichsen 413 apparatus and an abrasion resistance of less than 4% haze as measured according to ECE Regulation No. 43, said polyurethane ply being prepared by reactive casting, on a level horizontal support, a reaction mixture including: an isocyanate component, having a viscosity of less than 5000 mPaS at 40° C., and comprising an aliphatic diisocyanate, a cycloaliphatic diisocyanate or an isocyanate prepolymer; and, a polyol component comprising a polymeric diol having a MW of about 500 to about 4000, and a short chain diol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |