Patent US4732725A successfully refreshed from Google Patents.
US4732725A
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US
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Process and device for the production of a safety pane
Assignee: Saint Gobain Vitrage SA
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Filing: 1986-01-15
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Granted: 1988-03-22
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Expires: 2006-01-15
Abstract
Abstract A process for the production of a safety pane comprising a sheet of glass and at least one polyurethane-based layer having energy-absorbent properties. The polyurethane-based layer having energy-absorbent properties is formed directly on the sheet of glass by the reactive injection, under a pressure between 2 and 10 bars, between said sheet of glass and a rigid countermold, of a reactive mixture of an isocyanate component having a viscosity under 5000 centipoises at 40 degrees C. and a polyalcohol component, with the isocyanate component containing at least one aliphatic or cycloaliphatic diisocyanate, or a prepolymer of these isocyanates, with the polyalcohol component containing at least one long difunctional polyalcohol having a molecular mass between 500 and 4000 and at least one short diol as a chain extending agent.
Inventors
- 👤 Michel-Jean Moncheaux
- 👤 Francois De Toytot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:16
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/06; C03C27/10; B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/1077; B32B17/10807; B32B17/10899; B32B17/10908; B32B17/10917; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/751; C08G18/752; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31598; Y10T428/31601
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
140 words
Process for the production of a compound pane comprising a glass sheet and a transparent polyurethane-based layer thereon having energy-absorbent properties, characterized in that the polyurethane-based coating layer having energy absorbent properties is formed directly on the glass sheet by reactive injection molding, under a pressure between 2 and 10 bars, between said glass sheet and a rigid countermold, of a reactive mixtures of an isocyanate component having a viscosity under 5000 centipoises at 40 degrees C. and a polyalcohol component, with the isocyanate component containing at least one aliphatic or cycloaliphatic diisocyanate or a prepolymer of these isocyanates, with the polyalcohol component containing at least one long difunctional polyalcohol having a molecular mass between 500 and 4000 and at least one short diol as a chain extending agent and after polymerization of the reaction mixture, the countermold is removed.
Claim 2
Dependent Claim
140 words
Process for the production of a compound pane comprising a glass sheet and a transparent polyurethane-based layer thereon having energy-absorbent properties, characterized in that the polyurethane-based coating layer having energy absorbent properties is formed directly on the glass sheet by reactive injection molding, under a pressure between 2 and 10 bars, between said glass sheet and a rigid countermold, of a reactive mixtures of an isocyanate component having a viscosity under 5000 centipoises at 40 degrees C. and a polyalcohol component, with the isocyanate component containing at least one aliphatic or cycloaliphatic diisocyanate or a prepolymer of these isocyanates, with the polyalcohol component containing at least one long difunctional polyalcohol having a molecular mass between 500 and 4000 and at least one short diol as a chain extending agent and after polymerization of the reaction mixture, the countermold is removed.
Claim 3
Dependent Claim
27 words
Process according to claim 1, wherein the isocyanate componeny contains carbamide functions, with the carbamide content at most 10% of the total weight of the isocyanate component.
Claim 4
Dependent Claim
11 words
Process of claim 2, wherein the carbamide content is between 5-7%.
Claim 5
Dependent Claim
11 words
Process according to claim 1 wherein the isocyanate component contains 3-isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate.
Claim 6
Dependent Claim
43 words
Process according to claim 1 wherein the isocyanate component and the polyalcohol component of the polyurethane having energy-absorbent properties are taken in a quantity such that the ratio of the isocyanate equivalent groups to the equivalent hydroxyl groups is about equal to 1.
Claim 7
Dependent Claim
45 words
Process according to claim 1 wherein the proportions between the different polyalcohols are chosen such that the number of hydroxyl equivalent groups due to the short diol represents 20 to 70% of the total of the hydroxyl groups when the NCO/OH ratio is about 1.
Claim 8
Dependent Claim
39 words
Process according to claim 1 wherein the isocyanate component is formed essentially of 3-isocyanatomethyl- 3,5,5-trimethylcyclohexylisocyanate presenting carbamide groups and the polyalcohol component is formed essentially of polytetramethyeneglycol having a molecular mass of about 1000 and of butanediol - 1,4.
Claim 9
Dependent Claim
22 words
Process according to claim 1, wherein the polyalcohol component in addition comprises at least one polyalcohol having a functionality greater than 2.
Claim 10
Dependent Claim
19 words
Process according to claim 7, characterized in that the polyalcohol having a functionality greater than 2 is a triol.
Claim 11
Dependent Claim
48 words
Process according to claim 1 wherein for a total hydroxyl equivalent for a polyurethane polyalcohol component having energy absorbent properties, the long polyalcohol represents 0.30 to 0.45 equivalent, the short diol 0.2 to 0.7 equivalent and a polyalcohol having functionality greater than 2 from 0 to 0.35 equivalent.
Claim 12
Dependent Claim
27 words
Process according to claim 1, wherein the polyurethane layer having energy-absorbent properties contains additives including at least one of a catalyst, a layering agent, and a stabilizer.
Claim 13
Dependent Claim
22 words
Process according to claim 1, wherein the reactive mixture is injected into the mold with a pressure of 2 to 3 bars.
Claim 14
Dependent Claim
28 words
Process according to claim 1 wherein the layer having energy-absorbent properties is combined during the molding with at least one other layer made of glass or plastic material.
Claim 15
Dependent Claim
18 words
Process according to claim 13, wherein the other layer is made of plastic material having superior surface properties.
Claim 16
Dependent Claim
22 words
Process according to claim 13, wherein the layer having superior surface properties is formed in advance and is placed on the countermold.
Claim 17
Dependent Claim
19 words
Process according to claim 14, wherein the layer having superior surface properties is formed in advance by reactive spraying.
Claim 18
Dependent Claim
28 words
Process according to claims 14, wherein the layer having surface properties is formed by reactive spraying on the countermold, which has been previously treated with a separating agent.
Claim 19
Dependent Claim
38 words
Process according to claim 12, wherein the injected layer is combined during the molding with a compound structure, comprising a reinforcement sheet made of plastic material, which has been previously coated with a layer having superior surface properties.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |