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US4035548A
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Laminated articles prepared from transparent, non-blooming poly(lactone-urethane) interlayers
Assignee: PPG Industries Inc
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Filing: 1976-09-30
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Granted: 1977-07-12
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Expires: 1996-09-30
Abstract
Abstract Energy-absorbing interlayers and glass laminates prepared therefrom for use as automobile windshields and other safety glass applications are disclosed. The interlayers are made from a poly(lactone-urethane) in which the molecular weight and structure of the lactone moiety is carefully controlled so as to get optimum energy-absorbing and optical properties.
Inventors
- 👤 Wen-Hsuan Chang
- 👤 Vernon G. Ammons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:19
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/1077; B32B17/10009; B32B17/10018; B32B17/10036; B32B17/10688; B32B17/10761; B32B17/10779; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4266; C08G18/4269; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/664; C08G18/6644; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/758; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/56; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2605/00; B32B2605/006; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31573; Y10T428/31598; Y10T428/31601; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
155 words
An energy-absorbing laminate comprising at least one rigid transparent sheet laminated to a flexible non-blooming layer of a polyurethane comprising the polymerizate of: (A) an organic polyisocyanate, (B) a polylactone polyol having a hydroxyl number within the range of 62 to 140 inclusive formed from polymerizing an unsubstituted lactone having 6 to 8 carbon atoms with an organic polyhydroxyl-containing compound selected from the class consisting of: (1) aliphatic diols free of alkyl substitution and oxyalkylated products of these diols, (2) a hydroxyl-terminated polyester having a hydroxyl number below 600 formed from an organic polycarboxylic acid containing from 3 to 10 carbon atoms and aliphatic diols free of alkyl substitution and oxyalkylated products of these diols, (C) a compound containing at least two active hydrogens per molecule reactive with the isocyanate group having a molecular weight less than 250 selected from the class consisting of aliphatic diols free of alkyl substitution, aliphatic triols and mixtures thereof.
Claim 2
Dependent Claim
155 words
An energy-absorbing laminate comprising at least one rigid transparent sheet laminated to a flexible non-blooming layer of a polyurethane comprising the polymerizate of: (A) an organic polyisocyanate, (B) a polylactone polyol having a hydroxyl number within the range of 62 to 140 inclusive formed from polymerizing an unsubstituted lactone having 6 to 8 carbon atoms with an organic polyhydroxyl-containing compound selected from the class consisting of: (1) aliphatic diols free of alkyl substitution and oxyalkylated products of these diols, (2) a hydroxyl-terminated polyester having a hydroxyl number below 600 formed from an organic polycarboxylic acid containing from 3 to 10 carbon atoms and aliphatic diols free of alkyl substitution and oxyalkylated products of these diols, (C) a compound containing at least two active hydrogens per molecule reactive with the isocyanate group having a molecular weight less than 250 selected from the class consisting of aliphatic diols free of alkyl substitution, aliphatic triols and mixtures thereof.
Claim 3
Dependent Claim
14 words
The energy-absorbing laminate of claim 1 in which the rigid transparent sheet is glass.
Claim 4
Dependent Claim
30 words
An energy-absorbing laminate comprising layers of rigid transparent sheets selected from the class consisting of glass, polycarbonate and acrylic bonded to one another with the polyurethane layer of claim 1.
Claim 5
Dependent Claim
29 words
An energy-absorbing laminate comprising two rigid transparent sheets sandwiching a composite layer consisting essentially of a sheet of polyvinyl butyral bonded to a sheet of polyurethane of claim 1.
Claim 6
Dependent Claim
26 words
The energy-absorbing laminate of claim 1 in which a layer of normally blooming polyurethane is positioned between the rigid transparent sheets and the non-blooming polyurethane layer.
Claim 7
Dependent Claim
29 words
The laminate of claim 1 in which the polyurethane layer has a thickness of from 15 to 60 mils (38.10× 10 - 5 to 152.40× 10 - 5 m).
Claim 8
Dependent Claim
36 words
The laminate of claim 1 in which the polyurethane layer is of substantially uniform thickness and the rate of change in thickness within the interlayer is sufficiently small to produce a diopter of less than 0.006.
Claim 9
Dependent Claim
25 words
The laminate of claim 1 in which the polyurethane layer has a light transmission of at least 70 percent and less than 2 percent haze.
Claim 10
Dependent Claim
111 words
The laminate of claim 1 which has a mean penetration velocity at 0° F., 70° F. and 120° F. (-18° C., 21° C. and 49° C.) of at least 20 miles per hour (32.180 km/hr) when an approximately 0.030-0.040 inch (0.0762× 10 - 2 to 0.1016× 10 - 2 m) thick polyurethane layer is laminated to a 1/8 inch (0.3175× 10 - 2 m) thick 12 inch by 12 inch (30.48× 10 - 2 m by 30.48×10 -2 m) float glass sheet to form a bilayer laminate and the laminate is held rigid and impacted on the polyurethane side with a 5-pound (22.675× 10 - 1 kg) freely falling steel ball.
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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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |