Patent US4062887A successfully refreshed from Google Patents.
US4062887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent, optically clear poly(lactone-urethane) interlayers for laminated safety glass
Assignee: PPG Industries Inc
•
Filing: 1975-12-11
•
Granted: 1977-12-13
•
Expires: 1995-12-11
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 09:58
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/1077; B32B17/10688; B32B17/10779; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4266; C08G18/4286; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/664; C08G18/6644
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
83 words
A poly(lactone-ester) polyol having a hydroxyl number within the range of 62 to 140 inclusive formed from ring opening a lactone having 6 to 8 carbon atoms with a hydroxy-terminated polyester having a hydroxyl number below 600 formed from an aliphatic polycarboxylic acid containing from 3 to 10 carbon atoms and a polyol selected from the class consisting of aliphatic diols free of alkyl substitution, cycloaliphatic diols and aliphatic triols containing from 2 to 10 carbon atoms and oxyalkylated products of these polyols.
Claim 2
Dependent Claim
83 words
A poly(lactone-ester) polyol having a hydroxyl number within the range of 62 to 140 inclusive formed from ring opening a lactone having 6 to 8 carbon atoms with a hydroxy-terminated polyester having a hydroxyl number below 600 formed from an aliphatic polycarboxylic acid containing from 3 to 10 carbon atoms and a polyol selected from the class consisting of aliphatic diols free of alkyl substitution, cycloaliphatic diols and aliphatic triols containing from 2 to 10 carbon atoms and oxyalkylated products of these polyols.
Claim 3
Dependent Claim
73 words
The poly(lactone-ester) polyol of claim 1 which has the following structural formula: ##STR7## where m has a value of between 1 to 6, n is an integer of from 4 to 6, R' is an aliphatic moiety free of alkyl substitution containing from 2 to 10 carbon atoms, R" is an aliphatic moiety containing from 3 to 10 carbon atoms and x + y is a number which ranges from 2 to 16.
References Cited (Backward Citations)
US3654347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |