US4024113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonate polyurethanes based on particular aliphatic/cycloaliphatic polycarbonates
Assignee: PPG Industries Inc
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Filing: 1976-04-28
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Granted: 1977-05-17
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Expires: 1996-04-28
Abstract
Abstract Energy-absorbing laminates for use as automobile windshields or other safety glass applications comprising a polycarbonate urethane and a sheet of glass are disclosed. The polyurethane is formed from a cycloaliphatic diisocyanate, a compound containing at least two active hydrogens per molecule and having a molecular weight below 250, and a special polycarbonate diol synthesized from a mixture of linear aliphatic and cycloaliphatic diols.
Inventors
- 👤 Vernon G. Ammons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:45
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; B32B17/1055; B32B17/1077; B32B17/10807; B32B17/10816; B32B17/10825; B32B17/10834; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/44; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G64/00; C08G64/02; C08G64/0208; C08G64/20; C08G64/30; C08G64/305; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/558; B32B2307/56; B32B2315/00; B32B2315/08; B32B2375/00; B32B2605/00; B32B2605/006; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31598; Y10T428/31601
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
63 words
In a method for reacting an aliphatic diol with a compound capable of reacting with the diol to effect the formation of a polycarbonate diol, the improvement which comprises using as the aliphatic diol a mixture of linear aliphatic and cycloaliphatic diols which mixture comprises: a. at least 30 mole percent linear aliphatic diol; and b. at least 10 mole percent cycloaliphatic diol.
Claim 2
Dependent Claim
63 words
In a method for reacting an aliphatic diol with a compound capable of reacting with the diol to effect the formation of a polycarbonate diol, the improvement which comprises using as the aliphatic diol a mixture of linear aliphatic and cycloaliphatic diols which mixture comprises: a. at least 30 mole percent linear aliphatic diol; and b. at least 10 mole percent cycloaliphatic diol.
Claim 3
Dependent Claim
45 words
The method as described in claim 1, wherein the proportion of linear aliphatic diol in the mixture ranges from about 50 to about 80 mole percent and the proportion of the cycloaliphatic diol in the mixture ranges from about 50 to about 20 mole percent.
Claim 4
Dependent Claim
15 words
The method as described in claim 2, wherein the linear aliphatic diol is 1,6 hexanediol.
Claim 5
Dependent Claim
14 words
The method as described in claim 2, wherein the cycloaliphatic diol is 1,4 cyclohexanedimethanol.
Claim 6
Dependent Claim
24 words
The method as described in claim 2, wherein the mixture comprises about 80 mole percent 1,6 hexanediol and about 20 mole percent 1,4 cyclohexanedimethanol.
Claim 7
Dependent Claim
11 words
The polycarbonate diol prepared according to the method of claim 2.
Claim 8
Dependent Claim
11 words
The polycarbonate diol prepared according to the method of claim 5.
Claim 9
Dependent Claim
23 words
The polycarbonate diol as described in claim 7, wherein the molecular weight of said polycarbonate diol is between about 1000 and about 3000.
Claim 10
Dependent Claim
45 words
A transparent, energy-absorbing polyurethane which is the reaction product of: a. an organic diisocyanate; b. an organic compound having two isocyanate-reactive hydrogens and a molecular weight less than about 250; and c. a polycarbonate diol prepared from a mixture of linear aliphatic and cycloaliphatic diols.
Claim 11
Dependent Claim
45 words
A transparent, energy-absorbing polyurethane which is the reaction product of: a. an organic diisocyanate; b. an organic compound having two isocyanate-reactive hydrogens and a molecular weight less than about 250; and c. a polycarbonate diol prepared from a mixture of linear aliphatic and cycloaliphatic diols.
Claim 12
Dependent Claim
40 words
A polyurethane as described in claim 9, wherein the polycarbonate diol is prepared from a mixture comprising from about 50 to about 80 mole percent of linear aliphatic diol and from about 50 to about 20 mole percent cycloaliphatic diol.
Claim 13
Dependent Claim
19 words
A polyurethane as described in claim 10, wherein the polycarbonate diol is prepared from a mixture comprising 1,6 hexanediol.
Claim 14
Dependent Claim
19 words
A polyurethane as described in claim 10, wherein the polycarbonate diol is prepared from a mixture comprising 1,4 cyclohexanedimethanol.
Claim 15
Dependent Claim
43 words
A polyurethane as described in claim 10, wherein the polycarbonate diol is prepared from a mixture comprising 50 to 80 mole percent 1,6 hexanediol and 50 to 20 mole percent 1,4 cyclohexanedimethanol and has a molecular weight between about 1000 and about 2000.
Claim 16
Dependent Claim
15 words
A polyurethane as described in claim 9, wherein the organic diisocyanate is a cycloaliphatic diisocyanate.
Claim 17
Dependent Claim
14 words
A polyurethane as described in claim 14, wherein the cycloaliphatic diisocyanate is 4,4'-methylene-bis-(cyclohexyl isocyanate).
Claim 18
Dependent Claim
28 words
A polyurethane as described in claim 9, wherein the organic compound having two isocyanate-reactive hydrogens and a molecular weight less than about 250 is a monomeric aliphatic diol.
Claim 19
Dependent Claim
19 words
A polyurethane as described in claim 10, wherein the ratio of a:b:c is about 2.40 to 4.60:1.40 to 3.60:1.00.
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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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |