US3620905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically clear thermoplastic polyurethanes
Assignee: Bayer Corp
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Filing: 1969-10-21
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Granted: 1971-11-16
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Expires: 1989-10-21
Abstract
Abstract Colorless, optically clear, thermoplastic polyurethanes prepared from diisocyanato-dicyclohexylmethane containing 10-100 percent trans-trans 4,4'' -methylenebis(cyclohexyl isocyanate) (PICM), a polyether or polyester glycol having a molecular weight of 5003,000 and a diol having a molecular weight below 250. The low molecular weight diol is reinforcing when the isocyanate contains 30 percent or less trans-trans PICM and nonreinforcing when the isocyanate contains greater than 30 percent trans-trans PICM. The polyurethanes are particularly suitable for use in laminates for safety and bullet-proof glass.
Inventors
- 👤 Leo Ahramjian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:03
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/1077; B32B27/40; B32B9/00; B32B9/005; B32B9/04; B32B9/045; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0895; C08G18/28; C08G18/65; C08G18/66; C08G18/6603; C08G18/6607; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/758; B32B2375/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31598; Y10T428/31601
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
20 words
A polyurethane of claim 1 wherein the isocyanate is 4,4''-methylenebis(cyclohexyl isocyanate) which is a liquid at 25* C. or less.
Claim 2
Dependent Claim
15 words
A polyurethane of claim 1 wherein the isocyanate contains about 20-30 percent trans-trans 4,4''-methylenebis(cyclohexyl isocyanate).
Claim 3
Dependent Claim
18 words
A polyurethane of claim 3 wherein the high molecular weight glycol has a molecular weight of about 600-2,000.
Claim 4
Dependent Claim
20 words
A polyurethane of claim 1 wherein the isocyanate is 4,4''-methylenebis(cyclohexyl isocyanate) which contains about 20-30 percent of the trans-trans isomer.
Claim 5
Dependent Claim
12 words
A polyurethane of claim 5 wherein the reinforcing diol is 1, 4-butanediol.
Claim 6
Dependent Claim
15 words
A polyurethane of claim 6 wherein the reaction is carried out by a one-shot process.
Claim 7
Dependent Claim
22 words
A polyurethane of claim 6 wherein the high molecular weight glycol is polytetramethyleneether glycol having a number average molecular weight of 600-2,000.
Claim 8
Dependent Claim
78 words
A polyurethane of claim 6 wherein the isocyanate contains about 20 percent of the trans-trans isomer, about 65 percent of the cis-trans isomer and about 15 percent of the cis-cis isomer of 4,4''-methylenebis(cyclohexyl isocyanate) and the high molecular weight glycol is polytetramethyleneether glycol having a molecular weight of about 1,000, said components being used in amounts such that there are from about 2.0-3.1 moles of the isocyanate and about 1.0-2.1 moles of 1,4-butanediol per mole of polytetramethyleneether glycol.
Claim 9
Dependent Claim
23 words
A laminated article consisting essentially of a layer of the polyurethane of claim 1 sandwiched between layers of transparent ceramic, glass or plastic.
Claim 10
Dependent Claim
12 words
A laminated article of claim 10 wherein the outer layers are glass.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |