US4241140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated safety glass with polyurethane film
Assignee: PPG Industries Inc
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Filing: 1978-04-12
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Granted: 1980-12-23
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Expires: 1998-04-12
Abstract
Abstract A transparent, elastomeric polyurethane useful as an interlayer in safety glass laminates is prepared by the reaction of an aromatic diisocyanate with a mixture of a polyalkylene ether glycol, a polycaprolactone triol, and a monomeric aliphatic diol.
Inventors
- 👤 Vernon G. Ammons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:54
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/1077; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/4018; C08G18/65; C08G18/66; C08G18/6603; C08G18/6607; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7614; C08G18/7621; C09; C09J; C09J175/00; C09J175/04; B32B2307/00; B32B2307/40; B32B2307/412; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31551; Y10T428/31598; Y10T428/31601
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
A method for making a laminated glass article comprising the steps of: a. casting into a sheet mold a single curable polyurethane reaction mixture which comprises: (1) a polytetramethylene ether glycol having a molecular weight from about 400 to about 2000, (2) a polycaprolactone triol having a molecular weight from about 300 to 1000; (3) a monomeric aliphatic diol having from 4 to 6 carbon atoms; and (4) an isomeric mixture of 2,4-toluene diisocyanate and 2,6-toluene diisocyanate; b. polymerizing the reaction mixture to form a self-supporting polyurethane sheet; c. removing the self-supporting polyurethane sheet from said mold; d. laminating said polyurethane sheet to a sheet of glass; and e. curing the polyurethane.
Claim 2
Independent Claim
112 words
A method for making a laminated glass article comprising the steps of: a. casting into a sheet mold a single curable polyurethane reaction mixture which comprises: (1) a polytetramethylene ether glycol having a molecular weight from about 400 to about 2000, (2) a polycaprolactone triol having a molecular weight from about 300 to 1000; (3) a monomeric aliphatic diol having from 4 to 6 carbon atoms; and (4) an isomeric mixture of 2,4-toluene diisocyanate and 2,6-toluene diisocyanate; b. polymerizing the reaction mixture to form a self-supporting polyurethane sheet; c. removing the self-supporting polyurethane sheet from said mold; d. laminating said polyurethane sheet to a sheet of glass; and e. curing the polyurethane.
Claim 3
Dependent Claim
53 words
The method according to claim 1, wherein the reaction mixture comprises: a. a polytetramethylene ether glycol having a molecular weight of about 1000; b. a polycaprolactone triol having a molecular weight of about 300; c. 1,4-butane diol; and d. an isomeric mixture of 2,4-toluene diisocyanate and at least about 35 percent 2,6-toluene diisocyanate.
Claim 4
Dependent Claim
27 words
The method according to claim 1, wherein the step of laminating the self-supporting polyurethane sheet to a sheet of glass is performed prior to curing the polyurethane.
Claim 5
Dependent Claim
26 words
The method according to claim 1 wherein the step of laminating the self-supporting sheet to a sheet of glass is performed subsequent to curing the polyurethane.
Claim 6
Dependent Claim
38 words
The method according to claim 3 or claim 4 wherein the polyurethane sheet is laminated between glass sheets at a temperature of about 300° F. (about 149° C.) and a pressure of about 200 pounds per square inch.
Claim 7
Dependent Claim
24 words
The method according to claim 5, wherein the thickness of the polyurethane sheet is from 20 to 60 mils (about 0.5 to 1.5 millimeters).
Claim 8
Dependent Claim
10 words
An article prepared according to the method of claim 6.
References Cited (Backward Citations)
US3169945A
Cited
US3509015A
Cited
US3620905A
Cited
US3878036A
Cited
US3931113A
Cited
US3881043A
Cited
US3764457A
Cited
US3808077A
Cited
US3775354A
Cited
US3900446A
Cited
US3900655A
Cited
US3989676A
Cited
US4035548A
Cited
US4024113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |