US4045269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent formable polyurethane polycarbonate lamination
Assignee: Fleet Capital Corp
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Filing: 1975-12-22
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Granted: 1977-08-30
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Expires: 1995-12-22
Abstract
Abstract A method for producing clear, cured transparent polycarbonate laminates comprises directly bonding a sheet of transparent thermosetting polyurethane sheet to a polycarbonate sheet to produce a laminate, heating the laminate above the softening point of the polycarbonate sheet, and forming the laminate to a desired curvature.
Inventors
- 👤 David Lehmann Voss
- 👤 William Albert Miller
- 👤 Ralph David Hermansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:32
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C51/00; B29C51/14; B29C53/00; B29C53/02; B29C53/04; B29C63/00; B32B1/00; B32B27/36; B32B27/365; B32B27/40; B32B38/00; B32B38/18; B32B38/1866; B29K; B29K2069/00; B29K2075/00; B29K2995/00; B29K2995/0018; B29K2995/0026; B29L; B29L2009/00; B32B2305/00; B32B2305/72; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/536; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T428/00; Y10T428/31504; Y10T428/31551
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
125 words
A method for producing a curved transparent polycarbonate laminate from a polycarbonate sheet comprising the steps of: a. preparing a substantially completely cured, rigid, transparent thermoset polyurethane sheet having a Shore D hardness less than about 70 and a tear strength greater than about 50 pli at temperatures greater than the temperature T 1 , the polycarbonate sheet heat deflection temperature, and less than the temperature T 2 , the polycarbonate sheet chain scission temperature; b. thereafter directly bonding the polyurethane sheet to the polycarbonate sheet to produce a laminate wherein the polyurethane sheet is an outer layer of the laminate; c. heating the laminate to at least T 1 and less than T 2 ; and d. forming the laminate to a desired curvature.
Claim 2
Independent Claim
125 words
A method for producing a curved transparent polycarbonate laminate from a polycarbonate sheet comprising the steps of: a. preparing a substantially completely cured, rigid, transparent thermoset polyurethane sheet having a Shore D hardness less than about 70 and a tear strength greater than about 50 pli at temperatures greater than the temperature T 1 , the polycarbonate sheet heat deflection temperature, and less than the temperature T 2 , the polycarbonate sheet chain scission temperature; b. thereafter directly bonding the polyurethane sheet to the polycarbonate sheet to produce a laminate wherein the polyurethane sheet is an outer layer of the laminate; c. heating the laminate to at least T 1 and less than T 2 ; and d. forming the laminate to a desired curvature.
Claim 3
Dependent Claim
20 words
The method claimed in claim 1 wherein preparing the polyurethane sheet comprises reacting aliphatic diisocyanates with saturated polyalkylene ether polyols.
Claim 4
Dependent Claim
23 words
The method claimed in claim 1 wherein the step of preparing the polyurethane sheet comprises reacting a cycloaliphatic polyisocyanate with polyalkylene ether polyols.
Claim 5
Dependent Claim
14 words
The method claimed in claim 3 wherein the cycloaliphatic polyisocyanate is a cycloaliphatic diisocyanate.
Claim 6
Dependent Claim
14 words
The method claimed in claim 4 wherein the cycloaliphatic diisocyanate is 4,4'-methylene-bis (cyclohexyl isocyanate).
Claim 7
Dependent Claim
22 words
The method claimed in claim 1 wherein the step of directly bonding comprises fusion bonding the polyurethane sheet to the polycarbonate sheet.
Claim 8
Dependent Claim
20 words
A method as claimed in claim 1 wherein the polycarbonate sheet is fabricated from a polycarbonate based upon 2,2-bis(4-hydroxy-phenyl) propane.
Claim 9
Dependent Claim
23 words
A method as claimed in claim 1 wherein the step of preparing comprises preparing a polyurethane sheet at least about 0.01 inch thick.
Claim 10
Independent Claim
116 words
A method for producing curved transparent polycarbonate laminates from polycarbonate sheet fabricated from a polycarbonate based upon 2,2-bis (4-hydroxy-phenyl) propane comprising the steps of: a. preparing a substantially completely cured, rigid, transparent thermoset polyurethane sheet having a Shore D hardness less than about 70 and a tear strength greater than about 50 pli at a temperature of from about 270° F to about 375° F; b. thereafter directly bonding the polyurethane sheet to the polycarbonate sheet to produce a laminate wherein the polyurethane sheet is an outer layer of the laminate; c. heating the laminate to at least about 270° F and less than about 375° F; and d. forming the laminate to a desired curvature.
Claim 11
Independent Claim
116 words
A method for producing curved transparent polycarbonate laminates from polycarbonate sheet fabricated from a polycarbonate based upon 2,2-bis (4-hydroxy-phenyl) propane comprising the steps of: a. preparing a substantially completely cured, rigid, transparent thermoset polyurethane sheet having a Shore D hardness less than about 70 and a tear strength greater than about 50 pli at a temperature of from about 270° F to about 375° F; b. thereafter directly bonding the polyurethane sheet to the polycarbonate sheet to produce a laminate wherein the polyurethane sheet is an outer layer of the laminate; c. heating the laminate to at least about 270° F and less than about 375° F; and d. forming the laminate to a desired curvature.
Claim 12
Dependent Claim
29 words
The method claimed in claim 9 wherein the step of preparing the polyurethane sheet comprises reacting one or more aliphatic polyisocyanates with one or more saturated polyalkylene ether polyols.
Claim 13
Dependent Claim
23 words
The method claimed in claim 9 wherein the step of preparing the polyurethane sheet comprises reacting a cycloaliphatic diisocyanate with polyalkylene ether polyols.
Claim 14
Dependent Claim
14 words
The method claimed in claim 11 wherein the cycloaliphatic diisocyanate is 4,4'-methylene-bis (cyclohexyl isocyanate).
Claim 15
Dependent Claim
22 words
The method claimed in claim 9 wherein the step of directly bonding comprises fusion bonding the polyurethane sheet to the polycarbonate sheet.
Claim 16
Independent Claim
129 words
A method for producing curved transparent polycarbonate laminates comprising the steps of: a. preparing a substantially completely cured, rigid, transparent thermoset polyurethane sheet with a Shore D hardness less than about 70 and a tear strength greater than about 50 pli at a temperature of from about 270° F to about 375° F, and having a thickness of at least about 0.01 inch, by reacting 4,4'-methylene-bis (cyclohexyl isocyanate) with saturated polyalkylene ether polyols; b. thereafter fusion bonding the polyurethane sheet to a polycarbonate sheet prepared from 2,2-bis (4-hydroxy-phenyl) propane to produce a laminate wherein the polyurethane sheet is an outer layer of the laminate; c. heating the laminate to at least about 270° F and less than about 375° F; and d. forming the laminate to a desired shape.
Claim 17
Independent Claim
129 words
A method for producing curved transparent polycarbonate laminates comprising the steps of: a. preparing a substantially completely cured, rigid, transparent thermoset polyurethane sheet with a Shore D hardness less than about 70 and a tear strength greater than about 50 pli at a temperature of from about 270° F to about 375° F, and having a thickness of at least about 0.01 inch, by reacting 4,4'-methylene-bis (cyclohexyl isocyanate) with saturated polyalkylene ether polyols; b. thereafter fusion bonding the polyurethane sheet to a polycarbonate sheet prepared from 2,2-bis (4-hydroxy-phenyl) propane to produce a laminate wherein the polyurethane sheet is an outer layer of the laminate; c. heating the laminate to at least about 270° F and less than about 375° F; and d. forming the laminate to a desired shape.
Claim 18
Independent Claim
149 words
A method for producing a curved transparent polycarbonate laminate from a polycarbonate sheet comprising the steps of: a. casting an uncured thermosetting polyurethane on the polycarbonate sheet; b. substantially completely curing the cast polyurethane into a rigid sheet at least about 0.01 inch thick on the polycarbonate sheet to directly bond the polyurethane to the polycarbonate sheet to produce a laminate wherein the polyurethane sheet is an outer layer of the laminate, and wherein the cured polyurethane sheet has a Shore D hardness less than about 70 and a tear strength greater than about 50 pli at temperatures greater than the temperature T 1 , the polycarbonate sheet heat deflection temperature, and less than the temperature T 2 , the polycarbonate sheet chain scission temperature; c. heating the laminate to at least T 1 and less than T 2 ; and d. forming the laminate to a desired curvature.
Claim 19
Independent Claim
149 words
A method for producing a curved transparent polycarbonate laminate from a polycarbonate sheet comprising the steps of: a. casting an uncured thermosetting polyurethane on the polycarbonate sheet; b. substantially completely curing the cast polyurethane into a rigid sheet at least about 0.01 inch thick on the polycarbonate sheet to directly bond the polyurethane to the polycarbonate sheet to produce a laminate wherein the polyurethane sheet is an outer layer of the laminate, and wherein the cured polyurethane sheet has a Shore D hardness less than about 70 and a tear strength greater than about 50 pli at temperatures greater than the temperature T 1 , the polycarbonate sheet heat deflection temperature, and less than the temperature T 2 , the polycarbonate sheet chain scission temperature; c. heating the laminate to at least T 1 and less than T 2 ; and d. forming the laminate to a desired curvature.
Claim 20
Dependent Claim
20 words
The method of claim 15, comprising the additional step of fusion bonding the cured polyurethane sheet to the polycarbonate sheet.
Claim 21
Dependent Claim
23 words
The method claimed in claim 15 wherein the step of curing the polyurethane sheet comprises reacting aliphatic diisocyanates with saturated polyalkylene ether polyols.
Claim 22
Dependent Claim
23 words
The method claimed in claim 15 wherein the step of curing the polyurethane sheet comprises reacting a cycloaliphatic polyisocyanate with polyalkylene ether polyols.
Claim 23
Dependent Claim
14 words
The method claimed in claim 18 wherein the cycloaliphatic polyisocyanate is a cycloaliphatic diisocyanate.
Claim 24
Dependent Claim
14 words
The method claimed in claim 19 wherein the cycloaliphatic diisocyanate is 4,4'-methylene-bis (cyclohexyl isocyanate).
Claim 25
Dependent Claim
21 words
A method as claimed in claim 15 wherein the polycarbonate sheet is fabricated from a polycarbonate based upon 2,2-bis (4-hydroxy-phenyl) propane.
Claim 26
Independent Claim
140 words
A method for producing curved transparent polycarbonate laminates from polycarbonate sheet fabricated from a polycarbonate based upon 2,2-bis (4-hydroxy-phenyl) propane comprising the steps of: a. casting an uncured thermosetting polyurethane on the polycarbonate sheet; b. substantially completely curing the cast polyurethane into a rigid sheet at least about 0.01 inch thick on the polycarbonate sheet to directly bond the polyurethane to the polycarbonate sheet to produce a laminate wherein the polyurethane sheet is an outer layer of the laminate, and wherein the cured polyurethane sheet has a Shore D hardness less than about 70 and a tear strength greater than about 50 pli at a temperatue of from about 270° F to about 375° F; c. heating the laminate to at least about 270° F and less than about 375° F; and d. forming the laminate to a desired curvature.
Claim 27
Independent Claim
140 words
A method for producing curved transparent polycarbonate laminates from polycarbonate sheet fabricated from a polycarbonate based upon 2,2-bis (4-hydroxy-phenyl) propane comprising the steps of: a. casting an uncured thermosetting polyurethane on the polycarbonate sheet; b. substantially completely curing the cast polyurethane into a rigid sheet at least about 0.01 inch thick on the polycarbonate sheet to directly bond the polyurethane to the polycarbonate sheet to produce a laminate wherein the polyurethane sheet is an outer layer of the laminate, and wherein the cured polyurethane sheet has a Shore D hardness less than about 70 and a tear strength greater than about 50 pli at a temperatue of from about 270° F to about 375° F; c. heating the laminate to at least about 270° F and less than about 375° F; and d. forming the laminate to a desired curvature.
Claim 28
Dependent Claim
20 words
The method of claim 22 comprising the additional step of fusion bonding the cured polyurethane sheet to the polycarbonate sheet.
Claim 29
Dependent Claim
29 words
The method claimed in claim 22 wherein the step of curing the cast polyurethane comprises reacting one or more aliphatic polyisocyanates with one or more saturated polyalkylene ether polyols.
Claim 30
Dependent Claim
23 words
The method claimed in claim 22 wherein the step of curing the cast polyurethane comprises reacting a cycloaliphatic diisocyanate with polyalkylene ether polyols.
Claim 31
Dependent Claim
14 words
The method claimed in claim 25 wherein the cycloaliphatic diisocyanate is 4,4'-methylene-bis (cyclohexyl isocyanate).
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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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |