US4745029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent blends of polymethyl methacrylate and BPA polycarbonate
Assignee: General Electric Co
•
Filing: 1986-10-06
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Granted: 1988-05-17
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Expires: 2006-10-06
Abstract
Abstract Transparent blends of polymethyl methacrylate and BPA polycarbonate are provided resulting from solution casting and melt blending procedures. The blends are useful as glazing materials and for making optical disks and other injection moldable articles for which an easy flow polycarbonate is desirable.
Inventors
- 👤 Roger P. Kambour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:30
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; C08L69/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31645; Y10T428/31649
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A method for making a transparent blend of BPA polycarbonate, and polymethyl methacrylate having a lower critical solution temperature of at least 140° C. which comprises (A) solution blending 25 to 95 parts of a BPA polycarbonate having an intrinsic viscosity in chloroform of from 0.35 to 1.8 dl./g. at 25° C. and 75 to 5 parts of a polymethyl methacrylate having a weight average molecular weight as determined by membrane osmometry and gel permeation chromatography of from 10×10 3 to 500×10 3 in an organic solvent, (B) applying the resulting solution onto a substrate to a thickness of up to one mil per pass, and (C) allowing the organic solvent to evaporate to produce a transparent polycarbonate/polymethyl methacrylate blend.
Claim 2
Independent Claim
120 words
A method for making a transparent blend of BPA polycarbonate, and polymethyl methacrylate having a lower critical solution temperature of at least 140° C. which comprises (A) solution blending 25 to 95 parts of a BPA polycarbonate having an intrinsic viscosity in chloroform of from 0.35 to 1.8 dl./g. at 25° C. and 75 to 5 parts of a polymethyl methacrylate having a weight average molecular weight as determined by membrane osmometry and gel permeation chromatography of from 10×10 3 to 500×10 3 in an organic solvent, (B) applying the resulting solution onto a substrate to a thickness of up to one mil per pass, and (C) allowing the organic solvent to evaporate to produce a transparent polycarbonate/polymethyl methacrylate blend.
Claim 3
Dependent Claim
86 words
Transparent blends of BPA polycarbonate and polymethyl methacrylate made in accordance with claim 1, having lower critical solution temperatures of at least 140° C. which comprise by weight (A) 25 to 95 parts of BPA polycarbonate having an intrinsic viscosity in chloroform of from 0.35 to 1.8 dl./g. at 25° C., and (B) 75 to 5 parts of a polymethyl methacrylate having a weight average molecular weight M W of from about 10×10 3 to 500×10 3 as determined by membrane osmometry and gel permeation chromatography.
Claim 4
Dependent Claim
23 words
A transparent blend in accordance with claim 1 where the polymethyl methacrylate is a polymethyl methacrylate which is made by free radical polymerization.
Claim 5
Dependent Claim
17 words
A transparent blend in accordance with claim 1 where the polymethyl methacrylate is made by anionic polymerization.
References Cited (Backward Citations)
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JPS49353A
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JPS50135157A
Cited
US4336348A
Cited
US4595729A
Cited
US4461868A
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EP0137686A2
Cited
US4540623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |