Patent US4861630A successfully refreshed from Google Patents.
US4861630A
Expired / Lapsed
US
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Multilayered articles formed by coextrusion of polycarbonate and polyester
Assignee: General Electric Co
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Filing: 1987-12-30
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Granted: 1989-08-29
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Expires: 2007-12-30
Abstract
Abstract The present invention relates to a multilayer article formed by the coextrusion of a polyester and polycarbonate. The polyester and polycarbonate are extruded into a film wherein the polyester forms the top and bottom layers of the film and the polycarbonate becomes the inner layer. The films may be thermoformed into articles which exhibit excellent strength and impact values.
Inventors
- 👤 James M. Mihalich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:11
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/36; B32B27/06; B32B27/08; B32B27/365; B32B2307/00; B32B2307/70; B32B2307/704; B32B2367/00; B32B2369/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/31504; Y10T428/31507; Y10T428/31786
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
75 words
A multilayer article comprising two outer layers and a middle layer, said outer layers comprising a polyester resin of the formula: ##STR5## where b represents a whole number in excess of 1, R is a divalent alkylene radical containing from 1 to 10 or more carbon atoms, and the two carbonyl groups are located on the aromatic ring in a para- or meta- position relative to each other, said middle layer comprising a polycarbonate resin.
Claim 2
Dependent Claim
75 words
A multilayer article comprising two outer layers and a middle layer, said outer layers comprising a polyester resin of the formula: ##STR5## where b represents a whole number in excess of 1, R is a divalent alkylene radical containing from 1 to 10 or more carbon atoms, and the two carbonyl groups are located on the aromatic ring in a para- or meta- position relative to each other, said middle layer comprising a polycarbonate resin.
Claim 3
Dependent Claim
18 words
The multilayer article of claim 1, wherein said article is in the form of a film or container.
Claim 4
Dependent Claim
12 words
The multilayer article of claim 2, wherein said article is a film.
Claim 5
Dependent Claim
14 words
The multilayer article of claim 3, wherein said article consists essentially of three layers.
Claim 6
Dependent Claim
11 words
The multilayer article of claim 3, wherein the film is thermoformed.
Claim 7
Dependent Claim
17 words
The multilayer article of claim 5, wherein the polyester in the thermoformed film is crystallized by heating.
Claim 8
Dependent Claim
19 words
The multilayer article of claim 1 wherein the polycarbonate is derived from a dihydric phenol and a carbonate precursor.
Claim 9
Dependent Claim
20 words
The multilayer article of claim 7, wherein said dihydric phenol is 2,2-bis(4-hydroxyphenyl) propane and the carbonate precursor is carbonyl chloride.
Claim 10
Dependent Claim
19 words
The multilayer article of claim 7, wherein said dihydric phenol is 2,2-bis(4-hydroxyphenol)propane and the carbonate precursors is diphenyl carbonate.
Claim 11
Dependent Claim
35 words
The multilayer article of claim 2, wherein the polycarbonate contains recurring structural units of the formula: ##STR6## where Y is a divalent aromatic radical of the dihydric phenol employed in the polycarbonate procarbonate producing reaction.
Claim 12
Dependent Claim
66 words
The multilayer article of claim 1, wherein said polycarbonate is a polyphthalate carbonate prepared from a dihydric phenol, a carbonate precursor, a terephthalic acid or ester-forming derivative thereof, an isophthalic acid or ester-forming derivative thereof, said polyphthalate carbonate having from about 70 to 95 weight percent ester content and a range of terephthalate groups ranging from about 2 to about 15 percent of the ester content.
Claim 13
Dependent Claim
17 words
The multilayer article of claim 11, wherein the weight percent ester content is from 75 to 90.
Claim 14
Dependent Claim
23 words
The multilayer article of claim 12, wherein the range of terephthalate groups range about 5 to about 10 percent of the ester content.
Claim 15
Dependent Claim
12 words
The multilayer article of claim 1, wherein the polyester is polyethylene terephthalate.
Claim 16
Dependent Claim
12 words
The multilayer article of claim 1, wherein the polyester is polybutylene terephthalate.
Claim 17
Dependent Claim
12 words
The multilayer article of claim 1, wherein the polyester is polycyclohexylene terephthalate.
Claim 18
Dependent Claim
33 words
The multilayer article of claim 1, wherein the outer two layers are from about 0.4 to about 30 mils thick and the middle layer is from about 0.1 to about 30 mils thick.
Claim 19
Dependent Claim
33 words
The multilayer article of claim 1, wherein the outer two layers are from about 5 to about 20 mils thick and the middle layer is from about 3 to about 10 mils thick.
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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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |