Patent US4992322A successfully refreshed from Google Patents.
US4992322A
Expired / Lapsed
US
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Coextruded products with improved weatherability
Assignee: SABIC Global Technologies BV
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Filing: 1988-06-23
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Granted: 1991-02-12
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Expires: 2008-06-23
Abstract
Abstract A coextruded moisture resistant polycarbonate article has a relative thin moisture resistant, polyphthalate-carbonate layer adhered to a relatively thick aromatic polycarbonate corelayer. The coextruded article has the high degree of transparency of aromatic polycarbonates and the moisture resistance and haze resistance of polyphthalate-carbonate. Coextruded sheet and film of the present invention may be subsequently thermoformed without losses in the desirable properties thereof.
Inventors
- 👤 Herbert L. Curry
- 👤 Kirk L. Kimbel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:06
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/36; B32B27/365; C; C08; C08G; C08G63/00; C08G63/64; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7246; B32B2369/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
36 words
A coextruded article consisting essentially of: (a) an aromatic polycarbonate core layer consisting of a polycarbonate resin derived from 2,2-bis(4-hydroxyphenyl)propane and a carbonate precursor; and (b) a moisture resistant, polyphthalate-carbonate layer adhered to said core layer.
Claim 2
Dependent Claim
36 words
A coextruded article consisting essentially of: (a) an aromatic polycarbonate core layer consisting of a polycarbonate resin derived from 2,2-bis(4-hydroxyphenyl)propane and a carbonate precursor; and (b) a moisture resistant, polyphthalate-carbonate layer adhered to said core layer.
Claim 3
Dependent Claim
31 words
The article of claim 1 wherein said core layer has a thickness of from 10 to 500 mils, and said polyphthalate-carbonate layer has a thickness of from 1 to 10 mils.
Claim 4
Dependent Claim
72 words
The article of claim 2 wherein said polyphthalate-carbonate layer comprises a polyphthalate-carbonate resin prepared from a dihydric phenol, a carbonate precursor, a terephthalic acid or ester forming derivatives thereof, an isophthalic acid or ester forming derivatives thereof, said copolyphthalate-carbonate resin having from about 70 to about 95 weight percent ester content, said ester content being from about 2 to about 15 weight percent terephthalate and from about 85 to 98 percent isophthalate.
Claim 5
Dependent Claim
45 words
A coextruded article consisting essentially of: (a) an aromatic polycarbonate core layer consisting of a polycarbonate resin derived from 2,2-bis(4-hydroxyphenyl)propane and a carbonate precursor; and (b) two moisture resistant polyphthalate-carbonate layers adhered to said core layer, said core layer being located between said polyphthalate-carbonate layers.
Claim 6
Dependent Claim
45 words
A coextruded article consisting essentially of: (a) an aromatic polycarbonate core layer consisting of a polycarbonate resin derived from 2,2-bis(4-hydroxyphenyl)propane and a carbonate precursor; and (b) two moisture resistant polyphthalate-carbonate layers adhered to said core layer, said core layer being located between said polyphthalate-carbonate layers.
Claim 7
Dependent Claim
33 words
The coextruded articles of claim 4 wherein said core layer has a thickness of from 10 to 50 mils, said polyphthalate-carbonate layers each having a thickness of from about 1 to 10 mils.
Claim 8
Dependent Claim
72 words
The articles of claim 5 wherein said polyphthalate-carbonate layers comprises a polyphthalate-carbonate resin prepared from a dihydric phenol, a carbonate precursor, a terphthalic acid or ester forming derivatives thereof, an isophthalic acid or ester forming derivatives thereof, said copolyphthalate-carbonate resin having from about 70 to about 95 weight percent ester content, said ester content being from about 2 to about 15 weight percent terephthalate and from about 85 to 98 percent isophthalate.
Claim 9
Dependent Claim
11 words
The article of claim 1 wherein the carbonate precursor is phosgene.
Claim 10
Dependent Claim
11 words
The article of claim 4 wherein the carbonate precursor is phosgene.
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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) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |