Patent US4510196A successfully refreshed from Google Patents.
US4510196A
Expired / Lapsed
US
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Polycarbonate compositions containing powdered sulfates
Assignee: Bayer Corp
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Filing: 1982-09-20
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Granted: 1985-04-09
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Expires: 2002-09-20
Abstract
Abstract Polycarbonate compositions comprising an aromatic polycarbonate resin wherein dispersed are powdered sulfates, are particularly suitable for the preparation of films characterized by their low coefficient of static friction, high light transmission and virtual freedom from haze.
Inventors
- 👤 Russell P. Carter, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:48
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/30
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
77 words
A clear film having a thickness of less than 10 mils comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.025 to about 1.0 phr of sulfate powder having an average particle size of about 0.5 to about 15 microns said film being characterized in that its moisture content is not in excess of 2% relative to its weight and in that its light transmission measured in accordance with ASTM D-1003-61 is not less than 91.4%.
Claim 2
Dependent Claim
77 words
A clear film having a thickness of less than 10 mils comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.025 to about 1.0 phr of sulfate powder having an average particle size of about 0.5 to about 15 microns said film being characterized in that its moisture content is not in excess of 2% relative to its weight and in that its light transmission measured in accordance with ASTM D-1003-61 is not less than 91.4%.
Claim 3
Dependent Claim
21 words
The film of claim 1, wherein said sulfate powder is selected from the group consisting of calcium sulfate and barium sulfate.
Claim 4
Dependent Claim
18 words
The film of claim 1 or 2, wherein said particle size is about 0.5 to about 13 microns.
Claim 5
Dependent Claim
15 words
The film of claim 1, wherein said sulfate powder is treated with a coupling agent.
Claim 6
Dependent Claim
14 words
The film of claim 1 or 4, wherein said (i) is a bisphenol-based polycarbonate.
Claim 7
Dependent Claim
73 words
In the process for the preparation of clear films having a thickness of less than 10 mils, the improvement comprising using a polycarbonate composition comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.025 to 1 phr of sulfate powder having an average particle size of about 0.5 to about 15 microns said polycarbonate composition being characterized in that its moisture content is not in excess of 2% relative to its weight.
Claim 8
Dependent Claim
73 words
In the process for the preparation of clear films having a thickness of less than 10 mils, the improvement comprising using a polycarbonate composition comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.025 to 1 phr of sulfate powder having an average particle size of about 0.5 to about 15 microns said polycarbonate composition being characterized in that its moisture content is not in excess of 2% relative to its weight.
Claim 9
Dependent Claim
11 words
The improvement of claim 6, wherein said process is solution casting.
Claim 10
Dependent Claim
10 words
The improvement of claim 6, wherein said process is extrusion.
Claim 11
Dependent Claim
11 words
The improvement of claim 6, wherein said process is blow molding.
Claim 12
Dependent Claim
27 words
The improvement of claim 6 or 7 or 8 or 9 wherein said sulfate powder is selected from the group consisting of calcium sulfate and barium sulfate.
Claim 13
Dependent Claim
21 words
The improvement of claim 6 or 7 or 8 or 9 wherein said sulfate powder is treated with a coupling agent.
Claim 14
Dependent Claim
25 words
The film of claim 1, wherein said sulfate powder is selected from the group consisting of calcium sulfate, barium sulfate, strontium sulfate and radium sulfate.
Claim 15
Dependent Claim
13 words
The film of claim 1 having thicknesses of about 10 mils or less.
Claim 16
Dependent Claim
77 words
A clear film having a thickness of less than 10 mils comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.25 to about 1.0 phr of sulfate powder having an average particle size of about 0.5 to about 15 microns said film being characterized in that its moisture content is not in excess of 2% relative to its weight and in that its haze as measured in accordance with ASTM D-1003-61 is not more than 1.7%.
Claim 17
Dependent Claim
77 words
A clear film having a thickness of less than 10 mils comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.25 to about 1.0 phr of sulfate powder having an average particle size of about 0.5 to about 15 microns said film being characterized in that its moisture content is not in excess of 2% relative to its weight and in that its haze as measured in accordance with ASTM D-1003-61 is not more than 1.7%.
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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) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |