Patent US4478964A successfully refreshed from Google Patents.
US4478964A
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Polycarbonate-silicate compositions
Assignee: Bayer Corp
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Filing: 1981-12-29
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Granted: 1984-10-23
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Expires: 2001-12-29
Abstract
Abstract Polycarbonate compositions comprising an aromatic polycarbonate resin, wherein dispersed are silicate particulates, are particularly suitable for the preparation of films having a 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
2026-10-30 19:48
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
49 words
A polycarbonate film comprising (i) an aromatic thermoplastic polycarbonate resin, (ii) between 0.025 to 1 phr of a silicate having an average particle size of about 0.05 to about 20 microns, said silicate selected from the group consisting of hydrous alumino silicates, anhydrous alumino silicates, sillimanite minerals and wollastonite.
Claim 2
Dependent Claim
49 words
A polycarbonate film comprising (i) an aromatic thermoplastic polycarbonate resin, (ii) between 0.025 to 1 phr of a silicate having an average particle size of about 0.05 to about 20 microns, said silicate selected from the group consisting of hydrous alumino silicates, anhydrous alumino silicates, sillimanite minerals and wollastonite.
Claim 3
Dependent Claim
11 words
The film of claim 1 wherein said silicate is calcined clay.
Claim 4
Dependent Claim
16 words
The film of claim 1 wherein said particle size is about 0.075 to about 5 microns.
Claim 5
Dependent Claim
15 words
The film of claim 1 wherein said said silicate is treated with a coupling agent.
Claim 6
Dependent Claim
13 words
The film of claim 1 wherein said (i) is a bisphenol-A based polycarbonate.
Claim 7
Dependent Claim
15 words
The film of claim 1 having a thickness of about 10 mils or less. polycarbonate.
Claim 8
Dependent Claim
64 words
In the solution cast process for the preparation of films, the improvement comprising using a polycarbonate composition comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.025 to 1.0 phr of a silicate having an average particle size of about 0.05 to about 20 microns, said silicate selected from the group consisting of hydrous alumino silicates, anhydrous alumino silicates, sillimanite minerals and wollastonite.
Claim 9
Dependent Claim
64 words
In the solution cast process for the preparation of films, the improvement comprising using a polycarbonate composition comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.025 to 1.0 phr of a silicate having an average particle size of about 0.05 to about 20 microns, said silicate selected from the group consisting of hydrous alumino silicates, anhydrous alumino silicates, sillimanite minerals and wollastonite.
Claim 10
Dependent Claim
11 words
The process of claim 7, wherein said silicate is calcined clay.
Claim 11
Dependent Claim
14 words
The process of claim 7, wherein said silicate is treated with a coupling agent.
Claim 12
Dependent Claim
63 words
In the extrusion process for the preparation of films, the improvement comprising using a polycarbonate composition comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.025 to 1.0 phr of a silicate having an average particle size of about 0.05 to about 20 microns, said silicate selected from the group consisting of hydrous alumino silicates, anhydrous alumino silicates, sillimanite minerals and wollastonite.
Claim 13
Dependent Claim
63 words
In the extrusion process for the preparation of films, the improvement comprising using a polycarbonate composition comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.025 to 1.0 phr of a silicate having an average particle size of about 0.05 to about 20 microns, said silicate selected from the group consisting of hydrous alumino silicates, anhydrous alumino silicates, sillimanite minerals and wollastonite.
Claim 14
Dependent Claim
11 words
The process of claim 10, wherein said silicate is calcined clay.
Claim 15
Dependent Claim
14 words
The process of claim 10, wherein said silicate is treated with a coupling agent.
Claim 16
Dependent Claim
64 words
In the blow molding process for the preparation of films, the improvement comprising using a polycarbonate composition comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.025 to 1.0 phr of a silicate having an average particle size of about 0.05 to about 20 microns, said silicate selected from the group consisting of hydrous alumino silicates, anhydrous alumino silicates, sillimanite minerals and wollastonite.
Claim 17
Dependent Claim
64 words
In the blow molding process for the preparation of films, the improvement comprising using a polycarbonate composition comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.025 to 1.0 phr of a silicate having an average particle size of about 0.05 to about 20 microns, said silicate selected from the group consisting of hydrous alumino silicates, anhydrous alumino silicates, sillimanite minerals and wollastonite.
Claim 18
Dependent Claim
11 words
The process of claim 13, wherein said silicate is calcined clay.
Claim 19
Dependent Claim
14 words
The process of claim 13, wherein said silicate is treated with a coupling agent.
Claim 20
Dependent Claim
50 words
A polycarbonate film comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.025 to 1.0 phr of a silicate having an average particle size of about 0.075 to about 15 microns, said silicate selected from the group consisting of hydrous alumino silicates, anhydrous alumino silicates, sillimanite minerals and wollastonite.
Claim 21
Dependent Claim
50 words
A polycarbonate film comprising (i) an aromatic thermoplastic polycarbonate resin, and (ii) between 0.025 to 1.0 phr of a silicate having an average particle size of about 0.075 to about 15 microns, said silicate selected from the group consisting of hydrous alumino silicates, anhydrous alumino silicates, sillimanite minerals and wollastonite.
Claim 22
Dependent Claim
13 words
The films of claim 16 having thicknesses of about 10 mils or less.
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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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |