US3975355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Films and sheets of polyester-polycarbonate blends
Assignee: Honeywell International Inc
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Filing: 1975-02-24
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Granted: 1976-08-17
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Expires: 1995-02-24
Abstract
Abstract This invention provides a film or sheet capable of being thermoformed into a shaped article and being formed from a blend of about 60 to 85 parts by weight of a polyethylene terephthalate having an intrinsic viscosity of at least about 0.90, about 15 to 40 parts by weight of a polycarbonate and about 5 to 20 parts by weight of a non-acidic silica filler, such as novaculite, the polyethylene terephthalate portion of the film or sheet having a degree of crystallinity in the range of about 20 to 40%. The present invention also provides compositions for forming such films and sheets and shaped articles thermoformed from such films or sheets, such as cook-in-trays. This invention also provides a process of forming such films or sheets.
Inventors
- 👤 Philip Stuart Bollen
- 👤 Surendra A. Amin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:38
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
79 words
A film or sheet capable of being thermoformed into a shaped article and being formed from a blend of, in approximate parts by weight, 60 to 85 parts of a polyethylene terephthalate having an intrinsic viscosity of at least about 0.90, 15 to 40 parts of polycarbonate and 5 to 20 parts of a non-acidic silica filler, the polyethylene terephthalate fraction of said film or sheet having a degree of crystallinity in the range of about 20 to 40%.
Claim 2
Dependent Claim
79 words
A film or sheet capable of being thermoformed into a shaped article and being formed from a blend of, in approximate parts by weight, 60 to 85 parts of a polyethylene terephthalate having an intrinsic viscosity of at least about 0.90, 15 to 40 parts of polycarbonate and 5 to 20 parts of a non-acidic silica filler, the polyethylene terephthalate fraction of said film or sheet having a degree of crystallinity in the range of about 20 to 40%.
Claim 3
Dependent Claim
36 words
A film or sheet in accordance with claim 1 including in approximate parts by weight, 65 to 80 parts of polyethylene terephthalate, 20 to 35 parts of polycarbonate and 5 and 15 parts of said filler.
Claim 4
Dependent Claim
14 words
A film or sheet in accordance with claim 1 wherein said filler is novaculite.
Claim 5
Dependent Claim
21 words
A film or sheet in accordance with claim 3 wherein said novaculite has a maximum particle size of about 100 microns.
Claim 6
Dependent Claim
13 words
A film or sheet in accordance with claim 1 including titanium dioxide pigment.
Claim 7
Dependent Claim
18 words
A film or sheet in accordance with claim 5 including about 1 to 5 weight percent titanium dioxide.
Claim 8
Dependent Claim
12 words
A shaped article thermoformed from the film or sheet of claim 1.
Claim 9
Dependent Claim
11 words
A cook-in-tray thermoformed from the film or sheet of claim 1.
Claim 10
Dependent Claim
45 words
A film and sheet forming composition comprising in approximate parts by weight, 60 to 85 parts of polyethylene terephthalate having an intrinsic viscosity of at least about 0.90, 15 to 40 parts of a polycarbonate and 5 to 20 parts of a non-acidic silica filler.
Claim 11
Dependent Claim
45 words
A film and sheet forming composition comprising in approximate parts by weight, 60 to 85 parts of polyethylene terephthalate having an intrinsic viscosity of at least about 0.90, 15 to 40 parts of a polycarbonate and 5 to 20 parts of a non-acidic silica filler.
Claim 12
Dependent Claim
12 words
A composition in accordance with claim 9 wherein said filler is novaculite.
Claim 13
Dependent Claim
33 words
A composition in accordance with claim 10 including in approximate parts by weight, 65 to 80 parts of said polyethylene terephthalate, 15 to 30 parts of polycarbonate and 5 to 15 parts novaculite.
Claim 14
Dependent Claim
19 words
A composition in accordance with claim 11 wherein said novaculite has a maximum particle size of about 100 microns.
Claim 15
Dependent Claim
18 words
A composition in accordance with claim 11 including about 1 to 5 percent by weight of titanium dioxide.
Claim 16
Dependent Claim
18 words
A composition comprising a polycarbonate and about 20 to 40 percent by weight of a non-acidic silica filler.
Claim 17
Dependent Claim
18 words
A composition comprising a polycarbonate and about 20 to 40 percent by weight of a non-acidic silica filler.
Claim 18
Dependent Claim
13 words
A composition in accordance with claim 14 wherein said silica filler is novaculite.
Claim 19
Dependent Claim
21 words
A composition in accordance with claim 15 wherein said novaculite has an average particle size of less than about 100 microns.
Claim 20
Dependent Claim
18 words
A composition in accordance with claim 16 including about 5 to 20 percent by weight of titanium dioxide.
Claim 21
Dependent Claim
18 words
A composition in accordance with claim 17 including about 25 to 35 percent by weight of said novaculite.
Claim 22
Dependent Claim
17 words
A film or sheet in accordance with claim 1 wherein said film or sheet is essentially non-oriented.
Claim 23
Dependent Claim
16 words
A film or sheet in accordance with claim 1 wherein said polycarbonate is poly(4,4'-isopropylidene diphenylene carbonate).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |