US4544706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly impact resistant carbonate polymer blends
Assignee: Dow Chemical Co
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Filing: 1983-11-14
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Granted: 1985-10-01
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Expires: 2003-11-14
Abstract
Abstract Carbonate polymer compositions comprise extruded blends of a carbonate polymer and a copolymer consisting essentially of a monovinylidene aromatic comonomer and an α,β-ethylenically unsaturated comonomer having a polar group. Optionally, a small amount of monovinylidene copolymer can be blended with said composition. Such compositions exhibit high impact strengths, improve the melt processability of the carbonate polymer and are advantageously highly transparent and exhibit low haze.
Inventors
- 👤 Charles R. Finch
- 👤 Leslie E. Wallace
- 👤 Thomas E. Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:33
CPC Classifications
C; C08; C08L; C08L69/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
122 words
An extruded sheet-like thermoplastic composition comprising a continuous phase comprising a carbonate polymer, and a discontinuous phase comprising a copolymer of a monovinylidene aromatic comonomer and an α,β-ethylenically unsaturated comomoner having a pendant polar group and monovinylidene aromatic homopolymer; and wherein said copolymer is employed in amounts sufficient to improve the melt processability of the carbonate polymer; and wherein said discontinuous phase comprising a copolymer is in the form of laminar layers distributed within the continuous phase, which layers are essentially parallel to the surface of said sheet-like material; and wherein said copolymer is present in the composition in proportions such that said composition exhibits a Rheometrics Dart impact strength which nearly meets or exceeds that of the essentially pure carbonate polymer.
Claim 2
Dependent Claim
122 words
An extruded sheet-like thermoplastic composition comprising a continuous phase comprising a carbonate polymer, and a discontinuous phase comprising a copolymer of a monovinylidene aromatic comonomer and an α,β-ethylenically unsaturated comomoner having a pendant polar group and monovinylidene aromatic homopolymer; and wherein said copolymer is employed in amounts sufficient to improve the melt processability of the carbonate polymer; and wherein said discontinuous phase comprising a copolymer is in the form of laminar layers distributed within the continuous phase, which layers are essentially parallel to the surface of said sheet-like material; and wherein said copolymer is present in the composition in proportions such that said composition exhibits a Rheometrics Dart impact strength which nearly meets or exceeds that of the essentially pure carbonate polymer.
Claim 3
Dependent Claim
9 words
An extruded composition of claim 1 which is transparent.
Claim 4
Dependent Claim
14 words
A composition of claim 1 wherein said carbonate polymer is a polycarbonate of bisphenol-A.
Claim 5
Dependent Claim
14 words
A composition of claim 2 wherein said carbonate polymer is a polycarbonate of bisphenol-A.
Claim 6
Dependent Claim
32 words
A composition of claim 1 wherein said copolymer consists essentially of about 1 to about 30 weight percent α,β-ethylenically unsaturated comonomer and about 70 to about 99 weight percent monovinylidene aromatic comonomer.
Claim 7
Dependent Claim
32 words
A composition of claim 2 wherein said copolymer consists essentially of about 1 to about 8 weight percent α,β-ethylenically unsaturated comonomer and about 92 to about 99 weight percent monovinylidene aromatic comonomer.
Claim 8
Dependent Claim
10 words
A composition of claim 1 wherein said copolymer is styrene/acrylonitrile.
Claim 9
Dependent Claim
28 words
A composition of claim 7 wherein said copolymer consists essentially of about 15 to about 20 weight percent acrylonitrile, and from about 80 to 85 weight percent styrene.
Claim 10
Dependent Claim
10 words
A composition of claim 2 wherein said copolymer is styrene/acrylonitrile.
Claim 11
Dependent Claim
28 words
A composition of claim 9 wherein said copolymer consists essentially of about 5 to about 7 weight percent acrylonitrile and about 93 to about 95 weight percent styrene.
Claim 12
Dependent Claim
11 words
A composition of claim 1 wherein said copolymer is styrene/acrylic acid.
Claim 13
Dependent Claim
11 words
A composition of claim 2 wherein said copolymer is styrene/acrylic acid.
Claim 14
Dependent Claim
29 words
A composition of claim 12 wherein said copolymer consists essentially of about 1 to about 8 weight percent acrylic acid and about 92 to about 99 weight percent styrene.
Claim 15
Dependent Claim
24 words
A composition of claim 1 such that said composition exhibits a Rheometrics Dart impact strength which exceeds that of the essentially pure carbonate polymer.
Claim 16
Dependent Claim
24 words
A composition of claim 2 such that said composition exhibits a Rheometrics Dart impact strength which exceeds that of the essentially pure carbonate polymer.
Claim 17
Dependent Claim
12 words
A composition of claim 1 wherein said monovinylidene aromatic homopolymer is polystyrene.
Claim 18
Dependent Claim
38 words
A composition of claim 1 wherein said copolymer consists essentially of from about 1 to about 15 weight percent of said α,β-ethylenically unsaturated comonomer and from about 85 to about 99 weight percent of said monovinylidene aromatic comonomer.
Claim 19
Dependent Claim
38 words
A composition of claim 1 wherein said copolymer consists essentially of from about 10 to about 25 weight percent of said α,β-ethylenically unsaturated comonomer and from about 75 to about 90 weight percent of said monovinylidene aromatic comonomer.
Claim 20
Dependent Claim
39 words
A composition of claim 1 wherein said copolymer and said monovinylidene aromatic homopolymer are present in proportions in the composition such that said composition exhibits a Rheometrics Dart impact strength which exceeds that of the essentially pure carbonate polymer.
Claim 21
Dependent Claim
39 words
A composition of claim 2 wherein said copolymer and said monovinylidene aromatic polymer are present in proportions in the composition such that said composition exhibits a Rheometrics Dart impact strength which exceeds that of the essentially pure carbonate polymer.
References Cited (Backward Citations)
US3239582A
Cited
US3801673A
Cited
US3880783A
Cited
JPS5334853A
Cited
JPS5734146A
Cited
US4439582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |