US4085166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact resistant acrylic polymer composition
Assignee: Wyeth Holdings LLC
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Filing: 1977-05-18
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Granted: 1978-04-18
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Expires: 1997-05-18
Abstract
Abstract A molding composition of improved toughness, thermal stability, flow and stress craze resistance comprising (A) from about 70 to about 95% of a resinous terpolymer of 65 to 75 parts of methylmethacrylate, 18 to 24 parts of styrene and 2 to 12 parts of ethylacrylate and (B) 5% to 30% of polybutadiene grafted with 17 to 22 parts of methylmethacrylate, 4 to 7 parts of styrene and 0 to 3 parts of ethylacrylate, the ratio of polybutadiene to monomer in (B) ranging from 1:1 to 4:1, respectively.
Inventors
- 👤 Roland Ralph DiLeone
- 👤 Albert George Robustelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:42
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; C08L51/00; C08L51/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A molding composition characterized by exhibiting excellent toughness, thermal stability, flow and stress craze resistance comprising (A) from about 70% to about 95% of a resinous terpolymer comprising from about 65 to 75 parts of methylmethacrylate, from about 18 to 24 parts of styrene and from about 2 to 12 parts of ethylacrylate and (B) from about 5% to about 30% of polybutadiene grafted with from about 17 to 22 parts of methylmethacrylate, from about 4 to 7 parts of styrene and 0 to 3 parts of ethylacrylate, the ratio of polybutadiene to monomer in (B) ranging from about 1:1 to about 4:1, respectively
Claim 2
Dependent Claim
104 words
A molding composition characterized by exhibiting excellent toughness, thermal stability, flow and stress craze resistance comprising (A) from about 70% to about 95% of a resinous terpolymer comprising from about 65 to 75 parts of methylmethacrylate, from about 18 to 24 parts of styrene and from about 2 to 12 parts of ethylacrylate and (B) from about 5% to about 30% of polybutadiene grafted with from about 17 to 22 parts of methylmethacrylate, from about 4 to 7 parts of styrene and 0 to 3 parts of ethylacrylate, the ratio of polybutadiene to monomer in (B) ranging from about 1:1 to about 4:1, respectively
Claim 3
Dependent Claim
25 words
A composition according to claim 1 wherein (A) is a terpolymer of 73 parts of methylmethacrylate, 22 parts of styrene and 5 parts of ethyacrylate.
Claim 4
Dependent Claim
25 words
A composition according to claim 1 wherein (A) is a terpolymer of 69.5 parts of methylmethacrylate, 22.5 parts of styrene and 8 parts of ethylacrylate.
Claim 5
Dependent Claim
21 words
A composition according to claim 1 wherein (B) is polybutadiene grafted with 19.6 parts of methylmethacrylate and 5.4 parts of styrene.
Claim 6
Dependent Claim
15 words
A composition according to claim 1 wherein the polybutadiene to monomer ratio is 3:1, respectively.
Claim 7
Dependent Claim
14 words
A composition according to claim 1 containing 80% of (A) and 20% of (B).
Claim 8
Dependent Claim
40 words
A composition according to claim 1 wherein (A) is a terpolymer of 73 parts of methylmethacrylate, 22 parts of styrene and 5 parts of ethylacrylate and (B) is polybutadiene grafted with 19.6 parts of methylmethacrylate and 5.4 parts of styrene.
Claim 9
Dependent Claim
40 words
A composition according to claim 1 wherein (A) is a terpolymer of 69.5 parts of methylmethacrylate, 22.5 parts of styrene and 8 parts of ethylacrylate and (B) is polybutadiene grafted with 19.6 parts of methylmethacrylate and 5.4 parts of styrene.
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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |