US4086410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic molding composition comprising a terpolymer of α-methylstyrene, methyl methacrylate and N-vinyl-2-pyrrolidone
Assignee: Polysar Inc
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Filing: 1976-05-10
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Granted: 1978-04-25
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Expires: 1996-05-10
Abstract
Abstract A thermoplastic molding composition comprising a terpolymer having a weight ratio of from about 20 to 50, preferably 20 to 30, parts α-methylstyrene, about 79 to 40, preferably 73 to 67, parts methyl methacrylate and about 1 to 10, preferably 3 to 6, parts N-vinyl-2-pyrrolidone. A particularly preferred terpolymer composition includes 25 parts α-methylstyrene, 70 parts methyl methacrylate and 5 parts N-vinyl-2-pyrrolidone. Thermoplastic molding compositions embodying this invention are characterized by excellent transparency, high flow rates and resistance to deformation at high temperatures.
Inventors
- 👤 Il H. Song
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:52
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
41 words
A transparent, high heat thermoplastic molding composition having improved melt flow characteristics, comprising a terpolymer having a weight ratio of from about 20 to 50 parts α-methylstyrene, about 79 to 40 parts methyl methacrylate, and about 1 to 10 parts N-vinyl-2-pyrrolidone.
Claim 2
Dependent Claim
41 words
A transparent, high heat thermoplastic molding composition having improved melt flow characteristics, comprising a terpolymer having a weight ratio of from about 20 to 50 parts α-methylstyrene, about 79 to 40 parts methyl methacrylate, and about 1 to 10 parts N-vinyl-2-pyrrolidone.
Claim 3
Dependent Claim
26 words
The thermoplastic molding composition of claim 1 wherein the weight ratio of α-methylstyrene to methyl methacrylate to N-vinyl-2-pyrrolidone in said terpolymer is from about 20-30:73-67:3-6, respectively.
Claim 4
Dependent Claim
23 words
The thermoplastic molding composition of claim 1 wherein said terpolymer comprises about 25 parts α-methylstyrene, 70 parts methyl methacrylate and 5 parts N-vinyl-2-pyrrolidone.
Claim 5
Dependent Claim
69 words
The thermoplastic molding composition of claim 1 wherein said terpolymer has a haze value according to ASTM D-1003 of less than about 10 percent, a heat deflection temperature under load according to ASTM D-648-72 of greater than about 120° C. and melt flows at 230° C. according to ASTM D-1238 under 1.2 kg. and 3.8 kg. loads of greater than about 1 and 8 grams per 10 minutes respectively.
Claim 6
Dependent Claim
104 words
A thermoplastic molding composition possessing transparency, high melt flow and high heat deflection temperatures comprising a terpolymer having a weight ratio of from about 20 to 30 parts α-methylstyrene, 73 to 67 parts methyl methacrylate, and about 3 to 6 parts N-vinyl-2-pyrrolidone, said composition possessing a haze value according to ASTM D-1003 of less than about 10 percent, a heat deflection temperature under load according to ASTM D-648-72 of greater than about 120° C. and melt flow values at 230° C. according to ASTM D-1238-65T under 1.2 kg. and 3.8 kg. loads of greater than about 0.5 and 2.0 grams per 10 minutes respectively.
Claim 7
Dependent Claim
104 words
A thermoplastic molding composition possessing transparency, high melt flow and high heat deflection temperatures comprising a terpolymer having a weight ratio of from about 20 to 30 parts α-methylstyrene, 73 to 67 parts methyl methacrylate, and about 3 to 6 parts N-vinyl-2-pyrrolidone, said composition possessing a haze value according to ASTM D-1003 of less than about 10 percent, a heat deflection temperature under load according to ASTM D-648-72 of greater than about 120° C. and melt flow values at 230° C. according to ASTM D-1238-65T under 1.2 kg. and 3.8 kg. loads of greater than about 0.5 and 2.0 grams per 10 minutes respectively.
Claim 8
Dependent Claim
46 words
The composition of claim 5 wherein said terpolymer contains about 25 parts α-methylstyrene, about 70 parts methyl methacrylate, and about 5 parts N-vinyl-2-pyrrolidone and possesses melt flow values under said 1.2 and 3.8 kg. loads of greater than 1 and 8 grams per 10 minutes respectively.
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) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |