US4129536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinyl chloride based injection molding composition
Assignee: RCA Corp
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Filing: 1977-07-25
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Granted: 1978-12-12
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Expires: 1997-07-25
Abstract
Abstract A vinyl chloride based injection molding composition comprises a vinyl chloride-propylene copolymer, a mercapto tin stabilizer, an acrylic processing aid and an ester wax lubricant. This composition has excellent flow characteristics and can form molded articles with sub-micron dimensional details and excellent surface characteristics.
Inventors
- 👤 Carl J. Martin
- 👤 Robert J. Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:17
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L33/00; C08L33/04; C08L33/06; C08L33/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
96 words
An injection molding composition comprising a vinyl chloride-propylene copolymer containing about 6-8 percent by weight of propylene; from about 1-3 percent by weight of the molding composition of a solid mercapto tin stabilizer; from about 1-3 percent by weight of the molding composition of an acrylic resin processing aid; and a mixture of from about 0.25-1 percent by weight of the molding composition of an ester wax of a monofatty acid and alcohol lubricant and from about 0.1-0.5 percent by weight of the molding composition of an ester wax of a polyfunctional acid and alcohol lubricant.
Claim 2
Dependent Claim
96 words
An injection molding composition comprising a vinyl chloride-propylene copolymer containing about 6-8 percent by weight of propylene; from about 1-3 percent by weight of the molding composition of a solid mercapto tin stabilizer; from about 1-3 percent by weight of the molding composition of an acrylic resin processing aid; and a mixture of from about 0.25-1 percent by weight of the molding composition of an ester wax of a monofatty acid and alcohol lubricant and from about 0.1-0.5 percent by weight of the molding composition of an ester wax of a polyfunctional acid and alcohol lubricant.
Claim 3
Dependent Claim
12 words
A composition according to claim 1 wherein the stabilizer is dibutyl tin-β-mercaptopropionate.
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) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |