US4399061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of video disc molding composition
Assignee: RCA Corp
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Filing: 1981-10-14
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Granted: 1983-08-16
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Expires: 2001-10-14
Abstract
Abstract An improvement in preparing PVC resin based conductive molding compositions suitable for the manufacture of capacitive high density information discs wherein isopropyl alcohol is added to ingredients to be dry blended thus substantially reducing the amount of powder which accumulates on the inner surface of the mixing vessel during blending.
Inventors
- 👤 Paulo Sickert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:40
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C08; C08J; C08J3/00; C08J3/20; C08J3/203; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
In a process for preparing a conductive vinyl chloride resin based molding composition containing at least about 12 percent by weight of conductive carbon black particles wherein certain components of said composition, including said resin and carbon black, are mixed in the dry state in a mixing vessel, said mixing having the tendency to deposit powder onto the inner surface of said vessel, the improvement comprising adding to said dry components an amount of isopropyl alcohol sufficient to substantially reduce the amount of powder deposited on said surface during mixing, but not exceeding about 2 percent by weight of said composition.
Claim 2
Dependent Claim
101 words
In a process for preparing a conductive vinyl chloride resin based molding composition containing at least about 12 percent by weight of conductive carbon black particles wherein certain components of said composition, including said resin and carbon black, are mixed in the dry state in a mixing vessel, said mixing having the tendency to deposit powder onto the inner surface of said vessel, the improvement comprising adding to said dry components an amount of isopropyl alcohol sufficient to substantially reduce the amount of powder deposited on said surface during mixing, but not exceeding about 2 percent by weight of said composition.
Claim 3
Dependent Claim
29 words
A process in accordance with claim 1, wherein the amount of isopropyl alcohol added comprises from about 0.5 to about 1.5 percent by weight of said conductive molding composition.
Claim 4
Dependent Claim
25 words
A process in accordance with claim 1, wherein the amount of isopropyl alcohol added comprises about 1 percent by weight of said conductive molding composition.
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) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |