Patent US4168256A successfully refreshed from Google Patents.
US4168256A
Expired / Lapsed
US
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PVC molding composition
Assignee: RCA Corp
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Filing: 1978-01-13
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Granted: 1979-09-18
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Expires: 1998-01-13
Abstract
Abstract Compounds of the formula <IMAGE> wherein n independently at each occurrence and m are integers are excellent lubricants for PVC molding compositions.
Inventors
- 👤 Sarwan K. Khanna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:42
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L71/00; C08L71/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
In a polyvinyl chloride molding composition for molding of discs having audio and/or video information thereon comprising a PVC polymer containing effective amounts of a stabilizer, plasticizer, processing aid and lubricant, the improvement wherein the lubricant includes a compound of the formula ##STR3## whose molecular weight is in the range of at least about 4000 and wherein n independently at each occurrence and m are integers.
Claim 2
Dependent Claim
66 words
In a polyvinyl chloride molding composition for molding of discs having audio and/or video information thereon comprising a PVC polymer containing effective amounts of a stabilizer, plasticizer, processing aid and lubricant, the improvement wherein the lubricant includes a compound of the formula ##STR3## whose molecular weight is in the range of at least about 4000 and wherein n independently at each occurrence and m are integers.
Claim 3
Dependent Claim
27 words
A molding composition according to claim 1 wherein the lubricant is present in amounts of from about 0.2 to 1 percent by weight of the molding composition.
Claim 4
Dependent Claim
17 words
A molding composition according to claim 1 wherein said lubricant has a molecular weight of about 4000.
Claim 5
Independent Claim
69 words
A method of formulating a molding composition for molding of discs having audio and/or video information thereon including a polymer of vinyl chloride, a stabilizer, a plasticizer, a processing aid and a lubricant which comprises adding a lubricating amount of a compound of the formula ##STR4## whose molecular weight is in the range of at least about 4000 and wherein n independently at each occurrence and m are integers.
Claim 6
Independent Claim
69 words
A method of formulating a molding composition for molding of discs having audio and/or video information thereon including a polymer of vinyl chloride, a stabilizer, a plasticizer, a processing aid and a lubricant which comprises adding a lubricating amount of a compound of the formula ##STR4## whose molecular weight is in the range of at least about 4000 and wherein n independently at each occurrence and m are integers.
References Cited (Backward Citations)
US2393512A
Cited
US2657186A
Cited
US2668801A
Cited
US2958669A
Cited
US3385912A
Cited
DE2244922A1
Cited
US3933709A
Cited
US3856739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |