US3884858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing of thermoplastic polyesters
Assignee: Novartis Corp
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Filing: 1972-03-27
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Granted: 1975-05-20
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Expires: 1992-03-27
Abstract
Abstract The invention relates to the use of thermoplastic moulding materials based on saturated polyesters for moulding by processes in which the material comes into contact with heated metal surfaces while it is solidifying. The thermoplastic moulding materials according to the invention consist of A. A SATURATED POLYESTER B. POLYDIMETHYLSILOXANES AND/OR C. A SYNTHETIC WAX.
Inventors
- 👤 Gottfried Morawetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:53
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A PROCESS OF MOLDING SATURATED POLYESTER BY CONTACTING A LIQUID COMPOSITION WITH A HEATED METAL SURFACE DURING SOLIDIFYING SAID COMPOSITION CONSISTING ESSENTIALLY OF A. LINEAR SATURATED POLYESTER FROM AROMATIC DICARBOXYLIC ACID AND B. POLYDIMETHYL SILOXANE HAVING A VISCOSITY OF 35 TO 200 CST, IN AN AMOUNT OF 0.25 TO 0.8 WEIGHT PERCENT IN RELATION TO THE WEIGHT OF THE POLYESTER, OR C. A SYNTHETIC WAX PRODUCED BY THE ZIEGLER PROCESS WITH A SOLIDIFICATION POINT AT 109*-114*C, A MOLECULAR WEIGHT OF ABOUT 1,600 AND A VISCOSITY OF 110-130 CP AT 150*C, IN AN AMOUNT OF 0.5 TO 6 PERCENT IN RELATION TO THE POLYESTER, AND D. MIXTURES OF (A), (B) AND (C).
Claim 2
Dependent Claim
111 words
A PROCESS OF MOLDING SATURATED POLYESTER BY CONTACTING A LIQUID COMPOSITION WITH A HEATED METAL SURFACE DURING SOLIDIFYING SAID COMPOSITION CONSISTING ESSENTIALLY OF A. LINEAR SATURATED POLYESTER FROM AROMATIC DICARBOXYLIC ACID AND B. POLYDIMETHYL SILOXANE HAVING A VISCOSITY OF 35 TO 200 CST, IN AN AMOUNT OF 0.25 TO 0.8 WEIGHT PERCENT IN RELATION TO THE WEIGHT OF THE POLYESTER, OR C. A SYNTHETIC WAX PRODUCED BY THE ZIEGLER PROCESS WITH A SOLIDIFICATION POINT AT 109*-114*C, A MOLECULAR WEIGHT OF ABOUT 1,600 AND A VISCOSITY OF 110-130 CP AT 150*C, IN AN AMOUNT OF 0.5 TO 6 PERCENT IN RELATION TO THE POLYESTER, AND D. MIXTURES OF (A), (B) AND (C).
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said polyester is polyethylene terephthalate.
Claim 4
Dependent Claim
27 words
The process of claim 2 wherein said siloxane has a viscosity of 60 to 120 cSt and said siloxane is present at 0.4 to 0.6 weight percent.
Claim 5
Dependent Claim
17 words
The process of claim 2 wherein said synthetic wax is present at 1 to 4 weight percent.
Claim 6
Dependent Claim
9 words
The product produced by the process of claim 1.
References Cited (Backward Citations)
US3140268A
Cited
US3193516A
Cited
US3563941A
Cited
US3405198A
Cited
US3516957A
Cited
US3660557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |