US3907963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt extrusion
Assignee: Monsanto Co
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Filing: 1973-06-29
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Granted: 1975-09-23
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Expires: 1993-06-29
Abstract
Abstract In a screw mixer, interrupted feed-compression flights radially extending from the root of the screw along helical lines intermesh with interrupted feed-restraining flights radially extending from the barrel along reverse complementing helical lines with respect to the disposition of the feed-compression flights. As the screw is rotated, intensive shearing of the material being axially forwarded is accomplished in alternation with periods of substantially lower or no shearing. The apparatus is quite suitable for mixing and kneading a wax-like substance into a moving stream of molten synthetic fiber-forming polymer just prior to forming filaments therefrom.
Inventors
- 👤 Lawrence E Blackmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:37
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/06; D01D1/065; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/50; B29C48/68; B29C48/685; B29C48/687; B29C48/03; B29C48/05
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
122 words
IN THE PROCESS OF INCORPORATING A WAX INTO POLYAMIDE FILAMENTS INCLUDING THE STEPS OF MELTING POLYAMIDE IN SOLID PARTICULATE FORM AND CONVEYING THE RESULTING MOLTEN POLYMER IN A CONFINED ZONE, INJECTING A POLYALKOXYLATED WAX COMPOUND INTO THE MOLTEN POLYAMIDE IN THE AMOUNT OF ABOUT 2-10 PERCENT BY WEIGHT, AND THEREAFTER EXTRUDING THE RESULTING MIXTURE INTO TEXTILE CONTINUOUS FILAMENTS, THE IMPROVEMENT COMPRISING SUBJECTING THE MIXTURE OF MOLTEN POLYAMIDE AND WAX COMPOUND BEFORE EXTRUSION TO PLURALITY OF INTENSIVE SCISSOR SHEARINGS (INTERMITTENLY INTERRUPTED BY) IN ALTERNATION WITH LONGER PERIODS OF SUBSTANTIALLY NO SHEARING, WHEREBY THE WAX COMPOUND IS DISPERSED AS A SEPARATE AND DISTINCT PHASE IN THE FILAMENTS WITH AN ELONGATED ROD SIZE OF 0.05 TO 3 MICRONS IN DIAMETER AND 15-50 MICRONS IN LENGTH.
Claim 2
Dependent Claim
122 words
IN THE PROCESS OF INCORPORATING A WAX INTO POLYAMIDE FILAMENTS INCLUDING THE STEPS OF MELTING POLYAMIDE IN SOLID PARTICULATE FORM AND CONVEYING THE RESULTING MOLTEN POLYMER IN A CONFINED ZONE, INJECTING A POLYALKOXYLATED WAX COMPOUND INTO THE MOLTEN POLYAMIDE IN THE AMOUNT OF ABOUT 2-10 PERCENT BY WEIGHT, AND THEREAFTER EXTRUDING THE RESULTING MIXTURE INTO TEXTILE CONTINUOUS FILAMENTS, THE IMPROVEMENT COMPRISING SUBJECTING THE MIXTURE OF MOLTEN POLYAMIDE AND WAX COMPOUND BEFORE EXTRUSION TO PLURALITY OF INTENSIVE SCISSOR SHEARINGS (INTERMITTENLY INTERRUPTED BY) IN ALTERNATION WITH LONGER PERIODS OF SUBSTANTIALLY NO SHEARING, WHEREBY THE WAX COMPOUND IS DISPERSED AS A SEPARATE AND DISTINCT PHASE IN THE FILAMENTS WITH AN ELONGATED ROD SIZE OF 0.05 TO 3 MICRONS IN DIAMETER AND 15-50 MICRONS IN LENGTH.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the polymer is nylon-66.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein the wax has at least one long chain of repeating units of alkylene oxide.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |