Patent US4595546A successfully refreshed from Google Patents.
US4595546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of elongated extruded cross-linked products
Assignee: Crompton and Knowles Corp
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Filing: 1983-11-14
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Granted: 1986-06-17
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Expires: 2003-11-14
Abstract
Abstract A method for the manufacture of a cross-linked extruded elongated product from polyethylene or other suitable polymer. The polymer is fed into the hopper of a screw extrusion machine. The polymer is heated and melted while being conveyed through the barrel of the screw extruder. A liquid silane compound which comprises a modified vinyl functional silane, a free-radical generator, and a condensation catalyst is carefully metered and injected into the melted polymer. The melted polymer and the liquid silane compound are then mixed and blended to obtain a uniform blended mixture thereof. The blended mixture is then extruded through an extrusion die to form an elongated product of a required final shape and the elongated product is then subjected to the action of moisture and heat until the polymer in the elongated product is cross-linked.
Inventors
- 👤 John R. Wheeler, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:15
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/465; B29C48/467; B29C48/468; B29C48/022; B29C48/285; B29C48/29; B29C48/375; B29C48/395; B29C48/03; B29C48/06; B29C48/09; B29K; B29K2101/00; B29K2101/10; B29K2105/00; B29K2105/0005; B29K2105/24; B29L; B29L2031/00; B29L2031/34; B29L2031/3462; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
The method of making a cross-linked extruded elongated product comprising: (a) metering into the hopper of a screw extruder which has a barrel and a screw extending from end to end of the barrel, a polymer capable of being cross-linked by the use of a liquid silane compound which comprises a modified vinyl functional silane, a free-radical generator, and a condensation catalyst; (b) conveying the polymer through the barrel of the extruder; (c) heating and melting while conveying the polymer through the barrel of the screw extruder; (d) metering and injecting a liquid silane compound comprising a modified vinyl functional silane, a free-radical generator, and a condensation catalyst into the melted polymer; (e) mixing and blending said silane compound and said melted polymer to obtain a uniform blended mixture thereof; (f) extruding said blended mixture through an extrusion die to form an elongated product of a required final shape; and (g) subjecting said elongated product to the action of moisture until said polymer is cross-linked.
Claim 2
Independent Claim
165 words
The method of making a cross-linked extruded elongated product comprising: (a) metering into the hopper of a screw extruder which has a barrel and a screw extending from end to end of the barrel, a polymer capable of being cross-linked by the use of a liquid silane compound which comprises a modified vinyl functional silane, a free-radical generator, and a condensation catalyst; (b) conveying the polymer through the barrel of the extruder; (c) heating and melting while conveying the polymer through the barrel of the screw extruder; (d) metering and injecting a liquid silane compound comprising a modified vinyl functional silane, a free-radical generator, and a condensation catalyst into the melted polymer; (e) mixing and blending said silane compound and said melted polymer to obtain a uniform blended mixture thereof; (f) extruding said blended mixture through an extrusion die to form an elongated product of a required final shape; and (g) subjecting said elongated product to the action of moisture until said polymer is cross-linked.
Claim 3
Dependent Claim
29 words
The method of making a cross-linked extruded elongated product set forth in claim 1 wherein the polymer is fed in to the hopper of the extruder in pellet form.
Claim 4
Dependent Claim
57 words
The method of making a cross-linked extruded elongated product set forth in claim 1 wherein the polymer is conveyed through said extruder by a screw having a solids channel and a melt channel separated by a barrier flight wherein the polymer is collected into the melt channel as it melts during its transportation through the extruder barrel.
Claim 5
Dependent Claim
32 words
The method of making a cross-linked extruded elongated product set forth in claim 1 wherein the liquid silane compound is injected into the polymer after substantially all of said polymer is melted.
Claim 6
Independent Claim
43 words
The method of making a cross-linked extruded elongated product as set forth in any one of claims 1 through 4 wherein the liquid silane compound and the polymer are mixed and blended in a rotary cavity transfer mixer before said mixture is extruded.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |