US5091133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous production process of high-strength and high-modulus polyolefin material
Assignee: Eneos Corp
•
Filing: 1989-12-18
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Granted: 1992-02-25
•
Expires: 2009-12-18
Abstract
Abstract A high-strength and high-modulus polyolefin material can be continuously produced from a polyolefin in a powder form by feeding the polyolefin powder between a combination of endless belts disposed in an up-and-down opposing relation, compression-molding the polyolefin powder at a temperature lower than the melting point of the polyolefin powder by means of a pressing device while holding the polyolefin powder between the endless belts and conveying the same, and then rolling and stretching the resultant compression-molded polyolefin. The pressing device is constructed of pressing platens and corresponding sets of rollers, which are all accommodated within the respective endless belts. The rollers in each set are connected together, and the sets of rollers are arranged movably in an endless fashion between the respective platens and the endless belts associated therewith.
Inventors
- 👤 Seizo Kobayashi
- 👤 Takashi Mizoe
- 👤 Yoshimu Iwanami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:48
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/003; B29C43/22; B29C43/228; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; B29C43/32; B29C43/44; B29C43/48; B29C2043/483; B29K; B29K2033/00; B29K2105/00; B29K2105/25; B29K2105/251
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
126 words
A process for the continuous production of a high-strength and high-modulus polyolefin material, which comprises: feeding a polyolefin in a powder form between a combination of endless belts disposed in an up-and-down opposing relation; compression-molding the polyolefin powder at a temperature lower than the melting point of the polyolefin powder by means of a pressing means while holding the polyolefin powder between the endless belts and conveying the same, said pressing means comprising pressing platens and corresponding sets of rollers, all accommodated within the respective endless belts, the rollers in each set being connected together, and said sets of rollers being arranged movably in an endless fashion between the respective platens and the endless belts associated therewith; and rolling the resultant compression-molded polyolefin, followed by stretching.
Claim 2
Dependent Claim
126 words
A process for the continuous production of a high-strength and high-modulus polyolefin material, which comprises: feeding a polyolefin in a powder form between a combination of endless belts disposed in an up-and-down opposing relation; compression-molding the polyolefin powder at a temperature lower than the melting point of the polyolefin powder by means of a pressing means while holding the polyolefin powder between the endless belts and conveying the same, said pressing means comprising pressing platens and corresponding sets of rollers, all accommodated within the respective endless belts, the rollers in each set being connected together, and said sets of rollers being arranged movably in an endless fashion between the respective platens and the endless belts associated therewith; and rolling the resultant compression-molded polyolefin, followed by stretching.
Claim 3
Dependent Claim
41 words
The process of claim 1, wherein the polyolefin is selected from the group consisting of homopolymers of α-olefins having 2-8 carbon atoms, copolymers of ethylene and α-olefins having 3-12 carbon atoms and copolymers of propylene and α-olefins having 4-12 carbon atoms.
Claim 4
Dependent Claim
19 words
The process of claim 2, wherein the polyolefin has a particle size distribution in a range of 10-2,000 μm.
Claim 5
Dependent Claim
24 words
The process of claim 1, wherein the endless belts have a belt thickness of 0.1-1.5 mm and a surface polished in a mirror-finished state.
Claim 6
Dependent Claim
15 words
The process of claim 4, wherein the rollers have an outer diameter of 5-30 mm.
Claim 7
Dependent Claim
31 words
The process of claim 1, wherein the endless belts have a running length of 30-400 cm and the press platens an average pressure of 0.1-20 kg/cm 2 to the endless belts.
Claim 8
Dependent Claim
36 words
The process of claim 2, wherein the compression-molding step is performed at 50° C. or higher where the polyolefin is a polyethylene polymer and at 90° C. or higher where the polyolefin is a polypropylene polymer.
Claim 9
Dependent Claim
42 words
The process of claim 2, wherein the temperature for the compression-molding step is maintained by a preheater provided in the proximity of at least one of the endless belts and a heating means applied to at least one of the press platen.
Claim 10
Dependent Claim
18 words
The process of claim 1, wherein the endless belts are driven at a running speed of 30-400 cm/min.
Claim 11
Dependent Claim
20 words
The process of claim 1, wherein the pressing means is fed with a pressure from at least one hydraulic cylinder.
Claim 12
Dependent Claim
22 words
The process of claim 1, wherein the compression-molded polyolefin is rolled at a deformation ratio of 1.2-20 in terms of rolling efficiency.
Claim 13
Dependent Claim
33 words
The process of claim 11, wherein the rolling step is performed at a rolling temperature in a range of at least 20° C. but lower than the melting point of the polyolefin powder.
Claim 14
Dependent Claim
35 words
The process of claim 1, wherein the thus-rolled polyolefin is stretched by pulling the same in accordance with a method selected from the group consisting of hot-air stretching, cylinder stretching, roll stretching and hot-platen stretching.
Claim 15
Dependent Claim
17 words
The process of claim 13, wherein the stretching is performed in a temperature range of 20°-150° C.
Claim 16
Dependent Claim
31 words
The process of claim 14, wherein the stretching is performed in multiple steps and the stretching in a latter step is conducted at a higher temperature than in the preceding step.
Claim 17
Dependent Claim
17 words
The process of claim 1, wherein the stretching is performed in a speed range of 0.1-200 m/min.
Claim 18
Dependent Claim
25 words
The process of claim 2, wherein the polyolefin is an ultra-high-molecular-weight polyethylene and the stretching is performed at a draw ratio of at least 60-fold.
Claim 19
Dependent Claim
147 words
A process for the continuous production of a high-strength and high-modulus polyolefin material, which comprises: feeding a polyolefin in a powder form between a combination of endless belts disposed in an up-and-down opposing relation; compression-molding the polyolefin powder at a temperature lower than the melting point of the polyolefin powder by means of a pressing means while holding the polyolefin powder between the endless belts and conveying the same, said pressing means comprising pressing platens and corresponding sets of rollers, all accommodated within the respective endless belts, the rollers in each set being connected together, and said sets of rollers being arranged movably in an endless fashion between the respective platens and the endless belts associated therewith, wherein the temperature for the compression-molding step is maintained by heating means applied to at least one of the press platen; and rolling the resultant compression-molded polyolefin, followed by stretching.
Claim 20
Dependent Claim
147 words
A process for the continuous production of a high-strength and high-modulus polyolefin material, which comprises: feeding a polyolefin in a powder form between a combination of endless belts disposed in an up-and-down opposing relation; compression-molding the polyolefin powder at a temperature lower than the melting point of the polyolefin powder by means of a pressing means while holding the polyolefin powder between the endless belts and conveying the same, said pressing means comprising pressing platens and corresponding sets of rollers, all accommodated within the respective endless belts, the rollers in each set being connected together, and said sets of rollers being arranged movably in an endless fashion between the respective platens and the endless belts associated therewith, wherein the temperature for the compression-molding step is maintained by heating means applied to at least one of the press platen; and rolling the resultant compression-molded polyolefin, followed by stretching.
Claim 21
Dependent Claim
13 words
The process of claim 18, wherein the stretching is performed in multiple steps.
Claim 22
Dependent Claim
23 words
The process of claim 18, wherein the stretching in a later step is conducted at a higher temperature than in the preceding step.
Claim 23
Dependent Claim
29 words
The process of claim 18, wherein the temperature for the compression-molding step is maintained by a preheater provided in the proximity of at least one of the endless belts.
Claim 24
Dependent Claim
41 words
The process of claim 18, wherein the polyolefin is selected from the group consisting of homopolymers of α-olefins having 2-8 carbon atoms, copolymers of ethylene and α-olefins having 3-12 carbon atoms and copolymers of propylene and α-olefins having 2-12 carbon atoms.
Claim 25
Dependent Claim
19 words
The process of claim 22, wherein the polyolefin has a particle size distribution in a range of 10-2,000 μm.
Claim 26
Dependent Claim
24 words
The process of claim 18, wherein the endless belts have a belt thickness of 0.1-1.5 mm and a surface polished in a mirror-finished state.
Claim 27
Dependent Claim
15 words
The process of claim 24, wherein the rollers have an outer diameter of 5-30 mm.
Claim 28
Dependent Claim
32 words
The process of claim 18, wherein the endless belts have a running length of 30-400 cm and the press platens apply an average pressure of 0.1-20 kg/cm 2 to the endless belts.
Claim 29
Dependent Claim
36 words
The process of claim 24, wherein the compression-molding step is performed at 50° C. or higher where the polyolefin is a polyethylene polymer and at 90° C. or higher where the polyolefin is a polypropylene polymer.
Claim 30
Dependent Claim
18 words
The process of claim 18, wherein the endless belts are driven at a running speed of 30-400 cm/min.
Claim 31
Dependent Claim
20 words
The process of claim 18, wherein the pressing means is fed with a pressure from at least one hydraulic cylinder.
Claim 32
Dependent Claim
22 words
The process of claim 18, wherein the compression-molded polyolefin is rolled at a deformation ratio of 1.2-20 in terms of rolling efficiency.
Claim 33
Dependent Claim
33 words
The process of claim 30, wherein the rolling step is performed at a rolling temperature in a range of at least 20° C. but lower than the melting point of the polyolefin powder.
Claim 34
Dependent Claim
35 words
The process of claim 18, wherein the thus-rolled polyolefin is stretched by pulling the same in accordance with a method selected from the group consisting of hot-air stretching, cylinder stretching, roll stretching and hot-platen stretching.
Claim 35
Dependent Claim
17 words
The process of claim 32, wherein the stretching is performed in a temperature range of 20°-150° C.
Claim 36
Dependent Claim
31 words
The process of claim 33, wherein the stretching is performed in multiple steps and the stretching in a latter step is conducted at a higher temperature than in the preceding step.
Claim 37
Dependent Claim
17 words
The process of claim 18, wherein the stretching is performed in a speed range of 0.1-200 m/min.
Claim 38
Dependent Claim
25 words
The process of claim 22, wherein the polyolefin is an ultra-high-molecular-weight polyethylene and the stretching is performed at a draw ratio of at least 60-fold.
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) | 1995-02-24 | 1995-08-26 | 1996-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-24 | 1999-08-26 | 2000-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-24 | 2003-08-26 | 2004-02-25 | $7700.00 | Window Closed / Lapsed |