Patent US4876049A successfully refreshed from Google Patents.
US4876049A
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Method for preparing molded articles of ultra-high molecular weight polyethylene
Assignee: Eneos Corp
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Filing: 1986-11-19
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Granted: 1989-10-24
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Expires: 2006-11-19
Abstract
Abstract The present invention provides a method for preparing a molded article of an ultra-high molecular weight polyethylene which is characterized by compression-molding, or heating and pressurizing a porous sheet of said ultra-high molecular weight polyethylene. The porous sheet may be superposed with a substrate, and may be wrapped around a deformable member of a mold and densified by deformation of said member.
Inventors
- 👤 Takeo Aoyama
- 👤 Teruo Imai
- 👤 Junichi Hattori
- 👤 Mikio Uehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:52
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/10; B29C43/12; B29C67/00; B29C67/24; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0658; B29K2023/0683; B29K2105/00; B29K2105/25; B29K2105/253; B29K2105/256; B29K2623/00; B29K2623/04; B29K2623/06; B29K2623/0658; B29K2623/0683; B29K2995/00; B29K2995/0037; B29K2995/0088; B29L; B29L2023/00; B29L2023/003; B29L2023/004; B29L2023/22; B29L2031/00; B29L2031/24; Y; Y10; Y10S; Y10S425/00; Y10S425/112; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
67 words
A method for preparing a molded hollow article of an ultra-high molecular weight polyethylene comprising the steps of providing a mold having a deformable member; positioning a porous sheet of said ultra-high molecular weight polyethylene about said deformable member; applying heat and deforming said deformable member with sufficient pressure to thereby cause said sheet to adhere closely to said mold, whereby said sheet is melted and densified.
Claim 2
Independent Claim
67 words
A method for preparing a molded hollow article of an ultra-high molecular weight polyethylene comprising the steps of providing a mold having a deformable member; positioning a porous sheet of said ultra-high molecular weight polyethylene about said deformable member; applying heat and deforming said deformable member with sufficient pressure to thereby cause said sheet to adhere closely to said mold, whereby said sheet is melted and densified.
Claim 3
Dependent Claim
28 words
The method according to claim 1 wherein said ultra-high molecular weight polyethylene has an intrinsic viscosity of 8 dl/g or more in a decalin solution at 135° C.
Claim 4
Dependent Claim
44 words
The method according to claim 1 wherein said porous sheet is a sheet preformed by feeding an ultra-high molecular weight polyethylene powder between at least two heated rollers rating in mutually reverse directions, wherein said powder is melted at a temperature above 140° C.
Claim 5
Dependent Claim
45 words
The method according to claim 1 wherein said sheet is superposed with a substrate comprising at least one material selected from the group consisting of thermoplastic resin, thermosetting resin, rubber, metallic foil, metallic plate, wire mesh, cloth and paper and wherein a laminate is formed.
Claim 6
Dependent Claim
25 words
The method according to claim 1 wherein said polyethylene has an intrinsic viscosity of at least 8 dl/g in a decalin solution at 135° C.
Claim 7
Dependent Claim
28 words
The method according to claim 1 wherein said porous sheet is prepared by compounding solvent-suluba components with ultra-high molecular weight polyethylene and thereafter removing solvent-soluble components by extraction.
Claim 8
Dependent Claim
29 words
The method according to claim 1 wherein said sheet is prepared by feeding ultra-high molecular weight polyethylene powder between at least two heated rolls rotating in mutually reverse directions.
Claim 9
Dependent Claim
20 words
The method according to claim 7 wherein said sheet is prepared at a temperature of at least about 140° C.
Claim 10
Dependent Claim
37 words
The method according to claim 4 wherein said thermoplastic resin is selected from the group consisting of polyolefin resins, copolymers of alpha-olefins with other monomers, polystyrene resins, polyacrylic resins, polyvinylchoride resins, polyvinylidene chloride resins and polyamide resins.
Claim 11
Dependent Claim
34 words
The method according to claim 4 wherein said thermosatins resins are selected from the group consisting of epoxy resins, phenol resins, urethane resins, urea resins, melamine resins, diallyl phthalate resins and unsaturated polyester resins.
Claim 12
Dependent Claim
19 words
The method according to claim 1 wherein the molding temperature is maintained between about 130° C. and 250° C.
Claim 13
Dependent Claim
19 words
The method according to claim 1 wherein the molding temperature is maintained between about 140° C. and 300° C.
Claim 14
Dependent Claim
20 words
The method according to claim 1 wherein the deformation or molding pressure is maintained above about 0.1 kg/cm 2 .
Claim 15
Dependent Claim
20 words
The method according to claim 1 wherein the deformation or molding pressure is maintained above about 1 kg/cm 2 .
Claim 16
Dependent Claim
29 words
The method according to claim 1 wherein said deformable member is deformed by applying pressure to a surface of the deformable member opposite a surface carrying said porous sheet.
References Cited (Backward Citations)
GB1044502A
Cited
GB1044503A
Cited
US3566449A
Cited
US3891736A
Cited
US4336221A
Cited
US4265851A
Cited
US4187621A
Cited
US4353855A
Cited
US4350485A
Cited
US4443401A
Cited
US4538787A
Cited
US4535100A
Cited
US4639343A
Cited
US4793882A
Cited
JPH0646215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |