US4824619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing polyethylene drawn filaments and drawn films
Assignee: Toyobo Co Ltd
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Filing: 1987-12-21
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Granted: 1989-04-25
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Expires: 2007-12-21
Abstract
Abstract A process for producing polyethylene drawn filaments and drawn films which comprises molding under pressure a mixture of 51 to 90 parts by weight of polyethylene powder having a weight average molecular weight of at least 4×10 5 and having no history of being molten or dissolved after polymerization, and 49 to 10 parts by weight of a solvent at a temperature lower than the melting point of the mixture, and then hot-stretching the molded product.
Inventors
- 👤 Fujio Okada
- 👤 Toshihiko Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:25
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C55/00; B29C55/005; D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; B29K; B29K2023/00; B29K2023/04; B29K2023/06; C08J2323/00; C08J2323/02; C08J2323/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
75 words
A process for producing polyethylene drawn filaments and drawn films which comprises molding under pressure a mixture of 51-90 parts by weight of polyethylene powder having a weight average molecular weight of at least 4×10 5 and having no history of being molten or dissolved after polymerization, and 49 to 10 parts by weight of a solvent at a temperature lower than the endothermic peak temperature of the mixture, and then hot-stretching the molded product.
Claim 2
Dependent Claim
75 words
A process for producing polyethylene drawn filaments and drawn films which comprises molding under pressure a mixture of 51-90 parts by weight of polyethylene powder having a weight average molecular weight of at least 4×10 5 and having no history of being molten or dissolved after polymerization, and 49 to 10 parts by weight of a solvent at a temperature lower than the endothermic peak temperature of the mixture, and then hot-stretching the molded product.
Claim 3
Dependent Claim
85 words
A process according to claim 1 wherein the polyethylene powder having no history of being melted or dissolved after polymerization has a melting point of not lower than 130° C. and has a maximum draw ratio of at least 40 which is determined by the following measuring procedure: polyethylene powder is compression molded by a plate press at 130° C. under pressure of 400kg/cm 2 to form a sheet which is stretched in an air bath at 130° C. to measure its maximum draw ratio.
Claim 4
Dependent Claim
28 words
A process according to claim 1, wherein the molding is carried out by heating the mixture fed to the die to swell it and extruding from the die.
Claim 5
Dependent Claim
38 words
A process according to claim 3, wherein a die hole does not increase in sectional area in the extrusion direction, and the outlet sectional area is in the range of from 6 to 80% of the inlet one.
Claim 6
Dependent Claim
16 words
A process according to claim 1 wherein the molding is carried out by a roller press.
Claim 7
Dependent Claim
14 words
A process according to claim 2 wherein the draw ratio is at least 10.
Claim 8
Dependent Claim
28 words
A process according to claim 2, wherein the molding is carried out by heating the mixture fed to the die to swell it and extruding from the die.
Claim 9
Dependent Claim
16 words
A process according to claim 2, wherein the molding is carried out by a roller press.
Claim 10
Dependent Claim
14 words
A process according to claim 2, wherein the draw ratio is at least 10.
Claim 11
Dependent Claim
22 words
A process according to claim 1, wherein the molding temperature is 3°-20° C. lower than the endothermic peak temperature of the mixture.
Claim 12
Dependent Claim
22 words
A process according to claim 2, wherein the molding temperature is 3°-20° C. lower than the endothermic peak temperature of the mixture.
Claim 13
Dependent Claim
14 words
A process according to claim 1, wherein the molding temperature is between 100°-124° C.
Claim 14
Dependent Claim
14 words
A process according to claim 2, wherein the molding temperature is between 100°-124° C.
Claim 15
Dependent Claim
20 words
A process according to claim 1, wherein the molded product has a tensile strength of at least about 1.3 GPa.
Claim 16
Dependent Claim
20 words
A process according to claim 2, wherein the molded product has a tensile strength of at least about 1.3 GPa.
Claim 17
Dependent Claim
15 words
A process according to claim 1, wherein the tensile modulus is at least 51 GPa.
Claim 18
Dependent Claim
15 words
A process according to claim 2, wherein the tensile modulus is at least 51 GPa.
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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) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |