US5080849A
Expired / Lapsed
US
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Process for the preparation of continuous objects of plastic
Assignee: DSM IP Assets BV
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Filing: 1989-06-02
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Granted: 1992-01-14
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Expires: 2009-06-02
Abstract
Abstract A process for the manufacture of filaments, tapes and films that possess a shish kebab morphology. This is effected in that for instance UHMW PE after extrusion is stretched at a temperature between the melting temperature (Tm) and a critical temperature (Tc) and subsequently cooled in stressed condition. The stretching rate is between 0.1 and 10 sec. -1 .
Inventors
- 👤 Cornelis W. M. Bastiaansen
- 👤 Henricus E. H. Meijer
- 👤 Zaheer Bashir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:12
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/30; C; C08; C08J; C08J5/00; C08J5/18; 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: 8
Claim 1
Independent Claim
127 words
Process for the manufacture of continuous objects of plastic that possess a shish kebab morphology, wherein a non-oriented plastic with a relatively high weight average molecular weight (Mw) and containing chain molecules with a particular rate of relaxation is in a melt state and then converted to a continuous article, said article being stretched at a temperature lying between the melting temperature of the non-orientated plastic (Tm) and a certain higher temperature (Tc), in that the rate of stretching lies between a lower rate (Ve) which is higher than the rate of relaxation of the chain molecules, and a higher rate which is not so high that the melt begins to show elastic behaviour, and rapidly cooling the resulting stretched article, while stressed, to a continuous object.
Claim 2
Dependent Claim
127 words
Process for the manufacture of continuous objects of plastic that possess a shish kebab morphology, wherein a non-oriented plastic with a relatively high weight average molecular weight (Mw) and containing chain molecules with a particular rate of relaxation is in a melt state and then converted to a continuous article, said article being stretched at a temperature lying between the melting temperature of the non-orientated plastic (Tm) and a certain higher temperature (Tc), in that the rate of stretching lies between a lower rate (Ve) which is higher than the rate of relaxation of the chain molecules, and a higher rate which is not so high that the melt begins to show elastic behaviour, and rapidly cooling the resulting stretched article, while stressed, to a continuous object.
Claim 3
Dependent Claim
18 words
Process according to claim 1, wherein the plastic is polyethylene with an Mw between 400,000 and 1,500,000 g/mol.
Claim 4
Dependent Claim
18 words
Process according to claim 1, wherein the plastic is polyethylene with an Mw between 500,000 and 1,200,000 g/mol.
Claim 5
Dependent Claim
18 words
Process according to claim 1, wherein the plastic is polyethylene with an Mw between 800,000 and 1,000,000 g/mol.
Claim 6
Dependent Claim
19 words
Process according to claim 1, wherein the stretching takes place at a temperature between 130° C. and 160° C.
Claim 7
Dependent Claim
17 words
Process according to claim 1, wherein the stretching rate lies between 0.1 and 10 sec. -1 .
Claim 8
Dependent Claim
17 words
Process according to claim 1, wherein the stretching rate lies between 0.5 and 5 sec. -1 .
References Cited (Backward Citations)
EP0151343A1
Cited
US4948545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |