US5205974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of continuous objects of plastics
Assignee: DSM IP Assets BV
•
Filing: 1991-11-20
•
Granted: 1993-04-27
•
Expires: 2011-11-20
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
2026-11-09 14:50
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: 10
Claim 1
Independent Claim
135 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 cooled, the cooled article being heated to and 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 behavior, and rapidly cooling the resulting stretched article, while stressed, to a continuous object.
Claim 2
Dependent Claim
135 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 cooled, the cooled article being heated to and 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 behavior, 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 0.4 and 10 s -1 .
Claim 8
Dependent Claim
17 words
Process according to claim 1, wherein the stretching rate lies between 0.5 and 5 s -1 .
Claim 9
Dependent Claim
73 words
Process for the manufacture of continuous objects of polyethylene that possess shish-kebab morphology wherein a polyethylene having a weight average molecular weight between 400,000 and 1,500,000 g/mol, is in the melt state and then converted to a continuous object, said object being cooled, the cooled object being heated to and stretched at a temperature between 130° C. and 160° C. at a stretching rate of 0.1-10 s -1 to form the shish-kebab morphology.
Claim 10
Dependent Claim
73 words
Process for the manufacture of continuous objects of polyethylene that possess shish-kebab morphology wherein a polyethylene having a weight average molecular weight between 400,000 and 1,500,000 g/mol, is in the melt state and then converted to a continuous object, said object being cooled, the cooled object being heated to and stretched at a temperature between 130° C. and 160° C. at a stretching rate of 0.1-10 s -1 to form the shish-kebab morphology.
References Cited (Backward Citations)
US4948545A
Cited
EP1513343A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-26 | 1996-10-26 | 1997-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-26 | 2000-10-26 | 2001-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-26 | 2004-10-26 | 2005-04-27 | $7700.00 | Window Closed / Lapsed |