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US4708976A
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Polymer compositions containing magnetically susceptible filler
Assignee: Imperial Chemical Industries Ltd
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Filing: 1986-04-23
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Granted: 1987-11-24
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Expires: 2006-04-23
Abstract
Abstract The invention provides a method of influencing the orientation of the polymer molecules in a melt of molecularly orientable polymer by subjecting a composition containing the polymer and a megnetically susceptible filler to a magnetic field of at least 0.005 Tesla prior to or during the formation of a shaped article from the melt. Compositions for use in the invention comprise a thermoplastic polymer and at least 0.05% by weight of a magnetically susceptible filler, particularly a ferrite. The invention is most easily applied to thermotropic polymer compositions.
Inventors
- 👤 Timothy G. Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:56
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/24; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/58; B29C70/62; B29C71/00; B29C71/0072; C08K3/01; C08K3/013; C08K3/20; C08K3/22; B29K; B29K2105/00; B29K2105/0079
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
A method of influencing the orientation of the polymer molecules in a thermotropic melt comprising forming a molten mixture of a polymer capable of forming a thermotropic melt which exhibits anisotropic (liquid crystalline) properties and 0.05% to 5.0% by weight of the mixture of a finely divided magnetically susceptible filler and passing the mixture through a magnetic field prior to or during the formation of a shaped article from the melt.
Claim 2
Independent Claim
71 words
A method of influencing the orientation of the polymer molecules in a thermotropic melt comprising forming a molten mixture of a polymer capable of forming a thermotropic melt which exhibits anisotropic (liquid crystalline) properties and 0.05% to 5.0% by weight of the mixture of a finely divided magnetically susceptible filler and passing the mixture through a magnetic field prior to or during the formation of a shaped article from the melt.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein the field strength is at least 0.005 Tesla.
Claim 4
Independent Claim
36 words
A method according to either of claims 1 or 2 in which the field is applied to a shaped article formed from the mixture over the period during which the article commences solidification from the melt.
Claim 5
Dependent Claim
18 words
A method according to claim 1 or 2 in which the magnetically susceptible filler is a metal ferrite.
Claim 6
Dependent Claim
43 words
A composition for uses in the method of any one of claims 1 or 2 comprising a thermoplastic polymer capable of forming a thermotropic melt which exhibits anisotropic (liquid crystalline) properties and from 0.05% to 5.0% by weight of a magnetically susceptible filler.
Claim 7
Dependent Claim
23 words
A composition according to claim 5 in which the magnetically susceptible filler is selected from barium, calcium, strontium, lead, zinc and magnesium ferrites.
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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) | 1990-11-23 | 1991-05-25 | 1991-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-23 | 1995-05-25 | 1995-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-23 | 1999-05-25 | 1999-11-24 | $7700.00 | Window Closed / Lapsed |