US4719027A
Expired / Lapsed
US
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Article having magnetic properties and production thereof
Assignee: Imperial Chemical Industries Ltd
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Filing: 1984-04-02
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Granted: 1988-01-12
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Expires: 2004-04-02
Abstract
Abstract PCT No. PCT/GB84/00114 Sec. 371 Date Jan. 30, 1986 Sec. 102(e) Date Jan. 30, 1986 PCT Filed Apr. 2, 1984 PCT Pub. No. WO84/02445 PCT Pub. Date Jul. 5, 1984.A shapeable composition comprising a homogeneous mixture of (a) at least one particulate ferrite material having magnetic properties, (b) at least one water-soluble or water-dispersible organic polymeric material, and (c) water, in the composition the components (a), (b) and (c) being present in a proportion by volume of the composition of respectively, 40 to 90%, 2 to 25%, and not more than 60%, a product produced therefrom, and a process for producing said product by removing water from the composition. The composition optionally contains additives capable of insolubilizing the organic polymeric material with respect to water.
Inventors
- 👤 James H. Raistrick
- 👤 Stephen J. Battersby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:37
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; H01F1/113
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
40 words
A shapeable composition capable of being shaped on rubber or plastics processing equipment and comprising a homogeneous mixture of (a) at least one particulate ferrite material having magnetic properties, (b) at least one water-soluble or water-dispersible organic polymeric material, and
Claim 2
Dependent Claim
40 words
A shapeable composition capable of being shaped on rubber or plastics processing equipment and comprising a homogeneous mixture of (a) at least one particulate ferrite material having magnetic properties, (b) at least one water-soluble or water-dispersible organic polymeric material, and
Claim 3
Dependent Claim
34 words
(c) water, in the composition the components (a), (b) and (c) being present in a proportion by volume of the composition of respectively, 40 to 90%, 2 to 25%, and not more than 30%.
Claim 4
Dependent Claim
34 words
(c) water, in the composition the components (a), (b) and (c) being present in a proportion by volume of the composition of respectively, 40 to 90%, 2 to 25%, and not more than 30%.
Claim 5
Dependent Claim
27 words
A shapeable composition as claimed claim 1 characterised in that the particulate ferrite material having magnetic properties has a medium particle size of greater than 0.3 micron.
Claim 6
Dependent Claim
24 words
A shapeable composition as claimed in claim 1 characterised in that the particulate ferrite material having magnetic properties comprises a plurality of particle sizes.
Claim 7
Dependent Claim
29 words
A shapeable composition as claimed in claim 1 characterised in that the composition comprises particulate ferrite material having magnetic properties in a proportion of 60% to 90% by volume.
Claim 8
Dependent Claim
108 words
A shapeable composition as claimed in claim 1 characterised in that the components of the composition are selected such that a test composition comprising 63% by volume of particulate ferrite material having magnetic properties, 7% by volume of water-soluble or water-dispersible organic polymeric material, and 30% by volume of water, when extruded in a capillary rheometer at an extrusion pressure up to a maximum of 500 atmospheres undergoes an increase of a least 25% in shear stress when a tenfold increase in the shear rate of the test composition is effected when the shear rates as measured are within the range of 0.1 to 5 second -1 .
Claim 9
Dependent Claim
25 words
A shapeable composition as claimed in claim 1 characterised in that the organic polymeric material comprises a hydrolysed polymer or copolymer of a vinyl ester.
Claim 10
Dependent Claim
19 words
A shapeable composition as claimed in claim 6 characterised in that the organic polymeric material comprises hydrolysed poly(vinyl acetate).
Claim 11
Dependent Claim
26 words
A shapeable composition as claimed in claim 1 characterised in that the organic polymeric material is present in a proportion of 7% to 20% by volume.
Claim 12
Dependent Claim
21 words
A shapeable composition as claimed in claim 8 characterised in that the composition contains 5% to 20% by volume of water.
Claim 13
Dependent Claim
32 words
A shapeable composition as claimed in claim 1 characterised in that the composition comprises an additive capable of reacting with the organic polymeric material to insolubilise the material with respect to water.
Claim 14
Dependent Claim
17 words
A shapeable composition as claimed in claim 10 characterised in that the additive is aluminium hydroxy chloride.
Claim 15
Dependent Claim
32 words
A shapeable composition as claimed in claim 10 characterised in that the additive is present in a proportion of 5% to 100% by volume of the organic polymeric material in the composition.
Claim 16
Dependent Claim
36 words
A shapeable composition as claimed in claim 1 characterised in that the composition comprises an additive capable of effecting coupling between the organic polymeric material and the surface of the particulate ferrite material having magnetic properties.
Claim 17
Dependent Claim
30 words
A shapeable composition as claimed in claim 13 characterised in that the additive capable of insolubilising the organic polymeric material is the same as the additive capable of effecting coupling.
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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) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |