Magnetic composition

• US 6,774,171 B2
• Filed: 01/09/2003
• Issued: 08/10/2004
• Est. Priority Date: 01/25/2002
• Status: Expired due to Fees

• Current Assignee: Zephyros, Inc.
• Original Assignee: L&L Products Inc.
• Inventors: Apfel, Jeffrey R., Kassa, Abraham
• Primary Examiner(s): Pezzuto, Helen L.
• Application Number:
  US10/339,112
• Publication Number:
  US 20030144409A1
• Time in Patent Office: 579 Days
• Field of Search: 524/436, 524/515, 524/523
• US Class Current: 524/436
• CPC Class Codes: H01F 1/117 Flexible bodies

Abstract

A magnetic composition is disclosed. The composition includes a polymeric mixture and a magnetic material.

Claims

1. A magnetic composition, comprising:

a polymeric mixture, the polymeric mixture including;

i) ethyle-propylene rubber; and

ii) acrylic polymer;

an additive, which is selected from the group of a tackifier or a flexibility agent; and

a magnetic material, the magnetic material being at least partially formed of a ceramic;

wherein between about 7% and about 15% of the ethylene-propylene rubber is greater than about 55% by weight ethylene content and wherein the composition exhibits a peel strength at 90°

of greater than 45 grams per millimeter upon attachment to a metal component.

2. A magnetic composition as in claim 1 wherein the polymeric mixture includes a brominated elastomer that is derived from a copolymer of isobutylene and p-methylstyrene.

3. A magnetic composition as in claim 1 wherein the between about 7% and about 15% of the ethylene-propylene rubber is greater than about 70% by weight ethylene content.

4. A magnetic composition as in claim 1 wherein the polymeric mixture includes polyisobutylene and polymethylstyrene.

5. A magnetic composition as in claim 1 wherein the magnetic material is a ferrite.

6. A magnetic composition as in claim 1 further comprising a blowing agent, a blowing agent accelerator and a curing agent.

14. A magnetic composition as in claim 1 wherein the additive is a tackifier and the tackifier is hydrocarbon.

15. A magnetic composition as in claim 4 wherein the additive is a tackifier and the tackifier is a hydrocarbon.

16. A magnetic composition as in claim 1 further comprising an anti-corrosion agent.

17. A magnetic composition as in claim 16 wherein the anti-corrosion agent is a coumarone-indene resin.

20. A magnetic composition as in claim 1 further comprising a reinforcement material.

7. A magnetic composition, comprising:

a polymeric mixture, the polymeric mixture including;

i) ethylene-propylene rubber;

ii) acrylic copolymer;

iii) halogenated elastomer;

iv) polyisobutylene; and

v) polymethylstyrene;

tackifying agent, the tackifying agent being a hydrocarbon; and

a magnetic material, the magnetic material being at least partially formed of a ceramic and including a ferrite.

8. A magnetic composition as in claim 7 wherein the composition exhibits a peel strength at 90°

of greater than 45 grams per millimeter upon attachment to a metal component.

9. A magnetic composition as in claim 7 wherein the halogenated elastomer is a brominated elastomer that is derived from a copolymer of isobutylene an p-methylstyrene.

10. A magnetic composition as in claim 7 wherein between about 7% and about 15% of the ethylene-propylene rubber is greater than about 55% by weight ethylene content.

11. A magnetic composition as in claim 10 wherein the between about 7% and about 15% the ethylene-propylene rubber is greater than about 70% by weight ethylene content.

12. A magnetic composition as in claim 7 further comprising a blowing agent, a blowing agent accelerator and a curing agent.

18. A magnetic composition as in claim 7 further comprising an anti-corrosion agent.

19. A magnetic composition as in claim 18 wherein the anti-corrosion agent is a coumarone-indene resin.

21. A magnetic composition as in claim 7 further comprising a reinforcement material.

22. A magnetic composition as in claim 7 further comprising a paraffinic oil.

23. A magnetic composition as in claim 7 further comprising a paraffinic oil.

13. A magnetic composition, comprising:

a polymeric mixture, the polymeric mixture including;

i) ethylene-propylene rubber present in an amount between about 3% and about 10% by weight of the composition; and

ii) acrylic copolymer;

iii) halogenated elastomer;

iv) polybutene; and

v) a sub-mixture of elastomer and styrenic material

a tackifying agent, the tackifying agent being an aromatically modified C5 hydrocarbon tackifying resin;

a paraffinic oil;

a coumarone-indene resin;

a blowing agent, the blowing agent present in an amount between 0% and about 5% by weight of the composition;

a curing agent, the curing agent present in an amount between about 0.01% and about 3% by weight of the composition

reinforcement material, the reinforcement material being at least partially formed of polyamide fibers, the reinforcement material present in an amount between about 0.00% and about 3% by weight of the composition; and

a magnetic material present in an amount between about 10% and about 60% by weight of the composition, the magnetic material being at least partially formed of a ceramic the magnetic material at least partially selected from the group of barium ferrite, strontium ferrite or combinations thereof.