Magnetic thermoplastic tubing
US6359051B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1999 |
| Grant date | Mar 19, 2002 |
| Priority date | — |
| Expiry date | Dec 14, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K3/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention discloses a polymeric magnet composition that is particularly useful for extrusion into thermoplastic magnetic tubing, said polymeric magnet composition being comprised of (1) from 2 to 8 parts by weight of a rubbery polymer which is comprised of repeat units which are comprised of (a) butyl acrylate, (b) at least one member selected from the group consisting of methyl methacrylate, ethyl methacrylate, methyl acrylate and ethyl acrylate, (c) acrylonitrile, (d) styrene, (e) a surfactant selected from the group consisting of sulfonates and sulfate derivatives, (f) a dispersant selected from the group consisting of aromatic formaldehyde condensation products and polycarboxylates and (g) a crosslinking agent; (2) from 2 to 8 parts by weight of a styrene-butadiene resin; (3) from 80 to 90 parts by weight of a magnetic powder; and (4) from 1 to 8 parts by weight of an internal lubricant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.