Co-extrustion of multi-component insecticidal pet collars
US4803956A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1984 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Oct 15, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2307/764
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Co-extruded insecticidal pet collars contain one or more active insecticidal components in a desired relationship to the skin of the animal. The outside layer (away from the skin) contains carbamate, organo-phosphate chlorinated hydrocarbon or other insecticide that is irritating to the skin, or a cholinesterase inhibitor. The inside layer acts as a barrier to the insecticide. The layers of a multi-layered collar which is prepared by extrusion may also contain different insecticidal systems. A co-extruded collar is prepared by preparing two blends which have varying concentrations of active and/or inert ingredients, depending on the end product which is desired. Each of the blends is fed into an extruder wherein the polyvinyl chloride is fused. The melt blend from extruder B is then transferred to the die of extruder A where it becomes an integral part of the extruded strip from extruder A.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.