Air conditioning hose
US6376036B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1998 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | Mar 26, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31757
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention relates to a composite flexible hose, preferably for use in automotive air conditioning systems, with improved thermal resistance. The hose consists of an innermost core layer, a friction rubber layer, an intermediate reinforcement layer, and an external cover layer. The innermost layer is a non-plasticized polyamide mixed with a minor portion of polyolefin corresponding to the main rubber constituent of the friction coat layer. The friction coating is formed of a rubber composite of two EPDM rubbers at a weight ratio of 50/50 and 75 parts by weight of carbon black. The intermediate fibrous reinforcement layer is formed of aramid. The external layer is an acrylate rubber comprising a blend of two ethylene acrylates at a weight ratio of 50/50 and 80 parts by weight of carbon black.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.