Composition and method for enhancing the surface conductivity of thermoplastic surfaces
US5219493A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1991 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Jun 12, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D2201/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a surface treatment composition and a method of using the composition to provide the treated surface with a suitable surface conductivity for electrostatic painting of the surface. The surface treatment composition preferably comprises a mixture of: (a) a substituted or unsubstituted aromatic polycarboxylic acid, anhydride or salt thereof, and (b) a quaternary ammonium salt or (b') an ethoxylated tertiary fatty amine, in a compatible vehicle, said composition having a pH of below about 4.5, said polycarboxylic acid and said quaternary ammonium salt or ethoxylated fatty amine each being present in said composition in an amount effective to impart to said thermoplastic surface a resistivity value of between about 10.sup.8 ohms/cm.sup.2 and about 10.sup.12 ohms/cm.sup.2, or a 90% electrostatic charge decay time of less than five seconds, or both.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.