Colored powder coating compositions
US5319001A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1991 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Jul 25, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2998
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A coloured powder coating composition consists of solid particles, each of which comprises a solid polymeric binder system and at least a majority of which contain at least one colouring agent. The composition is a mixture of particles of at least two different colours. The size of the particles is sufficiently low that when the powder coating is applied to a substrate and heated to form a continuous coating the differences in colour in the cured powder coating arising from the different coloured particles cannot be discerned by the human eye. The size of the particles is preferably below 10 microns in the largest dimension. The particles are preferably agglomerated into composite particles of mean particle size 15 to 75 microns for application by electrostatic spray.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.