Method of preparing homogeneous thermosetting powder paint compositions
US4042560A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1975 |
| Grant date | Aug 16, 1977 |
| Priority date | — |
| Expiry date | Nov 5, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S524/904
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of preparing a homogeneous thermosetting powder paint composition which cures to form a coating exhibiting outstanding exterior durability, adhesion, impact strength and, in particular, color match. The method comprises: introducing a liquid paint composition including at least a cross-linkable copolymer and a uniformly dispersed pigment into an evaporating zone adapted to heat said liquid paint so as to evaporate the inert solvent contained therein, passing the liquid paint into a separating zone; causing said solvent vapor to be removed; removing the non-volatile components of said paint in a molten state; cooling said non-volatile components; granulating said non-volatile components to form particles; blending a cross-linking agent for said copolymer with said powder; mixing said blend at a temperature greater than the melting point of said powder and said cross-linking agent but below the point at which cross-linking occurs so to form a molten mass having cross-linking agent uniformly dispersed therein; cooling said molten mass to form a solid material; and pulverizing to form a powder paint.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.