Curable film-forming composition exhibiting improved scratch resistance
US6916368B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2003 |
| Grant date | Jul 12, 2005 |
| Priority date | — |
| Expiry date | Jul 23, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/269
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A curable film-forming composition is provided that on curing produces a coating, comprising in a medium (i) 10 to 90 percent by weight based on the total weight of resin solids in the film-forming composition of a crosslinking agent; (ii) 10 to 90 percent by weight based on the total weight of resin solids in the film-forming composition of a polymer containing a plurality of functional groups reactive with the crosslinking agent; and (iii) 20 to 85 percent by volume based on the total volume of the film-forming composition of particles having a mean particle size less than 100 nm. The particles further have an index of refraction sufficiently similar to that of the polymer of (ii) to minimize haze, and have an affinity for the medium sufficient to keep the particles suspended therein. The affinity of the particles for the medium is greater than the affinity of the particles for each other, thereby preventing agglomeration of the particles within the medium. The film-forming compositions exhibit improved scratch (mar) resistance compared to compositions of the prior art, as well as improved sag resistance when compared to similar coating compositions prepared without the particles…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.