Coated abrasives with rapidly curable adhesives and controllable curvature
US4642126A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1985 |
| Grant date | Feb 10, 1987 |
| Priority date | — |
| Expiry date | Feb 11, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D4/06
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Previous coated abrasives with adhesives suited to rapid, UV light initiated cure often had intractable curl problems. Therefore, such coated abrasives have been unsuited to precision finishing of workpieces with strict flatness or other curvature requirements, such as read-write heads for magnetic recorders or computer memories. This invention provides coated abrasives, having adhesives with cure initiated by UV light, which are suited to curvature control by the methods used conventionally for magnetic recording media. The preferred adhesive formulations include reaction products of 2-hydroxyethyl acrylate with polyol polyester oligomers capped with isocyanate end groups, alkoxylated diacrylated monomers, and N-vinyl pyrrolidone and other monomers with only one polymerizable unsaturated double bond per molecule, and sometimes also include nonpolymerizable thermoplastic polymers. The adhesives, with abrasives grain dispersed therein, are milled in special mills combining the actions of small milling media with large scale high speed agitation to reduce their viscosity to a workable level for gravure roll coating. The dispersion is then coated on plastic film backings and cured wit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.