Laropal K-80
Description
[BASF] A trademark for a polycyclohexanone resin introduced in 1979 as a replacement for Resin N Ketone Resin N. Laropal K-80 is prepared by the polycondensation of cyclohexanone in a continuous process. Polycyclohexanones resemble dammar in that they are soluble in (oil) turpentine and form a glossy, colorless coating. However, they are harder and exhibit less wrinkling, blooming, and yellowing than natural resins. Because polycyclohexanone coatings are hard, however, many formulations add a plasticizer for flexibility and many of the plasticizers tend to yellow. Additionally the polycyclohexanones oxidize, become brittle, and less soluble with age. They have been used for retouching and occasionally for picture varnishes.
Other Properties
Soluble in petroleum hydrocarbons, turpentine, isopropanol. Insoluble in water and methanol. Partially soluble in ethanol.
| Molecular Weight | Tg =50.8 C |
|---|---|
| Refractive Index | 1.529 |
Additional Information
BASF: for Technical Info and MSDS R. Cox, "Ketone Resin Varnishes" AIC Painting Conservation Catalog, Varnishes and Surface Coatings, p. 75, 1998
Authority
- Conservation Materials Ltd., Conservation Materials Ltd., Catalog
- Teri Hensick, Teri Hensick, contributed information, 1998
- Website address 1, Website address 1 Comment: www.hants.org.uk/museums/ofr/cmeth_t.html