View source for Laropal K-80

== Description ==

[BASF] A trademark for a [[polycyclohexanone]] resin introduced in 1979 as a replacement for [[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 [[turpentine (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, 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.

{| class="wikitable"
|-
! scope="row"| Molecular Weight
| Tg =50.8 C
|-
! scope="row"| Refractive Index
| 1.529
|}

== Additional Information ==

° BASF: [http://www.basf.de/en/produkte/farbmittel/farben/pigmente/coatings/deco/harze/?sortiment=Laropal&amp;amp;db_id=19&amp;amp;id=qOiq14Vn4bsf2t- for Technical Info and MSDS]° R. Cox, "Ketone Resin Varnishes" AIC Painting Conservation Catalog, Varnishes and Surface Coatings, p. 75, 1998

== Sources Checked for Data in Record ==

* Conservation Materials Ltd., Catalog

* Teri Hensick, contributed information, 1998

* Comment: www.hants.org.uk/museums/ofr/cmeth_t.html (Note: this website is no longer active)


[[Category:Materials database]]