Difference between revisions of "Laropal K-80"
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[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. | [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. | ||
| − | == | + | ==Physical and Chemical Properties== |
Soluble in petroleum hydrocarbons, turpentine, isopropanol. Insoluble in water and methanol. Partially soluble in ethanol. | Soluble in petroleum hydrocarbons, turpentine, isopropanol. Insoluble in water and methanol. Partially soluble in ethanol. | ||
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{| class="wikitable" | {| class="wikitable" | ||
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| − | ! scope="row"| | + | ! scope="row"| Tg |
| − | | | + | | 50.8 C |
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
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| − | == | + | ==Resources and Citations== |
| − | + | * BASF: [http://www.basf.de/en/produkte/farbmittel/farben/pigmente/coatings/deco/harze/?sortiment=Laropal&db_id=19&id=qOiq14Vn4bsf2t- for Technical Info and MSDS] | |
| − | + | * R. Cox, "Ketone Resin Varnishes" AIC Painting Conservation Catalog, Varnishes and Surface Coatings, p. 75, 1998 | |
| − | |||
| − | |||
* Conservation Materials Ltd., Catalog | * Conservation Materials Ltd., Catalog | ||
Latest revision as of 13:38, 29 September 2022
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 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.
Physical and Chemical Properties
Soluble in petroleum hydrocarbons, turpentine, isopropanol. Insoluble in water and methanol. Partially soluble in ethanol.
| Tg | 50.8 C |
|---|---|
| Refractive Index | 1.529 |
Resources and Citations
- R. Cox, "Ketone Resin Varnishes" AIC Painting Conservation Catalog, Varnishes and Surface Coatings, p. 75, 1998
- 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)