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.
  
== Other Properties ==
+
==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"
 
|-
 
|-
! scope="row"| Molecular Weight
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! scope="row"| Tg
| Tg =50.8 C
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| 50.8 C
 
|-
 
|-
 
! scope="row"| Refractive Index
 
! scope="row"| Refractive Index
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|}
 
|}
  
== Additional Information ==
+
==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
+
* 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]
  
== Sources Checked for Data in Record ==
+
* 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 12:38, 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)

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