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Resin acids occur in nature as tacky, yellowish gums consisting of several compounds. They are water-insoluble. A common resin acid is abietic acid. [1] Resin acids are used to produce soaps for diverse applications, but their use is being displaced increasingly by synthetic acids such as 2-ethylhexanoic acid or petroleum-derived naphthenic acids.
Rosin (/ ˈ r ɒ z ɪ n /), also known as colophony or Greek pitch (Latin: pix graeca), is a resinous material obtained from pine trees and other plants, mostly conifers.The primary components of rosin are diterpenoids, i.e., C 20 carboxylic acids.
Related to the terpenes, resin acid is oxidized terpenes. Resin acids dissolve in alkalis to form resin soaps, from which the resin acids are regenerated upon treatment with acids. Examples of resin acids are abietic acid (sylvic acid), C 20 H 30 O 2, plicatic acid contained in cedar, and pimaric acid, C 20 H 30 O 2, a constituent of galipot ...
A Dictionary of science, literature, and art : comprising the history, description, and scientific principles of every branch of human knowledge; with the derivation and definition of all the terms in general use New York : Harper & brothers 1844; A dictionary of science, literature & art. London : Longman, Green, and co., 1875.
The artist applies a ground that will resist acid. Ground is applied by dissolving powdered resin in spirits, by applying the powder directly to the surface of the plate, or by using a liquid acrylic resist. In all forms of etching the acid resist is commonly referred to as "the ground." An aquatint box is used to apply resin powder.
Pimaric acid is a carboxylic acid that is classified as a resin acid. It is a major component of the rosin obtained from pine trees. [1] [2] When heated above 100 °C, pimaric acid converts to abietic acid, which it usually accompanies in mixtures like rosin. It is soluble in alcohols, acetone, and ethers. The compound is colorless, but almost ...
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Acid anhydride is added to the resulting mixture to build the molecular weight of the resin into roughly the same product as with the fatty acid process. However, the alcoholysis process produces a more randomly oriented structure. To remove the water produced as a by-product and to increase the reaction rate, surplus phthalic anhydride is added.