abietic acid


abietic acid
/ab"ee et"ik, ab'-/, Chem.
a yellow, crystalline, water-insoluble acid, C20H30O2, obtained from the resin of a species of pine: used chiefly in driers, varnishes, and soaps. Also called sylvic acid.
[1860-65; < L abiet- (s. of abies) fir + -IC]

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      the most abundant of several closely related organic acids that constitute most of rosin, the solid portion of the oleoresin of coniferous trees. Commercial abietic acid is usually a glassy or partly crystalline, yellowish solid that melts at temperatures as low as 85° C (185° F). It belongs to the diterpene group of organic compounds (compounds derived from four isoprene units).

      Rosin has been used for centuries for caulking ships. It is also rubbed on the bows of musical instruments to make them less slippery. In modern times methods have been developed for improving the properties of the rosin acids, which are soft, tacky, and low-melting and subject to rapid deterioration by oxidation in air. Stability is greatly increased by heat treatment.

      Rosin acids are converted into ester gum by reaction with controlled amounts of glycerol or other polyhydric alcohols. Ester gum has drying properties and is used in paints, varnishes, and lacquers.

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Universalium. 2010.

Look at other dictionaries:

  • Abietic acid — Chembox new Name = Abietic acid [cite web url=http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=10569 title=ABIETIC ACID PubChem Public Chemical Database publisher=pubchem.ncbi.nlm.nih.gov accessdate=2008 05 16 last= first=] ImageFile =… …   Wikipedia

  • abietic acid — abieto rūgštis statusas T sritis chemija formulė C₁₉H₂₉COOH atitikmenys: angl. abietic acid rus. абиетиновая кислота …   Chemijos terminų aiškinamasis žodynas

  • abietic acid — |abē|ed.ik noun Etymology: International Scientific Vocabulary abiet , (from Latin abiet , abies silver fir) + ic : a colorless crystalline tricyclic acid C19H29COOH with two double bonds that constitutes the major component of rosin, that is… …   Useful english dictionary

  • abietic acid — /æbiˌɛtɪk ˈæsəd/ (say abee.etik asuhd) noun a yellow crystalline acid, C19H29COOH, derived from the resin of a species of pine, used in dryers, varnishes, and soaps; sylvic acid. {stem of Latin abiēs fir + ic + acid1} …   Australian English dictionary

  • abietic acid — noun A yellowish resin acid isolated from rosin and used in varnishes etc …   Wiktionary

  • Abietic — Ab i*et ic, a. Of or pertaining to the fir tree or its products; as, abietic acid, called also sylvic acid. Watts. [1913 Webster] …   The Collaborative International Dictionary of English

  • abietic — abietic, a. Chem. (æbɪˈɛtɪk) [f. L. abiet em fir tree + ic.] Of or pertaining to fir. abietic acid, a monobasic acid, C20H30O2, which is the essential constituent of resin. Reader No. 86. 239/3 …   Useful english dictionary

  • abietic — adjective a) Of, pertaining to, or derived from fir trees b) Of or pertaining to abietic acid or its derivatives …   Wiktionary

  • Resin acid — Resin acids are protectants and wood preservatives that are produced by parenchymatous epithelial cells that surround the resin ducts in trees from temperate coniferous forests. The resin acids are formed when two and three carbon molecules… …   Wikipedia

  • neoabietic acid — |nē(ˌ)ō+... noun Etymology: neoabietic from ne + abietic (in abietic acid) : a crystalline resin acid C19H29COOH that is isomeric with abietic acid and is found especially in oleoresins from pine trees …   Useful english dictionary


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