rosin


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rosin

or

colophony,

hard, brittle, translucent resinresin,
any of a class of amorphous solids or semisolids. Resins are found in nature and are chiefly of vegetable origin. They are typically light yellow to dark brown in color; tasteless; odorless or faintly aromatic; translucent or transparent; brittle, fracturing like glass;
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, obtained as a solid residue from crude turpentineturpentine,
yellow to brown semifluid oleoresin exuded from the sapwood of pines, firs, and other conifers. It is made up of two principal components, an essential oil and a type of resin that is called rosin.
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. Usually pale yellow or amber, its color may vary from brownish-black to transparent depending on the nature of the source of the crude turpentine. Rosin has no taste but often has a faint odor of pine. It is soluble in alcohol, ether, turpentine, and several other organic solvents, and in solutions of various metal hydroxides. Rosin is not a pure substance but a mixture of several compounds, chiefly abietic acid. It is used in making cements, varnishes, paints, sealing wax, adhesives, and some soaps; for treating violin bows; as a dressing for machine belting; as a sizing material for paper; in the preparation of certain metals for soldering; and, in pharmacy, in some ointments, plasters, and similar preparations. Athletes commonly rub it (in the form of dust) upon their hands or the soles of their shoes to prevent slipping.

Rosin

 

(or colophony), a brittle, vitreous substance varying in color from light yellow to dark red; one of the resinous substances found in pine trees and obtained in the form of residue following distillation of the volatile part from these substances. Rosin has a density of 1.07-1.085 g/cm3 and a softening point of 52°-70°C. A poor conductor of heat and electricity, it dissolves readily in ether and alcohol but is insoluble in water. It is composed of resin acids (80-95 percent) of the general formula C19H29COOH and of neutral unsaponifiable substances (5-12 percent).

Rosin is classified according to the type of raw material and to the method of preparation as follows: gum rosin (obtained by distillation of turpentine oil from refined turpentine), wood rosin (obtained by extraction of wood chips from tarred pine stumps using organic solvents, primarily gasoline), and tall oil rosin (obtained by fractional distillation of crude tall oil, a product of sulfate soap refining). Rosin and its derivatives are used in sizing paper and cardboard; as emulsifiers in the manufacture of synthetic rubbers, elastics, plastics, artificial leathers, linoleums, soap, varnishes, paints, and electrical insulating mastics and compounds; and as a flux in the tinning and soldering of metals.

REFERENCES

Vasechkin, V. S. Tekhnologiia ekstraktivnykh veshchestv dereva. Moscow-Leningrad, 1953.
Komshilov, N. F. KanifoV, ee sostav i stroenie smolianykh kislot. Mos-cow, 1965.

P. P. POLIAKOV

rosin

[′räz·ən]
(materials)
A translucent yellow, umber, or reddish resinous residue from the distillation of crude turpentine from the sap of pine trees (gum rosin) or from an extract of the stumps and other parts of the tree (wood rosin); used in varnishes, lacquers, printing inks, adhesives, and soldering fluxes, in medical ointments, and as a preservative.

rosin, colophony

A resin obtained as a residue in the distillation of crude turpentine from the sap of pine trees (gum rosin) or from an extract of the stumps and other parts of them (wood rosin).

rosin

a translucent brittle amber substance produced in the distillation of crude turpentine oleoresin and used esp in making varnishes, printing inks, and sealing waxes and for treating the bows of stringed instruments
References in periodicals archive ?
Natural resin acids present in rosin of Pinus spez., including isopimaric acid (1), mercusis acid (2), neoabietic acid (3), dehydroabietic acid (4), and podocarpic acid (8), as well as resin acid derivatives [beta], 9 [alpha], 13 [alpha]-H-tetrahydroabietic acid (5), 8 [alpha], 9 [alpha], 13[alpha],-H-terahydroabietic acid (6), 13 [alpha],-H-[delta] (8) -dihydroabietic acid (7), maleopimaric acid (9), and fumaropimaric acid (10), were studied for their possible inhibitory effects on Epstein-Barr virus early antigen (EBV-Ea) activation induced by 12-O-tetradecanoylphorabol-13-acetate (TPA).
The hexane soluble ([approximately equal to]35%) was further extracted in methanol, which is selective to the rosin components, and they were found to be [approximately equal to]86 percent.
And, by the way, if you are Rosin, you would think you'd be more careful talking about "brainwashing." It was her side that dredged up the ridiculous, reason-free "war on women" meme, one which, as the public thinks more deeply, is beginning to lose its hold.
vill provide rosin resin chemistry on the forefront of technology that will offer the ink and vehicle formulator multiple solutions to improved ink performance.
is Japan's largest company in the pine chemical industry with the rosin being the main raw material, and is also a pioneer in the domestic industry.
Rosin offers close readings of Arthur Miller's play, "Death of a Salesman," to examine the effect of the American education myth on the individual, drawing on the fields of philosophy of education, sociology, anthropology, cultural studies, and journalism.
The coating is comprised of a mixture of from approximately 60%-95% weight of a dispersion of a copolymer of ethylene and acrylic or methacrylic acid; 5%-40% of a compatible adhesion enhancer selected from the group consisting of an aliphatic polyurethane dispersion, a hydrogenated hydrocarbon rosin or rosin ester dispersion, and an amorphous acrylic polymer dispersion; and from 0.05%-1.0% by weight of a metal hydroxide.
Survivors: wife Pamela (Drugg) of Troy, NH; son Patrick and his wife Franca of Millbury; daughter Tina Pike of Keene, NH, stepson Timothy Wilson of Troy, brothers Wayne and Carl, sisters: Mary Goodnow, Prinscilla Rosin, Dianna Michelson and Sylvia Michelson all of NH; grandchildren: Patrick, Gianna, Matthew, Jacob, Nathan and Hannah.
For those of you wondering about the difference between a rosin and a resin, that's actually a lesson I learned a few years ago from Sanju Arora at Cookson Electronics A paper we wrote on flux selection defined the relationship between the two material sets this way: "Rosins are a subset of a larger chemical family of resins.
Rosin WW is a 75[degrees]C softening point, low molecular weight rosin gum produced from natural, renewable resources.
The action centres on three lead cases involving the removal and retention of organs from babies Rosin a Harris, whose parents are from the Dorchester area,Daniel Carpenter, whose parents live in Norfolk, and LauraShorter, whose mother lives in the Oxford area.