Solvent-soluble plant gums

Solvent-Soluble Natural Polymers. The exudate of the lac insect is dissolved in alcohol to yield shellac. This solution has adhesive properties and should be reversible by treatment with the appropriate alcohol or similar solvent, although it may present problems in other performance areas (8). Solvent-soluble plant gums, especially coniferous resins (e.g., from firs or pines) can be dissolved in organic solvents and used as adhesives. Solvent solutions of some plant waxes may also have limited utility in gluing. All such glues should be reversible by treatment with solvents similar to those they were dissolved in when applied. 

Gums are substances exuded by plant organs, which may be concentrated by drying them up and are not soluble in organic solvents. Gums are complex structures characterized by a... 

A r. is a perfumery and - flavor material that is prepared from natural resinous substances by - extraction with hydrocarbon solvents, e.g., petroleum ether, benzene or butane. Resinous materials are balsams, gum-resins, natural resins (- re-sins, natural), oleo-gum resins, etc. R. contain all hydrocarbon-soluble matters from these substances, which are the odorous matters, plus rosin acids, rosin acid anhydrides, sesquiterpenes, plant colors and waxes. They are generally viscous liquids, semi-solid or solid, homogeneous, noncrystalline masses. Like their equivalents, obtained from live (cellular) plant material, the concretes, r. can be further purified to - absolutes. 

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