Global ETD Search
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Showing 1 to 6 of 6 for “"carbonless"”.
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Fading of carbonless copying paper
The reactions of crystal violet lactone (CVL) (1) and carbazolyl blue (S-RB) (2) were studied on the acid activated clay Fulacolor. The colourless leuco dye CVL (1) undergoes lactone cleavage, when adsorbed on Fulacolor, to give a blue zwitterion. CVL (1) was also shown to adsorb as the unchanged …
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An investigation into the active sites in co-reactants for carbonless copying paper
… chemistry of materials used as co-reactants in carbonless copying paper and of some materials which show promise for such a use. The areas investigated include the ion exchange characteristics of acid activated clays, the reactivity of a primary dye, Crystal Violet Lactone(CVL), on a range of …
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Sonochemically-produced proteinaceous microspheres
… application since its industrial debut in carbonless copying paper some fifty years ago. Microencapsulated materials are found in a wide variety of technical, agricultural, food, and household products. There have been many methods developed for microencapsulation: from reverse-phase …
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Study of the Structure-Property Relationships That Determine the Effects of Latexes and Starch Containing Latex Emulsions on the Performance of the Barrier Coatings (Sub-coat) for Paper
<p>The history of carbonless paper dates back to the 1940s. Before this, a carbon copy sheet was needed between sheets of paper to be able to produce one or more copies simultaneously during writing. The pressure from a pen or typewriter would help deposit the ink of the carbon paper onto the blank …
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Reactions of leuco dyes on acid activated clays
The colour formers used in carbonless copying paper consist of admixtures of primary and secondary dyes. Work was carried out in this programme both on retarding the photofading of the primary dyes and on improving the reactivity of the clay minerals towards the development of the secondary dye. …
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Encapsulación de Aceites Esenciales de Clavo para su Aplicación en la Industria Alimentaria
… coatings for the manufacture of carbonless copying paper (Green and Scheicher, 1955). Encapsulation technology is now well developed and accepted within the pharmaceutical, chemical, cosmetic, foods and printing industries (Augustin et al., 2001; Heinzen, 2002). In food products, …