Nitrocellulose-coated cellophane

Cellophane is an old and respected packaging material which has been improved over the years. The two general types are coated with nitrocellulose (N/C) and polyvinylidene chloride (PVDC), respectively. Nitrocellulose-coated cellophane is moisture proof and useful for packaging dry products. It does not exclude oxygen or moisture completely, but for noncritical products it is entirely satisfactory. Baked goods are often packaged in this breathing type film. It is often used for cookies, candies, and rolls because its lack of taste and odor makes it very compatible with these products. 

A possible way to lower the cost of fibers and films of regenerated cellulose would be to run cellulose through a twin-screw ultrasonic extruder with a minimum of the solvent and passing the exudate through a stream of hot air to recover the solvent for reuse. This stronger cellophane could be used in place of many plastic films used today. The high moisture vapor transmission of cellophane is reduced by a coating of nitrocellulose or poly(vinylidene chloride), which also makes the film heat-sealable.79 Cel-... 

The most important areas of use of nitrocellulose lacquers are for coating wood, metal (e.g., automotive repair), paper, foil (cellophane, aluminum), leather, and textiles and in nail polish. 

Chem. Descrip. N-Ethyl o/p-toluene sulfonamide CAS 80-39-7 EINECS/ELINCS 201-275-1 Uses Plasticizer for nylon, shellac, cellulose acetate, protein materials, PVAc adhesives (metal-to-rubber joins, bookbinding, shoe), nitrocellulose lacquers food pkg. adhesives, coatings, paper, cellophane Features Makes compds. resist, to oils, soivs., and greases Reguiatory FDA 21CFR 175.105,175.300,175.320,176.170,176.180, 177.1200,177.1210... 

NFPA Health 0, Flammability 1, Reactivity 0 Uses Plasticizer, solvent, film-former in nitrocellulose lacquers, elastomers, explosives, nail polishes, solid rocket propellants, adhesives, sealants solvent for resins, perfume oils perfume fixing agent textile lubricant insect repellent nonreactive epoxy resin diluent safely glass printing inks paper coatings oral pharmaceuticals in food-pkg. adhesives in paper/paperboaid in contact with aqTfatly foods adjuvant in slimicides in food-contact paper/paperboaid in cellophane for food pkg. solvent for adjuvants in fo -contact crosslinked polyesters plasticizer in food-contact mbber articles for repeated use Regulatory FDA 21CFR 175.105,175.300,176.170,176.300,177.1200, 177.2420,177.2600 FDA approved for orals SARA reportable BP, EP compliance... 

Uses Solvent for syn. resins (nitrocellulose, ethylcellulose, CAB, some vinyl copolymers, PS, methacrylate resins), gums, plastics, oils and fats, cosmetics, pharmaceuticals solvent, flow aid, coalescent in paints/coatings, lacquers, printing inks organic synthesis odorant in perfumes recovery of acetic acid from dil. aq. sol ns. synthetic flavoring agent in foods and pharmaceuticals recovery and crystallization of drugs in food-pkg. adhesives in cellophane for food pkg. 

Uses Aviation gasoline additive octane booster in gasoline solvent for paints, gums, resins, rubber, inks, cleaners, adhesives, cosmetics, pharmaceuticals diluent, thinner in nitrocellulose lacquers thinner for perfumes, dyes alcohol denaturant process solvent adhesive solvent in plastic toys in extraction of various principles from plants mfg. of benzene, benzoic acid, benzaldehyde, toluene diisocyanate for PU resins, dyes, TNT for explosives, toluene sulfonates for detergents and dyestuffs adjuvant in resinous/polymeric food-contact coatings in paper/paperboard in contact with dry food in acrylic food pkg. in cellophane for food pkg. adjuvant for PC food-pkg. resins solvent in food-contact PPO resins in food-pkg. adhesives Regulatory FDA 21CFR 175.105, 175.320, 176.180, 177.1010, 177.1200, 177.1440,... 

Lion, the coating resin, which may be either nitrocellulose or saran, precipitates since they are insoluble in any of the conventional plasticizers used to soften cellophane, such as ethylene glycol, glycerin, or propylene glycol. After all the tetrahydro-furan is flashed off, the liquid plasticizer (9) is filtered from the precipitated coating resin (10) and the two thus separated for whatever further use is desired of them. ... 

Cellophane is used as a general protective wrapping material. Because of its good electrical properties, it is used in wire and cable construction and other electrical products. It also functions as a separator, barrier, or release film in plastic molding and lamination. To make it moisture proof, most of the cellophane film is coated with a lacquer composed of nitrocellulose, plasticizers, resins, and waxes. This coating can also give the cellophane film a heat-sealing property. 

Improved membranes have been the key to recent advances in ultrafiltration. The finest niter papers have pore diameters of as small as 1000 nm (1 micron) whereas ultrafilter membranes can be made with pore diameters from 1000 nm to as small as 2-3 nm. For many years cellophane or freshly formed films from collodion (nitrocellulose) were used, but now a number of manufacturers supply strong, flexible, and durable membranes of remarkably uniform pore size yet with high porosity, permitting rapid flow of water. Porous glass membranes have also been developed as well as porous carbon. Po rous ceramic with a microporous coating provides an ultrafilter highly resistant to high temperature and chemical attack. 

Modifying the hydrophilicity of starch has been the goal of many strategies, so as to improve the resistance of starch to water. Starch has been chemically modified by reaction with caprolactone, producing a thermoplastic that needs no plasticizer (74). Coatings can also be used, as when starch films are coated with an waterproofing layer of a nitrocellulose-wax blend, as is done with cellophane. Or, starch sheeting can be laminated with a water-resistant layer of poly(e-caprolactone) by coextrusion (75). 

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