Abstract: The invention provides a novel enterosoluble capsule for containing a medicament, which is shaped with a hitherto not used novel cellulose derivative. The cellulose derivative is a mixed ester of an alkyl-, hydroxyalkyl- or hydroxyalkyl alkylcellulose esterified with succinyl anhydride and an aliphatic monocarboxylic acid anhydride. The enterosoluble capsules have excellent enterosolubility behavior as well as sufficient pliability even without the addition of a plasticizer which is almost indispensable in the prior art materials. The cellulose derivative can be shaped into capsules not only by the conventional dipping method but also by the plastic deformation at an elevated temperature under pressure such as compression molding, vacuum forming, matchedmold forming and the like.

Abstract: Removal of haze from plastic articles made of cellulose acetate butyrate, such as light polarizing sunglass lenses made of cellulose acetate butyrate and polyvinyl alcohol, is accomplished by immersing said plastic articles in a substantially water-free bath composition at least 70 weight percent of which comprises an active solvent and a carrier solvent, the former being methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, or any mixture thereof, and the latter being ethylene glycol, glycerol, tricresyl phosphate, butyl phthalate, or any mixture thereof. Preferred values of the relative proportions of the active solvent and the carrier solvent are in the range of 90-5 and 10-95 weight percent, respectively, and more preferably, 80-10 and 20-90 weight percent, respectively.

Abstract: Process for recovering entrained cellulose ester fines from scrubber-coolant water by forming a wet foam containing the fines, floating the wet foam upwardly in a vertically disposed foam flotation column and outwardly along a horizontal straight-line path from which liquid from the wet foam is drained and the fines are introduced in the form of a drier foam into a vessel for subsequent dissolving of the fines, with the horizontal straight-line path being pitched downardly from the horizontal plane.

Abstract: Polymers from the group consisting of cellulose and its ester and ether derivatives, of polyvinyl alcohol and its ester derivatives, polymers with vinyl esters and homopolymers and copolymers of acrylates and methacrylates are modified with monofunctional or difunctional cyclic .beta.-ketonic acids or their esters, in particular with succinylsuccinic acid or its ester derivatives. The modified polymers are particularly suitable for obtaining semi-permeable membranes for osmotic separation methods.

Abstract: A novel cellulose derivative provided in this invention is a mixed ester of an alkoxy or hydroxyalkoxy substituted cellulose ether, prepared by the esterification reaction of the ether with succinic anhydride and an anhydride of an aliphatic monocarboxylic acid. The cellulose derivatives are advantageous because of their capability of producing enteric coatings having sufficient flexibility without the use of a plasticizer as well as by their chemical and physical stability against moisture, and also by easy purification after completion of the esterification reaction. The coatings produced from the derivatives have a similar chemical and physical stability. The cellulose derivatives are useful for the enteric coating of pharmaceutical dosage forms and also for providing halation-preventing layers on photographic films.

Abstract: Cellulose propionate n-butyrate adapted to be mixed with an oil-modified alkyd resin to form a coating composition. The cellulose propionate n-butyrate has unique properties as an ingredient in such coating composition. The cellulose ester has a n-butyryl content of between about 3% and about 5%, a propionyl content of between about 40% and about 50% and a hydroxyl content of between about 2% and about 3%. The coating compositions are especially useful for protection and appearance when used as a coating on such items as wooden furniture.

Abstract: This invention comprises a gas-permeable contact lens consisting essentially of a plasticized cellulose resin selected from a partially esterified or partially etherified cellulose polymer plasticized with a compatible plasticizer in an amount sufficient to increase the gas permeability of the cellulose resin.

Abstract: There is disclosed the preparation of a gradable polymeric composition by the chemical modification of a polymeric material such as a polymer or copolymer. The preparation comprises reacting in the presence of free radicals the polymeric material with a non-polymeric organic reagent having a structure which contains both a hydrocarbon residue and a polymeric material-degradation-sensitizing group.

Abstract: A new composition, cellulose acetate-chlorobutyrate pyridinium salt, which has superior biodegradation resistance and polymer membrane forming characteristics and related compositions.

Abstract: Cellulose esters, such as cellulose acetate and/or cellulose acetate butyrate, prepared in the form of gel beads are active as adsorbents, especially for debittering of fruit juices by removal of limonin.

Abstract: This invention comprises a gas-permeable contact lens consisting essentially of a plasticized cellulose resin selected from a partially esterified or partially etherified cellulose polymer plasticized with a compatible plasticizer in an amount sufficient to increase the gas permeability of the cellulose resin.