摘要:
The present invention relates to a modified cellulose ester containing unsaturated pendent groups which can be prepared by reacting a cellulose ester containing residual hydroxyl groups with, for example, maleic anhydride in acetic acid solvent with sodium acetate catalyst. The modified cellulose ester is not homopolymerizable but will copolymerize in the presence of vinyl crosslinking agents and a photoinitiator upon exposure to ultraviolet radiation. The modified cellulose ester is useful as a protective and/or decorative coating for wood, metal, plastics, paper, board, and other substrates, as well as an additive to printing inks, and as a nail polish. In addition, because of the propensity for the pendant carboxyl groups to form hydrophilic salts with amines, the modified cellulose esters can be formulated to be water-dispersible.
摘要:
A top coat nail polish composition, which is at least substantially free of ketones and aromatic solvents as well as formaldehyde containing resins and nitrocellulose, contains at least one cellulose ester, a mixture of aliphatic and cycloaliphatic solvents for the cellulose ester, a plasticizer for the cellulose ester, at least two UV blocking agents having different effective UV wavelength blockage ranges, a smoothing agent, an adhesion promoter, and an alkanol solvent for the smoothing agent and the adhesion promoter.
摘要:
Water soluble or water-dispersible cellulose acetoacetate esters are prepared by contacting a cellulose material with diketene, an alkyl acetoacetate, 2,2,6-trimethyl-4H-1,3-dioxin-4-one or a mixture thereof and a carboxylic anhydride in a solvent system comprising lithium chloride plus a carboxamide. Compositions containing the cellulose acetoacetate esters are useful for coatings applications.
摘要:
The invention relates to an aqueous coating composition a film or barrier layer. The aqueous coating, in a pseudoplastic thixotropic mixture having a yield point, can be applied to surfaces in heated food preparation units. The composition can be easily applied to a variety of surfaces, and can advantageously cling to vertical or substantially inclined surfaces in order to form a barrier film or coating. The coating can result in a smooth uniform coating. The film, upon heating forms a barrier layer which can facilitate the removal of food soils which can form during food preparation activities after formation of the barrier film layer. The compositions of the invention can be used in methods for coating the interior heated surface of food preparation units by applying the aqueous material through a spray or other aerosol apparatus to form a clinging aqueous coating. Upon heating, the water from the coating can evaporate leaving an organic/inorganic film which can support baked-on food soil and promote easy removal. The compositions and methods of the inventions entail the use of food safe materials approved for contact with comestible substances.
摘要:
Water soluble cellulose acetoacetates prepared by contacting a cellulose material with diketene, an alkyl acetoacetate, 2,2,6-trimethyl-4H-1,3-dioxin-4-one or a mixture thereof in a solvent system comprising lithium chloride plus a carboxamide. Compositions containing the cellulose acetoacetates and, optionally, a crosslinking agent are useful for coatings applications.
摘要:
A varnish prepared from a phenol modified copal resin and linseed oil, containing Co and Pb naphthenate, has a finely divided silica aerogel (see Division C1) incorporated as flatting agent (Example 13). The silica has a particle size range of 0.1-5.5 m , an average particle size below 2.5 m , a bulk density of 0.8-18 x 10-3 g./c.c., and a pore volume of at least 1000 c.c./g., and has been prepared by comminuting a silica aerogel in the presence of superheated water vapour.ALSO:A drying oil or phenolic or alkyd resin varnish contains as a flatting agent a silica aerogel which has a particle size range of 0.1-5.5 m , an average particle size below 2.5 m , a bulk density of 0.8-18 x 10-3g.l./c.c., and a pore volume of at least 1000 c.c./g., and has been prepared by comminuting a silica aerogel in the presence of superheated water vapour (see Division C1). Varnishes exemplified are: linseed oil modified glycerin-phthalic anhydride alkyl resin (Exemples 5, 7, 11 and 16), phenolic varnish prepared from p-tertiary amyl phenol, formaldehyde, linseed oil, and tung oil (Examples 6 and 12), linseed oil-ester gum (Example 14), nitrocellulose-wood lacquer (Examples 8 and 15), cellulose acetate lacquer (Example 9), ethyl cellulose lacquer (Example 10). Other constituents and solvents are listed in the examples.ALSO:A finely divided silica aerogel having a particle size range of 0.1-5.5 m , an average particle size below 2.5 m , a bulk density of 0.8-18 x 10-3 g/cc., and a pore volume of at least 1000 cc/g., is prepared by comminuting a silica aerogel in the presence of superheated water vapour. Comminution may be effected in a fluid energy mill, into which water vapour at 250-750 DEG C. is introduced, preferably in a plurality of multidirectional streams, at a rate sufficient to give a pressure of 1.0-200 p.s.i.g. in the cone and to produce turbulence and fluidization of the particles. It may be operated continuously. Alternatively, ball or hammer mills may be used. The heating zone may be preheated, but the temperature is usually maintained by the hot vapour. The treated silica and vapour are separated, e.g. by gravity, at above 250 DEG C. The starting silica may have a pore volume of 600-800 cc/g., a bulk density of 30-35 x 10-3 g/cc., and a particle size range of 1 m - 1/2 11, preferably 4 + 8 U.S. mesh. An example of its preparation by ion-exchange of an ethanol aquasol followed by heating under pressure is given. The product is used as a flatting agent in varnishes.