Cellulose-based coatings

C. F. Vesey, S. C. Porter. Modified-release coating of pellets with an aqueous ethyl-cellulose-based coating formulation coating process considerations. Proceedings of the 13th Annual Meeting and Exposition of AAPS, San Francisco. 1998. 

Inhibited Cortec paper, grades VCI-146 and VCI-147, consists of a natural cellulose base coated from one side by a PE him. It is intended for protection of different metals against moisture and hostile gases (SO2, H2S) and contains neither nitrates, phosphates and chromates. 

Maftoonazad, N. Ramaswamy, H. S. (2005). Postharvest shelf-life extension of avocados using methyl cellulose-based coating. LWT - Food Science Technology, 38, 6, 617-624. 

Other. 2-Nitro-1-butanol is an excellent solvent for many polyamide resins, cellulose acetate butyrate, and ethylceUulose. It can be utilized in paint removers for epoxy-based coatings. 2-Hydroxymethyl-2-nitro-l,3-propanediol is usebil for control of odors in chemical toilets. Its slow release of formaldehyde ensures prolonged action to control odor, and there is no reodorant problem which sometimes is associated with the use of free formaldehyde. 2-Hydroxymethyl-2-nitro-l,3-propanediol solutions are effective preservative and embalming fluids. The slow Uberation of formaldehyde permits thorough penetration of the tissues before hardening. 

This isoindoline nickel complex pigment is mainly recommended for the coloration of metallics and effect coatings, especially for water based systems. P.R.271 affords yellowish to medium red shades, providing a bright flop in metallics. Alkyd/melamine resin systems may safely be overcoated and withstand exposure of 140°C for 30 minutes. The flow properties of P.R.271 in these systems and in polyester cellulose acetobutyrate base coat systems are good, but there is a certain tendency to flocculate. 

Special starch products have been developed for use as thickeners in coatings that are based on synthetic latex or resin binders. Starch-based thickeners can have associative properties when substituted with a hydrophobic reagent. They provide an alternative for cellulose-based thickeners, but their use is limited. 

Due to their low dehydration temperatures and water solubilities, boric acid and sodium borates (borax pentahydrate and borax decahydrate) are mostly used as fire retardants in wood/cellulosic products such as timbers, plywood, particle board, wood fiber, paper products, and cotton products. In recent years, boric acid has also been used as fire retardant in epoxy intumescent coating, pheno-lics, urethane foam, and so on. When necessary, boric acid can be coated with silicone oil such as silicone to alleviate its water solubility in water-based coating. 

J.K. Effect of some excipients and compression pressure 140. on the adhesion of aqueous-based hydroxypropyl methyl-cellulose film coatings to tablet surface. Drug Dev. Ind. 

Artefacts that arise from gas in the stomach and adjacent bowel often limit the diagnostic accuracy of abdominal ultrasound. Research to overcome this problem has focused on cellulose-based suspensions. An agent has been developed based on simethicone-coated cellulose— SonoRx (Bracco Diagnostics, Princeton, NJ), which displaces and disperses gas bubbles. In a phase 2 chnical study, 93 patients underwent upper abdominal sonography before and after a randomized dose of the contrast agent (200, 400, 600, 800, or 1000 ml) (15). Anatomical visualization was improved as follows the stomach in 82% of patients, the duodenum in 63%, the pancreatic head and body in 61%, and the pancreatic tail in 67%. There were 14 adverse events in 11 patients and only five were considered to be related to the contrast agent. The main adverse effects were mild diarrhea and nausea. 

Any plasticizers that are used with cellulose acetate phthalate to improve performance should be chosen on the basis of experimental evidence. The same plasticizer used in a different tablet base coating may not yield a satisfactory product. 

Ozturk AG, Ozturk SS, Palsson BO, et al. Mechanism of release from pellets coated with an ethyl cellulose-based film. J Control Release 1990 14(3) 203-213. 

Use Imparts water tolerance and vapor permeability to copolymer films latex and water-based coating compositions adhesion improver for cellulosics, concrete, glass cross-linking agent in polyester resins color photography. 

MIBK, after methyl methacrylate and bisphenol-A, is the third largest tonnage produd obtained from acetone. The world production of MIBK is about 2.5 millions tons per year. It is used as a solvent for cellulose- and resin-based coating systems, and as a raw material in the production of mbber antioxidants. 

Basic Functions in Water-Based Coatings Chronology of Water-Dispersible Cellulose Ethers Chemistry of the Major Ethers... 

Technology of the Cellulose Ethers in Latex Paints. Earlier in the discussion, the basic functions of these polymers in water-based coatings were briefly described. This section will describe some of the structural parameters of these ethers, and their influence on several important latex paint properties will be illustrated with Natrosol (hydroxyethyl)cellulose. 

USE To impart pearly surface to cellulose-base, polystyrene, and phenol-formaldehyde resins, Deutsch er of.. U.S. pat. 2,816,044 (1957 to Brit. Resin Prods.). In heat -sensitive coating for copying paper, Van Dam, (J.S. pat. 2,897,090 (1959 to Anken Chem. Film). To stabilize tolylenedi-amme mixtures against deterioration and discoloration. Powers, US. pat. 3,138,641 (1964 to Mobay). 

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