Solvents dimethyl phthalate

Ketone Peroxides. These materials are mixtures of compounds with hydroperoxy groups and are composed primarily of the two stmctures shown in Table 2. Ketone peroxides are marketed as solutions in inert solvents such as dimethyl phthalate. They are primarily employed in room-temperature-initiated curing of unsaturated polyester resin compositions (usually containing styrene monomer) using transition-metal promoters such as cobalt naphthenate. Ketone peroxides contain the hydroperoxy (—OOH) group and thus are susceptible to the same ha2ards as hydroperoxides. 

Isomerizations carried out in the liquid phase, using dimethyl phthalate as the solvent, yielded the Arrhenius equation... 

Storage and Handling Must be kept below 27° and not warmed over 30°. Do not add to hot materials. Do not add accelerator to this material. Store in original container with vented cap. Avoid bodily contact. This material is nearly always stored and handled as a 25% solution in an inert solvent. See also ACETYL PEROXIDE 25% solution (in dimethyl phthalate) and PEROXIDES, ORGANIC. 

Dibutyl phthalate is used in pharmaceutical formulations as a plasticizer in film-coatings. It is also used extensively as a solvent particularly in cosmetic formulations such as anti-perspirants, hair shampoos and hair sprays. In addition to a number of industrial applications, dibutyl phthalate is used as an insect repellent, although it is not as effective as dimethyl phthalate. 

Dimethyl phthalate is used in pharmaceutical applications as a solvent and plasticizer for film-coatings such as hydroxypropyl methylcellulose, cellulose acetate and cellulose acetate-butyrate mixtures. ... 

An important contribution from Hellrung and Balli22 concerned the thermo-chromism of a series of spiropyrans (11-20) in various solvents such as benzyl alcohol, dimethyl phthalate, decalin, toluene and xylene. 

The second example is the telomerization of phthalic acid with butadiene yielding bis(octadienyl) phthalates, which can then be hydrogenated to the bisoctyl phthalates which may be used as plastic softeners. The catalyst is formed from palladium bis(acetylacetonate) and tris(p-methoxyphenyl)phosphite in the polar solvent dimethyl sulfoxide. Once again the extraction can be carried out with isooctane [58, 59]. 

The cellulose acetate most suitable for coatings have acetyl contents ranging from about 38 to 40% and a hydroxyl range between 3.0 and 4.0%. The lacquer-type cellulose acetates possess certain fundamental characteristics that have made them difficult to formulate as coatings, yet it is exactly these characteristics that make them valuable in certain areas of the protective coating field. The cellulose acetates are soluble only in very strong solvents (Table IV). They respond well to latent solvents, but they have very low tolerance for hydrocarbons. Compatibility with resins is poor, only a dozen or so commercially available resins are compatible. Only very active plasticizers like dimethyl phthalate, triacetin, or dimethoxyethy1 phthalate will remain in the film without exudation. 

The polybutadiene used was Intene from I. S. Rubber [77] = 2.1 dl/g in cyclohexane at 30°C. Vinyl chloride and styrene monomers from Montedison were 99.99 and 99.5% pure respectively. Azobis(isobutyronitrile) (AIBN) from Fluka was 99% pure. Di-te/t-butyl peroxide was 95% pure. Tert-butyl peracetate was used at a 50% dilution with dimethyl phthalate. The n-butyl ester of 3,3- (di-te/t-butylperoxy)valerianic acid was 85% pure. Terf-dodecyl mercaptan, a commercial product of the Societe Nationale des Petroles d Aquitaine, was used as a modifier. The solvents used were commercial products purified by fractionation. 

Diluents such as dimethyl phthalate, dibutyl phthalate, tricresyl phosphate, silicone fluid, benzene, toluene, xylene, cyclohexane, dichloroethane, mineral spirit, water and fire-retardant pastes, and so on, are used which greatly lower the shock and heat sensitivity of peroxides. Care should be taken to maintain the storage temperature within the recommended temperatme range. Too much coohng can result in crystallizations of peroxides from their diluent solvents and can cause danger. 

Suitable samples for silica columns are acetanilide, short-chain phthalates such as dimethyl phthalate or diethyl phthalate and anisaldehyde. They exhibit weak interaction with the silica surface that prevents tailing. Good retention factors are obtained with methylene chloride-based or hexane-based mobile phases with small amounts of methanol, isopropanol,. or acetonitrile. Examples are hexane with 0.5% acetonitrile, methylene chloride with 0.5% isopropanol, or methylene chloride with 0.1% methanol. To ensure rapid equilibration with the mobile phase, the mobile phase should be half-saturated with water. For a 5-nm column, a good linear velocity in these solvents is between 2 and 3 mm/s. Nitroaromatics are used sometimes as samples for the testing of silica columns, but they may exhibit peak tailing depending on the pretreatment of the silica. 

Coatings with Thermoplastic Fluoropolymers. Poly(vinylidene fluoride), PVDF, is the only conventional thermoplastic fluoropolymer that is used as a commercial product for weather-resistant paints. This crystalline polymer is composed of -CHjCFj- repeating units it is soluble in highly polar solvents such as dimethyl-formamide or dimethylacetamide. Poly(vinylidene fluoride) is usually blended with 20 30 wt% of an acrylic resin such as poly(methyl methacrylate) to improve melt flow behavior at the baking temperature and substrate adhesion. The blended polymer is dispersed in a latent solvent (e.g., isophorone, propylene carbonate, dimethyl phthalate). The dispersion is applied to a substrate and baked at ca. 300 °C for ca. 40-70 s. The weather resistance of the paints exceeds 20 years [2.16]-[2.18]. 

Butyl benzyl phthalate Dibutyl phthalate Dimethyl phthalate Styrene Triphenyl phosphate solvent, aerosols... 

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