Pigments soluble

A polyester-type fluorescent resin matrix (22) is made by heating trimellitic anhydride, propylene glycol, and phthaUc anhydride with catalytic amounts of sulfuric acid. Addition of Rhodamine BDC gives a bright bluish red fluorescent pigment soluble in DME and methanol. It has a softening point of 118°C. Exceptional heat resistance and color brilliance are claimed for products of this type, which are useful for coloring plastics. 

The binding of carotenoids within the lipid membranes has two important aspects the incorporation rate into the lipid phase and the carotenoid-lipid miscibility or rather pigment solubility in the lipid matrix. The actual incorporation rates of carotenoids into model lipid membranes depend on several factors, such as, the kind of lipid used to form the membranes, the identity of the carotenoid to be incorporated, initial carotenoid concentration, temperature of the experiment, and to a lesser extent, the technique applied to form model lipid membranes (planar lipid bilayers, liposomes obtained by vortexing, sonication, or extrusion, etc.). For example, the presence of 5 mol% of carotenoid with respect to DPPC, during the formation of multilamellar liposomes, resulted in incorporation of only 72% of the pigment, in the case of zeaxanthin, and 52% in the case of (1-carotene (Socaciu et al., 2000). A decrease in the fluidity of the liposome membranes, by addition of other... 

PHYSICAL PROPERTIES white amorphous powder or white solid odorless has the greatest covering power of all inorganic white pigments soluble in hot concentrated sulfuric acid and hydrogen fluoride insoluble in water, hydrochloric acid, nitric acid, dilute sulfuric acid, and alcohol very high refractive index MP (1855°C, 3371°F) BP (2500-3000°C, 4532-5432°F) ND (3.9-4.3 gW) SG (3.9-4.3) CP (55.0 J/K-mol crystal at 25°C) VD (NA) VP (0 mmHg approximately). 

RicdoiiidNis. R. A C,5H,05 Mr 285.23, red pigment, soluble in polar solvents (HjO, CH3OH, DMSO) on addition of strong acids. Major anthocyanidin (see an-thocyanins) of the cell wall (membranochrome) of... 

Zinc Sulfide (1851) n. Pigment white 7 (77975). ZnS. Yellowish white pigment, soluble in acids, and insoluble in water. Certain specially treated grades of this pigment are used as fluorescent pigments. Density, 4.0g/cm (33.3lb/gal) O.A., 13 particle size, 0.25 pm refractive index, 2.37. 

Chlorophylls and phaeophytins are fat-soluble pigments. Chloro-phyhdes and phaeophorbides are hydrophUic pigments soluble in water due to the absence of phytol. The colours of chlorophylls and derived products are given in Table 9.8. 

Azo colors comprise that largest group of certified colorants. They are characterized by the presence of one or more azo bonds (—N=N—) and are synthesized by the coupling of a diazotized primary aromatic amine to a coupling component, usually a naphthol. Certifiable azo colors can be subdivided into four groups insoluble unsulfonated pigments, soluble unsulfonated dyes, insoluble sulfonated pigments, and soluble sulfo-nated dyes. 

Blistering and delamination of organic coatings caused by osmotic pressure driven water permeation. Corrosion inhibitor pigment solubility increases from right to left (Sinko, 2001). 

Lead II) chloride, PbCl2. Insoluble cold water, sparingly soluble hot. Matlockite is PbFCl. PbCL forms many complex chlorides and also basic chlorides. Cassel yellow (approx. PbCl2 7PbO) is prepared by fusion of the constituents and is used as a pigment. 

The most common of the xanthophyll pigments, it is present in all green leaves, in blossoms and in various animal sources. It crystallizes in violet prisms with one molecule of methanol m.p. I93 C, soluble in organic solvents giving yellow solutions, li is related to a-carolene in the same way as zeaxanlhin is to /1-carolene. 

The phthalocyanines must be suitably dis-p>ersed to be used as pigments or they can be sulphonated to water-soluble forms for dyeing and for precipitation as lakes. The dispersion is carried out by solution in sulphuric acid, followed by precipitation in water. 

Use of dimethylaminoethyl (also rert-butylaminoethyl) methacrylate as a monomer permits the introduction of pendent amino groups which can serve as sites for secondary cross-linking, provide a way to make the copolymer acid-soluble, and provide anchoring sites for dyes and pigments. 

Most textile fibers are delustered with 0.1—3.0 wt % Ti02 to reduce the gHtter and plastic appearance. Many PET fibers also contain optical bTighteners (17). Through the use of soluble dyes or pigments, including photochromic pigments (19), a wide variety of producer-colored fibers and effects is available. 

The FD C certified colors are all water-soluble dyes, but can be transformed into insoluble pigments known as lakes by precipitating the dyes with alurninum, calcium, or magnesium salts on a substrate of aluminum hydroxide. The lakes are useful in appHcations that require color whereas in dry form, such as cake mixes, or where water may be present and bleeding is a problem, such as food packaging. FD C Red Lake No. 3 was deHsted in Febmary... 

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