Crosslinkers, coating

For resistance to acid conditions alone, traditional filled and unfilled bituminous solutions (which have economic advantages), chlorinated rubber and shellac have been used. Crosslinking coatings, e.g. amine-cured epoxy resins, often blended with coal-tar which develops resistance to oils and solvents, have obvious advantages on chemical plant. 

Most recently, we reported small molecule arrays on photoaffinity crosslinker coated gold surfaces (17). The small molecule arrays were fabricated by photoreaction, and then analyzed by SPR imaging technique. The small molecules don t have to be modified chemically for immobilization. The small molecules, which can interact with a target protein, can be screened by this methodology. Therefore, the integration of photoaffinity small molecule array and SPR imaging technique can be the first step of reverse chemical genetics. 

JP 05197182 (Japanese) 1993 Electrophotographic Photoreceptor with Amorphous Silicon Pho-toconductive Layer Fuji Xerox Co. Ltd., Japan S Yagi et al. Copolymer useful for surface protective coating photoreceptor shows stability and gives sharp images Maleimide-terminated siloxane-imides crosslinked coatings were used to protect photoreceptors. 

Stancell et. al. ( 0) reported the possible use of ultrathin films deposited onto relatively permeable substrates as permselective membranes. Ultrathin and highly crosslinked coatings effectively distinguish between molecules of different sizes and increase the permselectivity of the substrate film. Chang et. al. ( ) demonstrated that the permeability coefficient of silicone rubber to oxygen decreased noticeably after depositing a plasma-polymerized ethylene film on the surface. Colter, et. al. (92.93) found similar effects of plasma polymerized films as diffusion barriers in controlled-released drug delivery systems. 

Cyclic carbonate functional polymers have been explored on a limited basis over a number of years. The cyclic carbonate group is an attractive functional group due to its reactivity with primary amines at ambient or slightly elevated temperatures to form crosslinked networks [7]. Cyclic carbonate functional polymers will also react with carboxylic acid functional polymers [2] at higher temperatures to form crosslinked coatings. 

To form crosslinked coatings, the polymer must be free of unreacted functional monomer that would act as a chain terminator in the crosslinking reaction. The unreacted VEC could be easily removed from the acrylic copolymer by passing the resin solution through a wiped film still under vacuum, then redissolving the polymer in solvent. GC analysis indicated that the unreacted VEC had been totally removed. 

For alumina, titania, and zirconia, there exists as yet no covalent bonding chemistry that is equivalent to the silanization technique used for silica. Although attempts have been made to silanize these other oxides, the hydrolytic stability of these phases does not match up to the hydrolytic stability of the support itself. Therefore alternative surface modification tet ques have been developed that do not rely on the attachment of the modifier to the surface. The coating can be simply insoluble in the intended mobile phases, or a crosslinked coating can be formed that stretches like a net around the skeleton of the particle. Both techniques are, in principle, independent of the nature of the substrate and can be applied to all inorganic or polymeric packings. 

Chem. Descrip. Polyol derived from castor oil Uses Modifier imparting improved performance in high solids formulations such as PU, epoxy, and melamine crosslinked coating systems improves pigment wetting, flow and leveling, gloss Features Improves UV resist., chem. resist., and weafherability VOC reduction... 

Chem. Descrip. Aliphatic urethane diol resin modifier Uses Modifier for amino or isocyanate crosslinked coatings, elastomers, and adhesives, automotive, aerospace, wood/paper, and general industrial coatings, and inks Features Water-sol. reduces VOCs... 

Pbenylmercuric acetate, Rozone 2000 modifier, amino crosslinked coatings... 

Design and synthesis of hybrid polymers and of dendrimers for special applications and as building blocks for carbosilanes, polysilanes catalysis and highly crosslinked coatings. 

More recently, a number of interstitially crosslinked coating materials have been prepared.These are blends in which a water-soluble or water-dispersible resin, capable of crosslinking, is blended with an ordinary thermoplastic emulsion. The main resins include aminoplast, phenol-formaldehyde, polyurethane, epoxy, and drying oils. Applications include sealants, adhesives, and architectural coatings. 

B. G. Bufkin and J. R. Grave, Survey of the Applications, Properties, and Technology of Crosslinked Emulsions V, J. Coatings Tech. 50(12), 65 (1978). Reviews interstitially crosslinked coatings. Phenol-formaldehyde dispersed in water, etc. Sealants, adhesives, architectural coatings. 

The most common resins used are vinyls, chlorinated rubber, acrylics, epoxies, urethanes, polyesters, autooxidative crosslinking coatings, and water-soluble resins. 

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