In map production a relatively large part of the total expenses are spent for the field survey. Contrary to photogrammetric procedures field surveys could hardly utilize the modern achievements of automation directly. This will be changed by the new Zeiss surveying instruments. The Zeiss RegElta 14 measures a distance automatically, reads this distance, the horizontal direction, and the vertical angle, and records these data together with identifying numbers on a tape. This creates a direct link between field survey and computer.

Imaging by photopolymerization and photoelectropolymerization

Author: Levinos, Steven

A review with 30 references, chiefly of patents, which covers colored photopolymeric images, photoelectropolymn., and dye-sensitized photopolymerization

Offic. Dig., J. Paint Technol. Eng.

Adsorbed resin layer in the dispersion of pigmented alkyd systems

Author: Rothstein, Edwin C.

In determining the effect of an adsorbed resin layer and its thickness on the dispersion of pigmented alkyd compositions, 4 factors were considered: (1) type of fatty acid modifier in the resin, (2) oil length of resin, (3) type of solvent used in the vehicle, and (4) type of pigment dispersed.Materials used included phthalic anhydride, lauric, linoleic, and oleic acids, xylene, BuOAc, MeCOEt, ground quartz SiO₂, anatase TiO₂, and phthalocyanine.Sp. viscosities were determined for suspensions after being dispersed for 24 hrs.The formula used was η_sp = (η_susp - η_soln)/η_soln, where η_susp is the viscosity of the suspension and η_soln is the viscosity of the corresponding supernatant solutionThis was then used to determine the hydrodynamic volume fraction and the particle radius.The resin adsorption characteristics, measured in dilute suspensions, determined such characteristics of the paint film as adhesion, gloss, and tint retention.The adsorption is a function of solvent (resins have greatest solubility in MeCOEt), mol. weight, resin oil length, and pigment of equivalent surface area.The lower the sp. viscosity at low surface coverage, the more rapidly complete dispersion takes place.Adsorption is directly proportional to mol. weight and inversely proportional to the solvent power of the dispersion solvent.Through the ability to determine the adsorption film layer, it is hoped that a better understanding of the effect of solvent-resin-pigment on the dispersion of the polymer system will be possible.

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