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Polycarbonate, a polymer having extremely useful properties, was incorporated in linseed and DCO alkyds of various oil lengths. Compatibility of polycarbonate and alkyds has been investigated. It was found that though polycarbonate was compatible with glyceryl phthalate, it was not compatible with alkyds (oil modified) in general. However, small amounts (4 to 10%) of the polycarbonate could be successfully blended with alkyds particularly with the short oil alkyds. Film properties of these blends were examined and compared with plain alkyds and epoxy modified alkyds in order to determine the usefulness of the polycarbonate‐alkyd blends. It was found that polycarbonate modified alkyds, even with such a small amount of polycarbonate, were superior in film characteristics to both the plain as well as epoxy modified alkyds.

Demands for coatings with superior technical characteristics have induced the use of composite coatings, which usually represent an extremely strong product. The resin blend technique is a simple and useful method for improving paint properties. Coal tar resins are the most economical coating extensively used in the industry; short oil‐length alkyd resins are usually used for air and force‐dry industrial coatings for metal surfaces. The purpose of this paper is to evaluate coating blends composed of these resins, in particular, the effects of short oil‐length alkyd additive on the properties of coal tar binder.

One way to achieve new types of binders is to make combinations of the existing ones, in an ideal case retaining the desirable properties of both. The alkyd has important properties over the original drying oil. To achieve the goal of improving coal tar resin properties, short oil‐length alkyd was blended with it. The prepared short oil‐length alkyd was characterised using IR and ¹HNMR spectroscopy. The mixing ratio of short oil‐length alkyd with coal tar was up to 25 per cent. The compatibility of coating blend was characterised by scanning electron microscope. The physical, mechanical and chemical properties of the coating blend in addition to the corrosion resistance were determined according to ASTM methods.

In spite of a large number of synthetic resins being available for use in paint formulations, the alkyd resins surpassed all of them in versatility and low cost. The blend of short oil‐length alkyd resin with coal tar has yielded better coating blend properties. The coating blend showed significant enhancement of physical, mechanical and chemical properties such as gloss, drying time, adhesion, scratch hardness, acid and solvent resistance because the coating blend combines the properties of thermosetting and thermoplastic resins.

Alkyd resins are the most extensively used synthetic polymers in the coating industry. Modification of coal tar blend based on other type of polyester resins could also be studied in order to assess the applicability of the coal tar blend system found for other applications.

These types of alkyd resins can be applied in other bitumen composites as additives and reinforce agent.

The paper shows how the low‐cost modified coal tar binder can be used for air and force‐dry industrial coatings for metal surfaces.

Polycarbonate was incorporated in castor oil and nigerseed oil alkyds of various oil lengths. Compatibility of polycarbonate with these alkyds was investigated. It was found that only a small amount (4 to 10%) of polycarbonate could successfully be blended with these alkyds. Film properties of these blends were examined and compared with those of amino alkyd blends, in order to determine the usefulness of the polycarbonate alkyd blends. It was observed that polycarbonate modified alkyds, even with a small amount of polycarbonate were superior in film properties as compared to amino modified alkyds, especially with respect to chemicals and physical properties.

Polystyrene glycol was prepared and incorporated into nigerseed oil and castor oil alkyds representing semi‐drying and non‐drying type alkyds respectively. Compatibility of polystyrene glycol with these alkyds was investigated. It was found that 11 to 12 per cent polystyrene glycol could successfully be blended with these alkyds. In order to determine usefulness of these polyblends, film properties were examined and compared with those of plain alkyds. It was observed that polystyrene glycol modified alkyd blends were superior in film properties as compared to plain alkyds.

Polybisphenol phthalate was synthesized by the melt poly condensation process and its physical and spectral data were determined. It was blended in different proportion with linseed alkyds of various oil length. Film properties of these blends were studied and were compared with those of plain linseed alkyds. It was observed that chemical properties of the blends, containing 10 and 25 per cent polybisphenol phthalate were superior to those of the plain alkyds and the blends containing 50 per cent polybisphenol phthalate. The mechanical properties such as scratch hardness of the polybisphenol phthalate alkyd blends were inferior to those of the plain linseed alkyds.

Alkyds are the work horse of paint industry. In order to obtain desired film properties, alkyd resins are frequently modified by other resins and polymers either by physically blending them or chemically incorporating them. Some of the recent physical modifications of alkyds have been described in this first part of the article. The chemical modifications will be described in the second part.

Polystyrene glycol was prepared and incorporated into linseed alkyd. Compatibility of polystyrene glycol and alkyd was investigated. It was found that 20 per cent polystyrene glycol could successfully be blended with linseed alkyd. Film properties of these blends were examined and compared with those of plain alkyd. It was observed that polystyrene glycol modified linseed alkyds were superior, in film properties, to the plain alkyd except in solvent resistant property.

Reports a comprehensive study of the effects of blend ratios (aliphatic alkyd and cyclohexanone formaldehyde resins) on coating properties. Solvent and drier systems used for preparation of blends are also included in the present work. The properties studied were hardness, adhesion, flexibility, gloss, storage stability, impact resistance, chemical resistance and drying time. A blend ratio of 50:50 (w/w) aliphatic alkyd‐ketonic resins showed a significant improvement in adhesion, hardness, gloss, storage stability and acid resistance.

The alkyd resin of short oil length with low acid value was modified with novolac‐based epoxy esters, prepared by using tobacco seed oil fatty acids. The prepared blends were cured using an aliphatic amine as curing agent. The films of cured resins were applied over various panels and their film characteristics were studied. It was found that the scratch hardness and corrosion resistance increased with the increase of epoxy esters in the blend. The chemical resistance was also studied and found to be better with increasing epoxy esters in the blends.

Water soluble vehicles based on unsaturated fatty acids and oils have been prepared which have gloss and are air‐drying. Resin blends have also been prepared to improve certain characteristics. Comparison of the prepared compositions regarding their evaluation as a paint vehicle has also been taken into consideration.