Alkyd resins modified

The alkyd resins are of value because of their comparatively low cost, durability, flexibility, gloss retention and reasonable heat resistance. Alkyd resins modified with rosin, phenolic resin, epoxy resins and monomers such as styrene are of current commercial importance. 

Urethane alkyds and urethane oils are oil and alkyd resin-modified polyurethanes dissolved in a volatile solvent. Upon application and solvent evaporation, the coating is crosslinked and cured via oxidation by atmospheric oxygen. 

The phthalic alkyd class is broken down into resins which are unmodified, resins which are modified, except with rosin and rosin ester, and finally resins which are modified with rosin and rosin ester. Under each class various chemical compositions are broken out for purposes of analysis. The alkyd resins modified with rosin and rosin ester are going to be considered in the rosin ester class of materials rather than the phthalic alkyd class of materials. Figures on phthalic alkyds have been available since 1933 11), The Tariff Commission has used more than one type of breakdown over this period. In 1946 they broke down total alkyds into two classes oil-type alkyds as compared with other than oil-type alkyds. Before and after that year, this breakdown was not made. 

Alkyd resins modified with compounds such as styrene, vinyl toluene, and methyl methacrylate have become more important in... 

Uses Curing agent for epoxy resins corrosion inhibitor for nonaq. lubricating oils intermediate for prep, of alkyd or unsat. polyester resins alkyd resin modifier chemical intermediate for esters, amides, imides, etc. vise, improver in lubricants gellant for greases paper sizing agent surfactant Manuf./Distrib. Dixie... 

Polybutadiene glycol Properties M.w. 1350-2800 Uses Cable joint potting compds. pipe sealants alkyd resin modifier PU adhesives binder rocket fuel binder... 

Low-molar-mass poly(butadiene) oils with 80%-97% cw-1,4 contents are produced with other Ziegler catalysts (for example, cobalt compounds with alkyl aluminum chlorides or nickel compounds with trialkyl aluminum and boron trifluoride-etherate). The products have few cross-links and dry as fast as wood oil and faster than linseed oil. Conversion of the poly (butadiene) oils with 20% maleic anhydride gives air-drying (air-hardening) alkyd resins. Modified poly (butadiene) oils stabilize erosion-endangered soils. Because of its low viscosity, the aqueous emulsion penetrates the surface soil layers. The surface crust is reinforced by an oxidative bonding process. Since no skin is formed on the soil crust, the aqueous absorption characteristics of the soil are retained. 

PEG polyesters with unsaturated dibasic acids such as maleic acid are used to modify polyester resins for paints so as to improve their elasticity and scratch resistance. Alkyd resins modified with PEGs can be made so hydrophilic that they are dispersible in water [17]. 

In coatings and adhesives, isocyanates may be used as reactive species at room temperature, or by modification, at high temperatures. Most urethane varnishes, however, are probably solutions of alkyd resins modified by reaction of free hydroxyl groups with diisocyanates. 

---