Polyamide dimer acid-based

The most important coating appHcation for the nonreactive polyamide resins is in producing thixotropy. Typical coating resins such as alkyds, modified alkyds, natural and synthetic ester oils, varnishes, and natural vegetable oils can be made thixotropic by the addition of dimer acid-based polyamide resins (see Alkyd resins). Specialty high performance coating appHcations often requite the properties imparted by dimer acid components. 

Certain specialty nylon resins with low melting temperatures have been used quite successfully with extrusion techniques. Both nylon and high-molecular-weight polyamide resins that are chemically related to dimer acid-based polyamides are used in high-strength metal-to-metal adhesives they are applied by extrusion. ... 

Low-melt-flow index dimer acid-based polyamide (Versamide) Aluminum 1.4-6.8(200-1,000) [27] ... 

Later, another supplier of dimer acid. Union Camp, introduced a variety of dimer acid-based polyamides under the trade name Uni-Rez (Table 4). 

In polymer applications derivatives of oils and fats, such as epoxides, polyols and dimerizations products based on unsaturated fatty acids, are used as plastic additives or components for composites or polymers like polyamides and polyurethanes. In the lubricant sector oleochemically-based fatty acid esters have proved to be powerful alternatives to conventional mineral oil products. For home and personal care applications a wide range of products, such as surfactants, emulsifiers, emollients and waxes, based on vegetable oil derivatives has provided extraordinary performance benefits to the end-customer. Selected products, such as the anionic surfactant fatty alcohol sulfate have been investigated thoroughly with regard to their environmental impact compared with petrochemical based products by life-cycle analysis. Other product examples include carbohydrate-based surfactants as well as oleochemical based emulsifiers, waxes and emollients. 

The solid fatty dimer polyamides are related to nylons and, indeed, are considered nylons when based on highly purified dimer acid (11). When based on a less pure version of dimer acid, they are, of course, of considerably lower molecular weight than nylons and have a much lower order of crystallinity. 

Fan, X.D. Y. Deng J. Waterhouse P. Pfromm. Synthesis and characterization of polyamide resins from soy-based dimer acids and different amides./. Appl. Polym. Sci. 1998, 68, 305-314. 

Chem. Descrip. Thermoplastic polyamide resin based on dimerized acid and amines CAS 25038-54-4... 

The most common application of vegetable oil-modified polyamides is in the surface coatings and paints industry. The dimer acids of tall and soybean oils and amines are used to modify the flow behaviour of paints. This thixotropic flow prevents setting and sagging, enables easy application and improves surface appearance. Vegetable oil-based nylons are used as engineering polymers in the automotive and transport industry for fuel lines. Products are also used for the extruded and moulded components of fuel systems such as filler necks, gas tanks, reservoir modules, filters, fuel rails and vapour recovery systems. Nylon 11 is also used in power coatings to coat metals that must withstand abrasion, impact and corrosion. 

A distinct set of hot-melt adhesives are designed through synthetic rather than formulation means. Thus, polyesters and polyamides are synthesized with appropriate monomers to provide the desired performance. The polyester chemistry used to make these hot-melt adhesives is the same as that used to make polyester film and fiber but the molecular weight is usually lower and the mixtures of diols and diesters are chosen to control crystallinity and flexibility. One class of monomers used to make polyamide amide hot melts is based on dimer acids that are made from natural products. 

Polyamide-modified alkyds are nsed as thixotropic agents to increase the low shear viscosity of alkyd resin based paints. Topically, abont 10% of a polyamide resin made from diamines snch as 1,2-ethanediamine (ethylenediamine) with dimer acids is reacted with an alkyd resin. High sohds thixotropic alkyds based on polyamides made with aromatic diamines have been developed, which give superior performance in high sohds alkyd coatings (36). 

Polyesters or polyamides fi om unsaturated fatty acids diamines or dimer diol-based glycols... 

Semisynthetic cellulose nitrate and the other cellulosics, polyamides derived from dimer acids, and castor-oil based polyurethanes. 

Wang W, Zhang Z, Xu M and Zhang Y. 2009. Synthesis and characterization of polyamides based on dimer acid. J Wuhan Univ Technol 24(3) 367-370. 

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