Priplast 3190 Dimer acid-based polyester polyol Uniqema PU - Polyols >> Polyester ADHESIVE >> Hot-melt ADHESIVE >> Solvent based ADHESIVE >> Water-based SEALANT Priplast dimer acid-based polyester polyols Resistance to hydrolytic attack by moisture, alkali or acid Resistance to radical-type attack via heat, oxygen, UV or chlorine Adhesion to low-energy surfaces Excellent flow properties with efficient substrate wetting Flexibility with good impact strength Uniqema’s process knowledge allows tight control of production to give a wide range of Priplast polyester polyols with varying properties and applications (See Table 1). Resistance to hydrolytic attack Hydrolytic stability is a weakness of most well known polyesters used in the polyurethane industry, e.g. adipate esters and polycaprolacton. The use of dimerised fatty acids to build the polyester diols at the heart of the Priplast system gives a very hydrophobic environment with a low level of vulnerable ester bonds. This chemistry leads to excellent hydrolytic stability that brings with it resistance against attack by acids, alkali and alcohol in addition to excellent thermal stability. These superior performance characteristics are demonstrated in Figure 1. The Priplast formulations are clearly more stable than thermoplastic polyurethane samples made with ethylene glycol or butane diol adipate after prolonged exposure to heat, alkali, acid and alcohol. Priplast also gives superior resistance to oxidation, ultraviolet degradation and chlorine compared to polyethers such as PPG and PTMEG. Adhesives Heat & moisture resistance The introduction of new heat and moisture resistance performance standards for adhesives, for example the “Jungle test”, in automotive and footwear applications, fit well with the enhanced properties offered by Priplast formulations described previously. These characteristics also suit the material for use in sealant and encapsulant applications in industries such as electronics. Adhesion to non-polar substrates A particular benefit for adhesive formulation is the ability of Priplast to adhere to non-polar, low energy substrates such as polyolefins. These cheaper materials are increasingly popular but pose substantial problems with adhesion. The superior adhesion of Priplast formulations to untreated high-density polyethylene is demonstrated in Figure 3 in comparison to adipate or polyether based adhesives. The good flow and flexibility properties of the dimerate polyols lead to good wetting characteristics and efficient coverage of the substrate – another key benefit in adhesive applications. Successful formulation of Priplast dimerate polyols has been demonstrated in polyurethane hot melt adhesives, aqueous dispersion adhesives, solvent-borne adhesives and radiation curable adhesives. Priplast 3190 very low glass transition temp., hydrolytic/thermal/oxidative stability elastomers with low – temperature impact needs, elastic coatings, primers, sealants PRIPLAST - C36 dimer based polyester polyols These materials offer a unique combination of resistance to hydrolytic attack by moisture, alkali and acid with resistance to UV, oxidative and temperature degradation for applications in polyurethane coating resins, adhesive resins, elastomers and water-repellent PU foams. Uniqema is an established supplier to the manufacturers and formulators of adhesive resins. When incorporated into an adhesive, dimerised fatty acids offer the following benefits: better adhesion better bond stability better durability Better adhesion is achieved by the improved flow behaviour between the adhesive brought by dimer. As a result, the contact between surface and adhesive is optimum. Better bond stability is brought by the flexibility that comes with the dimer building block. This allows absorption of mechanical stress, even at very low temperatures. Durability of the adhesive bond is improved by dimer’s intrinsic water repellancy, and its inertness towards oxygen and heat. Uniqema’s PRIPOL C36 dimer fatty acids are widely used in polyamide hotmelt adhesives. Conventional polyamides tend to have too high a melting point to be of practical value as hotmelt adhesives. The incorporation of PRIPOL dimer acid allows the synthesis of polyamides within a practicable range of melting points. As a consequence, the inherent benefits of polyamide (strength and a narrow melting range) can be fully exploited. Other adhesive applications are to be found in two component epoxy resin systems. More information can be found in Uniqema’s brochure “Products for epoxy resin hardeners and epoxy resin modification”. In polyester hotmelts dimer acid provides flow properties, flexibility and hydrolytic stability as it does for polyamides. The suggested building block for this application is PRIPOL 2033, which is a dimer diol. A fourth adhesive technology that can benefit from applying PRIPOL dimer acids is that of the rapidly growing category of polyurethane adhesives (either hotmelt, dispersion type, or solution type). Inclusion of dimer acid derived building blocks bring performance that is not achievable with conven-tional adipate type polyesters, notably in areas such as: hydrolytic stability glass transition temperature flow properties Dimer acid-based polyester polyol. Used as a building block and as a modifier for polyamides, two component epoxy resin systems, polyesters hot melt adhesives, and for hotmelt, solution and dispersion polyurethane adhesives, and in sealants. Provides resistance to hydrolytic attack by moisture, alkali or acid, to radical-type attack via heat, oxygen, UV or chlorine,. Offers adhesion to non-polar, low energy substrates such as polyolefins, very good flow properties, efficient substrate wetting, flexibility, and good impact strength. Offers very low glass transition temperature. Gives adhesion, bond stability and durability.