Polysebacate Polyols
Properties and Applications
Polysebacates are aliphatic, medium to high molecular weight polyesters formed from polyalcohols and sebacic acid. These linear or lightly branched polyester polyols have a low melting and glass transition temperature, high resistance to solvents and flames, but poor hydrolytic stability. They are mainly used as high-molecular-weight plasticizers and as prepolymer reactants in the synthesis of polyurethanes. When added to or copolymerized with thermoplastics such as PVC, they impart flexibility, reduce melt viscosity, and lower the elastic modulus and glass transition temperature. They also improve resistance to abrasion of thermoplastic PUs (TPUs) in coating and footwear applications.
Polysebacates are compatible with many plastics and rubbers, including PU, PVC, NR, NBR, NC, and PVA. They are chosen over low MW plasticizers when very low plasticizer migration and/or extended product durability is required. They also provide superior retention of physical properties after prolonged service at elevated temperatures. However, plasticization is typically more difficult and more time consuming and results in increased processing cost.