Polyester polyols, in their basic form, are typically made from mixtures of diols, triols and dibasic acids or anhydrides. Polyols come in various forms dependent on the end application. These forms can include liquids at room temperature, crystalline solids, waxy solids, and solvent cut. In order to formulate these desired properties, the polyols are created using a variety of acids and diols in a range of different molecular weights.
Common polyester polyols such as polycaprolactone, polyglycolide, and polylactide are often found in biodegradable polyurethanes. Widely known applications for polyester polyols include, but are not limited to, rigid and flexible foams, surface and fabric coatings, microcellular shoe systems, moisture cured PU, industrial coatings, inks and castable elastomers.
The table below illustrates Townsend Chemicals’ Polyester Polyol Grades and their Different Applications:
|Solvent cut, branched polyester that produces coatings with excellent weathering capabilities
|Chemically resistant coatings
|Linear polyester polyol used to produce flexible coatings on its own or in combination with other RE-POL polyester polyols
|Slightly branched liquid polyester polyol for use in 2 PU coatings
|Tough PU coatings
|Branched polyester polyol, that is 100% solids and produces tough, chemically resistant coatings
|Primers and topcoats
|For the manufacture of tough, oil resistant, flexible foam
|For the manufacture of rigid foam with high mechanical properties
|For the manufacture of PIR foam where a more flexible foam is required
|PIR foam/ Spray foam
|For the manufacture of rigid foams with excellent insulation properties and flame resistance
|Liquid at room temperature polyester polyol for the manufacture of polyurethane elastomers with high mechanical properties
|Soft, waxy, 2000mW polyester polyol for the manufacture of polyurethane elastomers with high mechanical properties
|Liquid at room temperature, for use in soft printing rollers 15-45 Shore A
|Low viscosity, lightly branched polyester polyol for use in polyurethane elastomers
For additional information on Townsend Chemicals’ production of polyurethane coatings and general polyurethane production, click here!