Caprolactone derivatives for themoplastic polyurethane elastomers bridge the gap between polyesters and polyethers, Jane Denny investigates
“If you ever break your hand and need to go to hospital,” says Stephen Lewis, Perstorp’s vp of the caprolactones Capa business unit, “it’s likely you will have a Capa thermoplastic splint fitted to protect the injury from further damage and aid the re-alignment of the tissue.”
This particular use is just one of many application areas and demonstrates some of the properties that Capa Thermoplastics brings to their related polyols, said Stephen Lewis at Perstorp. The homopolymer melts at 60ºC, forms a rigid material at room temperatures.
Capa polyols are aliphatic polyesters made by a ring opening reaction, which Perstorp says give a controlled polydispersivity, very low acid values. There are two series of polyols in the Capa range
The Capa 2 series has a functionality of two and grades are available with molecular weights between 400 and 8000. Capa 3 series materials are tri-functional polyols with molecular weights from 300 to 3000.
Perstorp’s Warrington, UK plant
Perstorp’s entire capalactones capacity is produced at its plant in Warrington, UK – situated almost at the mid-point between Manchester and Liverpool in the north of England.
The plant is…