Plasticisers are also called softeners because of this, phthalates are a well known type of plasticisers.
Plasticisers are added to polymers for the manufacturing of plastics. Plasticisers are mostly used in PVC, but a significant amount of plasticisers is also used in polymers like acrylics, polypropylene or
https://www.productip.com/kb/productipedia/compliance-resources/what-are-plasticisers-(softeners)
