Speciality chemicals producer Emerald Kalama Chemical, a division of US-based Emerald Performance Materials (Cuyahoga Falls, Ohio; www.emeraldmaterials.com), has launched a non-phthalate plasticiser for use in polysulphide sealants. Emerald said “Vitroflex” B, which is based on polymeric technology, has been tailored for use in environmentally friendly polysulphide sealants and provides formulators with a safer alternative to conventional plasticisers, such as benzyl phthalates and chlorinated paraffins, which are increasingly subject to regulation and restrictions.

Short-chain chlorinated paraffins have been classified as probable human carcinogens and persistent, bioaccumulative and toxic substances. Several countries are also scrutinising medium-chain length varieties on concerns about potential bioaccumulation in adipose tissue and persistence in the environment.

Specifically, Vitroflex B has been optimised to enhance performance characteristics in the “B” (catalyst) side of two-component polysulphide sealants. These sealants are widely used in construction and transportation applications, especially insulated glass window seals. Emerald said the plasticiser enhances many critical performance characteristics, offering faster hardness development and better lap shear strength along with excellent flexibility, adhesion and elongation.

Global business development director Julie Vaughn said that polymeric chemistry offered a significant growth opportunity for Emerald. She said polymerics are a new technology for the company and “the platform will serve as a springboard to new applications and technologies in high-opportunity areas, such as vinyl, adhesives, sealants, coatings and films.”