Leverkusen, Germany - Bayer MaterialScience has further improved its patented Impact technology and is using the approach to make polyether polyols for the adhesives and sealants industry.
BMS' innovative Impact polyalkoxylation process turned a multi-stage batch process into a continuous one, with a double metal cyanide (DMC) catalyst that is 1000 times more active than the KOH one formerly used, NMS has previously said.
This allows production of polyether polyols not previously possible with conventional processes.
But now, the DMC catalyst is being used to produce high molecular weight Acclaim polyols, used in adhesives and sealants, with improved consistency and increased yields, said a 7 March Bayer statement.
BMS, in partnership with Bayer Technology Services GmbH, has built a new reactor with improved technology that it claims "significantly increases" its capacity for Acclaim polyether polyols, allowing the group "to meet customer demand in this rapidly growing market."
According to Demetri Zervoudis, head of production and technology for Polyether Polyols/Propylene Oxide with BMS' Polyurethanes Business Unit," these developments also enable us to reduce process waste and improve plant productivity, thus leading to enhanced production efficiency."
BMS said the high-molecular weight Acclaim polyols are used in high-end applications in the adhesives and sealants industry.
"The silane-terminated polyurethane prepolymers (STPs) of the Desmoseal S product range, for example, have been used successfully for many years in … elastic bonding and sealing in vehicle manufacture and shipbuilding," the group's statement said.
These STPs are also used in the construction industry, air conditioning and ventilation technology and the laying of floor coverings. Advantages of STPs include reliable adherence to many substrates, even without primers, a long service life and, "unlike silicone sealants, they exhibit excellent compatibility with coating materials."
Dr Mathias Matner of BMS' Coatings, Adhesives, Sealants unit said, "The polyurethane backbone enables the production of adhesives and sealants with both high strength and high elasticity. These are extremely stable in storage and crosslink without the need for latent hardeners even in difficult climatic conditions, leaving no air bubbles."