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Styrenic Block Copolymers for Copolyester Modification
Marcus Greger, Ph.D., Kraton Polymers Research B.V., Amsterdam, The Netherlands
The newest hydrogenated styrenic block copolymer of the Kraton® A family, MD6951, was evaluated in a concept study to modify Co-Polyesters with focus on lower shore hardness and higher melt flow. Application of COPE is limited when low hardness (< 22 Shore D) is required. Commercially lower hardness and higher melt flow within COPE-blends can be achieved by adding oil into these type of compounds. However, this is not always desired depending on the application and can have a significant influence on other properties. The objective of this evaluation is to study COPE hardness (approx. 65 Shore A) and melt flow modification (approx. MFR 40 at 230°C/2.16kg) using styrenic block copolymers without adding oil as plasticizer. Furthermore the haptic properties and coefficient of friction can be adjusted with the use of additives if necessary.