EXTRUDED NONCROSSLINKED FOAMS MADE FROM ETHYLENE-STYRENE INTERPOLYMERS

摘要

Ethylene-styrene Interpolymers (ESI) are a new class of polymers made by copolymerisation of ethylene and styrene monomers using INSITE* Technology. The trademark is INDEX* Interpolymers. The properties of Interpolymers vary significantly with copolymer styrene content. The glass transition temperatures of Interpolymers of current interest range from about -20℃ to about +35℃. Interpolymers with up to about 45 wt% copolymer styrene are semicrystalline and exhibit good low temperature toughness. Interpolymers with greater than about 45 wt% copolymer styrene are amorphous and range from those that are highly elastic (i.e., low modulus and high elongation) to those that have higher modulus with unique stress relaxation and deadfold properties. This paper describes the novel and unique foams made by expanding either Interpolymers or blends of Interpolymers with polyethylene, polypropylene and polystyrene using physical blowing agents.