New PolyPropylene additive for thermoforming applications for cleaner chemistry

Source: Milliken Chemistry

It is newly designed for performance by thermoformers. Milliken & Company’s Chemical Division’s most advanced high-performance additive for polypropylene (PP) homopolymers gives excellent stability of physical properties superb aesthetics—all qualified through cleaner chemistry.

Hyperform® HPN® 909ei marks all those boxes, and more, as this formulation also approaches a vital aspect for safety reassurance in the EU. Tailored significantly to reduce migration, especially in food-contact applications, this new grade of Hyperform has one Specific Migration Limit (SML) less than the creative product. 

A lower number of SMLs suggests that one less substance must be observed and examined for, reducing the client’s compliance burden. With this simplification, the reassurance of safety is indeed more substantial. This is necessary, given that this type of PP homopolymer is typically used for thermoforming drink containers and lids, food packaging, and trays.

Conventional nucleating agents need the user to sacrifice impact to gain greater stiffness. Hyperform HPN 909ei, however, gives improved stiffness (flexural modulus) while supporting the impact performance. It also contributes isotropic shrinkage (similar shrinkage in both directions, thereby reducing warpage) and a higher heat deflection temperature, which allows improved heat resistance vital for hot-fill and microwaveable applications. It also serves to override the nucleation effects of pigments, thereby reducing design complexity.

Hyperform HPN 909ei achieves all this without sacrificing aesthetics. “In fact,” notes Bhavesh Gandhi, global product line manager for Milliken’s Chemical Division, “it yields products with excellent optical properties, including lower haze, reduced yellowing, and an overall cleaner look. This can further enhance sustainability,” he says, “by allowing end-users to replace other resins in various applications with highly recyclable polypropylene, with its low overall carbon footprint.”

With its growing range of Hyperform HPN high-performance additives, Milliken continues to help converters improve their processing and enhance their final PP parts’ performance.

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