US company Crompton recently introduced a new chemical structure of PP (polypropylene) nucleating agent with brightener Mold-pro 931 o Molpro931 is gray sheet material, in the amount of PP is 0.10% to 0.25%, plus gas phase PP The haze value is 39%} 55%, which is superior to the benzoate transparent agent (haze value of 63%). This is a melt-mixable additive that costs a lot more than melt-blend sorbitol (DBS) type clearers or non-meltable organic phosphate vinegars. The company stated that the price of Moldpro 931 is $5 per pound (0.454 kg), while the price of other nucleating agents is $1220 per 0.454 kg.
The product has been approved by the U.S. Food and Drug Administration. It crystallizes PP at 129°C, which is comparable to DBS products and even better. It also shortens the molding cycle and improves product rigidity.
Information Source: Plastic Packaging