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Additives, impact modifiers, masterbatch, molding and film processing, defects, PCE synthesis and formulation.
Polypropylene molds on a standard screw injection machine, with no drying for unfilled grades, at a melt temperature that producers put between about 200 °C and 260 °C, into a cool mold, with a fast fill and enough pack and…
A PP COA might list “1500 ppm phenolic AO + 1000 ppm phosphite + 500 ppm slip” and look like a complete additive package. Whether those numbers are correct depends on whether the grade is heading into a hot-water pipe,…
A PP part that has to be seen through needs a clarifier; a part that only has to be stiffer, hold its shape hotter or leave the mould sooner needs a stiffness nucleating agent, which doses lower and puts no…
A nucleating agent is an additive that gives a molten semicrystalline polymer a ready-made surface to start crystallizing on, so the melt solidifies at a higher temperature and the part sets as a dense population of small crystals instead of…
Two PP compounds at identical 20 wt% elastomer loading can land on opposite sides of a cold-impact specification. One fractures at 0 °C with zero ductile failure. The other absorbs 23 kJ/m² and stays ductile past 60% of its cross-section.…
A carrier resin is the polymer a pigment or additive is compounded into so it can be dosed as a pellet — the base polymer of a masterbatch. Here “resin” means a thermoplastic pellet, so this is a different thing…
_Why side-chain length influences far more than slump retention_ Few structural variables get as much attention from formulation engineers as the length of the polyether side chain. The same question comes up in research laboratories, polymer production facilities, and technical…
Two observations make a processor certain the new lot is at fault: the gels started when the lot started, and they sit everywhere across the web instead of in a line. That is also what a new resin looks like…
_Industrial scale-up as an engineering discipline_ A successful laboratory formulation often creates a sense of confidence. The polymer exhibits excellent molecular characteristics. Water reduction exceeds expectations. Slump retention satisfies the original design objectives. Repeat laboratory batches produce encouraging results. At…