From Price hikes bring resin buyers a less than happy new year in January (Plastics News):

“North American polypropylene prices surged an average of 13 cents per pound in January, after jumping 14 cents in December. That two-month total of 27 cents in increases has led some processors to issue price surcharges on PP-finished products.
“Regional polyethylene prices moved up an average of 5 cents per pound in January after also moving up by 5 in December. The surprising hikes were caused by strong demand — especially in products sold to grocery stores — and unplanned outages at some production sites, according to RTI PE market analyst Mike Burns.”