| 摘要 |
PROBLEM TO BE SOLVED: To obtain an outer lubricant having a more excellent slipping effect than those of conventional lubricants and having excellent safety because a polyglycerol fatty acid ester is a food additive, by using the polyglycerol fatty acid ester. SOLUTION: This outer lubricant contains a polyglycerol fatty acid ester (hereinafter referred to as ester). It is preferable that the polyglycerol constituting the ester contains a polyglycerol selected from tri, tetra, penta, hexa, hepta, octa, nona and decaglycerols in an amount of >=35%. The fatty acid is preferably a 12-18C fatty acid. Pentaglyceryl laurate, pentaglyceryl stearate, or the like, are preferable among the esters synthesized from the raw materials. The acid value and HLB of the ester are preferably <=5 and 10-18, respectively. Thermoplastic resins to be mixed with the objective outer lubricant preferably include low density and high density polyethylenes, polypropylene and polystyrene. |
