An additive for improving the processing characteristics of polyolefin comprising metal salt(s) of fatty acyl a-hydroxy carboxylic acid, compound of formula 1, Compound of formula 1 wherein RCO is the acyl radical of a saturated fatty acid comprising 16 to 22 carbon atoms, n is the average no of a-hydroxy propa...

A thermoplastic elastomer comprising 0.1 to 0.5% of a glycerol derivative, compound of formula I or polyglycerol, compound of formula II, wherein R1, R2 and R3 represent each a fatty acyl group, said fatty acyl group comprises at least 12 carbon atoms.