To obtain the subject composition which can be added to polymer, extruded by a simple method after the addition and contains no carrier at all, by including an organic polymer material and a stabilizer mixture.

This composition comprises (A) an organic polymer material and (B) a stabilizer mixture consisting of (i) α-tocopherol, (ii) a solid polyhydroxy compound selected from the group consisting of triglycerol, dihydromethylolpropane, dipentaerythritol, tripentaerythritol, D-mannitol, D- sorbitol and xylitol (or) (iii) an acid binder or a mixture of the components (ii) and component (iii). Preferably the component A is a polyolefin, the component (iii) is ditrimethylolpropane, etc., and the component (iii) is a 3-18C carboxylic acid alkaline earth salt.