Elongated polypropylene resin film

Abstract

Abstract PURPOSE: To provide the subject film improved in smoothness and blocking resistance without impairing tenacity and transparency of the film by subjecting a PP composition blended with bridged high-molecular pulverulent bodies having a specific grain size and no melting point to melt extrusion and then to cooling and elongation. CONSTITUTION: A PP composition prepared by blending (ii) 0.02W0.8pt.wt. of high- molecular pulverulent bodies having a particle size of 3W40μ and a bridge structure and further having no melting point, and (iii) a charge preventing agent, and (iv) a lubricant, as necessary, with (i) 100pts.wt. of PP, is subjected to melt extrusion by an ordinary process, and then to cooling, and elongating the composition at least in a uniaxial direction to obtain a PP film. As components (ii), those obtained by bridging pulverulent bodies obtained by pulverizing a polymer obtained by (a) bulk polymerization, suspension polymerization or the like by radiant rays, and the like, and by (b) pulverizing a thermosetting resin. EFFECT: Upon elongating the film, formation of voids is reduced, and cracking of the film is reduced in the elongation step. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Shigeru Kondo

Bibliographic Details