초록 ▼

A process for producing a foamed and molded article of a polypropylene resin, which comprises pressurizing preliminarily-foamed particles of an ethylene/propylene copolymer having a melt index value of from 0.1 to 25, a latent heat of crystallization of not more than 28 cal/g and an ethylene content

A process for producing a foamed and molded article of a polypropylene resin, which comprises pressurizing preliminarily-foamed particles of an ethylene/propylene copolymer having a melt index value of from 0.1 to 25, a latent heat of crystallization of not more than 28 cal/g and an ethylene content of from 1 to 30% by weight as a base resin with an inorganic gas or a gaseous mixture of the inorganic gas and a volatile blowing agent thereby to impart an elevated pressure to the inside of said particles, thereafter filling said particles in a mold capable of enclosing the particles but allowing escape of gases therefrom, and then heating said particles to expand them to the configuration of the mold.

대표청구항 ▼

A process for producing a foamed and molded article of a polypropylene resin, which comprises pressurizing preliminarily-foamed particles of a non-crosslinked ethylene/propylene copolymer having a melt index value of from 0.1 to 25, a latent heat of crystallization of not more than 28 cal/g and an e

A process for producing a foamed and molded article of a polypropylene resin, which comprises pressurizing preliminarily-foamed particles of a non-crosslinked ethylene/propylene copolymer having a melt index value of from 0.1 to 25, a latent heat of crystallization of not more than 28 cal/g and an ethylene content of from 1 to 30% by weight as a base resin with an inorganic gas or a gaseous mixture of the inorganic gas and a volatile blowing agent whereby the inorganic gas or the gaseous mixture penetrates into said particles and impart an elevated pressure in the range of 0.5 to 5 kg/cm2(G) to the inside of said particles, thereafter filling said particles in a perforated mold capable of enclosing the particles but allowing escape of gases therefrom, and then heating said particles with steam to expand them to the configuration of the mold.