公开(公告)号：US3351569A

公开(公告)日：1967-11-07

申请号：US24149862

申请日：1962-12-03

Applicant: STAMICARBON

Inventor： REVALLIER LEONARDUS J ,  DE BOOIJS COENRAAD L ,  CORNELIS VERWEEL

IPC: C08J9/00 ,  C08J9/14 ,  C08J9/18

CPC classification number: C08J9/0095 ,  C08J9/0066 ,  C08J9/14 ,  C08J9/18 ,  C08J2323/00 ,  C08J2323/02 ,  C08K3/22 ,  C08K7/22 ,  C08L23/02 ,  C08L23/04 ,  C08L23/10 ,  C08L91/06 ,  Y10S264/13 ,  Y10S521/908

Abstract: A process for the preparation of a product expandable to form a foamed plastic comprises mixing a polymer of ethylene or propylene with at least 10% by weight based on the polymer of a finely-divided inorganic solid, and contacting in the solid state with a liquid organic blowing agent. The finely divided inorganic solid may be: "Aerosil" (Registered Trade Mark), SiO2, per lite, kaolin, asbestos powder, silicates, chalk or MgO. The liquid organic blowing agent may be a hydrocarbon, halogenated alkane, methanol, acetone and low-boiling esters. Wax having a melting-point at least 10 DEG C. higher than the polymer may be present in the mixture. In a typical Example (1) high pressure polyethylene, MgO and wax were mixed at 115 DEG C. and the mixture immersed in n-pentane, separated from the liquid and the mixture extruded at 80-110 DEG C. to produce a fine cellular product.