Process for making ethylenic polymer foam structures

Details Process for making ethylenic polymer foam structures Process for making ethylenic polymer foam structures

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) C08J 9/18 (2006.01)

Patent

CA 2153902

Disclosed is an ethylenic polymer foam structure comprising an ethylenic polymer material. The ethylenic polymer material contains a substantially linear ethylenic polymer having: a) a melt flow ratio, l 10/12 >= 5.63; b) a molecular weight distribution, M w/M w, defined by the equation M w/M n <= (1 10/1 2)-4.63; and c) a critical shear rate at onset of surface melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a linear olefin polymer having about the same 1 2 and M W/M n. The foam structures have toughness and elasticity similar to those formed from conventional LLDPE without the poor dimensional stability and foam quality associated with those structures. The foam structures have foam quality similar to those made with conventional LDPE but with enhanced toughness and elasticity. Further disclosed is a process for making the above foam structure and malting it in a foam bead form. Further disclosed is a process for making an article of the foam beads.

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