Use of a polypropylene based composition for expanded beads

Details Use of a polypropylene based composition for expanded beads Use of a polypropylene based composition for expanded beads

2005-08-16

2005-08-16

Seidleck, James J. (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S134000, C525S191000, C525S240000

Reexamination Certificate

active

06930132

ABSTRACT:
Use of a polypropylene based composition (C) comprising (a) from 5 to 95% by weight of a random copolymer of propylene (A) containing from 0.5 to 12 mole % of at least one comonomer chosen from ethylene and/or an alpha-olefin containing from 4 to 6 carbon atoms, and having an MFIAin the range from 0.01 to 5 g/10 min, (b) from 95 to 5% by weight of a random copolymer of propylene (B) containing from 0.5 to 12 mole % of at least one comonomer chosen from ethylene and/or an alpha-olefin containing from 4 to 6 carbon atoms, and having an MFIBin the range from 15 to 1000 g/10 min, said composition (C) being such that random copolymers (A) and (B) contain the same comonomer(s) and have, for each comonomer, substantially the same comonomer content, for the manufacturing of expanded beads.

REFERENCES:
patent: 6040348 (2000-03-01), Delaite et al.
T. Whelan, Polymer Technology Dictionary, Chapman & Hall, London, 1994, p. 334.

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