Expandable vinylaromatic polymers and process for their...

Details Expandable vinylaromatic polymers and process for their... Expandable vinylaromatic polymers and process for their...

2004-03-11

2009-11-03

Teskin, Fred M (Department: 1796)

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

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S057000, C521S080000, C521S146000, C521S147000, C521S148000, C524S496000, C524S855000

Reexamination Certificate

active

07612119

ABSTRACT:
Expandable vinylaromatic polymers which comprise: a) a matrix obtained by polymerizing 50-100% by weight of one or more vinylaromatic monomers and 0-50% by weight of a copolymerizable monomer; b) 1-10% by weight, calculated with respect to the polymer (a) of an expanding agent englobed in the polymeric matrix; c) 0.01-20% by weight, calculated with respect to the polymer (a) of carbon black distributed in the polymeric matrix having an average diameter ranging from 30 to 2000 nm, a surface area ranging from 5 to 40 m2/g, a sulfur content ranging from 0.1 to 2000 ppm and an ash content ranging from 0.001 to 1%.

REFERENCES:
patent: 3354243 (1967-11-01), Dodge
patent: 5210105 (1993-05-01), Paquet et al.
patent: 5352289 (1994-10-01), Weaver et al.
patent: 7279504 (2007-10-01), Ghidoni et al.
patent: 0 372 343 (1990-06-01), None

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