Suspension-polymerization process for producing expandable styre

Details Suspension-polymerization process for producing expandable styre Suspension-polymerization process for producing expandable styre

1996-05-03

1998-04-14

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 78, 526213, 526216, 526207, 526234, 526237, 526346, 521 72, 521 82, 521 94, 521 97, 521 98, 521 99, 521128, 521130, 521131, 521133, 521146, C08F 218, C08F 1208, C08J 916, C08J 920

Patent

active

057392218

ABSTRACT:
Expandable styrene resin beads are described, which, when expanded to a bulk density of 20 g/l, give pre-expanded beads in which the number of cells present along those surface parts of radii which range from the bead surface to a depth of 0.2 mm from the surface is from 3 to 20 per mm and to the bead center is 10 or larger per mm, the number of the number of cells present along those inner parts of the radii which range from a depth of 1 mm from the bead surface to the bead center is 10 or larger per mm, the number of cells present along said surface parts being smaller than the number of cells present along said inner parts.

REFERENCES:
patent: 3198775 (1965-08-01), Delacretaz et al.
patent: 3389097 (1968-06-01), Ingram et al.
patent: 3647723 (1972-03-01), Mysik et al.
patent: 5229429 (1993-07-01), Hahn et al.

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