The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 1998
Filed:
May. 03, 1996
Applicant:
Inventors:
Assignee:
Mitsubishi Chemical BASF Company Limited, Yokkaichi, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ; C08J / ; C08J / ;
U.S. Cl.
CPC ...
526 81 ; 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 ;
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.