Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Reexamination Certificate
2007-08-20
2008-11-25
Zemel, Irina S (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
C521S058000, C521S060000, C521S146000
Reexamination Certificate
active
07456227
ABSTRACT:
Process for preparing polymer, e.g. polystyrene, particles that may not or may contain a water-retaining agent and that require only a one-step process for incorporating the water-retaining agent. The polymer particles may be prepared via an extrusion process, or a bulk polymerization process wherein a water-retaining agent is blended into the polymer melt. Water is incorporated into the particles by soaking them in hot or cold water or treating the particles with steam for a predetermined time depending on the desired water content in the particles. The water-retaining agent may be starch, zeolite, silica dioxide or poly (N-isopropyl acrylamide) ranging from 0.1% to 10.0% by weight. The particles can be expanded via appropriate means to form pre-expanded or expanded particles in a conventional manner.
REFERENCES:
patent: 2797443 (1957-07-01), Carlson, Jr.
patent: 5096931 (1992-03-01), Wittenberg et al.
patent: 6127439 (2000-10-01), Berghmans et al.
patent: 6160027 (2000-12-01), Crevecoeur et al.
patent: 6166099 (2000-12-01), Krupinski
patent: 6242540 (2001-06-01), Crevecoeur et al.
patent: 6274641 (2001-08-01), Krupinski
patent: 6342540 (2002-01-01), Gluck et al.
patent: 6387968 (2002-05-01), Gluck et al.
patent: 6398997 (2002-06-01), Ligon et al.
patent: 6420444 (2002-07-01), Krupinski
patent: 6433092 (2002-08-01), Krupinski et al.
patent: 6476149 (2002-11-01), Krupinski
patent: 6528570 (2003-03-01), Berghmans et al.
patent: 6608141 (2003-08-01), Krupinski et al.
patent: 1106143 (1968-03-01), None
patent: 59-109532 (1984-06-01), None
patent: 6-262071 (1993-09-01), None
Berghmans Hugo A. A.
Berghmans Michel F. J.
Bleijenberg Karel Cornelis
Kikel Suzanne
Matz Gary F.
NOVA Chemicals Inc.
Zemel Irina S
LandOfFree
Polymer particles and related articles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polymer particles and related articles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polymer particles and related articles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4045414