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Class Information
Number: 521/60
Name: Synthetic resins or natural rubbers -- part of the class 520 series > Synthetic resins (class 520, subclass 1) > Cellular products or processes of preparing a cellular product, e.g., foams, pores, channels, etc. > Particle which is expandible, process of preparing an expandible particle, or process of expanding a particle to form a cellular product > Adding expanding agent subsequent to solid polymer formation
Description: Subject matter wherein the expanding agent is added to a previously formed solid polymer, e.g., impregnating a particle with a blowing agent, etc.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8598241 Polypropylene resin pre-foamed particle and method for producing same, and polypropylene resin in-mold foaming molded article Dec. 3, 2013
8598242 Expanded polypropylene copolymer resin particles Dec. 3, 2013
8592494 Styrene-modified linear low-density polyethylene-based resin beads, styrene-modified linear low-density polyethylene-based expandable resin beads, production method therefor, pre-expanded bead Nov. 26, 2013
8592495 Thermoplastic resin composite bead production method, expandable thermoplastic resin composite bead, expanded thermoplastic resin composite bead, and foamed molded article formed from expanded Nov. 26, 2013
8518540 Expanded polypropylene resin beads and expanded bead molding Aug. 27, 2013
8513317 Process for producing expanded polyolefin resin particles and expanded polyolefin resin particles Aug. 20, 2013
8501827 Methods for using hollow sphere polymers Aug. 6, 2013
8476325 Styrene-modified polyethylene-based resin beads, styrene-modified polyethylene-based expandable resin beads, production method therefor, pre-expanded beads and expanded molded article Jul. 2, 2013
8455559 Preparing expandable styrene polymers Jun. 4, 2013
8455560 Foam layer produced of a biodegradable polyester mixture Jun. 4, 2013
8324286 Heat-expandable microspheres, method for producing the same, and application thereof Dec. 4, 2012
8283389 Methods of manufacture of polylactic acid foams Oct. 9, 2012
8282851 Anisotropic cellular elastomers Oct. 9, 2012
8268902 Composite material based on vinylaromatic polymers having enhanced thermal insulation properties and process for the preparation thereof Sep. 18, 2012
8252715 Water-absorbing agent and production method thereof Aug. 28, 2012
8236431 Hollow organic pigment core binder coated paper and paperboard articles and methods for making the same Aug. 7, 2012
8222307 Flameproof expandable styrene polymers, and method for the production thereof Jul. 17, 2012
8198340 Quality polymer foam from fluorinated alkene blowing agents Jun. 12, 2012
8173714 Expanded styrene polymers having a reduced thermal conductivity May. 8, 2012
8142695 Foam of polymers Mar. 27, 2012
8088482 Expandable microspheres for foam insulation and methods Jan. 3, 2012
8084509 Pre-expanded particulate polypropylene-based resin and in-mold expansion molded article Dec. 27, 2011
8063177 Pre-expanded polypropylene resin particle, and method for production thereof Nov. 22, 2011
8058320 Thermally foamable microsphere, production method thereof, use thereof, composition containing the same, and article Nov. 15, 2011
8026291 Expanded and extruded polyolefin foams made with methyl formate-based blowing agents Sep. 27, 2011
8013031 Extruded polylactide foams blown with carbon dioxide Sep. 6, 2011
7964652 Expandable polyethylene resin particle and method for production thereof Jun. 21, 2011
7943676 Method of recycling waste plastic foam materials May. 17, 2011
7868053 Expandable polystyrene granulates with a bi- or multi-modal molecular-weight distribution Jan. 11, 2011
7863343 Expandable polylactic acid resin particles, expanded polylactic acid resin beads and molded article obtained from expanded polylactic acid resin beads Jan. 4, 2011
7863342 Fire resistant materials Jan. 4, 2011
7846987 Expanded and extruded biodegradable and reduced emission foams made with methyl formate-based blowing agents Dec. 7, 2010
7838108 Nano-cellular polymer foam and methods for making them Nov. 23, 2010
7803849 Acrylic resin expanded beads, acrylic resin expandable beads, and method for manufacturing foamed molded article of acrylic resin expanded beads Sep. 28, 2010
7772294 Fire resistant materials Aug. 10, 2010
7770691 Lightweight pelletized materials Aug. 10, 2010
7767724 Expandable resin beads of styrene-modified straight-chain and low-density polyethylene, process for production thereof, pre-expand beads, and foams Aug. 3, 2010
7767723 Expandable resin particles of styrene-modified straight-chain and low-density polyethylenne, process the production thereof, pre-expanded particles, and foams Aug. 3, 2010
7745504 Process for producing porous spherical polyamide particle Jun. 29, 2010
7741378 Porous monodispersed particles and method for production thereof, and use thereof Jun. 22, 2010
7700023 Method for producing an environment protective foamed thermoplastic resin polymer Apr. 20, 2010
7683101 Pre-expanded particle of olefin-modified polystyrene resin, process for producing the same, and molded foam Mar. 23, 2010
7662866 Polymeric support having novel pore structures Feb. 16, 2010
7579384 Expanded molded article having voids Aug. 25, 2009
7550521 Toughening of thermosets Jun. 23, 2009
7456227 Polymer particles and related articles Nov. 25, 2008
7358280 Process for processing expandable polymer particles and foam article thereof Apr. 15, 2008
7241816 Expandable styrene resin particles, expandable beads, and foamed article Jul. 10, 2007
7192989 Method and expansion device for preparing expanded thermoplastic microspheres Mar. 20, 2007
7175728 Heat-peelable adhesive sheet Feb. 13, 2007

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