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Class Information
Number: 521/81
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. > Extruding a solid polymer containing material to form a cellular product > System contains a mixture of solid polymer or at least one solid polymer and at least one solid polymer-forming system
Description: Subject matter wherein a mixture of polymers or polymer-forming ingredients is employed during the extrusion step.










Patents under this class:
1 2 3 4 5 6 7 8

Patent Number Title Of Patent Date Issued
8623932 Foamed polyolefin composition Jan. 7, 2014
8557885 Extruded thermoplastic resin foam Oct. 15, 2013
8404756 Foamable fluoropolymer composition Mar. 26, 2013
8378001 Polystyrene/polyethylene oxide copolymer for enhancing water vapor permeability in thermoplastic foam Feb. 19, 2013
8349909 Polystyrene/polyethylene oxide copolymer cell size enlarger for foam Jan. 8, 2013
8324287 Positive skew styrene-acrylonitrile copolymer foam Dec. 4, 2012
8298465 Microporous film and method for producing the same Oct. 30, 2012
8283390 Siloxane block copolymer nanoporous foams, methods of manufacture thereof and articles comprising the same Oct. 9, 2012
8268904 Extruded polystyrene foam with broad comonomer content distribution Sep. 18, 2012
8153701 Extrusion of a foamable fluoropolymer Apr. 10, 2012
7977397 Polymer blends of biodegradable or bio-based and synthetic polymers and foams thereof Jul. 12, 2011
7939590 Composition for forming silica-based coating film May. 10, 2011
7919538 Styrene acrylonitrile copolymer foam with infrared attenuating agents Apr. 5, 2011
7919539 Concentrate of polyfunctional compounds usable for the preparation of foamed polyester materials Apr. 5, 2011
7799839 Porous material having hierarchical pore structure and preparation method thereof Sep. 21, 2010
7655705 Open-cell foam composed of high-melting point plastics Feb. 2, 2010
7638560 Thermoplastic and polymer foams and method of preparation thereof Dec. 29, 2009
7358282 Low-density, open-cell, soft, flexible, thermoplastic, absorbent foam and method of making foam Apr. 15, 2008
7285315 Closure in synthetic material for containers Oct. 23, 2007
7173069 Polyolefin foams and methods of making the same Feb. 6, 2007
7173070 Foam cushion and method of making and using the same Feb. 6, 2007
7166646 Asphalt-filled polymer foams Jan. 23, 2007
7160929 Nanocomposite and molecular-composite polymer foams and method for their production Jan. 9, 2007
7144925 Fire resistance acoustic foam Dec. 5, 2006
6958365 Manufacturing process for open celled microcellular foam Oct. 25, 2005
6956068 Microcellular foam dielectric for use in transmission lines Oct. 18, 2005
6908950 Asphalt filled polymer foam Jun. 21, 2005
6884823 Injection molding of polymeric material Apr. 26, 2005
6841581 Extruded styrene resin foam and process for producing the same Jan. 11, 2005
6770683 Foam comprising a blend of ethylene/styrene interpolymer and polyethylene Aug. 3, 2004
6767931 Foam compositions from blend of alkenyl aromatic polymers and alpha-olefin/vinyl or vinylidene aromatic interpolymers Jul. 27, 2004
6727291 Preparation of expandable propylene polymer beads Apr. 27, 2004
6720363 Preparation of a macrocellular acoustic foam Apr. 13, 2004
6720362 Perforated foams Apr. 13, 2004
6667350 Calcium borate infused foam building materials and the like and method of making same Dec. 23, 2003
6666998 Method and device for producing at least partially open-celled foam films from styrene polymers Dec. 23, 2003
6653360 Flexible foamed polyethylene Nov. 25, 2003
6632382 Extruded foam product with reduced surface defects Oct. 14, 2003
6613811 Microcellular thermoplastic elastomeric structures Sep. 2, 2003
6610757 Foamable vinyl chloride resin composition Aug. 26, 2003
6610755 Apparatus and process for making a corrugation-free foam Aug. 26, 2003
6602923 Process for producing alkenyl aromatic foams having increased thermal insulation using cycloalkane blowing agent and foams produced thereby Aug. 5, 2003
6596783 Process for producing foamed resin article Jul. 22, 2003
6590006 Macrocellular polyolefin foam having a high service temperature for acoustical applications Jul. 8, 2003
6586482 Uniform small cell foams and a continuous process for making same Jul. 1, 2003
6583188 Grafted thermoplastic compositions and fabricated articles therefrom Jun. 24, 2003
6573308 Biologically degradable foamed material particles Jun. 3, 2003
6559194 Polyolefin products and process additives therefor having reduced transfer to substrates May. 6, 2003
6541105 Acoustical open-cell polylefins and process for making Apr. 1, 2003
6528548 Synthetic thermoplastic resin extruded foams and methods for producing the same Mar. 4, 2003

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