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Class Information
Number: 521/79
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
Description: Subject matter drawn to processes of cell formation wherein said cell formation is achieved or initiated by a step of extrusion of a molten or liquid material from a region of high pressure through an orifice into a region of lower pressure.

Sub-classes under this class:

Class Number Class Name Patents
521/80 Including solid polymer formation in or during extruding step 50
521/81 System contains a mixture of solid polymer or at least one solid polymer and at least one solid polymer-forming system 390

Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Patent Number Title Of Patent Date Issued
8691896 Halogen-free, phosphorus-containing flame-retardant polymer foams Apr. 8, 2014
8598244 Reduced-VOC and non-VOC blowing agents for making expanded and extruded thermoplastic foams Dec. 3, 2013
8568632 Method of forming thermoplastic foams using nano-particles to control cell morphology Oct. 29, 2013
8557884 To enhance the thermal insulation of polymeric foam by reducing cell anisotropic ratio and the method for production thereof Oct. 15, 2013
8557885 Extruded thermoplastic resin foam Oct. 15, 2013
8546458 Process for texturing materials Oct. 1, 2013
8536241 (Meth)acryloyl pressure-sensitive foam adhesives Sep. 17, 2013
8476327 Extruded polymer foam process with staged forming Jul. 2, 2013
8455560 Foam layer produced of a biodegradable polyester mixture Jun. 4, 2013
8450383 Extruded polymer foams containing esters of a sugar and a brominated fatty acid as a flame retardant additive May. 28, 2013
8440732 Polymeric foams with nanocellular morphology and methods for making them May. 14, 2013
8404756 Foamable fluoropolymer composition Mar. 26, 2013
8398904 Microcellular foam of thermoplastic resin prepared with die having improved cooling property and method for preparing the same Mar. 19, 2013
8354461 Foamable fluoropolymer composition Jan. 15, 2013
8323547 Microporous polyethylene film manufactured according to liquid-liquid phase separation and method of producing the same Dec. 4, 2012
8323787 Additive blend for enhancing water vapor permeability and increasing cell size in thermoplastic foams Dec. 4, 2012
8324287 Positive skew styrene-acrylonitrile copolymer foam Dec. 4, 2012
8324288 Extruded polymer foams containing brominated fatty acid-based flame retardant additives Dec. 4, 2012
8318819 Compositions for compounding foamable, fluropolymer pellets for use in melt processing cellular or foamed fluoropolymer applications Nov. 27, 2012
8309619 Reduced-VOC and non-VOC blowing agents for making expanded and extruded thermoplastic foams Nov. 13, 2012
8298465 Microporous film and method for producing the same Oct. 30, 2012
8277719 Process for the preparation of auxetic foams Oct. 2, 2012
8278366 Compositions for compounding, extrusion and melt processing of foamable and cellular fluoropolymers Oct. 2, 2012
8268902 Composite material based on vinylaromatic polymers having enhanced thermal insulation properties and process for the preparation thereof Sep. 18, 2012
8222307 Flameproof expandable styrene polymers, and method for the production thereof Jul. 17, 2012
8222310 Extruded polypropylene resin foam and process for producing the same 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
8153701 Extrusion of a foamable fluoropolymer Apr. 10, 2012
8137600 Injection molding of polymeric material Mar. 20, 2012
8119701 Method of manufacturing polystyrene foam with polymer processing additives Feb. 21, 2012
8101671 Polyolefin resin foam and the process for producing the same Jan. 24, 2012
8080592 Extruded polymer foams containing brominated fatty acid-based flame retardant additives Dec. 20, 2011
8058332 Phosphorus-sulfur FR additives and polymer systems containing same Nov. 15, 2011
8013031 Extruded polylactide foams blown with carbon dioxide Sep. 6, 2011
7977396 Impact-absorbing members for dynamic impact applications Jul. 12, 2011
7977397 Polymer blends of biodegradable or bio-based and synthetic polymers and foams thereof Jul. 12, 2011
7968613 Compositions for compounding, extrusion and melt processing of foamable and cellular fluoropolymers Jun. 28, 2011
7960443 Extruded styrenic resin foam and method for producing the same Jun. 14, 2011
7919541 Method of manufacturing flame-retardant polymer foam comprising a phosphorous flame retardant and flame-retardant foam produced thereby Apr. 5, 2011
7919538 Styrene acrylonitrile copolymer foam with infrared attenuating agents Apr. 5, 2011
7901764 Multi-layered polylactic acid resin foamed body and multi-layered polylactic acid resin foamed molded article Mar. 8, 2011
7868053 Expandable polystyrene granulates with a bi- or multi-modal molecular-weight distribution Jan. 11, 2011
7855239 Extruded propylene resin foam Dec. 21, 2010
7846987 Expanded and extruded biodegradable and reduced emission foams made with methyl formate-based blowing agents Dec. 7, 2010
7815825 Microporous polyolefin membrane, and method of producing the same Oct. 19, 2010
7799841 Polypropylene foam Sep. 21, 2010
7799839 Porous material having hierarchical pore structure and preparation method thereof Sep. 21, 2010
7759404 Inherently open-celled polypropylene foam with large cell size Jul. 20, 2010
7740953 Skin system with elastic components having differing hardnesses for use with robotics Jun. 22, 2010

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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