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Class Information
Number: 521/170
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. > Cellular product derived from a -n=c=x containing reactant wherein x is a chalcogen atom > With -xh reactant wherein x is a chalcogen atom
Description: Subject matter wherein a -XH (X is a chalcogen containing material) is reacted with a -N=C=X containing material.










Sub-classes under this class:

Class Number Class Name Patents
521/174 -xh reactant contains a c-x-c group 1,057
521/172 -xh reactant contains a c=x group, e.g., carboxylic acid ester, etc. 540
521/171 -xh reactant contains a halogen atom 82


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
5844008 Process for treating municipal solid waste Dec. 1, 1998
5844013 Hydrophilic polyurethane gel foams, particularly for treating deep wounds, wound dressing based on hydrophilic polyurethane gel foams and method of manufacture Dec. 1, 1998
5840779 Catalysts which stabilize hydrohalocarbon blowing agent in polyurethane foam formulations Nov. 24, 1998
5824711 N,N,N'-trimethylbis (Aminoethyl) ether substituted urea compostions for the production of polyurethanes Oct. 20, 1998
5807958 Catalysts for the manufacture of polyurethanes and/or polyureas Sep. 15, 1998
5798533 Polyol compositions having good flow and water blown rigid polyurethane foams made thereby having good dimensional stability Aug. 25, 1998
5773484 Enol-ether capped polyethers and surfactants produced therefrom Jun. 30, 1998
5744509 Foamed polymer and process for production thereof Apr. 28, 1998
5736588 Process for preparing rigid polyurethane foams Apr. 7, 1998
5730896 Polymeric foams Mar. 24, 1998
5721285 Thermal insulating foamed material and method of manufacturing the same Feb. 24, 1998
5719201 Superabsorbent hydrophilic isocyanate-based foam and process for production thereof Feb. 17, 1998
5710191 Hydroxymethyl quinuclidine catalyst compositions for making polyurethane foams Jan. 20, 1998
5710192 Polydiene diols in resilient polyurethane foams Jan. 20, 1998
5700869 Polyurethane compositions having internal mold release properties Dec. 23, 1997
5693686 Foam-forming mixtures with decreased decomposition of hydrohalocarbon blowing agents Dec. 2, 1997
5691389 Recycling of flexible foam Nov. 25, 1997
5688834 Catalysts which stabilize hydrohalocarbon blowing agent in polyurethane foam formulations Nov. 18, 1997
5674917 Superabsorbent hydrophilic isocyanate-based foam and process for production thereof Oct. 7, 1997
5641816 Process for the production of polyol compounds Jun. 24, 1997
5633289 Process for molding an integral skin foam and a polyurethane material for molding the same May. 27, 1997
5631319 Pressurized, blowing-agent-containing isocyanate semiprepolymer mixtures based on mixtures of polyhydroxyl compounds and monoalcohols and/or hydroxyketones, the use thereof for the production May. 20, 1997
5624966 Process of making an integral skin polyurethane article Apr. 29, 1997
5622777 Heat-resistant reinforced foam Apr. 22, 1997
5621051 Process for preparation of polyurethane-polycarbodiimide foam Apr. 15, 1997
5621016 Polyisocyanate compositions and low density flexible polyurethane foams produced therewith Apr. 15, 1997
5618854 Combustion-modified flexible polyurethane foams Apr. 8, 1997
5616677 Preparation of sprayable aliphatic polyurea elastomers having improved properties Apr. 1, 1997
5614605 Rigid polyurethanes based on allophanate-modified aliphatic and/or cycloaliphatic polyisocyanurates Mar. 25, 1997
5605935 Recycling of flexible foam Feb. 25, 1997
5602190 Process for the production of hard polyurethane foams Feb. 11, 1997
5597942 Carbodiimides and/or oligomeric polycarbodiimides based on 1 3-bis (1-methyl-1-isocyanatoethyl) benzene their use as hydrolysis stabilizers Jan. 28, 1997
5591781 Process for producing polyurethane foam with high curing rate Jan. 7, 1997
5578656 Methods of preparing polymeric foams using cyclic urea blowing promoters Nov. 26, 1996
5569682 Fire-retardant polyurethane foams and method of producing Oct. 29, 1996
5563232 Rim process utilizing isocyanates based upon 2,4'- and 4,4'-diphenylmethane diisocyanate Oct. 8, 1996
5561171 Catalysts which stabilize hydrohalocarbon blowing agent in polyisocyanurate foam formulations during polymerization Oct. 1, 1996
5561172 Method of producing rigid polyurethane foams Oct. 1, 1996
5552450 Production of rigid polyurethane foams Sep. 3, 1996
5550169 Preparation of water-impermeable polyurethane foam Aug. 27, 1996
5541234 Process for making low density hydrogel materials having high surface areas Jul. 30, 1996
5539011 Use of softening additives in polyurethane foam Jul. 23, 1996
5539008 Foamable composition containing unsaturated perfluorochemical blowing agent Jul. 23, 1996
5539007 Catalyst compositions for making polyurethane based on imidazoles and boron compounds Jul. 23, 1996
5536757 Polyurethane foams Jul. 16, 1996
5532283 Azeotropic compositions of 1,1,1,4,4,4-hexafluorobutane and 2-methyl butane and the use thereof in the production of foams Jul. 2, 1996
5530035 Method of preparing polyurethane foam of low thermal conductivity Jun. 25, 1996
5523332 Processability of hydrocarbon blown, polyisocyanate based foams through use of a compatibilizing agent Jun. 4, 1996
5523330 Process for producing a foamed isocyanate-based polymer Jun. 4, 1996
5521226 Method of producing resilient polyoxyalkylene polyurethane foams May. 28, 1996

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