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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
6326412 Polyurethane foam and process for production Dec. 4, 2001
6319962 Hydrocarbon blown rigid polyurethane foams having improved flammability performance Nov. 20, 2001
6316513 Process for the producing of hard polyurethane foams with low heat conductivity Nov. 13, 2001
6310114 Method of preparing compact or cellular polyurethane elastomers and isocyanate prepolymers suitable therefor Oct. 30, 2001
6310111 Blowing agent blends Oct. 30, 2001
6306920 Method for producing closed-cell rigid polyurethane foams having low thermal conductivity Oct. 23, 2001
6303668 Azeotropic or pseudo-azeotropic composition and use of these compositions Oct. 16, 2001
6297342 Method and mixing head for producing a reaction mixture from an isocyanate and a higher-viscous polyol formulation Oct. 2, 2001
6294590 Reduction of color degradation of triphenylmethane polymeric colorants within polyurethane foams Sep. 25, 2001
6288135 Azeotrope-like compositions of pentafluoropropane, hydrocarbons and water Sep. 11, 2001
6288134 Flexible polyurethane foams Sep. 11, 2001
6271274 Open-cell polyisocyanurate foam for fixing and supporting plants Aug. 7, 2001
6271279 High resilient flexible urethane foam and flexible molded foams based on allophanate modified isocyanates Aug. 7, 2001
6265457 Isocyanate-based polymer foam and process for production thereof Jul. 24, 2001
6265456 Hydrosilation in high boiling natural oils Jul. 24, 2001
6262136 Storage stable foam-forming system Jul. 17, 2001
6262139 Polyisocyanate compositions for the preparation of flexible polyurethane foams Jul. 17, 2001
6262135 Polyurethane foam containing a blend of monomeric and oligomeric flame retardants Jul. 17, 2001
6258866 Blowing agent compatabilization Jul. 10, 2001
6258867 Method for making semi-rigid energy-absorbing foam with polyurethane fillers Jul. 10, 2001
6255431 Compositions of polytetramethylene ether glycols and polyoxy alkylene polyether polyols having a low degree of unsaturation Jul. 3, 2001
6248802 Isocyanate compositions for blown polyurethane foams Jun. 19, 2001
6245824 Silicone surfactants for making polyurethane flexible molded foams Jun. 12, 2001
6239186 Silicone surfactants for the production of open cell polyurethane flexible foams May. 29, 2001
6239188 Urethane molded products for polishing pad and method for making same May. 29, 2001
6235799 Method for producing soft to medium-hard structural polyurethane foams May. 22, 2001
6235804 Silicone surfactants for making polyurethane flexible molded foams May. 22, 2001
6232356 Reactive catalyst compositions for improving water blown polyurethane foam performance May. 15, 2001
6228899 Production of flexible polyurethane foams May. 8, 2001
6221929 Rigid foamed polyurethane-forming compositions, foamed polyurethane moldings and models made of the same Apr. 24, 2001
6218443 Pentafluoropropane blowing agent-containing resin blend for use in making integral skin foams Apr. 17, 2001
6211258 Process for preparing rigid and flexible polyurethane foams Apr. 3, 2001
6204300 Low resilience urethane foam Mar. 20, 2001
6201033 Reactive catalyst compositions for improving water blown polyurethane foam performance Mar. 13, 2001
6187893 Two-component polyurethane systems which contain reactive diluents Feb. 13, 2001
6187832 Process for making flexible polyurethane foams Feb. 13, 2001
6184262 Benzotriazole stabilizers for polyols and polyurethane foam Feb. 6, 2001
6184410 Carbodiimides based on 1,3-bis(1-methyl-1-isocyanatoethyl)benzene Feb. 6, 2001
6169124 Inner parting agents for producing self-parting moldings made of polyisocyanate polyaddition products Jan. 2, 2001
6156814 Amido functional amine catalysts for the production of polyurethanes Dec. 5, 2000
6153659 3-{N-[2-(N',N'-dimethylamino ethoxy)ethyl]-N-methylamino}propionamide for the production of polyurethanes Nov. 28, 2000
6147134 Process for preparing rigid and flexible polyurethane foams Nov. 14, 2000
6136876 Weak bronsted acid derivatives for improving dimensional stability of polyurethane flexible foams Oct. 24, 2000
6136879 Soft polyurethane foam, method of producing the same and vehicle interior member using the same Oct. 24, 2000
6127442 Process for foam production using dissolved under pressure carbon dioxide Oct. 3, 2000
6127443 Energy management polyurethane rigid foams with high recovery Oct. 3, 2000
6121337 Compositions containing 1,1,2,2-tetrafluoroethane (HFC-134) for closed-cell polymer foam production Sep. 19, 2000
6117937 Polymer polyol and flame retardant polyurethane resin and foam prepared therefrom Sep. 12, 2000
6114402 Modified rigid, foamable urethane composition and method Sep. 5, 2000
6107355 Production of polyurethane foams Aug. 22, 2000

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