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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
4454251 Polyurea foams prepared from isocyanate, water, and a lower-alkanol Jun. 12, 1984
4454253 Polyurethane foam game ball, composition and process Jun. 12, 1984
4448902 Method and a device for the production of a reaction mixture from flowable foam-forming or solid-forming components May. 15, 1984
4444913 Modified polyisocyanurate foam and method of preparation Apr. 24, 1984
4412013 Expandable urethane sealant compositions Oct. 25, 1983
4401770 Shoe insole having antibacterial and antifungal properties Aug. 30, 1983
4379862 Process for the preparation of polyurethane resins using low molecular weight polyhydroxyl compounds prepared by the condensation of formaldehyde Apr. 12, 1983
4365024 Polyoxyalkylene/unsaturated diester reaction product for cellular foam stabilization Dec. 21, 1982
4350777 Impermeable molded articles of cellular polyurethane elastomers produced with organofunctional polysiloxane-derivatives and their use as spring elements Sep. 21, 1982
4341876 Process for the production of a foamable mixture from at least two fluid, foam forming reactants and aggregates Jul. 27, 1982
4324865 Polyurethane foams having low discoloration Apr. 13, 1982
4316935 Polyisocyanurate foam and laminates thereof and process for producing them Feb. 23, 1982
4293658 Process for rigid foams of improved friability Oct. 6, 1981
4288562 Initiators for isocyanate reactions Sep. 8, 1981
4284728 HR foams made with reactive polyol compositions having improved stability Aug. 18, 1981
4283311 Process for the production of broken down cellulose copolymers Aug. 11, 1981
4282331 Polyurethane foam prepared from a copolymer/polyol composition Aug. 4, 1981
4275172 Frothable polyurethane composition and a cellular foam produced therefrom suitable for use in joints between wallboards Jun. 23, 1981
4271273 Rigid isocyanurate polyurethane foams and method for preparing same Jun. 2, 1981
4243758 Process for the production of reaction products using aqueous formose which has been prepared with the use of a lead catalyst which lead catalyst has been removed from the formose product by c Jan. 6, 1981
4242468 Use of monohydroxylated polybutadiene as a reactive plasticizer in polyurethanes Dec. 30, 1980
4242466 Polyurethanes and their preparation Dec. 30, 1980
4234697 Method of preparing cross-linked polydiorganosiloxane using organic isocyanates and products prepared therefrom Nov. 18, 1980
4224418 Compounds containing hydroxyl groups and urethano-aryl-sulfonic acid groups Sep. 23, 1980
4220728 Process of reacting isocyanates with active hydrogen containing compounds using sulfonium zwitterions as initiators Sep. 2, 1980
4211849 Process of producing cross-linked urethane-group comprising foams of open-cell structure Jul. 8, 1980
4156060 Process for the production of poly (urethane silicate) prepolymers and cellular solid reaction products utilizing phenol silicate compounds and resinous products May. 22, 1979
4153768 Organic hydroxy silicates utilized as curing agents for polyurethane prepolymers May. 8, 1979
4151345 Method of making polyurethane utilizing nickel acetylacetonate Apr. 24, 1979
4149987 Process for preparing halogenated aromatic hydroxy ethers Apr. 17, 1979
4143003 Polyurethanes made with linear polyamines Mar. 6, 1979
4141862 Catalyst combination for polyurethanes Feb. 27, 1979
4125489 Novel prepolymers, flame retardant interpolymers prepared therefrom, and processes for the preparation thereof Nov. 14, 1978
4115299 Frothing method and an apparatus for carrying out the method Sep. 19, 1978
4110270 Process for the preparation of foams characterized by isocyanurate and urethane linkages Aug. 29, 1978
4097424 Process for the production of poly(urethane silicate) resin and foams Jun. 27, 1978
4080343 Polyurethane catalyst Mar. 21, 1978
4066579 Flame- and smoke-resistant flexible polyurethane foam and a method for producing said foam Jan. 3, 1978
4065410 Polyurethane foams having an integral skin using a mixture of polyols as the chain extender Dec. 27, 1977
4042751 Moulded panel and the method of its manufacture Aug. 16, 1977
4033909 Stable phenolic resoles Jul. 5, 1977
4032483 Manufacture of polyurethanes from bark Jun. 28, 1977
4026837 Polymeric acid salts as isocyanurate foam catalysts May. 31, 1977
4026836 Isocyanurate foam catalyst May. 31, 1977
4021383 Infused polymer containing monohydric compounds and polyurethane compositions based thereon May. 3, 1977
4021384 Infused polymer containing polyols and polyurethane compositions based thereon May. 3, 1977
4011179 Continuous sulfur foam preparation using polyisocyanates Mar. 8, 1977
3994839 Urethane modified carbodiimide foams derived from flame retardant polyols Nov. 30, 1976
3989651 Catalyst for sprayable polyisocyanurate foam composition Nov. 2, 1976
3988268 Polyurethane foam plastics which contain ionic groups Oct. 26, 1976

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