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Class Information
Number: 521/131
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 formation prior to or during solid polymer formation in the presence of a stated ingredient other than water > Ingredient contains only carbon and hydrogen atoms, only c and halogen atoms, or only c, h, and halogen atoms
Description: Subject matter wherein the stated ingredient contains (1) only carbon and hydrogen atoms, or (2) only carbon, hydrogen, and halogen atoms, or (3) only carbon and halogen atoms.

Sub-classes under this class:

Class Number Class Name Patents
521/132 Said ingredient is substantially nonvolatile material, e.g., hydrocarbon waxes, greases, etc. 110

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
5061394 Azeotropic composition of 1-chloro-1,2,2,2-tetrafluoroethane and dimethyl ether Oct. 29, 1991
5057547 Rigid foams using blends of chlorofluorocarbons and hydrocarbons as blowing agent Oct. 15, 1991
5039445 Ternary azeotropic compositions of N-perfluorobutylethylene and cis-1,2-dichloroethylene with methanol or ethanol or isopropanol Aug. 13, 1991
5037860 Flexible polyurethane foam prepared using 1,1,1-trichloroethane as a blowing agent Aug. 6, 1991
5037573 Binary azeotropic compositions of 1,1-dichloro-1-fluoroethane and n-perfluorobutylethylene Aug. 6, 1991
5037572 Ternary azeotropic compositions of n-perfluorobutylethylene and trans-1,2-dichloroethylene with methanol or ethanol or isopropanol Aug. 6, 1991
5035830 Binary azeotropic compositions of hexafluoropropylene/ethylene cyclic dimer with methanol or ethanol Jul. 30, 1991
5034425 Rigid polyurethane foam, process for producing the same, and heat insulators and refrigerators using such polyurethane foam Jul. 23, 1991
5034424 Rigid foam and process for producing the same Jul. 23, 1991
5034149 Binary azeotropic compositions of 3-chloro-1,1,1-trifluoropropane with methanol or ethanol, or trans-1,2-dichloroethylene Jul. 23, 1991
5032623 Rigid foams using CHClF.sub.2 as a blowing agent Jul. 16, 1991
5028636 Liquid polyisocyanate mixtures, a process for their preparation, and their use in the preparation of polyurethane foams Jul. 2, 1991
5026499 Ternary azeotropic compositions of hexafluoropropylene/ethylene cyclic dimer with trans-1,2-dichloroethylene and methanol Jun. 25, 1991
5026497 Azeotropic compositions of perfluoro-1,2-dimethylcyclobutane with methanol and 1,1-dichloro-1-fluoroethane or dichlorotrifluoroethane Jun. 25, 1991
5023010 Binary azeotropic compositions of 1,1,1,2,3,3-hexafluoro-3-methoxypropane with methanol or isopropanol or N-propanol Jun. 11, 1991
5023009 Binary azeotropic compositions of 1,1,1,2,3,3-hexafluoro-3-methoxypropane and 2,2,3,3,3-pentafluoropropanol-1 Jun. 11, 1991
5021536 Storage stable resin reaction mixtures, and the preparation and use thereof Jun. 4, 1991
5019603 Process for the production of porous phenolic resin fibers May. 28, 1991
5015685 Preparation of tetrabromotetralin May. 14, 1991
5001164 Polyurethane foam prepared with reduced levels of hard halocarbon blowing agents Mar. 19, 1991
5001165 Polyoxyalkylene solubilizers for polyol blends Mar. 19, 1991
4999127 Azeotropic composition of 2-chloro-1,1,2-trifluoroethyl-2-difluoromethyl ether with trans-1,2-dichloroethylene and methnanol Mar. 12, 1991
4997858 Method for preparing a flexible polyurethane foam Mar. 5, 1991
4997589 Azeotrope-like compositions of 1,2-difluoroethane and dichlorotrifluoroethane Mar. 5, 1991
4997706 Foaming system for closed-cell rigid polymer foam Mar. 5, 1991
4996242 Polyurethane foams manufactured with mixed gas/liquid blowing agents Feb. 26, 1991
4994202 Azeotropic compositions of perfluoro-1,2-dimethylcyclobutane with 1,1-dichloro-1-fluoroethane or dichlorotrifluoroethane Feb. 19, 1991
4992483 Polyurethane foam product and process Feb. 12, 1991
4986930 Polyol-blowing agent compositions with improved storage stability Jan. 22, 1991
4986928 Binary azeotropic compositions of 1-chloro-1,2,2-trifluorocyclobutane and methanol Jan. 22, 1991
4981879 Rigid foam with improved "K" factor from perfluorinated hydrocarbons Jan. 1, 1991
4980388 Use of carbon dioxide adducts as blowing agents in cellular and microcellular polyureas Dec. 25, 1990
4972003 Foaming system for rigid urethane and isocyanurate foams Nov. 20, 1990
4970013 Binary azeotropic composition of 2,3-dichloro-1,1,1,3-3-pentafluoropropane and methanol Nov. 13, 1990
4966921 Method, a compound, and a blowing agent for making plastic foam Oct. 30, 1990
4960804 Rigid foams using blends of chlorofluorocarbons and alkyl alkanoates as blowing agent Oct. 2, 1990
4954289 Azeotropes of hydrogen-containing halocarbons with butanes Sep. 4, 1990
4954290 Azeotropes of a hydrogen-containing halocarbon with pentanes Sep. 4, 1990
4945119 Foaming system for rigid urethane and isocyanurate foams Jul. 31, 1990
4931482 Use of 1,1,1,4,4,4-hexaefluorobutane as a blowing and insulating gas for the production of foam plastics Jun. 5, 1990
4931480 Process for the preparation of polyurethane foams Jun. 5, 1990
4927863 Process for producing closed-cell polyurethane foam compositions expanded with mixtures of blowing agents May. 22, 1990
4927861 Rigid polyurethane preparation process May. 22, 1990
4925881 Heat resistant foamable thermosetting resin systems May. 15, 1990
4920154 Substantially closed cell shaped hard phenol foam and method for preparing that phenol foam Apr. 24, 1990
4906673 Polyurethane composition Mar. 6, 1990
4900365 Azeotrope-like compositions of trichlorofluoromethane, dichlorotrifluoroethane and isopentane Feb. 13, 1990
4900759 Phenolic foams Feb. 13, 1990
4898893 Blowing agents for isocyanurate foams and method for producing the same Feb. 6, 1990
4892892 Flame retardant polyurethane foam compositions containing polynuclearbrominated alkylbenzene Jan. 9, 1990

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