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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
6248802 Isocyanate compositions for blown polyurethane foams Jun. 19, 2001
6245824 Silicone surfactants for making polyurethane flexible molded foams Jun. 12, 2001
6245826 Isocyanate-based rigid foam Jun. 12, 2001
6239186 Silicone surfactants for the production of open cell polyurethane flexible foams May. 29, 2001
6235799 Method for producing soft to medium-hard structural polyurethane foams May. 22, 2001
6225364 Foams comprising HFC-134 and a low solubility co-blowing agent and a process for making May. 1, 2001
6218443 Pentafluoropropane blowing agent-containing resin blend for use in making integral skin foams Apr. 17, 2001
6211259 Low volatile reinforcing system Apr. 3, 2001
6204299 Omega-hydrofluoroalkyl ethers, precursor carboxylic acids and derivatives thereof, and their preparation and application Mar. 20, 2001
6200495 Premix compositions of polyol, blowing agent, and optionally additives having improved storage stability Mar. 13, 2001
6197839 Process for preparing compact or cellular polyurethane elastomers and isocyanate prepolymers suitable for this purpose Mar. 6, 2001
6136876 Weak bronsted acid derivatives for improving dimensional stability of polyurethane flexible foams Oct. 24, 2000
6136875 High productivity, low fugitive emission foams and foam processes Oct. 24, 2000
6136877 142b/124 blowing agent blends Oct. 24, 2000
6133332 Process for producing phenolic resin foams Oct. 17, 2000
6133329 Aromatic polyester polyols made from a natural oil Oct. 17, 2000
6130268 Two component polyurethane construction adhesive Oct. 10, 2000
6121337 Compositions containing 1,1,2,2-tetrafluoroethane (HFC-134) for closed-cell polymer foam production Sep. 19, 2000
6121338 Process for rigid polyurethane foams Sep. 19, 2000
6117917 Blowing agent blends and use thereof Sep. 12, 2000
6117914 142b/124 blowing agent blends Sep. 12, 2000
6107359 Polyether polyols, polyol formulation containing them and their use in the production of hard polyurethane foams Aug. 22, 2000
6100230 Azeotrope-like compositions of pentafluoropropane, hydrocarbons and water Aug. 8, 2000
6100308 Preparation of polyurethanes having improved curing Aug. 8, 2000
6086784 Premixes for the preparation of polyurethane or polyisocyanurate foams Jul. 11, 2000
6086788 Hydrofluorocarbon blown foam and method for preparation thereof Jul. 11, 2000
6087408 Process for the production of polyolefin resin foams Jul. 11, 2000
6080799 Mixtures containing 1,1,1,3,3 pentafluorobutane Jun. 27, 2000
6080800 Aqueous wax dispersions as cell openers in making polyurethane flexible foams Jun. 27, 2000
6071977 Hydrosilation in high boiling natural vegetable oils Jun. 6, 2000
6071978 Method of producing hydrocarbon-expanded rigid polyurethane foams Jun. 6, 2000
6054499 Prepolymer composition for insulating foams Apr. 25, 2000
6043291 Method for producing foamed synthetic resin Mar. 28, 2000
6043290 Dimensional stabilizing, cell opening additives for polyurethane flexible foams Mar. 28, 2000
6040349 Production of rigid polyurethanes foams with reduced density Mar. 21, 2000
6034145 Process for rigid polyurethane foams Mar. 7, 2000
6031011 Tropodegradable bromine-containing halocarbons as foam blowing agents Feb. 29, 2000
6020392 Polyurea elastomeric microcellular foam Feb. 1, 2000
6013194 Azeotrope(like) compositions including a hexafluoropropane and butane Jan. 11, 2000
6013690 Low density rigid polyurethane foams having improved substrate adhension characteristics Jan. 11, 2000
6013691 Expansible sealant compositions and blowing agents Jan. 11, 2000
6013689 Method for making a closed-cell phenolic resin foam, foamable composition, and closed-cell phenolic resin foam Jan. 11, 2000
6011189 Method of producing rigid foams and products produced therefrom Jan. 4, 2000
5998494 Rigid polyurethane foams Dec. 7, 1999
5977198 Process for the production of resilient, flexible polyurethane foams Nov. 2, 1999
5968427 Foamed rubber compositions for pneumatic tires and method of producing the same Oct. 19, 1999
5962542 Process for producing hydrocarbon-blown hard polyurethane foams Oct. 5, 1999
5962541 Isocyanate-terminated prepolymers and rigid-foams produced therefrom Oct. 5, 1999
5958992 Blowing agent blends Sep. 28, 1999
5958991 Open-loop method for producing a controlled blend of polyol and blowing agent for use in the manufacture of polyurethane foam Sep. 28, 1999

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