by treatment with organic compounds containing nitrogen, sulfur or phosphorus

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C08J11/28

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CCHEMISTRY METALLURGY C08Organic compounds C08JWORKING-UP GENERAL PROCESSES OF COMPOUNDING AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G C08J11/00Recovery or working-up of waste materials

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C08J11/28by treatment with organic compounds containing nitrogen, sulfur or phosphorus

Industries

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Patents Grantslast 30 patents

Information Patent Grant
Methods for recovering and reusing polymeric binders from composite...
- Patent number 12,132,176
- Issue date Oct 29, 2024
- The Trustees of Columbia University In the City of New York
- Lauren Elizabeth Marbella
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Recyclable and reworkable epoxy resins
- Patent number 12,065,533
- Issue date Aug 20, 2024
- ADITYA BIRLA CHEMICALS (THAILAND) LTD. (EPOXY DIVISION)
- Chandan Kumar Singh
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Aerobic depolymerization of fiber-reinforced composites
- Patent number 11,926,710
- Issue date Mar 12, 2024
- University of Southern California
- Travis J. Williams
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Polymers depolymerizable by metathesis of a cleavable unit
- Patent number 11,873,367
- Issue date Jan 16, 2024
- National Technology & Engineering Solutions of Sandia, LLC
- Brad Howard Jones
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Media recycling and sanitization
- Patent number 11,795,292
- Issue date Oct 24, 2023
- International Business Machines Corporation
- Gregory Breyta
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Recycling process for the recovery of cotton from polyester-cotton...
- Patent number 11,787,917
- Issue date Oct 17, 2023
- International Business Machines Corporation
- Gregory Breyta
- D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
Information Patent Grant
Compositions of and methods for producing modified monomers and pol...
- Patent number 11,629,228
- Issue date Apr 18, 2023
- Saudi Arabian Oil Company
- Ali Hayek
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Grant
Methods relating to polyurethane foam-containing and degradable foa...
- Patent number 11,597,235
- Issue date Mar 7, 2023
- Bridgestone Americas Tire Operations, LLC
- Joshua P. Abell
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Recovering heavy hydrocarbons from plastic materials and geoformation
- Patent number 11,492,456
- Issue date Nov 8, 2022
- Mansour S. Bader
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Chemical recycling of polyethylene terephthalate by microwave irrad...
- Patent number 11,479,651
- Issue date Oct 25, 2022
- The University of North Carolina at Chapel Hill
- Matthew Parrott
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Method of continuous preparation of reclaimed rubber using multi-st...
- Patent number 11,453,758
- Issue date Sep 27, 2022
- NANJING GREEN GOLD GIANT RUBBER & PLASTIC HI-TECH CO., LTD.
- Liqun Zhang
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Carbon supports for oxygen reduction catalysts
- Patent number 11,384,219
- Issue date Jul 12, 2022
- UT-Battelle, LLC
- Amit K. Naskar
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Carbon fiber recovery compositions and methods
- Patent number 11,377,535
- Issue date Jul 5, 2022
- The Boeing Company
- Adam F. Gross
- B09 - DISPOSAL OF SOLID WASTE RECLAMATION OF CONTAMINED SOIL SOIL
Information Patent Grant
Synthetic base and associated methods
- Patent number 11,311,036
- Issue date Apr 26, 2022
- Green Products & Technologies, L.L.C.
- John T. MacDonald
- A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
Information Patent Grant
Recovery of fibers from fiber reinforced polymers with Lewis bases
- Patent number 11,208,345
- Issue date Dec 28, 2021
- The Boeing Company
- Adam F. Gross
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Lewis base-mediated recovery of fibers from fiber reinforced polymers
- Patent number 11,167,451
- Issue date Nov 9, 2021
- The Boeing Company
- Adam F. Gross
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Addition of biodegradability lending additives to plastic materials
- Patent number 11,111,355
- Issue date Sep 7, 2021
- BIOLOGIQ, INC.
- Bradford LaPray
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Rubber composition for downhole tools and member for downhole tools
- Patent number 11,059,952
- Issue date Jul 13, 2021
- Kureha Corporation
- Fuminori Kobayashi
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method for reclaiming rubber, and renewed rubber compositions obtai...
- Patent number 11,041,059
- Issue date Jun 22, 2021
- Rijksuniversiteit Groningen
- Francesco Picchioni
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Methods of synthesizing ionic liquids from primary alcohol-containi...
- Patent number 11,028,249
- Issue date Jun 8, 2021
- National Technology & Engineering Solutions of Sandia, LLC
- Tanmoy Dutta
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Reusable capture complex
- Patent number 10,954,355
- Issue date Mar 23, 2021
- Ioniqa Techonolgies B.V.
- Susanne Van Berkum
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Polymer degradation
- Patent number 10,947,362
- Issue date Mar 16, 2021
- Ioniqa Techonolgies B.V.
- Tonnis Hooghoudt
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Biodegradation of polymer using surface chemistry
- Patent number 10,941,270
- Issue date Mar 9, 2021
- John Nguyen Ta
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Chemical recycling of polyethylene terephthalate by microwave irrad...
- Patent number 10,858,493
- Issue date Dec 8, 2020
- The University of North Carolina at Chapel Hill
- Matthew Parrott
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Catalyst complex and method of degradation of a polymer material
- Patent number 10,858,494
- Issue date Dec 8, 2020
- Ioniqa Technologies B.V.
- Sonja Irene-Marie Reginalde Castillo
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Method for producing rubber-modified bitumen using vulcanized rubber
- Patent number 10,844,190
- Issue date Nov 24, 2020
- LANXESS Deutschland GmbH
- Thomas Klein
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Magnetically-recoverable catalysts for depolymerization
- Patent number 10,767,027
- Issue date Sep 8, 2020
- National Technology & Engineering Solutions of Sandia, LLC
- Jian Sun
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Polymer degradation
- Patent number 10,703,703
- Issue date Jul 7, 2020
- Ioniqa Technologies B.V.
- Marcel Vilaplana Artigas
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Methods for chemical degradation of epoxies using organic salts as...
- Patent number 10,696,815
- Issue date Jun 30, 2020
- Washington State University
- Jinwen Zhang
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Recovery of fibers reinforced polymers with lewis bases
- Patent number 10,662,108
- Issue date May 26, 2020
- The Boeing Company
- Adam F. Gross
- C01 - INORGANIC CHEMISTRY

Patents Applicationslast 30 patents

Information Patent Application
BENZOXAZINE COMPOSITION, AND USE THEREOF
- Publication number 20240384031
- Publication date Nov 21, 2024
- Kaneka Corporation
- Takefumi Furuta
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PRODUCTION OF PU FOAMS USING RECYCLED POLYOLS
- Publication number 20240309207
- Publication date Sep 19, 2024
- Evonik Operations GmbH
- Ralph Marquardt
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PRODUCTION OF PU FOAMS
- Publication number 20240309145
- Publication date Sep 19, 2024
- Evonik Operations GmbH
- Annegret Terheiden
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PROCESS FOR THE DECOMPOSITION OF POLYURETHANE
- Publication number 20240301161
- Publication date Sep 12, 2024
- Herbert BETTINGER
- C07 - ORGANIC CHEMISTRY
Information Patent Application
Method and Reactor System For Depolymerizing A Terephthalate-Polyme...
- Publication number 20240287280
- Publication date Aug 29, 2024
- Ioniqa Technologies B.V.
- Egor Vasilyevich FUFACHEV
- C07 - ORGANIC CHEMISTRY
Information Patent Application
DEVULCANIZING ADDITIVE, RELATIVE METHOD OF DEVULCANIZATION AND DEVU...
- Publication number 20240262977
- Publication date Aug 8, 2024
- Rubber Conversion S.r.l.
- Filippo FOCHESATO COLOMBANI
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHOD FOR DEGRADING POLYURETHANE ACRYLIC RESIN MATERIAL, POLYURETH...
- Publication number 20240239987
- Publication date Jul 18, 2024
- Swancor Innovation & Incubation Co., Ltd.
- Jun-Qi KAO
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
DEPOLYMERIZATION OF POLYMERS WITH AMMONIA AND AMINES
- Publication number 20240228737
- Publication date Jul 11, 2024
- Research Triangle Institute
- Ofei D. MANTE
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
POLYCARBONATE OLIGOMER, MANUFACTURING METHOD THEREOF, CURABLE COMPO...
- Publication number 20240218121
- Publication date Jul 4, 2024
- Swancor Innovation & Incubation Co., Ltd.
- Meng-Wei WANG
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHOD OF DESULFURIZING SULFUR-CROSSLINKED RUBBER
- Publication number 20240209177
- Publication date Jun 27, 2024
- Toyoda Gosei Co., Ltd.
- Yuki OKABE
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHODS FOR CHEMICAL RECYCLING OF CONDENSATION POLYMERS
- Publication number 20240182665
- Publication date Jun 6, 2024
- Board of Trustees of Michigan State University
- Muhammad Rabnawaz
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
ANTIPOLYMERANT COMPOSITIONS WITH NAPHTHOQUINONE AND HYDROXYLAMINE A...
- Publication number 20240141131
- Publication date May 2, 2024
- ECOLAB USA INC.
- Jonathan Masere
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHOD FOR CLEANING SEMICONDUCTOR SUBSTRATE, METHOD FOR MANUFACTURI...
- Publication number 20240132806
- Publication date Apr 25, 2024
- NISSAN CHEMICAL CORPORATION
- Masafumi YAGYU
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Additive for recycling thermoset materials, recyclable thermoset co...
- Publication number 20240101784
- Publication date Mar 28, 2024
- CHANDA CHEMICAL CORP.
- Chien-Hsin Wu
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHODS OF PLASTIC RECYCLING USING HIGHLY EFFICIENT ORGANOCATALYSTS
- Publication number 20240067594
- Publication date Feb 29, 2024
- UT-Battelle, LLC
- Tomonori Saito
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
PLASTIC RECYCLING SYSTEM USING SOLVENT-TARGETED RECOVERY AND PRECIP...
- Publication number 20240059858
- Publication date Feb 22, 2024
- Wisconsin Alumni Research Foundation
- George Huber
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
CHEMICAL RECYLING OF PLASTICS USING IONIC LIQUIDS OR DEEP EUTECTIC...
- Publication number 20240052133
- Publication date Feb 15, 2024
- The Regents of the University of California
- Chang Dou
- C12 - BIOCHEMISTRY BEER SPIRITS WINE VINEGAR MICROBIOLOGY ENZYMOLOGY MUTATION...
Information Patent Application
UPGRADED STABILIZED POLYOL COMPOSITION
- Publication number 20240043604
- Publication date Feb 8, 2024
- Huntsman International LLC
- Leema Joseph
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
UPCYCLING MIXED WASTE PLASTIC THROUGH CHEMICAL DEPOLYMERIZATION AND...
- Publication number 20240018555
- Publication date Jan 18, 2024
- ALLIANCE FOR SUSTAINABLE ENERGY, LLC
- Gregg Tyler BECKHAM
- C12 - BIOCHEMISTRY BEER SPIRITS WINE VINEGAR MICROBIOLOGY ENZYMOLOGY MUTATION...
Information Patent Application
MEDIA RECYCLING AND SANITIZATION
- Publication number 20240002629
- Publication date Jan 4, 2024
- International Business Machines Corporation
- Gregory Breyta
- C07 - ORGANIC CHEMISTRY
Information Patent Application
RECYCLING PROCESS FOR THE RECOVERY OF COTTON FROM POLYESTER-COTTON...
- Publication number 20230416492
- Publication date Dec 28, 2023
- International Business Machines Corporation
- Gregory Breyta
- D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
Information Patent Application
IMPROVED METHOD FOR RECYCLING PET BY ALCOHOLYSIS
- Publication number 20230399485
- Publication date Dec 14, 2023
- RECYC'ELIT
- Raouf Medimagh
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PROCESS AND PLANT FOR RECYCLING FABRICS
- Publication number 20230392297
- Publication date Dec 7, 2023
- SANKO TEKSTIL ISLETMELERI SAN. VE TIC. A.S.
- Agamirze HAMITBEYLI
- D01 - NATURAL OR ARTIFICIAL THREADS OR FIBRES SPINNING
Information Patent Application
Value Chain Return Process for Spent Polyamides by Hydrogenation
- Publication number 20230374254
- Publication date Nov 23, 2023
- BASF SE
- Thomas Schaub
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Value Chain Return Process for Spent Polyurethanes by Hydrogenation
- Publication number 20230374195
- Publication date Nov 23, 2023
- BASF SE
- Thomas Schaub
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
USE OF RED TO NEAR-INFRARED HEAT-GENERATING ORGANIC DYES FOR REPROC...
- Publication number 20230374253
- Publication date Nov 23, 2023
- UNIVERSITE DE HAUTE-ALSACE
- Jacques LALEVÉE
- B32 - LAYERED PRODUCTS
Information Patent Application
METHOD FOR CHEMICAL UPCYCLING OF RESINS CONTAINING ESTER BONDS
- Publication number 20230357533
- Publication date Nov 9, 2023
- Zhejiang University
- TAO XIE
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHOD FOR PRODUCING AND CHEMICALLY RECYCLING A CROSSLINKED THIOL-B...
- Publication number 20230340224
- Publication date Oct 26, 2023
- Arizona Board of Regents on behalf of Arizona State University
- Kailong Jin
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHOD FOR PRODUCING BISPHENOL A AND METHOD FOR PRODUCING POLYCARBO...
- Publication number 20230340196
- Publication date Oct 26, 2023
- MITSUBISHI CHEMICAL CORPORATION
- Kei Uchiyama
- C07 - ORGANIC CHEMISTRY
Information Patent Application
NEW DEPOLYMERIZATION METHOD FOR POLYURETHANES
- Publication number 20230340223
- Publication date Oct 26, 2023
- Evonik Operations GmbH
- Jens Hildebrand
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...

by treatment with organic compounds containing nitrogen, sulfur or phosphorus

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Methods for recovering and reusing polymeric binders from composite...

Recyclable and reworkable epoxy resins

Aerobic depolymerization of fiber-reinforced composites

Polymers depolymerizable by metathesis of a cleavable unit

Media recycling and sanitization

Recycling process for the recovery of cotton from polyester-cotton...

Compositions of and methods for producing modified monomers and pol...

Methods relating to polyurethane foam-containing and degradable foa...

Recovering heavy hydrocarbons from plastic materials and geoformation

Chemical recycling of polyethylene terephthalate by microwave irrad...

Method of continuous preparation of reclaimed rubber using multi-st...

Carbon supports for oxygen reduction catalysts

Carbon fiber recovery compositions and methods

Synthetic base and associated methods

Recovery of fibers from fiber reinforced polymers with Lewis bases

Lewis base-mediated recovery of fibers from fiber reinforced polymers

Addition of biodegradability lending additives to plastic materials

Rubber composition for downhole tools and member for downhole tools

Method for reclaiming rubber, and renewed rubber compositions obtai...

Methods of synthesizing ionic liquids from primary alcohol-containi...

Reusable capture complex

Polymer degradation

Biodegradation of polymer using surface chemistry

Chemical recycling of polyethylene terephthalate by microwave irrad...

Catalyst complex and method of degradation of a polymer material

Method for producing rubber-modified bitumen using vulcanized rubber

Magnetically-recoverable catalysts for depolymerization

Polymer degradation

Methods for chemical degradation of epoxies using organic salts as...

Recovery of fibers reinforced polymers with lewis bases

Patents Applicationslast 30 patents

BENZOXAZINE COMPOSITION, AND USE THEREOF

PRODUCTION OF PU FOAMS USING RECYCLED POLYOLS

PRODUCTION OF PU FOAMS

PROCESS FOR THE DECOMPOSITION OF POLYURETHANE

Method and Reactor System For Depolymerizing A Terephthalate-Polyme...

DEVULCANIZING ADDITIVE, RELATIVE METHOD OF DEVULCANIZATION AND DEVU...

METHOD FOR DEGRADING POLYURETHANE ACRYLIC RESIN MATERIAL, POLYURETH...

DEPOLYMERIZATION OF POLYMERS WITH AMMONIA AND AMINES

POLYCARBONATE OLIGOMER, MANUFACTURING METHOD THEREOF, CURABLE COMPO...

METHOD OF DESULFURIZING SULFUR-CROSSLINKED RUBBER

METHODS FOR CHEMICAL RECYCLING OF CONDENSATION POLYMERS

ANTIPOLYMERANT COMPOSITIONS WITH NAPHTHOQUINONE AND HYDROXYLAMINE A...

METHOD FOR CLEANING SEMICONDUCTOR SUBSTRATE, METHOD FOR MANUFACTURI...

Additive for recycling thermoset materials, recyclable thermoset co...

METHODS OF PLASTIC RECYCLING USING HIGHLY EFFICIENT ORGANOCATALYSTS

PLASTIC RECYCLING SYSTEM USING SOLVENT-TARGETED RECOVERY AND PRECIP...

CHEMICAL RECYLING OF PLASTICS USING IONIC LIQUIDS OR DEEP EUTECTIC...

UPGRADED STABILIZED POLYOL COMPOSITION

UPCYCLING MIXED WASTE PLASTIC THROUGH CHEMICAL DEPOLYMERIZATION AND...

MEDIA RECYCLING AND SANITIZATION

RECYCLING PROCESS FOR THE RECOVERY OF COTTON FROM POLYESTER-COTTON...

IMPROVED METHOD FOR RECYCLING PET BY ALCOHOLYSIS

PROCESS AND PLANT FOR RECYCLING FABRICS

Value Chain Return Process for Spent Polyamides by Hydrogenation

Value Chain Return Process for Spent Polyurethanes by Hydrogenation

USE OF RED TO NEAR-INFRARED HEAT-GENERATING ORGANIC DYES FOR REPROC...

METHOD FOR CHEMICAL UPCYCLING OF RESINS CONTAINING ESTER BONDS

METHOD FOR PRODUCING AND CHEMICALLY RECYCLING A CROSSLINKED THIOL-B...

METHOD FOR PRODUCING BISPHENOL A AND METHOD FOR PRODUCING POLYCARBO...

NEW DEPOLYMERIZATION METHOD FOR POLYURETHANES