Metal cyanide catalysts

Industry

CPC
C08G65/2663

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CCHEMISTRY METALLURGY C08Organic compounds C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS C08G65/00Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule

Current Industry

C08G65/2663Metal cyanide catalysts

Industries

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Patents Grantslast 30 patents

Information Patent Grant
Polyether polymerization process
- Patent number 12,152,104
- Issue date Nov 26, 2024
- Dow Global Technologies LLC
- Haifeng Shi
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Process for the continuous production of polyoxyalkylene polyols
- Patent number 12,060,454
- Issue date Aug 13, 2024
- Covestro Intellectual Property GmbH & Co. KG
- Joerg Hofmann
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Continuous process for making polyether polyols
- Patent number 12,024,587
- Issue date Jul 2, 2024
- Dow Global Technologies LLC
- Jean-Paul Masy
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Method for producing double metal cyanide catalysts
- Patent number 11,976,165
- Issue date May 7, 2024
- Covestro Deutschland AG
- Joerg Hofmann
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Methods for forming polycarbonate ether polyols and high molecular...
- Patent number 11,965,062
- Issue date Apr 23, 2024
- Econic Technologies Ltd.
- Michael Kember
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Double metal cyanide catalyst for the production of polyether polyo...
- Patent number 11,898,007
- Issue date Feb 13, 2024
- Council of Scientific and Industrial Research
- Umesh Kumar
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Highly active double metal cyanide compounds
- Patent number 11,883,803
- Issue date Jan 30, 2024
- Henkel AG & Co. KGaA
- Jan-Erik Damke
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Polyether polymerization process
- Patent number 11,820,861
- Issue date Nov 21, 2023
- Dow Global Technologies LLC
- David A. Babb
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Polyether polymerization process
- Patent number 11,745,174
- Issue date Sep 5, 2023
- Dow Global Technologies LLC
- David K. Steelman
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
In-situ formed polyols, a process for their preparation, foams prep...
- Patent number 11,572,433
- Issue date Feb 7, 2023
- Covestro LLC
- Sharlene A. Lewis
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Catalyst complex
- Patent number 11,571,690
- Issue date Feb 7, 2023
- Dow Global Technologies LLC
- David K. Steelman
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Semi-batch process for making polycarbonate polyols via copolymeriz...
- Patent number 11,566,105
- Issue date Jan 31, 2023
- Dow Global Technologies LLC
- Nima Nikbin
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Alkoxylated secondary alcohol
- Patent number 11,485,695
- Issue date Nov 1, 2022
- Arkema France
- Jean-Philippe Gillet
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Polycarbonate based polyols
- Patent number 11,174,348
- Issue date Nov 16, 2021
- Dow Global Technologies LLC
- Nima N. Nikbin
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Alkylene oxide polymerization using a double metal cyanide catalyst...
- Patent number 11,149,117
- Issue date Oct 19, 2021
- Dow Global Technologies LLC
- David S. Laitar
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of polyether polyols
- Patent number 11,130,842
- Issue date Sep 28, 2021
- Covestro Deutschland AG
- Jörg Hofmann
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Process for making polyether diols
- Patent number 11,124,604
- Issue date Sep 21, 2021
- Dow Global Technologies LLC
- Jean-Paul Masy
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
High resiliency polyurethane foams made with high functionality, hi...
- Patent number 11,041,041
- Issue date Jun 22, 2021
- Dow Global Technologies LLC
- David A. Babb
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Polyol compositions, a process for the production of these polyol c...
- Patent number 11,028,218
- Issue date Jun 8, 2021
- Covestro LLC
- Susan B. McVey
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Process for preparing polyoxyalkylene polyols by the continuous add...
- Patent number 10,961,347
- Issue date Mar 30, 2021
- Covestro LLC
- Edward P. Browne
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Method for the preparation of polyoxyalkylene polyols
- Patent number 10,961,346
- Issue date Mar 30, 2021
- Covestro Deutschland AG
- Klaus Lorenz
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Alkoxylation process using tubular reactor
- Patent number 10,920,013
- Issue date Feb 16, 2021
- Dow Global Technologies LLC
- Nima N. Nikbin
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Base-catalyzed, long-chain, active polyethers from short chain DMC-...
- Patent number 10,851,197
- Issue date Dec 1, 2020
- Covestro LLC
- Jack R. Reese
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Method for producing polyether carbonate polyols
- Patent number 10,836,858
- Issue date Nov 17, 2020
- Covestro Deutschland AG
- Jörg Hofmann
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Method for preparing polyols
- Patent number 10,774,179
- Issue date Sep 15, 2020
- Econic Technologies Ltd.
- Michael Kember
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Process for preparing polyether polyol using DMC catalyst and conti...
- Patent number 10,767,009
- Issue date Sep 8, 2020
- Covestro LLC
- Jean-Paul Masy
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Process for the production of polyoxymethylene block copolymers
- Patent number 10,759,902
- Issue date Sep 1, 2020
- Covestro Deutschland AG
- Ilja Peckermann
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Grant
Product-to-product process for preparation of low viscosity polyoxy...
- Patent number 10,723,829
- Issue date Jul 28, 2020
- Covestro LLC
- Jack R. Reese
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Product-to-product process for preparation of low viscosity polyoxy...
- Patent number 10,723,830
- Issue date Jul 28, 2020
- Covestro LLC
- Jack R. Reese
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Method to increase the resistance of double metal cyanide catalysts...
- Patent number 10,669,368
- Issue date Jun 2, 2020
- Covestro LLC
- Edward P. Browne
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...

Patents Applicationslast 30 patents

Information Patent Application
PROCESS FOR PREPARING A POLYETHER POLYOL WITH A HIGH ETHYLENE OXIDE...
- Publication number 20240360278
- Publication date Oct 31, 2024
- SHELL USA, INC.
- Prashant Anil TATAKE
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHOD FOR PREPARING SURFACTANTS BY COPOLYMERISATION OF EPOXIDES AN...
- Publication number 20240336732
- Publication date Oct 10, 2024
- Econic Technologies Ltd.
- James LEELAND
- C11 - ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES FATTY ACIDS...
Information Patent Application
NOVEL POLYETHERS ON THE BASIS OF 2,3-EPOXYBUTANE AND PROCESS FOR TH...
- Publication number 20240191025
- Publication date Jun 13, 2024
- Evonik Operations GmbH
- Frank Schubert
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
(POLY)OL BLOCK COPOLYMER
- Publication number 20240002608
- Publication date Jan 4, 2024
- Econic Technologies Ltd.
- Michael KEMBER
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
CURABLE COMPOSITION, AND CURED PRODUCT
- Publication number 20230399464
- Publication date Dec 14, 2023
- AGC Inc.
- Daisuke KAKU
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
Polyether Polymerization Process
- Publication number 20230356207
- Publication date Nov 9, 2023
- DOW GLOBAL TECHNOLOGIES LLC
- David K. Steelman
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
MIXED-ACID MODIFIED ZINC-COBALT DOUBLE METAL CYANIDE CATALYST AND P...
- Publication number 20230338933
- Publication date Oct 26, 2023
- Hangzhou POLY Material Science & Technology Co., Ltd.
- Ming Luo
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
LOW FOAMING HYDRAULIC FLUIDS HAVING BIODEGRADABLE POLYALKYLENE GLYC...
- Publication number 20230312823
- Publication date Oct 5, 2023
- DOW GLOBAL TECHNOLOGIES LLC
- Martin R. Greaves
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Application
PROCESS FOR PRODUCING POLYOXYMETHYLENE-POLYOXYALKYLENE COPOLYMERS
- Publication number 20230212352
- Publication date Jul 6, 2023
- COVESTRO DEUTSCHLAND AG
- Aurel Wolf
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PROCESS FOR PREPARING A POLYOXYALKYLENE CARBONATE POLYOL
- Publication number 20230174705
- Publication date Jun 8, 2023
- COVESTRO DEUTSCHLAND AG
- Elisabeth Vogelsang
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHOD OF PREPARATION OF A POLYOL BLOCK COPOLYMER
- Publication number 20230147677
- Publication date May 11, 2023
- Econic Technologies Ltd.
- Michael Kember
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PROCESSES AND PRODUCTION PLANTS FOR PRODUCING POLYOLS
- Publication number 20230147479
- Publication date May 11, 2023
- Covestro LLC
- Jack R. Reese
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
SYNTHESIS METHOD OF POLYETHER FOR LOW-MODULUS SEALANT
- Publication number 20230131312
- Publication date Apr 27, 2023
- ZHEJIANG HUANGMA TECHNOLOGY CO., LTD.
- Weisong Wang
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
PROCESS FOR PRODUCING POLYETHER CARBONATE POLYOLS
- Publication number 20230069332
- Publication date Mar 2, 2023
- COVESTRO DEUTSCHLAND AG
- Stefanie Braun
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHOD FOR PRODUCING AN ETHER ESTEROL
- Publication number 20230065278
- Publication date Mar 2, 2023
- COVESTRO DEUTSCHLAND AG
- Martin Machat
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PREPARATION PROCESS OF ALLYL ALCOHOL POLYETHER WITH LOW POTASSIUM A...
- Publication number 20230054287
- Publication date Feb 23, 2023
- ZHEJIANG HUANGMA TECHNOLOGY CO., LTD.
- Weisong Wang
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PROCESS FOR PREPARING DOUBLE METAL CYANIDE CATALYSTS
- Publication number 20230046210
- Publication date Feb 16, 2023
- COVESTRO DEUTSCHLAND AG
- Joerg Hofmann
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
DOUBLE METAL CYANIDE CATALYST, PREPARATION METHOD THEREFOR, AND MET...
- Publication number 20230038470
- Publication date Feb 9, 2023
- Pusan National University Industry-University Cooperation Foundation
- Il KIM
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHOD FOR PRODUCING DOUBLE METAL CYANIDE CATALYSTS
- Publication number 20230038100
- Publication date Feb 9, 2023
- COVESTRO DEUTSCHLAND AG
- Joerg HOFMANN
- C01 - INORGANIC CHEMISTRY
Information Patent Application
A POLYOL BLOCK COPOLYMER
- Publication number 20230033621
- Publication date Feb 2, 2023
- Econic Technologies Ltd.
- James Leeland
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
ALKOXYLATED SECONDARY ALCOHOL
- Publication number 20230024429
- Publication date Jan 26, 2023
- Arkema France
- Jean-Philippe Gillet
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHOD FOR PRODUCING POLYETHER CARBONATE POLYOLS
- Publication number 20220315698
- Publication date Oct 6, 2022
- COVESTRO DEUTSCHLAND AG
- Joerg Hofman
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
NOVEL IN-SITU FORMED POLYOLS, A PROCESS FOR THEIR PREPARATION, FOAM...
- Publication number 20220289897
- Publication date Sep 15, 2022
- Covestro LLC
- Sharlene A. Lewis
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
METHOD FOR PREPARING POLYETHER CARBONATE POLYOLS
- Publication number 20220227928
- Publication date Jul 21, 2022
- Covestro Intellectual Property GmbH & Co. KG
- Kai Laemmerhold
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
A POLYOL BLOCK COPOLYMER, COMPOSITIONS AND PROCESSES THEREFOR
- Publication number 20220227926
- Publication date Jul 21, 2022
- Econic Technologies Ltd.
- James Leeland
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
A POLYOL BLOCK COPOLYMER, COMPOSITIONS AND PROCESSES THEREFOR
- Publication number 20220227925
- Publication date Jul 21, 2022
- Econic Technologies Ltd.
- James Leeland
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PROCESS FOR THE CONTINUOUS PRODUCTION OF POLYOXYALKYLENE POLYOLS
- Publication number 20220204691
- Publication date Jun 30, 2022
- Covestro Intellectual Property GmbH & Co. KG
- Joerg Hofmann
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PROCESS FOR PRODUCING POLYOXYMETHYLENE-POLYALKYLENE OXIDE BLOCK COP...
- Publication number 20220119579
- Publication date Apr 21, 2022
- Covestro Intellectual Property GmbH & Co. KG
- Markus Meuresch
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Application
PROCESS FOR PRODUCING DIOL
- Publication number 20220112172
- Publication date Apr 14, 2022
- Covestro Intellectual Property GmbH & Co. KG
- Hartmut Nefzger
- C07 - ORGANIC CHEMISTRY
Information Patent Application
METHOD FOR PRODUCING A POLYESTER-POLYETHER POLYOL BLOCK COPOLYMER
- Publication number 20220056207
- Publication date Feb 24, 2022
- Covestro Intellectual Property GmbH & Co. KG
- Markus Meuresch
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...

Metal cyanide catalysts

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Polyether polymerization process

Process for the continuous production of polyoxyalkylene polyols

Continuous process for making polyether polyols

Method for producing double metal cyanide catalysts

Methods for forming polycarbonate ether polyols and high molecular...

Double metal cyanide catalyst for the production of polyether polyo...

Highly active double metal cyanide compounds

Polyether polymerization process

Polyether polymerization process

In-situ formed polyols, a process for their preparation, foams prep...

Catalyst complex

Semi-batch process for making polycarbonate polyols via copolymeriz...

Alkoxylated secondary alcohol

Polycarbonate based polyols

Alkylene oxide polymerization using a double metal cyanide catalyst...

Process for the preparation of polyether polyols

Process for making polyether diols

High resiliency polyurethane foams made with high functionality, hi...

Polyol compositions, a process for the production of these polyol c...

Process for preparing polyoxyalkylene polyols by the continuous add...

Method for the preparation of polyoxyalkylene polyols

Alkoxylation process using tubular reactor

Base-catalyzed, long-chain, active polyethers from short chain DMC-...

Method for producing polyether carbonate polyols

Method for preparing polyols

Process for preparing polyether polyol using DMC catalyst and conti...

Process for the production of polyoxymethylene block copolymers

Product-to-product process for preparation of low viscosity polyoxy...

Product-to-product process for preparation of low viscosity polyoxy...

Method to increase the resistance of double metal cyanide catalysts...

Patents Applicationslast 30 patents

PROCESS FOR PREPARING A POLYETHER POLYOL WITH A HIGH ETHYLENE OXIDE...

METHOD FOR PREPARING SURFACTANTS BY COPOLYMERISATION OF EPOXIDES AN...

NOVEL POLYETHERS ON THE BASIS OF 2,3-EPOXYBUTANE AND PROCESS FOR TH...

(POLY)OL BLOCK COPOLYMER

CURABLE COMPOSITION, AND CURED PRODUCT

Polyether Polymerization Process

MIXED-ACID MODIFIED ZINC-COBALT DOUBLE METAL CYANIDE CATALYST AND P...

LOW FOAMING HYDRAULIC FLUIDS HAVING BIODEGRADABLE POLYALKYLENE GLYC...

PROCESS FOR PRODUCING POLYOXYMETHYLENE-POLYOXYALKYLENE COPOLYMERS

PROCESS FOR PREPARING A POLYOXYALKYLENE CARBONATE POLYOL

METHOD OF PREPARATION OF A POLYOL BLOCK COPOLYMER

PROCESSES AND PRODUCTION PLANTS FOR PRODUCING POLYOLS

SYNTHESIS METHOD OF POLYETHER FOR LOW-MODULUS SEALANT

PROCESS FOR PRODUCING POLYETHER CARBONATE POLYOLS

METHOD FOR PRODUCING AN ETHER ESTEROL

PREPARATION PROCESS OF ALLYL ALCOHOL POLYETHER WITH LOW POTASSIUM A...

PROCESS FOR PREPARING DOUBLE METAL CYANIDE CATALYSTS

DOUBLE METAL CYANIDE CATALYST, PREPARATION METHOD THEREFOR, AND MET...

METHOD FOR PRODUCING DOUBLE METAL CYANIDE CATALYSTS

A POLYOL BLOCK COPOLYMER

ALKOXYLATED SECONDARY ALCOHOL

METHOD FOR PRODUCING POLYETHER CARBONATE POLYOLS

NOVEL IN-SITU FORMED POLYOLS, A PROCESS FOR THEIR PREPARATION, FOAM...

METHOD FOR PREPARING POLYETHER CARBONATE POLYOLS

A POLYOL BLOCK COPOLYMER, COMPOSITIONS AND PROCESSES THEREFOR

A POLYOL BLOCK COPOLYMER, COMPOSITIONS AND PROCESSES THEREFOR

PROCESS FOR THE CONTINUOUS PRODUCTION OF POLYOXYALKYLENE POLYOLS

PROCESS FOR PRODUCING POLYOXYMETHYLENE-POLYALKYLENE OXIDE BLOCK COP...

PROCESS FOR PRODUCING DIOL

METHOD FOR PRODUCING A POLYESTER-POLYETHER POLYOL BLOCK COPOLYMER