Dow Global Technolgoies LLC

Dow Portugal Produtos Quimicos, Sociedade Unipessoal, Lda

Dow, Portugal Produtos Quimicos, Sociedade Unipessoal

Brian L Cramm

Robert E Hefner, Jr

Ian A Tomlinson

Helge Braun

Armenio Costa

Abhishek Roy

Lauren M Huffman

Jr Robert E Hefner

Organic isocyanates are converted to ureas by heating in the presence of certain cobalt, magnesium, chromium and lanthanide series organometallic catalysts. The process requires no water or other reactants. The process is particularly useful for removing small quantities of monoisocyanates from a solvent stream recovered from a polyisocyanate manufacturing process. The urea compounds in some instances can be recycled back into the polyisocyanate manufacturing process and reacted with polyisocyanate compounds to form biurets.

Method for converting monoisocyanates to ureas

Monoisocyanate impurities are removed from a process stream obtained when solvent is separated from a polyisocyanate product. The monoisocyanates are reacted with amine compounds at specific molar ratios to produce ureas. The ureas can be discarded by burning, landfilling or otherwise. Alternatively the ureas can be recycled back into the polyisocyanate manufacturing process, where they are formed into biuret compounds that can remain with the polyisocyanate product.

Method for removing monoisocyanates from organic solution

Phenyl isocyanates are removed from a solvent stream obtained from an MDI and/or PMDI manufacturing process by reaction in the presence of a carbodiimidization catalyst to form the corresponding N,N-diphenylcarbodiimides. The N,N-diphenylcarbodiimides can be recycled into the MDI and/or PMDI manufacturing process where they can react with MDI and/or PMDI to form uretonimines. The uretonimines have at most minimal effect on the properties and usefulness of the MDI and/or PMDI product and so can be left in the MDI and/or PMDI product.

Phenyl isocyanate conversion process

A polymer comprising a sub-unit represented by Formula I: wherein:

Polymer including Troger'S base and isatin moieties and having intrinsic microporosity

A polymer including a sub-unit comprising a Troger's base moiety represented by: Formula (I) wherein L comprises an arylene group including at least one substituent group selected from: i) a crosslinking bond and ii) a functional group selected from at least one of: hydroxyl, phosphonic acid, carboxylic acid and sulfonic acid and their corresponding salt or ester; alkynyl, alkynyl ether, cyanate, epoxide, glycidyl ether or ester. 

Troger's base polymers having intrinsic microporosity

A copolymer including a repeating unit represented by Formula I: wherein: L is a divalent hydrocarbon group comprising from 1 to 12 carbon atoms; and L' is optional and when present is represented by Formula II: wherein: Y, Y&#x2032; and Y&#x2033; if present, are independently selected from: a carboxylic acid, sulfonic acid, phosphorous acid and phosphoric acid and their corresponding salt or ester; imino, amide, nitrile, hydrogen, hydroxyl and alkyl comprising from 1 to 6 carbon atoms; and A, A&#x2032; and A&#x2033; if present, are independently selected from an arylene moiety, with the proviso one or both Y&#x2033; and A&#x2033; may not be present. 

Isatin copolymers having intrinsic microporosity

A polymer of intrinsic microporosity having a repeating subunit including a spirobisindane imide moiety as illustrated below. 

Growing community of inventors

Lake Jackson, TX, United States of America

Brian L Cramm