Method and system for producing a polyurethane polymer by means of a supported catalyst

Patent metadata

Field	Value
Publication number	US-2020407484-A1
Application number	US-201916976118-A
Country	US
Kind code	A1
Filing date	Feb 25, 2019
Priority date	Feb 27, 2018
Publication date	Dec 31, 2020
Grant date	—

Abstract

A process for preparing a polyurethane polymer comprises the step of:
I) mixing a first component ( 100 ) comprising a polyisocyanate with a second reactant component ( 200 ) comprising a compound having Zerewitinoff-active hydrogen atoms in a mixing vessel ( 300 ) to obtain a reaction mixture ( 400 ), wherein the first reactant component ( 100 ) and/or the second reactant component ( 200 ) are contacted with a catalyst bed ( 500 ) before they are mixed in the mixing vessel ( 300 ) and/or the reaction mixture ( 400 ) is contacted with a catalyst bed ( 500 ), wherein the catalyst bed ( 500 ) contains a catalyst reversibly sorbed on a substrate, the catalyst catalyses the reaction of isocyanate groups with themselves or with Zerewitinoff-active compounds and the catalyst is released into the first component ( 100 ), second component ( 200 ) or reaction mixture ( 400 ) that is in contact with the catalyst bed ( 500 ), such that a reaction mixture ( 410 ) containing the catalyst is obtained.

First claim

1 .- 15 . (canceled)

16 . A process for preparing a polyurethane polymer, comprising the step of:
I) mixing a first reactant component comprising a polyisocyanate with a second reactant component comprising a compound having Zerewitinoff-active hydrogen atoms in a mixing vessel to obtain a reaction mixture, wherein the first reactant component and/or the second reactant component are contacted with a catalyst bed before they are mixed in the mixing vessel and/or the reaction mixture is contacted with a catalyst bed, wherein the catalyst bed contains a catalyst reversibly sorbed on a substrate, the catalyst catalyses the reaction of isocyanate groups with themselves or with Zerewitinoff-active compounds, and the catalyst is released into the first component, second component or reaction mixture that is in contact with the catalyst bed, such that a reaction mixture containing the catalyst is obtained.

17 . The process according to claim 16 , wherein:
a stream of the first reactant component is combined with a stream of the second reaction component in a mixer to obtain a stream of the reaction mixture and at least one stream selected from the stream of the first reactant component, the stream of the second reactant component and the stream of the reaction mixture flows through the catalyst bed, such that the catalyst is released into the stream that flows through the catalyst bed.

18 . The process according to claim 16 , wherein the catalyst is released in such a way that the reaction mixture containing the catalyst contains the catalyst in a proportion of ≥1 ppm to ≤5000 ppm, based on the weight of the reaction mixture.

19 . The process according to claim 16 , wherein the reaction mixture comes into contact with the catalyst bed, and the first and second reactant components do not come into contact with the catalyst bed.

20 . The process according to claim 16 , wherein the first and second reactant components do not contain any catalyst before being mixed in the mixing vessel.

21 . The process according to claim 16 , wherein the substrate in the catalyst bed comprises particles having channels that have an extent of ≥1 angström to ≤50 angströms in at least one spatial direction.

22 . The process according to claim 16 , wherein the catalyst selected is dimethyltin dilaurate, dibutyltin dilaurate, dioctyltin dilaurate, tin bis(dodecylmercaptide), tin bis(2-ethylhexylthioglycolate), tin diacetate, tin maleate, bisthioglyceroltin, octyltin tris(2-ethylhexylthioglycolate), bis(β-methoxycarbonylethyl)tin dilaurate, tetraisopropyl titanate, tetra-tert-butyl orthotitanate, tetra(2-ethylhexyl)titanium and bis(ethylacetoacetato)titanium diisopropoxide, bismuth(III) tris(2-ethylhexanoate), bismuth laurate or mixtures thereof.

23 . The process according to claim 16 , wherein the catalyst bed is in the form of at least one exchangeable cartridge.

24 . The process according to claim 16 , wherein the catalyst bed is in the form of a multitude of mutually fluidically sealed channels which contain substrates and catalysts sorbed thereon, and through which the first reactant component, the second reactant component or the reaction mixture flows independently of one another on instruction by a control unit.

25 . The process according to claim 16 , wherein the catalyst bed has been purged with a solvent prior to commencement of the process.

26 . A system for preparation of a polyurethane polymer, comprising a mixing vessel for mixing of a first and second reactant component to obtain a reaction mixture,
wherein the system has at least one catalyst bed with which the first or second reactant component comes into contact before it enters the mixing vessel and/or which is contacted by the reaction mixture before it leaves the mixing vessel, and wherein the catalyst bed contains a catalyst sorbed reversibly on a substrate for catalysis of the reaction of isocyanate groups with themselves or with Zerewitinoff-active compounds.

27 . The system according to claim 26 , wherein the catalyst bed is in the form of at least one exchangeable cartridge.

28 . The system according to claim 26 , wherein the catalyst bed is in the form of a multitude of mutually fluidically sealed channels which contain substrates and catalysts sorbed thereon, and through which the first reactant component, the second reactant component or the reaction mixture flows independently of one another on instruction by a control unit.

29 . The system according to claim 26 , wherein the system is designed as a spray gun with a conduit ( 320 ) for transport of the reaction mixture out of the mixing vessel to a nozzle and the catalyst bed is disposed in said conduit.

30 . The system according to claim 26 , wherein the mixing vessel is designed as a mixing head that mixes a stream of the first reactant component with a stream of second reactant component to obtain a stream of the reaction mixture and
at least one stream selected from the stream of the first reactant component, the stream of the second reactant component and a stream of the reaction mixture flows through the catalyst bed, such that the catalyst is released into the stream that flows through the catalyst bed.

Assignees

• Covestro Intellectual Property Gmbh & Co Kg

Inventors

• Weikard Jan
• Mundstock Holger
• Huertgen Dagmar
• Yelkaya Goenuel-Hava
• Schreiber Marc

Classifications

• C08G18/792

  formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates · CPC title

• C08G18/227

  of antimony, bismuth or arsenic · CPC title

• B01J8/004

  by means of a nozzle · CPC title

• B01J8/001

  Controlling catalytic processes (B01J8/1809 takes precedence) · CPC title

• C08G18/6225 Primary

  Polymers of esters of acrylic or methacrylic acid · CPC title