Process for producing polyisocvanurate plastics having functionalized surfaces

Patent metadata

Field	Value
Publication number	US-2018162981-A1
Application number	US-201615568121-A
Country	US
Kind code	A1
Filing date	Apr 21, 2016
Priority date	Apr 21, 2015
Publication date	Jun 14, 2018
Grant date	—

Abstract

The invention relates to a process for producing polyisocyanurate plastics having a functionalized surface, comprising the following steps: a) providing a polyisocyanate composition A) containing monomeric and/or oligomeric polyisocyanates; b) catalytically trimerizing the polyisocyanate composition A) so as to obtain a bulk polyisocyanurate material as intermediate; c) surface functionalizing the intermediate by contacting at least one surface of the intermediate with at least one functionalizing reagent D); d) continuing the catalytic trimerization. The invention further relates to a polyisocyanurate plastic having a functionalized surface obtainable from the process of the invention.

First claim

1 .- 16 . (canceled)

17 . A process for producing polyisocyanurate plastics having a functionalized surface, comprising the following steps:
a) providing a polyisocyanate composition A) containing monomeric and/or oligomeric polyisocyanates; b) catalytically trimerizing the polyisocyanate composition A) so as to obtain a bulk polyisocyanurate material as intermediate; c) surface functionalizing the intermediate by contacting at least one surface of the intermediate with at least one functionalizing reagent D); d) continuing the catalytic trimerization.

18 . The process according to claim 17 , wherein the polyisocyanurate intermediate obtained in step b) has a viscosity sufficiently high that complete mixing does not take place in the course of contacting with the functionalizing reagent in step c), but at least an intact layer of the bulk polyisocyanurate material is instead conserved.

19 . The process according to claim 17 , wherein the catalytic trimerization in step b) is continued until a viscosity of at least 100 000 mPas or the gel point has been attained.

20 . The process according to claim 17 , wherein the catalytic trimerization in step b) is effected up to a conversion level at which more than 20% of isocyanate groups originally present in the polyisocyanate composition A) are present.

21 . The process according to claim 17 , wherein the continuation of the catalytic trimerization in step d) is effected up to a conversion level at which only at most 20% of isocyanate groups originally present in the polyisocyanate composition A) are present.

22 . The process according to claim 17 , wherein the contacting in step c) is effected by flow coating, dipping, spraying, printing, pipetting, roller coating, bar coating, scattering, vapour deposition and/or painting.

23 . The process according to claim 17 , wherein excess functionalizing reagent D) is removed between steps c) and d).

24 . The process according to claim 17 , wherein the functionalizing reagent D) is selected from the group consisting of compounds containing alcohol, thiol, amine, epoxide, anhydride, organic acid, isocyanate groups and mixtures thereof.

25 . The process according to claim 17 , wherein the polyisocyanate composition A) contains predominantly oligomeric polyisocyanates and is low in monomeric polyisocyanates, wherein said low in monomeric polyisocyanates wherein the polyisocyanate composition A) has a content of monomeric polyisocyanates of not more than 20% by weight, based on the weight of the polyisocyanate composition A).

26 . Process according to claim 25 , wherein the polyisocyanate composition A) has a content of monomeric polyisocyanates of not more than 15% by weight, based on the weight of the polyisocyanate composition A).

27 . Process according to claim 25 , wherein the polyisocyanate composition A) has a content of monomeric polyisocyanates of not more than 5% by weight, based on the weight of the polyisocyanate composition A).

28 . The process according to claim 17 , wherein the isocyanurate structure content in the polyisocyanate composition A) is at least 20 mol %, based on the sum total of the oligomeric structures from the group consisting of uretdione, isocyanurate, allophanate, biuret, iminooxadiazinedione and oxadiazinetrione structure present in the polyisocyanate composition A).

29 . The process according to claim 17 , wherein the polyisocyanate composition A) consists to an extent of at least 80% by weight, based on the weight of the polyisocyanate composition A), of monomeric diisocyanates and/or oligomeric polyisocyanates having exclusively aliphatically and/or cycloaliphatically bonded isocyanate groups, where the oligomeric polyisocyanates optionally have exclusively aliphatically and/or cycloaliphatically bonded isocyanate groups.

30 . The process according to claim 17 , wherein the polyisocyanate composition A) consists to an extent of at least 95% by weight, based on the weight of the polyisocyanate composition A), of monomeric diisocyanates and/or oligomeric polyisocyanates having exclusively aliphatically and/or cycloaliphatically bonded isocyanate groups, where the oligomeric polyisocyanates optionally have exclusively aliphatically and/or cycloaliphatically bonded isocyanate groups.

31 . The process according to claim 17 , wherein the oligomeric polyisocyanates consist of one or more oligomeric polyisocyanates formed from 1,4-diisocyanatobutane, 1,5-diisocyanatopentane, 1,6-diisocyanatohexane, isophorone diisocyanate or 4,4′-diisocyanatodicyclohexylmethane or mixtures thereof, and/or in that the monomeric polyisocyanates consist of one or more monomeric diisocyanates selected from 1,4-diisocyanatobutane, 1,5-diisocyanatopentane, 1,6-diisocyanatohexane, isophorone diisocyanate or 4,4′-diisocyanatodicyclohexylmethane or mixtures thereof.

32 . The process according to claim 17 , wherein the polyisocyanate composition A) has a mean NCO functionality of 2.0 to 5.0 and/or the polyisocyanate composition A) has a content of reactive isocyanate groups of 8% to 60% by weight, based on the weight of the polyisocyanate composition A).

33 . The process according to claim 17 , wherein the oligomeric polyisocyanates are selected from at least one oligomeric polyisocyanate having uretdione, isocyanurate, allophanate, biuret, iminooxadiazinedione or oxadiazinetrione structure or mixtures thereof.

34 . A polyisocyanurate plastic having a functionalized surface obtainable from the process according to claim 17 .

Assignees

• Covestro Deutschland Ag

Inventors

• Achten Dirk
• Laas Hans-Josef
• Mager Dieter
• Matner Mathias
• Hocke Heilo
• Tillack Jörg

Classifications

• C08G18/225

  of alkali or alkaline earth metals · CPC title

• C08G18/3821

  Carboxylic acids; Esters thereof with monohydroxyl compounds · CPC title

• C08G18/73

  acyclic · CPC title

• C08G18/792

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

• C08G18/022 Primary

  the polymeric products containing isocyanurate groups · CPC title