Blocked polyisocyanate composition based on pentamethylene 1,5-diisocyanate

Patent metadata

Field	Value
Publication number	US-11091584-B2
Application number	US-201615747790-A
Country	US
Kind code	B2
Filing date	Jul 20, 2016
Priority date	Jul 31, 2015
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

The present invention relates to a polyisocyanate composition comprising a formation component having isocyanate groups, the isocyanate groups having been reacted to an extent of ≥98% with at least one CH-acidic compound, characterized in that the formation component consists to an extent of ≥51% by weight of at least one polyisocyanate based on pentamethylene 1,5-diisocyanate having a content of isocyanurate trimer of ≤60 area %, based on the total weight of the polyisocyanates based on pentamethylene 1,5-diisocyanate, and the remaining proportion up to 100% by weight of the total amount of polyisocyanates present in the formation component consists of at least one aliphatic or cycloaliphatic polyisocyanate. The present invention further provides a one-component system comprising the polyisocyanate composition, a process for producing a coating on a substrate, and the coatings obtainable from the one-component system.

First claim

The invention claimed is:

1. A polyisocyanate composition comprising a formation component having isocyanate groups reacted to an extent of >98% with at least one CH-acidic compound,
the formation component consisting of from ≥51% by weight of at least one polyisocyanate based on 1,5-pentamethylene diisocyanate having a content of isocyanurate trimer of from ≥36 area % to ≤60 area % determined by gel permeation chromatography (GPC) in accordance with DIN 55672-1, and at least 5% by weight of at least one aliphatic or cycloaliphatic polyisocyanate which differs from the at least one polyisocyanate based on 1,5-pentamethylene diisocyanate,
wherein the percents by weight total 100% and are based on the total amount of polyisocyanates present in the formation component.

2. The polyisocyanate composition according to claim 1 , wherein the formation component consists of at least 60% by weight, of at least one polyisocyanate based on 1,5-pentamethylene diisocyanate having a content of isocyanurate trimer of ≤60 area %, based on the total weight of the polyisocyanates based on 1,5-pentamethylene diisocyanate.

3. The polyisocyanate composition according to claim 1 , wherein the content of isocyanurate trimer is ≥36 area % and ≤56 area % by gel permeation chromatography (GPC) in accordance with DIN 55672-1, based on the total weight of the polyisocyanates based on 1,5-pentamethylene diisocyanate.

4. The polyisocyanate composition according to claim 1 , characterized in that the CH-acidic compound is selected from the group consisting of Meldrum's acid, diethyl malonate, dimethyl malonate, methyl acetoacetate, ethyl acetoacetate, di-tert-butyl malonate, 1-tert-butyl 3-methyl malonate, tert-butyl acetoacetate, 2-acetylacetoxyethyl methacrylates, acetylacetone, cyanoethyl acetate and cyclopentanone-2-carboxymethyl ester, cyclopentanone-2-carboxyethyl ester, cyclohexanone-2-carboxymethyl ester and cyclohexanone-2-carboxyethyl ester.

5. The polyisocyanate composition according to claim 4 , wherein at least one of the diethyl malonate and the ethyl acetoacetate have been produced from renewable raw materials.

6. The polyisocyanate composition according to claim 1 , wherein the polyisocyanate composition is free of crystallization inhibitors.

7. The polyisocyanate composition according to claim 1 , wherein the polyisocyanate composition comprises at least one organic solvent.

8. In a process for producing a one-component system, the improvement comprising including the polyisocyanate composition according to claim 1 .

9. A one-component system comprising at least one polyisocyanate composition according to claim 1 , at least one polyol, at least one leveling agent and optionally further auxiliaries and additives.

10. A process for producing a coating on a substrate, in which a one-component system according to claim 9 is applied to the substrate and is cured at a temperature of >80° C. and <130° C.

11. A coating, produced or which can be produced by a process according to claim 10 .

12. A composite comprising a coating according to claim 11 and a substrate having a surface of at least one of metal and plastic.

Assignees

• Covestro Deutschland Ag

Inventors

• Hecking Andreas
• Stempfle Florian Johannes
• Eggert Christoph
• Grahl Michael
• Greszta-Franz Dorota

Classifications

• C08G18/6229 Primary

  Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols · CPC title

• C08G18/791 Primary

  containing isocyanurate groups · CPC title

• C08G18/2895

  Compounds containing active methylene groups · CPC title

• C09D175/04

  Polyurethanes · CPC title

• C08G18/246

  containing also tin-carbon bonds · CPC title