Adhesives

• US 20080171208A1
• Filed: 12/10/2007
• Published: 07/17/2008
• Est. Priority Date: 12/12/2006
• Status: Abandoned Application

• Current Assignee: Bayer Materialscience AG (Covestro AG)
• Original Assignee: Bayer Materialscience AG (Covestro AG)
• Inventors: Pires, Raul, Henning, Wolfgang, Arndt, Wolfgang, Gurtler, Christoph, Buchner, Jorg
• Application Number:
  US12/001,158
• Publication Number:
  US 20080171208A1
• Time in Patent Office: Days
• US Class Current: 428/423.1
• CPC Class Codes: C08G 18/222 metal compounds not provided for in groups C08G18/225 - C08G18/26
• CPC Class Codes: C08G 18/4238 derived from dicarboxylic acids and dialcohols
• CPC Class Codes: C08G 18/5024 containing primary and/or secondary amino groups
• CPC Class Codes: C08G 18/722 Combination of two or more aliphatic and/or cycloaliphatic polyisocyanates
• CPC Class Codes: C08G 18/792 formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
• CPC Class Codes: C08G 2170/80 Compositions for aqueous adhesives
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]

Abstract

The invention relates to adhesives based on aqueous dispersions and surface-deactivated isocyanate particles and to latently reactive coatings, films and powders produced from such dispersions. The adhesives are prepared from aqueous compositions containing a) dispersed polymers with isocyanate-reactive groups; b) at least one dispersed surface-deactivated aliphatic solid polyisocyanate with a softening temperature of ≧40° C.; c) one or more compounds of elements from subgroups 5 and 6 of the periodic system of elements, in which the particular element has an oxidation number of at least +4 and, d) optionally further additives and auxiliaries.

Claims

1. Aqueous compositions containing

a) dispersed polymers with isocyanate-reactive groups

b) at least one surface-deactivated aliphatic solid polyisocyanate suspended in water, with a softening temperature of ≧

40°

C.,

c) one or more compounds of elements from subgroups 5 and 6 of the periodic system of elements, in which the particular element has an oxidation number of at least +4 and,

d) optionally further additives and auxiliaries.

2. A composition according to claim 1, wherein the dispersed isocyanate-reactive polymer contains urethane and urea groups.

3. A composition according to claim 1, wherein the isocyanate-reactive polymer has crystallising polymer units.

4. A composition according to claim 1, wherein the isocyanate-reactive polymer has crystallising polyester soft segments as the crystallising polymer units.

5. A composition according to claim 1, wherein the aliphatic solid isocyanates exhibit a particle size of d50<

100 μ

m.

6. A composition according to claim 1, wherein the aliphatic solid isocyanates exhibit a particle size of d50<

2 μ

m.

7. A composition according to claim 1, wherein the aliphatic solid isocyanate is IPDI trimer.

8. A composition according to claim 1, wherein at least one compound of the elements molybdenum and vanadium is used as component (c).

9. A composition according to claim 1, wherein at least one compound of the element molybdenum is used as component (c).

10. A composition according to claim 1, wherein lithium molybdate is used as component (c).

11. A method for producing compositions according to claim 1, wherein component (c) is premixed in the aqueous phase of the dispersed polymer (a).

12. A method for producing compositions according to claim 1, wherein component (c) is premixed in the formulation of the aliphatic solid isocyanate (b).

13. A method for producing compositions according to claim 1, wherein component (c) is premixed in further additives and auxiliary substances (d).

14. A method for producing compositions according to claim 1, wherein component (c) is added to the aqueous phase of the formulation consisting of the dispersed polymer (a), the surface-deactivated aliphatic solid isocyanate (b) and optionally added additives and auxiliary substances.

15. A method for producing latently reactive coatings from the compositions according to claim 1, wherein the compositions are applied onto substrate surfaces and are dried.

16. A method for producing backing-free latently reactive films or nonwovens from the compositions according to claim 1, wherein the compositions are applied onto release paper, dried and removed from the release paper.

17. A method for producing latently reactive powders from the compositions according to claim 1, wherein the solid constituents of the formulations are precipitated and separated, or are obtained by drying the aqueous dispersion and, optionally, are then micronised.

18. An adhesive comprising the compositions according to claim 1.

19. Backing-free films and nonwovens comprising the compositions of claim 1.

20. Adhesive powders comprising the compositions of claim 1.

21. Substrates adhesively bonded by compositions according to claim 1.