Aqueous compositions containing an at least partially blocked polyisocyanates and a trimerization catalyst and coatings and binders prepared therefrom

• US 5,157,074 A
• Filed: 07/23/1991
• Issued: 10/20/1992
• Est. Priority Date: 07/23/1991
• Status: Expired due to Term

• Current Assignee: Miles, Inc. (Bayer AG)
• Original Assignee: Miles, Inc. (Bayer AG)
• Inventors: Metzger, Sidney H., Rosthauser, James W., Tirpak, Robin E.
• Primary Examiner(s): WELSH JR, MAURICE
• Application Number:
  US07/734,384
• Time in Patent Office: 455 Days
• Field of Search: 524/589, 524/590, 524/591, 524/839, 427/389.8
• US Class Current: 524/589
• CPC Class Codes: C03C 25/26 Macromolecular compounds or prepolymers
• CPC Class Codes: C03C 25/326 Polyureas; Polyurethanes
• CPC Class Codes: C08G 18/0804 Manufacture of polymers containing ionic or ionogenic groups
• CPC Class Codes: C08G 18/092 oligomerisation to isocyanurate groups
• CPC Class Codes: C08G 18/283 Compounds containing ether groups, e.g. oxyalkylated monohydroxy compounds
• CPC Class Codes: C08G 18/302 Water
• CPC Class Codes: C08G 18/703 Isocyanates or isothiocyanates transformed in a latent form by physical means
• CPC Class Codes: C08G 18/8077 Oximes

Abstract

The present invention relates to an aqueous composition containing

a) an at least partially blocked, aqueously dispersed polyisocyanate

i) having an isocyanate content prior to blocking of at least 12% by weight, based on the weight of the unblocked polyisocyanate and

ii) containing at least 2 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups, and

b) a trimerization catalyst.

The present invention also relates to coatings or binders prepared by heating the aqueous compositions to evaporate water and initiate trimerization.

Claims

1. An aqueous composition containing

a) an at least partially blocked, aqueously dispersed polyisocyanate

i) having an isocyanate content prior to blocking of at least 12% by weight, based on the weight of the unblocked polyisocyanate and

ii) containing at least 2 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups, and

b) a trimerization catalyst.

2. The composition of claim 1 wherein said monofunctional blocking agent comprises an oxime which corresponds to the formula

3. The composition of claim 1 wherein said polyisocyanate is rendered hydrophilic by reaction with a compound containing a lateral or terminal nonionic hydrophilic group.

4. The composition of claim 1 wherein said polyisocyanate contains at least 60 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups.

5. The composition of claim 2 wherein said polyisocyanate contains at least 60 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups.

6. The composition of claim 3 wherein said polyisocyanate contains at least 60 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups.

7. An aqueous composition containing

a) an at least partially blocked, aqueously dispersed polyisocyanate

i) having an isocyanate content prior to blocking of at least 12% by weight, based on the weight of the unblocked polyisocyanate and

ii) containing at least 2 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups, and

b) a trimerization catalyst comprising a member selected from the group consisting alkali metal carboxylates and alkali metal hydroxides.

8. The composition of claim 7 wherein said monofunctional blocking agent comprises an oxime which corresponds to the formula

9. The composition of claim 7 wherein said polyisocyanate is rendered hydrophilic by reaction with a compound containing a lateral or terminal nonionic hydrophilic group.

10. The composition of claim 7 wherein said polyisocyanate contains at least 60 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups.

11. The composition of claim 8 wherein said polyisocyanate contains at least 60 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups.

12. The composition of claim 9 wherein said polyisocyanate contains at least 60 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups.

13. A process for the preparation of a fiberglass mat which comprises treating fiberglass with an aqueous composition containing

a) an at least partially blocked, aqueously dispersed polyisocyanate

i) having an isocyanate content prior to blocking of at least 12% by weight, based on the weight of the unblocked polyisocyanate and

ii) containing at least 2 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups, and

b) a trimerization catalyst.

14. The process of claim 13 wherein said monofunctional blocking agent comprises an oxime which corresponds to the formula

15. The process of claim 13 wherein said polyisocyanate is rendered hydrophilic by reaction with a compound containing a lateral or terminal nonionic hydrophilic group.

16. The process of claim 13 wherein said polyisocyanate contains at least 60 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups.

17. The process of claim 14 wherein said polyisocyanate contains at least 60 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups.

18. The process of claim 15 wherein said polyisocyanate contains at least 60 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups.

19. A process for the preparation of a fiberglass mat which comprises treating fiberglass with an aqueous composition containing

a) an at least partially blocked, aqueously dispersed polyisocyanate

i) having an isocyanate content prior to blocking of at least 12% by weight, based on the weight of the unblocked polyisocyanate and

ii) containing at least 2 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups, and

b) a trimerization catalyst comprising a member selected from the group consisting alkali metal carboxylates and alkali metal hydroxides.

20. The process of claim 19 wherein said monofunctional blocking agent comprises an oxime which corresponds to the formula

21. The process of claim 19 wherein said polyisocyanate is rendered hydrophilic by reaction with a compound containing a lateral or terminal nonionic hydrophilic group.

22. The process of claim 19 wherein said polyisocyanate contains at least 60 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups.

23. The process of claim 20 wherein said polyisocyanate contains at least 60 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups.

24. The process of claim 21 wherein said polyisocyanate contains at least 60 equivalent percent, based on the total equivalents of isocyanate groups, of blocked isocyanate groups.