Aqueous polyurea dispersions prepared by an emulsion polymerization process

• US 5,212,230 A
• Filed: 03/28/1991
• Issued: 05/18/1993
• Est. Priority Date: 03/28/1991
• Status: Expired due to Term

• Current Assignee: Miles, Inc. (Bayer AG)
• Original Assignee: Miles, Inc. (Bayer AG)
• Inventors: Markusch, Peter H., Sarpeshkar, Ashok M., Tirpak, Robin E.
• Primary Examiner(s): Michl, Paul R.
• Assistant Examiner(s): NILAND, PATRICK DENNIS
• Application Number:
  US07/677,011
• Time in Patent Office: 782 Days
• Field of Search: 524/591, 524/839, 524/589, 528/44, 528/60, 528/61, 528/65, 528/68
• US Class Current: 524/589
• CPC Class Codes: C08G 18/0866 the dispersing or dispersed phase being an aqueous medium
• CPC Class Codes: C08G 18/5024 containing primary and/or secondary amino groups
• CPC Class Codes: C08G 18/5048 Products of hydrolysis of polyether-urethane prepolymers containing isocyanate groups

Abstract

The present invention is directed to a process for the preparation of an aqueous polyurea dispersion by

a) dispersing in water at an NCO:NH equivalent ratio of 0.5:1.0 to 2.0:1.0

i) a polyisocyanate which has an average functionality of 1.5 to 4.0 and an isocyanate content of at least 12% by weight and

ii) a polyamine having at least two primary and/or secondary amino groups and a molecular weight of at least at an NCO:OH equivalent ratio of 0.5:1.0 to 2.0:1.01000 and

b) allowing the polyisocyanate and polyamine to react to form an aqueous polyurea dispersion.

The present invention is also directed to the aqueous polyurea dispersion prepared by this process.

Claims

1. A process for the preparation of an aqueous polyurea dispersion which comprises

a) dispersing in water at an NCO:

NH equivalent ratio of 0.5;

1.0 to 2.0;

1.0

i) a polyisocyanate which has an average functionality of 1.5 to 4.0 and an isocyanate content of at least 12% by weight and

ii) a polyamine having at least two primary and/or secondary amino groups and a molecular weight of at least 1000 and

b) allowing the polyisocyanate and polyamine to react to form an aqueous polyurea dispersion.

2. The process of claim 1 wherein said dispersed polyisocyanate was rendered hydrophilic by reaction with a compound containing a lateral or terminal nonionic hydrophilic group.

3. The process of claim 1 wherein said polyamine comprises an aminated polyether.

4. The process of claim 2 wherein said polyamine comprises an aminated polyether.

5. A process for the preparation of an aqueous polyurea dispersion which comprises

a) dispersing in water at an NCO:

NH equivalent ratio of 0.5;

1.0 to 2.0;

1.0

i) a polyisocyanate which has an average functionality of 1.5 to 2.5 and an isocyanate content of at least 12% by weight and

ii) a polyamine having at least two primary and/or secondary amino groups and a molecular weight of at least 1000 and

b) allowing the polyisocyanate and polyamine to react to form an aqueous polyurea dispersion.

6. The process of claim 5 wherein said dispersed polyisocyanate was rendered hydrophilic by reaction with a compound containing a lateral or terminal nonionic hydrophilic group.

7. The process of claim 5 wherein said polyamine comprises an aminated polyether.

8. The process of claim 6 wherein said polyamine comprises an aminated polyether.

9. An aqueous polyurea dispersion which is prepared by a process which comprises

a) dispersing in water at an NCO:

NH equivalent ratio of 0.5;

1.0 to 2.0;

1.0

i) a polyisocyanate which has an average functionality of 1.5 to 4.0 and an isocyanate content of at least 12% by weight and

ii) a polyamine having at least two primary and/or secondary amino groups and a molecular weight of at least 1000 and

b) allowing the polyisocyanate and polyamine to react to form an aqueous polyurea dispersion.

10. The dispersion of claim 9 wherein said dispersed polyisocyanate was rendered hydrophilic by reaction with a compound containing a lateral or terminal nonionic hydrophilic group.

11. The dispersion of claim 9 wherein said polyamine comprises an aminated polyether.

12. The dispersion of claim 10 wherein said polyamine comprises an aminated polyether.

13. An aqueous polyurea dispersion which is prepared by a process which comprises

a) dispersing in water at an NCO:

NH equivalent ratio of 0.5;

1.0 to 2.0;

1.0

i) a polyisocyanate which has an average functionality of 1.5 to 2.5 and an isocyanate content of at least 12% by weight and

ii) a polyamine having at least two primary and/or secondary amino groups and a molecular weight of at least 1000 and

b) allowing the polyisocyanate and polyamine to react to form an aqueous polyurea dispersion.

14. The dispersion of claim 13 wherein said dispersed polyisocyanate was rendered hydrophilic by reaction with a compound containing a lateral or terminal nonionic hydrophilic group.

15. The dispersion of claim 13 wherein said polyamine comprises an aminated polyether.

16. The dispersion of claim 14 wherein said polyamine comprises an aminated polyether.