Polyurethane dispersions and films produced therewith

• US 20010053815A1
• Filed: 04/03/2001
• Published: 12/20/2001
• Est. Priority Date: 05/16/2000
• Status: Abandoned Application

• Current Assignee: Debkumar Bhattacharjee, Franklin E. Parks, William A. Koonce
• Original Assignee: Debkumar Bhattacharjee, Franklin E. Parks, William A. Koonce
• Inventors: Bhattacharjee, Debkumar, Koonce, William A., Parks, Franklin E.
• Application Number:
  US09/824,652
• Publication Number:
  US 20010053815A1
• Time in Patent Office: Days
• US Class Current: 524/839
• CPC Class Codes: C08G 18/0866 the dispersing or dispersed phase being an aqueous medium
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/302 Water
• CPC Class Codes: C08G 18/3225 Polyamines
• CPC Class Codes: C08G 18/3271 Hydroxyamines
• CPC Class Codes: C08G 18/4866 having a low unsaturation value
• CPC Class Codes: C08G 18/6674 with compounds of group C08G18/3203

Abstract

Aqueous polyurethane dispersions and films prepared therefrom are prepared from a nonionic polyurethane prepolymer and water. The nonionic polyurethane prepolymer is prepared from a diisocyanate and a low monol polyether polyol. Such dispersions and films have applicability in gloves, condoms, angioplasy balloons and the like.

Claims

1. A polyurethane film comprising a film prepared from an aqueous polyurethane dispersion, the dispersion being prepared from a nonionic polyurethane prepolymer and water, wherein the nonionic polyurethane prepolymer is prepared from a polyisocyanate and a low monol polyether polyol.

2. The polyurethane film according to

claim 1

wherein the dispersion is prepared in the presence of a surfactant and in the substantial absence of an organic solvent.

3. The polyurethane film according to

claim 1

wherein the low monol polyether polyol has a molecular weight of at least 3000 Daltons.

4. The polyurethane film according to

claim 1

wherein the low monol polyether polyol has a measured unsaturation of less than about 0.025 meq/g.

5. The polyurethane film according to

claim 1

wherein the polyisocyanate is an aromatic polyisocyanate selected from the group consisting of MDI, TDI and mixtures thereof.

6. The polyurethane film according to

claim 1

wherein the nonionic polyurethane prepolymer has an average practical functionality of less than about 2.1.

7. The polyurethane film according to

claim 1

wherein the nonionic polyurethane prepolymer has an isocyanate content of from about 1 to about 9 weight percent.

8. A glove prepared from the film of

claim 1

.

9. A process for preparing an aqueous polyurethane dispersion comprising

preparing a nonionic polyurethane prepolymer from a polyisocyanate and a low monol polyol;

and

admixing the nonionic polyurethane prepolymer with water.

10. The process according to

claim 9

wherein the dispersion is prepared in the presence of a surfactant and in the substantial absence of an organic solvent.

11. The process according to

claim 9

wherein the low monol polyether polyol has a molecular weight of at least 3000 Daltons.

12. The process according to

claim 9

wherein the low monol polyether polyol has a measured unsaturation of less than about 0.025 meq/g.

13. The process according to

claim 9

wherein the polyisocyanate is an aromatic polyisocyanate selected from the group consisting of MDI, TI)I and mixtures thereof.

14. An aqueous polyurethane dispersion prepared according to the process of

claim 9

.

15. The aqueous polyurethane dispersion according to

claim 14

, wherein the dispersion has a particle size of from 0.9 microns to 0.05 microns.

16. The aqueous polyurethane dispersion according to

claim 14

, wherein the dispersion has a solids content of from 5 to 60 weight percent.