Aqueous polyurethane dispersions useful for preparing polymers with improved moisture resistance properties

• US 20030087567A1
• Filed: 12/19/2002
• Published: 05/08/2003
• Est. Priority Date: 12/18/1998
• Status: Active Grant

• Current Assignee: Douglas R. Moore
• Original Assignee: Douglas R. Moore
• Inventors: Moore, Douglas R.
• Granted Patent: US 6,864,312 B2
• Time in Patent Office: Days
• US Class Current: 442/79
• CPC Class Codes: C08G 18/0828 containing sulfonate groups or groups forming them
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• 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 18/3246 heterocyclic, the heteroatom being oxygen or nitrogen in the form of an amino group
• CPC Class Codes: C08G 18/36 Hydroxylated esters of higher fatty acids
• CPC Class Codes: C08G 18/4841 containing oxyethylene end groups
• CPC Class Codes: C08G 18/6629 with compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38
• CPC Class Codes: C08G 18/6696 with compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38
• CPC Class Codes: Y10T 428/23979 Particular backing structure or composition
• CPC Class Codes: Y10T 428/23986 With coating, impregnation, or bond
• CPC Class Codes: Y10T 442/2164 Coating or impregnation specified as water repellent
• CPC Class Codes: Y10T 442/2213 Coating or impregnation is specified as weather proof, water vapor resistant, or moisture resistant
• CPC Class Codes: Y10T 442/2221 Coating or impregnation is specified as water proof

Abstract

The present invention is a polyurethane dispersion that can be used to prepare polyurethane polymers which have moisture resistant properties. Moisture resistant polymers of the present invention are obtained by preparing the polymers from a polyurethane dispersion using a prepolymer formulation which includes an aliphatic mono, di or polyhydroxy compound which has an-aliphatic side chain substituent which contains from 5 to 30 carbon atoms.

Claims

1. An aqueous polyurethane dispersion comprising an isocyanate terminated prepolymer prepared from a formulation including a polyisocyanate and a polyol mixture, wherein the polyol mixture includes at least one aliphatic mono, di or polyhydroxy compound which has an aliphatic side chain substituent which contains from 5 to 30 carbon atoms and wherein the aliphatic mono, di or polyhydroxy compound which has an aliphatic side chain substituent is present at a concentration of from 0.5 to 10 weight percent of the polymer.

2. The aqueous polyurethane dispersion of claim 1 wherein the polyisocyanate is MDI.

3. The aqueous polyurethane dispersion of claim 1 wherein the aliphatic mono, di or polyhydroxy compound which has an aliphatic side chain substituent which contains from 5 to 30 carbon atoms is a glycerol monoester.

4. The aqueous polyurethane dispersion of claim 3 wherein the glycerol monoester is selected from the group consisting of glycerol monooleate, glycerol monobehenate, glycerol monotallate, glycerol monostearate, glycerol monopalmitate, trimethylolpropane monostearate, and mixtures thereof.

5. The aqueous polyurethane dispersion of claim 1 wherein the aliphatic mono, di or polyhydroxy compound which has an aliphatic side chain substituent which contains from 5 to 30 carbon atoms is present at a concentration of from 1.0 to 4.5 weight percent of the polymer.

6. The aqueous polyurethane dispersion of claim 5 wherein the aliphatic mono, di or polyhydroxy compound which has an aliphatic side chain substituent which contains from 5 to 30 carbon atoms is present at a concentration of from 1.5 to 2.5 weight percent of the polymer.

7. The aqueous polyurethane dispersion of claim 1 wherein the dispersion is prepared with an external surfactant.

8. The aqueous polyurethane dispersion of claim 7 wherein the external surfactant is a triethanolamine salt of dodecyl benzene sulfonic acid.

9. The aqueous polyurethane dispersion of claim 1 wherein the polyol mixture includes a polyether polyol.

10. The aqueous polyurethane dispersion of claim 1 wherein the dispersion is prepared in the substantial absence of an organic solvent.

11. The aqueous polyurethane dispersion of claim 1 wherein the dispersion is compounded with a filler.

12. The aqueous polyurethane dispersion of claim 11 wherein the filler is selected from the group consisting of milled glass, calcium carbonate, aluminum trihydrate, talc, bentonite, antimony trioxide, kaolin, fly ash, and mixtures thereof.

13. The aqueous polyurethane dispersion of claim 11 wherein the filler is calcium carbonate.

14. A moisture resistant polyurethane polymer comprising a polymer layer prepared by applying a layer of the polyurethane dispersion of claim 1 to a substrate and allowing the dispersion to cure.

15. A moisture resistant textile comprising:

a textile and adherent thereto a polymer of claim 14.