Polymer dispersions having nanosized polyurea particles dispersed in a polyether

Patent metadata

Field	Value
Publication number	US-2016311965-A1
Application number	US-201415103263-A
Country	US
Kind code	A1
Filing date	Dec 11, 2014
Priority date	Dec 19, 2013
Publication date	Oct 27, 2016
Grant date	—

Abstract

Dispersions of polyurea particles are made by reacting polyisocyanate compounds and coreactants that include at least one polyamine while dispersed in a base polyether. The polyisocyanate or the polyamine, or both, has a functionality of at least 2. A highly preferred coreactant is an alkylthio-substituted aromatic diamine such as 3,5-di(methylthio)-2,4-toluene diamine. The dispersions have extremely small particles, which promotes storage stability.

First claim

1 . A process for preparing a dispersion of polyurea polymer particles in a base polyether, comprising (I) forming an agitated mixture of (i) one or more polyisocyanate compounds, (ii) one or more coreactants that includes at least one polyamine compound having an equivalent weight per primary and/or secondary amine group of up to 200, and a base polyether having a molecular weight of at least 600, provided that the polyisocyanate compound(s) have an average functionality of at least 2.4 and/or the polyamine compound(s) contain an average of at least 2.4 primary and/or secondary amino groups, and (II) reacting the coreactant(s) with the polyisocyanate compound(s) in the presence of the base polyether, to form the dispersion of polyurea particles in the base polyether.

2 . The process of claim 1 wherein the polyisocyanate compounds have an average functionality of at least 2.8.

3 . The process of claim 2 wherein the polyisocyanate compound is a mixture of one or more methylene diphenylisocyanates and one or more polymethylene polyphenylisocyanates.

4 . The process of claim 2 wherein the polyamine compound(s) constitute at least 50 mole percent of the coreactants.

5 . The process of claim 2 wherein the polyamine compound(s) have an average functionality of at least 2.8.

6 . The process of claim 2 wherein the coreactants include at least one monoamine, polyol or aminoalochol.

7 . The process of claim 6 wherein the monoamine, polyol or aminoalcohol is selected from ethyl amine, propyl amine, butyl amine, hexyl amine, cyclohexyl amine, polyether monoamines, triethanolamine, diethanolamine, monoethanolamine, triisopropanolamine, diisopropanol amine, monoisopropanolamine, aminobutanol, polyoxypropylene monoamines, glycerin, trimethylolpropane, ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, dipropylene glycol, erythritol and pentaerythritol.

8 . The process of claim 2 wherein at least 50% by weight of the coreactants is a dialkylthio-substituted aromatic diamine.

9 . The process of claim 8 wherein the (alkylthio)-substituted aromatic diamine has the structure:

wherein x is a number of at least 1, R represents an inertly substituted alkyl group and Ar represents an aromatic ring structure, and further wherein each R—S— group and each —NH 2 group is bonded directly to an aromatic ring carbon of the Ar group.

10 . The process of claim 9 wherein the (alkylthio)-substituted aromatic diamine is 3,5-di(methylthio)-2,4-toluene diamine.

11 . The process of claim 2 wherein the base polyether has an average of at least 2 hydroxyl groups and a hydroxyl equivalent weight of at least 300.

12 . The process of claim 2 wherein the dispersion has a solids content of 8-25% by weight.

13 . The process of claim 2 wherein at least 90 volume-% of the dispersed particles in the product dispersion have a particle size of 15 to 500 nm.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Shen Hongwei
• Even Ralph C

Classifications

• C08G18/0876

  the dispersing or dispersed phase being a polyol · CPC title

• C08G18/10

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title

• C08G18/7664

  containing alkylene polyphenyl groups · CPC title

• C08G18/4841 Primary

  containing oxyethylene end groups · CPC title

• C08G18/324

  containing only one aromatic ring · CPC title