CA1129128A — Process for the preparation of aqueous polyureth…

Claim 1

Independent Claim 172 words

A process for the preparation of aqueous solutions or dispersions of polyurethane polyureas by the reaction of (1) prepolymers which have at least two free isocyanate groups and contain chemically fixed hydrophilic groups or external emulsifiers which are not chemically fixed with (2) organic compounds containing at least two groups selected from the group consisting of primary and secondary amino groups characterized in that the isocyanate-containing prepolymer component (1), which is hydrophilically modified or contains an external emulsifier, is mixed, in the absence of water, with the organic compound component (2) which contains at least two groups selected from the group consisting of primary and secondary amino groups wherein at most one amino group is a free primary or secondary amino group and at least one amino group is a blocked amino group which is substantially inert toward isocyanate groups at room temperature in the absence of moisture and which releases a free primary or secondary amino group in the presence of water, and the mixture obtained is subsequently mixed with water.

Claim 2

Dependent Claim 172 words

A process for the preparation of aqueous solutions or dispersions of polyurethane polyureas by the reaction of (1) prepolymers which have at least two free isocyanate groups and contain chemically fixed hydrophilic groups or external emulsifiers which are not chemically fixed with (2) organic compounds containing at least two groups selected from the group consisting of primary and secondary amino groups characterized in that the isocyanate-containing prepolymer component (1), which is hydrophilically modified or contains an external emulsifier, is mixed, in the absence of water, with the organic compound component (2) which contains at least two groups selected from the group consisting of primary and secondary amino groups wherein at most one amino group is a free primary or secondary amino group and at least one amino group is a blocked amino group which is substantially inert toward isocyanate groups at room temperature in the absence of moisture and which releases a free primary or secondary amino group in the presence of water, and the mixture obtained is subsequently mixed with water.

Claim 3

Dependent Claim 46 words

The process according to Claim 1, characterized in that the nature and proportions of the reactants are chosen so that from about 0.25 to 1.5 free plus blocked amino groups which are reactive with isocyanate groups are present for each isocyanate group of the isocyanate prepolymer.

Claim 4

Dependent Claim 19 words

Polyurethane polyurea aqueous dispersions or solutions obtainable according to the processes of Claims 1 or 2. LeA 18,150-Ca -36-

Claim 5

Dependent Claim 35 words

In a process for coating substrates with aqueous polyurethane polyurea solutions or dispersions, the improvement comprising coating said substrates with aqueous polyurethane polyurea solutions or dispersions produced by the processes of Claims 1 or 2.

Claim 6

Dependent Claim 226 words

A process for the production of an aqueous solution or dispersion of a polyurethane polyurea comprising mixing in the absence of water (a) a hydrophilic NCO-prepolymer having (i) an average isocyanate functionality of from about 1.8 to 2.2. (ii) an average molecular weight of from about 500 to 10,000, and (iii) its hydrophilic properties contributed by dispersing centers selected from the group consisting of chemically incor-porated cationic or anionic groups pre-sent in said NCO-prepolymer in from about 0.1 to 100 milliequivalents per 100 g of NCO-prepolymer, chemically in-corporated ethylene oxide units present in said NCO-prepolymer in from about 0.5 to 30% by weight, based on the weight of the NCO polymer, and external emulsifiers present in about 1 to 30% by weight, based on the weight of the NCO-prepolymer, with LeA 18,150 -37_ (b) a polyamine having (i) at least two amino groups selected from the group consisting of primary amino groups and secondary amino groups, (ii) at most one free primary or secondary amino group, (iii) at least one blocked amino group which is substantially inert toward isocyanate groups at room temperature in the absence of moisture and which releases a free primary or secondary amino group in the presence of water, and (iv) a molecular weight of from about 60 to 500, and subsequently mixing the mixture of components (a) and (b) with water.

Claim 7

Dependent Claim 226 words

A process for the production of an aqueous solution or dispersion of a polyurethane polyurea comprising mixing in the absence of water (a) a hydrophilic NCO-prepolymer having (i) an average isocyanate functionality of from about 1.8 to 2.2. (ii) an average molecular weight of from about 500 to 10,000, and (iii) its hydrophilic properties contributed by dispersing centers selected from the group consisting of chemically incor-porated cationic or anionic groups pre-sent in said NCO-prepolymer in from about 0.1 to 100 milliequivalents per 100 g of NCO-prepolymer, chemically in-corporated ethylene oxide units present in said NCO-prepolymer in from about 0.5 to 30% by weight, based on the weight of the NCO polymer, and external emulsifiers present in about 1 to 30% by weight, based on the weight of the NCO-prepolymer, with LeA 18,150 -37_ (b) a polyamine having (i) at least two amino groups selected from the group consisting of primary amino groups and secondary amino groups, (ii) at most one free primary or secondary amino group, (iii) at least one blocked amino group which is substantially inert toward isocyanate groups at room temperature in the absence of moisture and which releases a free primary or secondary amino group in the presence of water, and (iv) a molecular weight of from about 60 to 500, and subsequently mixing the mixture of components (a) and (b) with water.

Claim 8

Dependent Claim 23 words

The process of Claim 5 wherein the blocked amino groups are blocked with compounds selected from the group consisting of aldehydes and ketones.

Claim 9

Dependent Claim 30 words

The process of Claim 5 wherein the equivalent ratio of isocyanate groups of the NCO-prepolymer to free plus blocked amino groups of the polyamine is between about 4:1 and 1:1.5.

Claim 10

Dependent Claim 12 words

An aqueous polyurethane polyurea dispersion produced by the process of Claim 5.

Claim 11

Dependent Claim 20 words

The aqueous polyurethane polyurea dispersion of Claim 8 wherein the particle size is from about 20-200 mm. LeA 18,150-Ca -38-

Claim 12

Dependent Claim 243 words

A process for the production of an aqueous solution or dispersion of a polyurethane polyurea comprising mixing in the absence of water (a) a hydrophilic NCO-prepolymer having (i) an average isocyanate functionality of from about 1.8 to 2.2, (ii) an average molecular weight of from about 500 to 10,000, (iii) its hydrophilic properties contri-buted by dispersing centers selected from the group consisting of chemically incorporated cationic or anionic groups present in said NCO-prepolymer in from about 0.1 to 100 milliequivalents per 100 g of NCO-prepolymer, chemically incor-porated ethylene oxide units present in said NCO-prepolymer in from about 0.5 to 30% by weight, based on the weight of the NCO-prepolymer, and external emulsifiers present in about 1 to 30% by weight, based on the weight of the NCO-prepolymer, and (iv) a solvent content of up to about 25% by weight, based on the weight of the hydrophilic NCO-prepolymer, with LeA 18,150-Ca (b) a polyamine having (i) at least two amino groups selected from the group consisting of primary amino groups and secondary amino groups, (ii) at most one free primary or secondary amino group, (iii) at least one blocked amino group which is substantially inert towards isocyanate groups at room temperature in the absence of moisture and which releases a free primary or secondary amino group in the presence of water, and (iv) a molecular weight of from about 60 to 500, and subsequently mixing the mixture of components (a) and (b) with water.

Claim 13

Dependent Claim 243 words

A process for the production of an aqueous solution or dispersion of a polyurethane polyurea comprising mixing in the absence of water (a) a hydrophilic NCO-prepolymer having (i) an average isocyanate functionality of from about 1.8 to 2.2, (ii) an average molecular weight of from about 500 to 10,000, (iii) its hydrophilic properties contri-buted by dispersing centers selected from the group consisting of chemically incorporated cationic or anionic groups present in said NCO-prepolymer in from about 0.1 to 100 milliequivalents per 100 g of NCO-prepolymer, chemically incor-porated ethylene oxide units present in said NCO-prepolymer in from about 0.5 to 30% by weight, based on the weight of the NCO-prepolymer, and external emulsifiers present in about 1 to 30% by weight, based on the weight of the NCO-prepolymer, and (iv) a solvent content of up to about 25% by weight, based on the weight of the hydrophilic NCO-prepolymer, with LeA 18,150-Ca (b) a polyamine having (i) at least two amino groups selected from the group consisting of primary amino groups and secondary amino groups, (ii) at most one free primary or secondary amino group, (iii) at least one blocked amino group which is substantially inert towards isocyanate groups at room temperature in the absence of moisture and which releases a free primary or secondary amino group in the presence of water, and (iv) a molecular weight of from about 60 to 500, and subsequently mixing the mixture of components (a) and (b) with water.

Claim 14

Dependent Claim 27 words

An aqueous polyurethane polyurea dispersion having a solids content of from about 40 to 70% by weight produced by the process of Claim 10. LeA 18,150-Ca -40-

Process for the preparation of aqueous polyurethane dispersions and solutions

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