Room temperature curable silane-terminated polyurethane dispersions

An anionically stabilized polymer composition comprising polymer of formula (I)

• [SIL--X]--ISO--Y--[POL--X--ISO--Y].sub.n .about.[CE--X--ISO--Y].sub.m .about.[WSC--X--ISO--Y].sub.q --[SIL] (I)
• wherein [POL--X--ISO--Y], [CE--X--ISO--Y], and [WSC--X--ISO--Y] can be randomly distributed or form blocks;
• wherein
• SIL represents ##STR12## R.sup.3 is selected from the group consisting of hydrogen;
• alkyl radicals comprising about 1 to about 4 carbon atoms;
• acyl groups comprising about 2 to about 5 carbon atoms;
• and oxime groups of the formula --N.dbd.CR.sup.5 R.sup.6, wherein R.sup.5 is a monovalent alkyl group comprising about 1 to about 12 carbon atoms and wherein R.sup.6 is a monovalent alkyl group comprising about 1 to about 12 carbon atoms;
• R.sup.4 is a divalent radical comprising about 2 to about 20 carbon atoms, wherein said radical contains no isocyanate reactive functional groups;
• p represents an integer of 1 to 3;
• X is a divalent radical selected from the group consisting of ##STR13## wherein R is independently selected from the group consisting of phenyl, linear aliphatic groups comprising about 1 to about 12 carbon atoms, branched aliphatic groups comprising about 1 to about 12 carbon atoms, and cycloaliphatic groups;
• ISO represents a moiety derived from a polyisocyanate component comprising a compound having 2 isocyanate groups and optionally further comprising a compound having greater than 2 isocyanate groups;
• Y is a divalent radical selected from the group consisting of ##STR14## wherein R is as defined above;
• POL represents a moiety derived from a polyol component comprising a compound having 2 isocyanate reactive functional groups and optionally a compound having greater than 2 isocyanate reactive functional groups, each isocyanate reactive functional group having at least one active hydrogen;
• n represents an integer of about 2 to about 85;
• CE represents a moiety derived from a chain extender component comprising a difunctional chain extender having 2 isocyanate reactive functional groups and optionally a polyfunctional chain extender having at least 3 isocyanate reactive functional groups each isocyanate reactive functional group having at least one active hydrogen, wherein the chain extender component specifically excludes difunctional sterically hindered amines having the general formula ##STR15## wherein:
• R.sup.7, R.sup.8 R.sup.9 are independently selected from the group consisting of cyclic and aliphatic organic radicals free of isocyanate reactive functional groups, and with the proviso that at least 75% of the R.sup.9 groups have at least 4 carbon atoms;
• m represents an integer of about 1 to about 84;
• WSC represents a moiety derived from a water-solubilizing compound, wherein the water solubilizing compound possesses at least one water solubilizing group and at least two isocyanate reactive functional groups, each isocyanate reactive functional group containing at least one active hydrogen wherein the water solubilizing group is reacted with a basic salt forming compound to anionically stabilize the polymer;
• q represents an integer of about 2 to about 85;
• wherein the urethane branching coefficient of the polymer is about 1.7 to about 2.25;
• and wherein sufficient polyisocyanate component is included to provide an excess on an isocyanate equivalent basis of about 1.4 to about 4 times the combined active hydrogen equivalent of the isocyanate reactive functional groups of the polyol component, the water solubilizing compound, and the chain extender component.