Chemically treated glass fibers and strands and dispersed products thereof

Glass fibers treated with an aqueous chemical treating composition, comprising:

• A. isocyanate-containing prepolymer formed from:
• 1. organic polyisocyanate,
• 2. active hydrogen-containing material having at least two active hydrogens per molecule,
• 3. hydrophilic additives selected from the group consisting of polyethers having a predominant amount of ethylene oxide moieties, polyoxyethylene polyol homopolymers, monofunctional polyethers, polyether polyols, diisocyanates having lateral hydrophilic ethylene oxide units, organic compounds which are difunctional in the isocyanate polyaddition reaction and contain lateral hydrophilic ethylene oxide units, monoisocyanates which contain terminal, hydrophilic ethylene oxide units, compounds which are monofunctional in the isocyanate polyaddition reaction and contain terminal hydrophilic ethylene oxide units, organic compounds having at least two active hydrogens per molecule having ionic or precursor ionic groups and mixtures thereof, and
• 4. at least one organosilane having at least one isocyanate-reactable group on one or more organic moieties of the organosilane and having at least one hydrolyzed or hydrolyzable group associated with the silicon atom, wherein any ionic or precursor ionic hydrophilic additive is added after the organosilane and polyisocyanate have reacted to a substantial degree,
• B. neutralizing agent in an effective amount to neutralize a substantial amount of precusor ionic groups of the hydrophilic agent into ionic groups,
• C. water in a sufficient amount to form an oil-in-water dispersion of the isocyanate-containing prepolymer,
• D. chain-extender in an amount to react with a substantial number of the isocyanate groups on the isocyanate-containing prepolymer,
• E. wherein the pH of the dispersion is at least around 7, when the silyl concentration on the polymer is greater than around 0.1 weight percent of the water in the dispersion isocyanate-containing prepolymer as a substantial portion of the silyl groups in the prepolymer or the chain-extended polymer are present as siliconate anions, and wherein said organic polyisocyanate and said organic compound with at least two reactive hydrogens per molecule are predominantly difunctional in the isocyanate-polyaddition reaction, and wherein the organosilane is present as a comonomer in forming the prepolymer or as a chain extender
• F. one or more lubricants in an effective lubricating amount, and
• G. water in an amount to give a total solids for the aqueous chemical treating composition so that the composition can be applied to glass fibers.