Crosslinkable waterborne dispersions of hydroxy functional polydiene polymers and amino resins
AssigneeShell Oil Company
InventorsDavid John St. Clair, James Robert Erickson
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Abstract
A crosslinkable waterborne dispersion of a hydroxy functional polydiene polymer composition which comprises: (a) 10 to 65% w of a hydroxy functional polydiene polymer, (b) 0.2 to 25% w of a compatible amino resin, (c) 0.1 to 10% w of a surfactant which is nonionic or anionic and has a volatile cation, and (d) the balance water. The invention also describes a water-continuous process and an inversion processes for making such dispersions.
Claims11
A process for making a stable water dispersion of a crosslinked hydroxy functional polydiene polymer composition which comprises:
- a) making a mixture of a surfactant which is nonionic or anionic having a volatile cation and water,
- b) adding a mixture of a hydroxy functional polydiene polymer and a compatible amino resin to the surfactant/water mixture,
- c) dispersing the polymer/resin mixture in the surfactant/water mixture by mixing with a high shear mixer/emulsifier in the absence of an organic solvent, and
- d) crosslinking the hydroxy functional polydiene polymer and the amino resin by adding a proton-donating acid catalyst and heating to a temperature of 100.degree. to 300.degree. C.
A process for making a stable water dispersion of a crosslinked hydroxy functional polydiene polymer composition which comprises:
- a) mixing together at a temperature of 25.degree. to 90.degree. C. a hydroxy functional polydiene polymer, a compatible amino resin, and a surfactant which is an amine salt of an organic acid,
- b) adding water to the mixture over a period of at least 15 minutes while maintaining the mixture under vigorous agitation in the absence of an organic solvent, and
- c) crosslinking the hydroxy functional polydiene polymer and the amino resin by adding a proton-donating acid catalyst and heating to a temperature of 100.degree. to 300.degree. C.
Dependencies are inferred from the claim text.