Water-based primers with a low volatile organic content

Details Water-based primers with a low volatile organic content Water-based primers with a low volatile organic content

1996-02-07

1998-10-06

Mosley, Terressa

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

273235, 524460, 525440, 528 85, C08G 1834

Patent

active

058177353

ABSTRACT:
The present invention pertains to a primer composition having a volatile organic content (V.O.C.) less than about 1.5. A pigmented or clear topcoat may be applied over this primer composition. The primer composition includes a substantially solvent-free urethane dispersion and a substantially solvent-free acrylic. The solvent-free urethane component and the solvent-free acrylic component could contain as much as 15 weight percent of a solvent as long as the combined solvent content of these two components is such that the V.O.C. of the resulting primer is less than about 1.5. The amount of the solvent-free urethane component present in the low V.O.C. primer prepared in accordance with the present invention ranges from between about 10 to about 90 weight percent, while the amount of the solvent-free acrylic component ranges from between about 90 to about 10 weight percent. The solvent-free urethane component has a tensile strength which ranges from between about 4,000 to about 9,000 psi. and a glass transition temperature (T.sub.g) ranging from between about 20.degree. C. to about 50.degree. C. The solvent-free acrylic component, which has a T.sub.g in the range from between about 10.degree. C. to about 90.degree. C., can be either or made in water or in a solvent and thereafter dispersed in water.

REFERENCES:
Cydrothane.RTM. Polyurethane Dispersions, CYTEC Urethane Chemicals Department, West Patterson, NJ 07424, pp. 2-21.
New and Improved Waterborne Polyurethanes From The TMXDI.RTM. (META) Aliphatic Isocyanate Family, Robert D. Cody and Victoria S. Askew, Urethane Chemicals & Elestomers Dept., American Cyanamid Company, Bridgewater NJ 08807.

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