Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1994-03-31
1995-11-07
Sweet, Mark
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524173, 524233, 524588, 524425, C08K 53415
Patent
active
054648882
ABSTRACT:
A sealer or adhesive composition based on a polyoxyalkylene polymer having a silicon-containing hydrolyzable group, which has improved compatibility with a base or first paint coat containing acrylic resins. The improvement involves the addition to such a sealer/adhesive composition of a polar organic solvent material having both a Snyder's polarity value in the range of from 6.2 to 7.3 and belonging to Snyder's selectivity group III. In a method of the present invention, the inventive sealer/adhesive composition is wet-on-wet overcoated by a base coat of a multi-coat paint system, where the base coat contains acrylic resin, pigment and auxiliary polar solvents, while retarding and even completely preventing adverse surface defects in the base coat upon its drying (curing), such as cracking or wrinkling therein, to provide an improved coated substrate. Useful polar organic solvent materials that have been found to improve the compatibility of the seam sealer composition with a base coat in this manner have been found to include organic solvent materials such as N-methyl pyrrolidone, dimethyl sulfoxide, N,N-dimethylacetamide, and N,N-dimethylformamide.
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L. R. Snyder, J. Chromatographic Sci., pp. 223.gtoreq.234, Jun. 1978, Classification of the Solvent Properties of Common Liquids.
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"CRC Handbook of Solubility Parameters and Other Cohesion Parameters," edited by Allan F. M. Barton, 2nd ed., CRC Press, 1991, pp. 294-295.
Francis Richard
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Sweet Mark
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