Water-based coatings with improved sagging and popping character

Details Water-based coatings with improved sagging and popping character Water-based coatings with improved sagging and popping character

1975-10-01

1977-12-27

Welsh, M. J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 293, 260 294UA, 260 296NR, 260 296TA, 260 296E, C08L 3302

Patent

active

040654150

ABSTRACT:
This invention relates to a water-based coating composition in which solvent or water popping and sagging are eliminated or substantially reduced. The composition comprises a thermosetting, film-forming organic binder dispersed in an aqueous medium containing from 60 to 100 parts by weight of water and 0 to 40 parts by weight of a volatile organic solvent. The organic binder is formulated from (a) and acid-containing interpolymer adapted to be dissolved or dispersed in water with the acid of a base; (b) a water-soluble or water-dispersible polyether polyol or polyester polyol having a molecular weight of at least 300 and (c) a water-soluble or water-dispersible aldehyde condensation resin. The interpolymer consists essentially of a carboxylic acid amide in units of the structure: ##STR1## wherein R' is hydrogen or lower alkyl and R is lower alkyl; an alpha, beta-ethylenically unsaturated carboxylic acid; and at least one other monomer containing a CH.sub.2 =CH< group.
In addition to the elimination of, or substantial reduction in solvent or water popping and sagging of the composition, films formed from the compositions exhibit excellent properties, such as hardness, water resistance, salt spray resistance and stain resistance.

REFERENCES:
patent: 3081278 (1963-03-01), Wohnsiedler
patent: 3085085 (1963-04-01), Wismer et al.
patent: 3288740 (1966-11-01), Maeder et al.
patent: 3403088 (1968-09-01), Hart
patent: 3652478 (1972-03-01), Ishii et al.
patent: 3772227 (1973-11-01), Kapalko et al.
patent: 3860549 (1975-01-01), Sekmakas
patent: 3926888 (1975-12-01), Cheung et al.
patent: 3937679 (1976-02-01), Bosso et al.
patent: 3959202 (1976-05-01), Blank

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