| 摘要 |
1415983 Coating compositions; modified acrylic polymers DOW CHEMICAL CO 24 Jan 1973 3692/73 Headings C3B and C3P Water-thinnable coating compositions comprise (1) a water-miscible solvent, (2) a watersoluble polymer prepared by neutralizing with an acid the pendant amino groups in an aminoethylated polymer containing units of the formula wherein R 1 and R 2 are each H or C 1-4 alkyl and the average value of n ranges from 1À0 to 2À5, the polymer before aminoethylation containing at least 3 wt. per cent of pendant carboxyl groups, and (3) an epoxy resin. Numerous solvents, polymers and epoxy resins are specified. The compositions may be formed as two-component packs, one component containing polymer and solvent and the other containing epoxy resin. In examples, copolymers of methyl methacrylate, butyl acrylate, methacrylic acid (which may be replaced by acrylic acid) and styrene are aminoethylated by reaction of pendant carboxyl groups with ethylene imine or N-(2-aminoethyl)aziridine, and the products are then neutralized with formic acid or acetic acid. The water-soluble products are then formed into paints by admixture with one or more of the following ingredients: titanium dioxide, silica, chrome oxide green, an aromatic solvent (antifoaming agent), water, n-propanol, iso-propanol, propylene glycol, ethylene or propylene glycol mono-ethyl ether, dipropylene glycol monomethyl ether, the mono-isobutyl ether of mixed mono-/di-propylene glycols, and, as epoxy resin, the diglydicyl ether of Bisphenol A. The latter forms part 2 of the composition, either alone or with one or more solvents, the remaining components forming part 1, and the two parts being mixed immediately prior to use. |
