Waterborne Latex Coating Composition
A technology of water-based latex and composition, applied in latex paint, coating and other directions, can solve the problem of high anti-caking performance and other problems
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[0041] Preparation of emulsion copolymer
[0042] The VAE and acrylic copolymers comprising the essential and optional comonomers described above can be prepared using conventional emulsion polymerization methods leading to the preparation of copolymer emulsions. These emulsions can then be added to the coating compositions herein in aqueous latex form. Such methods are described, for example, in US Patent No. 5,849,389, the disclosure of which is incorporated herein by reference in its entirety.
[0043] In a typical polymerization process, vinyl esters, ethylene, acrylates and other comonomers may be prepared in an aqueous medium in a suitable polymerization vessel at a pressure not exceeding 100 atmospheres in the presence of catalyst components and at least one emulsifier down aggregation. The aqueous reaction mixture in the polymerization vessel can be maintained at a pH of about 2-6 with suitable buffers.
[0044] The manner in which the several polymerization ingre...
Embodiment 1
[0090] Preparation of Acrylic Emulsion A1
[0091] (Itaconic acid comonomer - a pre-emulsion)
[0092] Two separate feeds, designated as Feed 1 and Feed 2, were prepared having the composition in grams as set forth in Table 1.
[0093] Table 1
[0094]
Feed 1 Feed 2 water 56 370 C 12 / 14 - Alkyl ethoxylate sulfate (30%, Na-salt, average 4EO) - 63.9 C 12 / 14- Alkyl Ethoxylates (65%, Average 30EO) - 4.48 Methyl methacrylate - 450 Butyl acrylate - 616 itaconic acid - 17.9 Diacetone Acrylamide (DAAM) - 36.0 Ammonia (25%) - 7.53 Ammonium persulfate 6.20 -
[0095] A 3-LT reactor equipped with a condenser, mechanical stirrer and thermometer was charged with 661 g of water, 13.6 g of 12 / 14 - Alkyl ethoxylate sulfate (30%, Na-salt, average 4EO) and 0.57gC 12 / 14 - Alkyl ethoxylates (65%, average 30EO). The reactor contents were heated to 70° C. with stirring and a mixture of 50.4 g methyl methacryl...
Embodiment 2
[0100] Preparation of Acrylic Emulsion A2
[0101] (Itaconic acid comonomer - two pre-emulsions)
[0102] Three separate feeds, designated as Feed 1 , Feed 2, and Feed 3, were prepared with compositions in grams as set forth in Table 2.
[0103] Table 2
[0104]
Feed 1 Feed 2 Feed 3 water 56 259 111 C 12 / 14 - Alkyl polyglycol ether sulfate (30%, sodium salt, average 4EO) - 44.7 19.2 C 12 / 14 - Alkyl ethoxylates (65%, average 30EO) - 3.14 1.34 Methyl methacrylate - 126 414 Butyl acrylate - 368 158 itaconic acid - 12.5 5.38 Diacetone Acrylamide (DAAM) - 25.2 10.8 Ammonia (25%) - 5.27 2.26 Ammonium persulfate 6.20 - -
[0105] A 3-LT reactor equipped with a condenser, mechanical stirrer and thermometer was charged with 661 g of water, 13.6 g of 12 / 14 - Alkyl polyglycol ether sulfate (30%, sodium salt, average 4EO) and 0.57gC 12 / 14 - Alkyl ethoxylates (65%, average 30EO). The reactor...
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