反应详情

温度

190 fahrenheit

Corn starch (ethoxylated) is solubilized at 20% solids in water by heating at 190° F. for 30 minutes. Nine parts of the starch (solids basis based on clay) are mixed into 100 parts (solids basis) of the clay suspension obtained in part a). Then there are added 9 parts (solids basis) of a commercial latex dispersion of styrene/butadiene/acrylic acid copolymer (50% solids) in which the several monomers are present in the ratio 40/57/3. To this mixture, adjusted to pH = 9.0 with ammonia, is added one part (solids basis based on clay) of an aqueous polymer obtained by the solution polymerization of a mixture of 50 parts of methyl acrylate and 50 parts of oxazolidinylethyl methacrylate in about 900 parts of water in the presence of about 11 parts of t-octyl-phenoxy(poly)ethoxyethanol containing about 40 oxyethylene units by a gradual addition redox polymerization technique with an acetic acid co-feed to insure solubility throughout the reaction. The aqueous amino-polymer is adjusted to pH = 9 with ammonia before addition to the starch-clay-SB latex mixture. The resulting mixture is adjusted to 50% solids.

1. customobtained in part a)
2. additionis added one part (solids basis based on clay) of an aqueous polymer