Methyl Methacrylate → Methyl Methacrylate

Participants

Reaction Conditions

Reaction Steps

To a mixture of 65.0 parts of the latex product of Example 1 and 178 parts of water at 140° F., there is added, separately and portionwise over a period of one hour, (1) a mixture of 17.5 parts of methyl methacrylate, 2.0 parts of acrylonitrile and 15.5 parts of styrene; (2) 0.275 part of 80% aqueous cumene hydroperoxide; and (3) a solution of 0.015 part of ferrous sulfate heptahydrate, 0.045 part of 48% aqueous trisodium ethylene diamine tetraacetic acid, and 0.15 part of sodium formaldehyde sulfoxylate in 1.50 parts of water. After 10 minutes of this one-hour period at 140° F., the temperature is raised to 160° F. and held there for the remaining 50 minutes and for an additional two hours. At the end of this period a solution of 2.0 parts of 15% aqueous potassium oleate and 0.45 part of sodium hydroxide in 30 parts of water is added. The polymerization mixture is agitated mildly throughout and then filtered through cheesecloth to yield 306 parts of latex (a graft copolymer of methyl methacrylate, acrylonitrile and styrene on a substrate copolymer of styrene and butadiene). Its pH is 10.3; total solids: 33.6%.

Provenance & Evidence