Methyl Methacrylate → HCID 19860278, compound

Participants

Reaction Conditions

Reaction Steps

A liquid rubber suitable for preparing single phase uncured LR/thermoset liquid resin compositions in accordance with the present invention was prepared by batch free radical polymerization in a CFSTR as follows. A monomer mixture was prepared from n-butyl acrylate (“BA”), methyl methacrylate (“MMA”), and glycidyl methacrylate (“GMA”) in a weight ratio of 90:5:5. Di-tertiary butyl peroxide (“DTBP”, 4 weight percent based on the total weight of the monomer) was added and this mixture was fed into a glass vessel. The mixture was purged with an inert gas such as nitrogen, then degassed and stored under a nitrogen blanket. The solvent/chain transfer agent (toluene, 20 weight percent based on the total weight of monomer charged) was charged to the reactor, which was set at an external pressure, via the grove valve, of 125 psi. The reactor (solvent) was then heated to a constant temperature of 200° C. Within a few seconds of the temperature becoming stable, the monomer mixture was introduced into the reactor through a high capacity pump within a six minutes (flow rate=30 grams/minute) and the entire mixture was agitated at 300 rpm. The mixture was then pumped through a series of filters into a 600 mL-BSTR in which the monomers were copolymerized over about 40 to 60 minutes, resulting in a 92-95 weight percent monomer conversion. The residual monomer and solvent was removed by vacuum devolatilization to yield the finished product, p(BA/MMA/GMA) having a weight ratio of 90/5/5. The devolatilization can also be carried out by passage through a static mixer (18 inches long, 1 inch diameter), under low pressure.

Provenance & Evidence