The monomer reactivity ratios for the systems, methallyl alcohol (MAA) -styrene (ST) and MAA-methylmethacrylate (MMA), have been measured at 60°, 70° and 80°C, obtaining the following results.
ST (M
1)-MAA (M
2) MMA (M
1) -MMA (M
2)
Temp. 60° 70° 80° 60° 70° 80°
r
1 5.24 4.70 4.13 3.64 3.35 3.35
r
2 0.004 0.011 0.016 0.030 0.041 0.052
As the MAA content in the monomer mixture was increased, the rate of copolymerization reaction as well as the viscosity of benzene solution of the copolymer were decreased.
Two acrylic resins were prepared from styrene 20 moles, n-butyl acrylate 10 moles, acrylic acid 1 mole, and either β-hydroxylethyl methacrylate or MAA 5 moles, which were blended with a butylated melamine-formaldehyde resin at the solids weight ratio 70/30 and two white enamels were prepared. The enamels were applied on steel panels and baked at 150° for 20° minutes, and their film properties were compared. The films obtained from the acrylics containing MAA were superior in gloss, light fastness, hardness and turpentine-oil resistance to those obtained from 8-hydroxylethyl methacrylate, while the other properties were move or less the same.
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