Solution polymerization in isopropanol and water
A technology of isopropanol and solution, which is applied in the field of polymerizing vinyl and acrylic acid monomers and solution polymerization, and can solve problems such as undisclosed polymerization methods
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example 1
[0019] Synthesis of AA / IA / VAc terpolymers (30 / 30 / 40 composition) using tert-butyl peroxypivalate as initiator in a mixed solvent, IPA / water: 75 / 25
[0020]A two liter round bottom flask was equipped with a mechanical stirrer, heating mantle, thermocouple, condenser and inlets for addition of monomer and initiator. An initial mixture of 62 g (24.8%) water and 188 g (75.2%) isopropanol (IPA) was charged to the kettle. The kettle contents were stirred and 65 g (30%) of itaconic acid monomer (IA) was charged to the kettle along with 5 g (2%) of heel charge of t-butyl peroxypivalate initiator . The kettle contents were heated to 80°C. A monomer charge was prepared by mixing vinyl acetate (VAc) (86 g, 40%) and acrylic acid (AA) (65 g, 30%) monomers together and fed to the reactor over 2 hours. An initiator charge consisting of 10 g (4.63%) tert-butyl peroxypivalate dissolved in 35 g IPA was fed over a 2.5 hour period. The reaction was carried out at reflux and maintained at 80°C...
example 2
[0021] Example 2 (RP 1034):
[0022] Synthesis of acrylic acid / itaconic acid / vinyl acetate terpolymer (30 / 30 / 40 composition) in mixed solvent, IPA / water: 75 / 25, using sodium persulfate as initiator
[0023] A two liter round bottom flask was equipped with a mechanical stirrer, heating mantle, thermocouple, condenser and inlets for addition of monomer and initiator. An initial mixture of 52.7 g water and 187.5 g IPA was charged to the kettle along with 65 g itaconic acid monomer. The kettle contents were heated to 80°C and additional sodium persulfate prepared by dissolving 5 g of salt in 10 g of water was added to the kettle. The synthesis procedure described above in Example 1 was repeated with an initiator feed consisting of 10 g (4.63%) sodium persulfate dissolved in 35 g water followed by a Dean Stark solvent exchange over a 2.5 hour period, As described in Example 1 above. Final product solids 32%, molecular weight Mw 18620, Mn 2541, Mw / Mn 7.32. Residual monomer conte...
example 3
[0029] Synthesis of AA / maleic acid / VAc terpolymer (30 / 30 / 40 composition) in a mixed solvent, IPA / water: 75 / 25, using tert-butyl peroxypivalate as an initiator
[0030] A two liter round bottom flask was equipped with a mechanical stirrer, heating mantle, thermocouple, condenser and inlets for addition of monomer and initiator. An initial mixture of 63.9 g (25.4%) water and 188 g (74.6%) IPA was charged to the kettle. The kettle contents were stirred and 65 g (30%) maleic anhydride was charged to the kettle. The kettle contents were heated to 80°C. An initiator charge was prepared using 15 g (6.9%) tert-butyl peroxypivalate in 35 g IPA. The initiator was fed into the kettle for 2 minutes at temperature, after which the monomer feed was started. Similar to Example 1, a monomer charge was prepared by mixing vinyl acetate (86 g, 40%) and acrylic acid (65 g, 30%) monomers together and fed to the reactor over 2 hours. Initiator was fed for a total time of 152 minutes. The react...
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