Trimethyl borate → Boric Acid

Temperature

60 °C

207.6 Grams (2.0 mols) of trimethyl borate was added to 522 g (3.0 mols) of diethylene glycol monomethacrylate. The mixture was heated to 60° C. with stirring in a dry air atmosphere. The mixture was kept at 60° C. for 1 hour, followed by heating to 75° C. After the temperature reached 75° C., the pressure in the system was gradually reduced. The system was kept at a pressure of 2.67 kPa (20 mmHg) or lower for 6 hours to remove volatile matters produced with progress of ester interchange reaction of boric acid and excess trimethyl borate, followed by filtration to obtain 515 g of a polymerizable boron-containing compound H (an esterification product of boric acid with diethylene glycol monomethacrylate) represented by the formula (2). An infrared absorption spectrum of the resulting polymerizable boron-containing compound H was measured to confirm that the absorption band originating from hydroxyl group at 3300 cm−1 disappeared.

1. temperatureby heating to 75° C
2. customreached 75° C.
3. waitThe system was kept at a pressure of 2.67 kPa (20 mmHg) or lower for 6 hours
4. customto remove volatile matters

ORD record

ord-419e4f71239c4bd7938b7db6d2479101

Source dataset

uspto-grants-2009_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07473492B2