Reaction equation
[OH2:1].[C:2](O)(=O)C.[CH3:6][Si]([O:12][CH3:13])(OC)OC.[CH2:14]([O:18][CH2:19][CH2:20][CH2:21][Si](C)(OC)OC)[CH:15]1O[CH2:16]1>CO>[C:19]([O:12][CH3:13])(=[O:18])[C:20]([CH3:21])=[CH2:2].[C:14]([O:18][CH2:19][CH2:20][CH2:21][CH3:6])(=[O:1])[CH:15]=[CH2:16]Participants
Procedure
A 2-liter flask was charged with 700 g of deionized water and 20 g of 1N acetic acid. While the flask was cooled with water so as to maintain the internal temperature below 30° C., with stirring, 544 g (4.0 mol) of methyltrimethoxysilane and 110 g (0.5 mol) of 3-glycidoxypropylmethyldimethoxysilane were added dropwise over 1-1/2 hours for hydrolysis. The reaction solution was ripened for 5 hours at 30° C. Methanol formed and water were distilled off at 60° C. and 30 mmHg in a total amount of 392 g. The reaction solution, which was cloudy at this point, was left to stand whereupon the silicone resin settled to the flask bottom. To this, 213 g of methyl methacrylate (MMA) and 142 g of butyl acrylate (BA) were added for dissolving the silicone resin again, obtaining 720 g of a MMA/BA solution of silicone resin. The solution was allowed to stand whereupon the aqueous layer separated off. To the organic layer, 72 g of 2-butoxyethyl acetate was added, obtaining a MMA/BA solution (A-7) (solids concentration 43.1%) of silicone resin (S-7). This silicone resin (S-7) is represented by the average compositional formula:
Workup
- temperatureto maintain the internal temperature below 30° C.
- distillationwater were distilled off at 60° C.
- waitwas left
- additionTo this, 213 g of methyl methacrylate (MMA) and 142 g of butyl acrylate (BA) were added
- dissolutionfor dissolving the silicone resin again
Sources & evidence
- ORD record
- ord-0f146b5cc1cb49d297428c9f3f81d4c3
- Source dataset
- uspto-grants-2000_04
- Patent number
- US06048910
Linked notes
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