| abstract |
Novel hydroxypropyl methylcellulose ethers have a methoxyl degree of substitution of from 0.2 to 1.0 and a hydroxypropyl molar substitution of at least about 1.5 with a total combined degree of substitution of at least about 1.8. These ethers have desirable solubility properties in anhydrous organic solvents such as methanol and ethanol and can be employed as thickeners and film formers. They are prepared by concurrent reaction of controlled proportions of methyl chloride and propylene oxide with alkali cellulose. |