4-Vinylphenol → 4-Ethynylphenol

The same crude p-vinylphenol as used in Example 1 was subjected to azeotropic distillation with toluene without being subjected to vacuum flash distillation, to reduce the water content to 0.038%. A polymerization reaction was conducted in the same manner as in Example 1 except that 28.8 g of acetonitrile was added to 32.3 g of the above-obtained fraction. The reaction mixture was purified by the same reprecipitation as in Example 1, and the resulting precipitate was dried to obtain 6.5 g of a yellowish brown poly(p-vinylphenol). The polymer had a weight-average molecular weight (Mw) of 20,400, a number-average molecular weight (Mn) of 11,500, a light transmittance at a wavelength of 248 nm, of 68.0%, a light transmittance at a wavelength of 450 nm, of 83.2%, and a glass transition temperature of 177° C.

1. distillationwas subjected to azeotropic distillation with toluene
2. distillationwithout being subjected to vacuum flash distillation
3. customA polymerization reaction
4. additionwas added to 32.3 g of the above-obtained fraction
5. customThe reaction mixture was purified by the same reprecipitation as in Example 1
6. customthe resulting precipitate was dried

ORD record

ord-9756f22c3ac3484eaae81b76f10c3555

Source dataset

uspto-grants-2001_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06258901B1