After adding 12.6 g of potassium carbonate , 2.52 g of potassium iodide and 13.15 g of tert-butylchloroacetate, the solution obtained was refluxed for 10 hours.
Same post-treatment as that of Reference Example 5 was carried out to obtain poly (p-vinylphenol) wherein 1% of the hydroxyl groups were ethyletherified and 21% of the hydroxyl groups were tert-butoxycarbonylmethyletherified.