Derivatized novolak polyhydroxystyrene from hydroxyphenylmethylcarbinol
View Patent ↗A process for preparing derivatized poly(4-hydroxystryrene) having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer. New compositions of matter which comprise the derivatized poly(4-hydroxystyrene) prepared in the above manner and which have application in the electronic chemicals market such as in a photoresist composition, and in other areas such as in varnishes, printing inks, epoxy resins, copying paper, tackifiers for rubber, crude oil separators, and the like.
1. A process for preparing derivatized polyhydroxystyrene having a novolak type structure which comprises the steps of (a) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (b) contacting said solution with an acid ion exchange resin for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (c) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer.
2. The process as set forth in claim 1 wherein said acid catalyst is a Lewis acid.
3. The process as set forth in claim 1 wherein the temperature in steps (b) and (c) is from about 0° C. to about 100° C. and the pressure is from about 0 psig to about 10 psig.
4. The process as set forth in claim 1 wherein the acid catalyst is a mineral acid.
5. The process as set forth in claim 4 wherein the acid catalyst is sulfuric acid.
6. The process as set forth in claim 1 wherein the acid catalyst is selected from the group consisting of H 2 SO 4 , HCL AlCl 3 , H 3 PO 4 , oxalic acid, SnCl 2 , BF 3 , BBr 3 , BCl 3 , para-toluene sulfonic acid, methane sulfonic acid, trifluoroacetic acid, trichloroacetic acid and mixtures thereof.