| abstract |
The oligomeric products of the condensation of certain dialdehydes and certain phenols may have their ends capped by one half of vinylbenzyl and by other particular halves, in particular alkyl groups, so as to produce thermosetting resins which are particularly useful for the manufacture of wafers. laminated circuits. The resins obtained by the reaction of glyoxal in a molar proportion equal to 1 with phenol in a molar proportion of between 3 and 4, then capped at their end with 50 to 85% of vinylbenzyl groups, the remaining substances being alkyls with 1 to 11 carbon atoms, are particularly useful. |