Premium
Novel oxidatively drying urea resin. I. Drying properties of urea resins prepared from N,N ′‐bis(methoxymethyl) urea and alcohols containing allyl ether groups
Author(s) -
Toivonen Hannu
Publication year - 1981
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1981.070261205
Subject(s) - urea , chemistry , polymer chemistry , ether , molar mass distribution , monomer , sodium hydroxide , zinc , nuclear chemistry , organic chemistry , polymer
A new type of urea resin prepared by copolycondensating N,N ′‐bis(methoxymethyl) urea with an alcohol containing allyl ether groups have been studied and found to have adequate drying properties when used for surface coating purposes. The drying behavior of the resins can be controlled by conventional drier metals, cobalt being an efficient catalyst. Calcium was found to have a synergetic effect with cobalt on drying, zinc and lead had no synergetic effect, and manganese and sodium hydroxide acted as drying inhibitors. Increasing the amount of allylic alcohol in the monomer mixture and higher molecular weight led to the formation of a faster drying resin. The molecular weight distribution of the resins was found to have an effect on the surface coating properties. It was found that for resins having an equal drying rate those with a broader molecular weight distribution had higher solution viscosities. Resins with a narrow molecular weight distribution were also found to be advantageous when formulating coating compositions containing a minimum concentration of solvents.