Meister, Alkyd polymers were invented in 1930, acrylic polymers - in 1935, vinyl - in 1937, these polymers were used initially in the form of solutions in organic solvents, and since 1949 in the form of water dispersions
http://forum.artinvestment.ru/showthread.php?t=8175
I am very interested in how the experts have determined that the work of 30-ies, was the work of the 50's. (I understand the basis they took pigments? Which was not in 30-s?)