Novolak type phenolic resins and methods of manufacturing thereof
AssigneeGun Ei Chemical Industry Co., Ltd.
InventorsYoshiaki Kurimoto, Akiyuki Kojima, Yukio Abe, Tsuyoshi Fukuda, Kaori Hasegawa
Life of this patent
Estimating the term…
Abstract
One of the objects of the present invention is to offer novolak type phenolic resins which use phenols and aldehydes as raw materials and give narrow molecular weight distributions. The novolak type phenolic resins of the present invention are those obtained by condensation reaction of phenols with aldehydes in the presence of an oxycarboxylic acid having carboxyl groups, --COOH, and alcoholic hydroxyl groups, --OH, in one molecule. Thus obtained novolak type phenolic resins show narrow molecular weight distributions, lower viscosity in molten state and, as a consequence, uniformity in curing time.
Claims16
A method of manufacturing a novolak type phenolic resin, which comprises reacting an oxycarboxylic acid selected from the group consisting of tartaric acid, citric acid and a mixture thereof, with an aldehyde, and reacting the resultant reaction product with a phenol.
A method of manufacturing a novolak type phenolic resin, which comprises reacting an oxycarboxylic acid selected from the group consisting of tartaric acid, citric acid and a mixture thereof, with an aldehyde, reacting the resultant reaction product with a phenol, and after completion of the reaction, washing the resultant reaction mixture with water to remove catalyst and dehydrating and concentrating the resultant mixture.
Dependencies are inferred from the claim text.