Accession Number : ADD001078
Title : Linear Polyurethanes Formed by Reacting Dimethylol Phenol with a Diisocyanate.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C
Personal Author(s) : Einberg,Fred J
Report Date : 01 Nov 1966
Pagination or Media Count : 3
Abstract : This invention relates to polyurethanes and particularly to the preparation thereof from polymethylol phenols and phenol ethers and polyisocyanates. It also relates to improved polyurethane coating solutions and varnishes and to articles coated therewith. Linear polyurethanes may be prepared by mixing equimolar quantities of the polyol compound and the polyisocyanate in a suitable solvent, in the presence of a catalyst, e.g., a tertiary amine or an acetylacetonate salt of a heavy metal. Precipitation of the resultant resins may be effected in water or methyl alcohol, after which the resins may be filtered and dried. Various reactants and conditions used in the preparation of the inventive linear polyurethanes as well as physical data of the by-products are given.
Descriptors : *Patents, *Polyurethane resins, *Polymerization, Carbinols, Phenols, Isocyanates, Synthesis(Chemistry)
Subject Categories : Organic Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE