Patent GB-848359-A (GB)
Title: A process for the production of foamed polyurethane plastics
IPC: C08G18/10
Filed: 1958-02-27
Abstract: In the production of foamed polyurethanes by reacting a polyurethane intermediate containing free NCO groups with water, the intermediate has a viscosity of 1000 to 40,000 cps at 25 DEG  C and is derived from a polyhydroxy compound, e.g. a polyester, polyglycolether, polyhydric alcohol, polyesteramide, copolymers of styrene and ethylene oxide and polyacetals containing hydroxyl groups (as disclosed in Specification 798,209), a polyisocyanate and one or more additional components selected from water, diamines, oxyamines and substituted ureas containing reactive hydrogen atoms.  The polyhydroxy compound, polyisocyanate and additional component may be reacted simultaneously or the addition component added after the first two have reacted.  The proportions are chosen to give the desired viscosity and NCO content to the intermediate, upon which factors the properties of the resultant foam depend.  In examples intermediates are obtained from (1) an adipic acid-diethylene glycol polyester, tolylene diisocyanate and steam (reacted subsequently) giving a product of viscosity 21,000 cps and NCO content 10,5% by weight; (2) and (3) polypropylene glycol, tolylene di-isocyanate and water; (4) polypropylene glycol, tolylene diisocyanate and N-b -hydroxyethyl aniline; (5) polypropylene glycol, castor oil, tolylene diisocyanate and water; (6) polypropylene glycol, tolylene di-isocyanate and o-dichlorobenzidine ; (7) polypropyleneglycol, trimethylolpropane, tolylene di-isocyanate and steam.  Any carbon dioxide formed is removed under vacuum.  The intermediates are reacted in the usual way with water in the presence of tertiary amines (which may contain a hydroxy group) and emulsifiers to give foamed products.  Specifications 819,384 and 823,352 also are referred to.ALSO:In the production of polyurethane foams by reacting a polyurethane intermediate containing free NCO groups with water, the intermediate has a viscosity between 1000 and 40,000 c.p.s. at 25 DEG C. and is derived from a polydroxy compound, e.g. a polyester, polyglycolether, polhydric alcohol, polyesteramide, copolymer of styrene and ethylene oxide and polyacetals containing hydroxyl groups (as disclosed in Specification 798,209), a polyisocyanate and one or more additional components selected from water, diamines, oxyamines and substituted ureas containing reactive hydrogen atoms.  The proportions are chosen to give the desired viscosity and NCO content to the intermediate upon which factors the properties of the resultant foam depend.  In examples intermediates are obtained from (1) and adipic acid-diethylene glycol polyester, tolylene diisocyanate and steam (reacted subsequently) giving a product of viscosity 21,000 c.p.s. and NCO content 10,5% by weight; (2) and (3) polypropylene glycol, tolylene diisocyanate and water; (4) polypropylene glycol, tolylene diisocyanate and N-b -hydroxyethyl aniline; (5) polypropylene glycol, castor oil, tolylene diisocyanate and water; (6) polypropylene glycol, tolylene diisocyanate and o-dichloro-benzidine; (7) polypropylene glycol, trimethylolpropane, tolylene diisocyanate and steam.  Any carbon dioxide formed is removed under vacuum.  The intermediates are reacted in the usual way with water in the presence of tertiary amines (which may contain a hydroxy group) and emulsifiers to give foamed products. Specifications 819,384 and 823,352 also are referred to.