Patent GB-1006630-A (GB)
Title: An improved process for preparing foamed polymeric materials
IPC: C08G18/22
Filed: 1963-02-21
Abstract: Cellular polyurethanes are prepared by reacting an organic compound having 2 or more reactive hydrogen groups with an organic polyfunctional isocyanate and water, in the presence of a gelation catalyst of formula Sn(OCOR)2 or R1aSnXb where R and R1 are hydrocarbon residues, the sum of a and b is 4 and X chlorine, carboxylate, mercaptide, alkoxy, or mercaptoacid ester, and a blowing catalyst constituted by a carboxylic acid salt of Mn, Fe, Ni or Co. Specified acids from which the salts may be derived are: benzoic, naphthoic, phenylacetic, cinnamic, toluic, methyl toluic, naphthenic, acetic, propionic, butyric, caproic, caprylic, cupric, stearic, oleic, linoleic and tall oil fatty acids.  The reaction may be in a single stage in which all the reactants are mixed at room or elevated temperature. Alternatively the catalyst and water may be added to the reaction product after the other reactants.  A trimethyl end-blocked dimethyl polysiloxane may also be present. The reactive hydrogen containing compound may have a molecular weight of 500 or more. Specified compounds are polyesters optionally polyisocyanate modified, polyethylene glycol, polypropylene glycol, polyisocyanate modified polyesteramides, polymercaptans, polyamines, polyisocyanate modified polyalkylene glycols and glycerides derived from castor oil, hydrogenated castor oil or blown natural oils.  Polyesters may be obtained from dibasic carboxylic acids, e.g. adipic, fumaric, sebacic or phthalic and diols or trols, e.g. ethylene glycol, diethylene glycol or trimethylol propane.  The polyisocyanate may represent 5-300% of the weight of the polyalkylene polyol.  Specified compounds are hexamethylene diisocyanate, decamethylene diisocyanate, phenylene diisocyanate, tolylene-2,4 and 2,6-diisocyanates, naphthalene diisocyanate, 4,41-diphenylmethane diisocyanate and triisocyanates derived from arylene diisocyanates and trimethylol propane or hexane triol.  The percentage of water may be 0.5-10.  There may be 0.005-4.95% soap and 0.01-5 times as much gelation catalyst. Group R and R1 specified are methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tertbutyl, amyl, hexyl, 2-ethylhexyl, heptyl, octyl, nonyl, decyl, undercyl, oleyl, o., m- and p-tolyl, naphthyl, cyclohexyl or benzyl and X= chloride, laurate, 2-ethylhexoate, mercaptide, laurylmercaptide or isooctylthioglycolate. They may be used with or without N-ethylmorpholine. The soap may be prepared from the corresponding acid and a base, e.g. Co(OH)2, or a salt, e.g. FeCl2. The product may be used for cushions of insulation. In the examples a glycerine centred polypropylene oxide was reacted with a tolylene-2,4 and 2,6-diisocyanate mixture in the presence of trimethyl end-blocked dimethyl polysiloxane, demineralized water, a gelation catalyst and a soap.  In Examples (1)-(7) the gelation catalyst was stannous 2-ethyl-hexoate and the soap was (1) ferrous distearate, (2) manganous linoleate, (3) nickel stearate, (4) cobalt stearate, (5) manganese stearate, (6) ferrous linoleate, (7) cobalt naphthenate, and (8) a ferrous stearate ferric stearate mixture.  In other examples the polyalkylene polyol was replaced by a polyester of adipic acid. Specification 1,006,840 is referred to.