Patent GB-893179-A (GB)
Title: Polyurethane plastics
IPC: C08G18/42
Filed: 1960-04-07
Abstract: Polyurethane elastomers are made by reacting an organic polyisocyanate and a cross-linking agent which contains in the molecule at least two active hydrogen containing groups which are reactive with isocyanate groups, with a hydroxyl polyester under such conditions that a substantially non-cellular product results, the polyester containing at least two free hydroxyl groups per molecule, having an acid number up to 3, an hydroxyl number between 30 and 120, a molecular weight of at least 750 and being made by reacting ethylene glycol and 1,4-butylene glycol with adipic acid, the molar ratio of ethylene glycol to butylene glycol being from 1:6 to 2:1. Many organic polyisocyanates are specified, examples being 3,31-diisocyanate dipropyl ether, cyclohexylene-1,4-diisocyanate, diphenyl-4,6,41-triisocyanate, p-phenylene diisocyanate and ethylene diisocyanate.  Specified cross-linking agents are water, ethylene glycol, propylene glycol, butylene glycol, amylene glycol, trimethylol propane, diethylene glycol, triethylene glycol, pentaglycol, glycerol, sorbitol, triethanolamine di-(b -hydroxyethyl)ether, ethanolamine, 3-aminopropanol, 5-aminopentanol-1, 6-aminohexanol, 6-amino-5-methyl-hexanol-1, 10-aminodecanol, p-hydroxymethylbenzylamine, ethylene diamine, hexamethylene diamine, 3-methylhexamethylene diamine, decamethylene diamine, m-phenylene diamine and hydrazine.  In the examples, polyesters derived from butane-1,4-diol, ethylene glycol and adipic acid are reacted with:-(1) to (3) a mixture of 2:4- and 2:6-toluylene diisocyanate in the presence of water, the product being mixed with dimeric 2:4 toluylene diisocyanate and vulcanized by heating; (4) 1,5-naphthylene diisocyanate and butane-1,4-diol in a mould; (5) 1,5-naphthylene diisocyanate and water, the foamed product being compressed into a sheet and aired and (6) and (7) 1,5-naphthylene diisocyanate and butane -1,4-diol in a mould.  Specification 700,608 is referred to.ALSO:Polyurethane elastomers are made by reacting on organic poldisocyanate and a cross-linking agent which contains in the moleucle at least two active hydrogen containing groups which are reactive with isocyanate groups, with a hydroxy polyester under such conditions that a substantially non-cellular product results, the polyester containing at least two free hydroxyl groups per molecule, having an acid number up to 3, an hydroxyl number between 30 and 120, a molecular weight of at least 750 and being made by reacting ethylene and 1,4 butylene glycol with adipic acid, the molar ratio of ethylene glycol to butylene glycol being from 1 : 6 to 2 : 1.  Many organic polyisocyanates are specified, examples being 3,31-diisocyanate dipropyl ether, cyclohexylene-1,4-diisocyanate, diphenyl-4,6,41-triisocyanate, p-phenylene diisocyanate and ethylene diisocyanate.  Specified cross-linking agents are water, ethylene glycol, propylene glycol, butylene glycol, amylene glycol, trimethylol propane, diethylene glycol, triethylene glycol, pentaglycol, glycerol, sorbitol, triethanolamine, at (b -hydroxyethyl) ether, ethanolamine, 3-aminopropanol, 5-aminopentanol-1, 6-amino-hexanol, 6-amino-5-methyl-hexanol-1, 10-aminodecanol, p-hydroxymethyl benzylamine, ethylene diamine, hexamethylene diamine, 3-methyl-hexamethylene diamine, decamethylene diamine, m-phenylene diamine and hydrozine.  In Example (5) a polyester derived from adipic acid, ethylene glycol and butylene-1,4-glycol is reacted with 1,5-naphthylene diisocyanate and water to form to foamed product which is compressed into a sheet and cured.