GB922059A - Manufacture of shaped articles - Google Patents

Abstract

A polyurethane is made by stirring 38 parts of a 80:20 mixture of tolylene-2:4- and 2:6-diisocyanates with a mixture of 100 parts of a condensate of glycerol and propylene oxide and 0,25 parts of N:N-dimethylbenzylamine and the mixture kept in an atmosphere of dry nitrogen for 24 hours. To 100 parts of the polymer formed are added 4,72 parts of a mixture of N:N-dimethylcyclohexylamine, ricinoleic acid, water and a polydimethylsiloxane, and the mixture poured into a mould, allowed to expand for 5 minutes and heated at 120 DEG C. for 5 minutes. The final stages of the reaction may be carried out in the presence of a curing agent, e.g. sulphur or dicumyl peroxide. Surface-active agents, e.g. oxyethylated phenols, fatty alcohols such as oleyl alcohol or sulphated dimethyloleate, polyalkylsiloxanes, and copolymers thereof with polyalkylene oxides, flame-retardants such as b -trichloro-ethyl phosphate, and antimony oxide, plasticizers such as tricresyl phosphate and dioctyl phthalate, antioxidants, e.g. tert.-butyl-catechol and sterically hindered phenols, and colouring matter and fillers such as carbon black and silica may be added. A catalyst may be used, e.g. amines, carbonates or other salts of weak acids and alkali or alkali earth metals and organo-metallic compounds from, e.g. tin and lead. Other catalysts, e.g. soluble organic compounds of metals such as iron and manganese acetyl acetonate, tin dilaurate and stannous octoate.ALSO:Polyurethane which may be foamed is moulded in a mould having at least a lining of polypropylene. A polyurethane is made by stirring 38 parts of a 80:20 mixture of tolylene-2: 4- and 2:6-diisocyanates with a mixture of 100 parts of a condensate of glycerol and propylene oxide and 0,25 parts of N:N- dimethylbenzylamine and keeping the mixture in an atmosphere of dry nitrogen for 24 hours. To 100 parts of the polymer formed are added 4,72 parts of a mixture of N; N-dimethylcyclohexylamine, ricinoleic acid, water, and a polydimethylsiloxane, and the mixture poured into a mould, allowed to expand for 5 minutes and heated at 120 DEG C. for 5 minutes. The final stages of the reaction may be carried out in the presence of a curing agent e.g. sulphur or dicumyl peroxide. Surface-active agents e.g. oxyethylated phenols, fatty alcohols such as oleyl alcohol or sulphated dimethyloleate, polyalkylsiloxanes, and copolymers thereof with polyalkylene oxides, flame-retardants such as b -trichloro-ethyl phosphate, and antimony oxide, plasticizers such as tricresyl phosphate and dioctyl phthalate, antioxidants e.g. tertbutyl-catechol and sterically hindered phenols, and colouring matter and fillers such as carbon black and silica may be added. A catalyst may be used e.g. amines, carbonates or other salts of weak acids and alkali or alkali earth metals and organo-metallic compounds from e.g. tin and lead. Other catalysts, e.g. soluble organic compounds of metals such as iron and manganese acetyl acetonate, tin dilaurate and stannous octoate.