Patent GB-369725-A (GB)
Title: Improvements in the manufacture and production of conversion products of rubber
IPC: C08C19/04
Filed: 1931-02-23
Abstract: Conversion products of rubber are prepared by acting on rubber and the like in solution in rubber solvents with up to 1 molecular proportion of a neutral peroxide of a carboxylic acid for each diolefine group present.  Suitable peroxides mentioned are aliphatic peroxides such as acetyl peroxide, succinic peroxide, propionyl peroxide, mono-, chloro, or mono-bromo-acetyl peroxide, which give products soluble in liquid hydrocarbons or liquid halogenated hydrocarbons, while aromatic peroxides such as benzoyl peroxide, phthalyl peroxide, cinnamic peroxide, or acetyl salicylic peroxide give products which do not dissolve but only swell in the above solvents.  The products are stated to be acyl derivatives of a hydroxylated rubber.  The acyl group may be split off by acid or alkaline hydrolysis to yield products similar to those obtained by the process of Specification 369,716.  The products may be moulded when hot, their plasticity being varied within wide limits by the incorporation of softening agents, colouring materials and fillers. If compounds with alkyl and acyl cellulose derivatives are made they are soluble in organic solvents and may be used for the preparation of lacquers and varnishes, films or artificial threads.  In an example 100 parts of acetic anhydride in 500 parts of ethyl ether is shaken at 50 DEG  C. for 1 hour with a suspension of 110 parts of barium peroxide in 150 parts of water.  The ethereal layer is separated, dried, and the ether distilled.  The acetyl peroxide is dissolved in benzene and added to 1000 parts of rubber solution containing 50 parts of rubber and allowed to stand 24 hours.  The solvent is removed in steam and a colourless product is obtained.ALSO:Conversion products of rubber are prepared by acting on rubber and the like in solution in rubber solvents with up to 1 molecular proportion of a neutral peroxide of a carboxylic acid for each diolefine group present.  Suitable peroxides mentioned are aliphatic peroxides such as acetyl peroxide, succinic peroxide, propionyl peroxide mono chloro or monobromo-acetyl peroxide, which give products soluble in liquid hydrocarbons or liquid halogenated hydrocarbons, while aromatic peroxides such as benzoyl peroxide, phthalyl peroxide, cinnamic peroxide, or acetyl salicylic peroxide give products which do not dissolve but only swell in the above solvents.  The products are stated to be acyl derivatives of a hydroxylated rubber.  The acyl group may be split off by acid or alkaline hydrolysis to yield products similar to those obtained by the process of Specification 369,716.  The products may be moulded when hot, their plasticity being varied within wide limits by the incorporation of softening agents, colouring materials and fillers. If compounds with alkyl and acyl cellulose derivatives are made they are soluble in organic solvents and may be used for the preparation of lacquers and varnishes, films or artificial threads.  In an example 100 parts of acetic anhydride in 500 parts of ethyl ether is shaken at 5 DEG  C. for 1 hour with a suspension of 110 parts of barium peroxide in 150 parts of water.  The ethereal layer is separated, dried, and the ether distilled.  The acetyl peroxide is dissolved in benzene and added to 1000 parts of rubber solutions containing 50 parts of rubber and allowed to stand 24 hours.  The solvent is removed in steam and a colourless product is obtained.ALSO:Conversion products of rubber are prepared by acting on rubber and the like in solution in rubber solvents with up to 1 molecular proportion of a neutral peroxide of a carboxylic acid for each diolefine group present.  Suitable peroxides mentioned are aliphatic peroxides such as acetyl peroxide, succinic peroxide, propionyl peroxide, mono chloro- or mono-bromo-acetyl peroxide, which give products soluble in liquid hydrocarbons or liquid halogenated hydrocarbons, while aromatic peroxides such as benzoyl peroxide, phthalyl peroxide, cinnamic peroxide, or acetyl salicylic peroxide give products which do not dissolve but only swell in the above solvents.  The products are stated to be acyl derivatives of a hydroxylated rubber.  The acyl group may be split off by acid or alkaline hydrolysis to yield products similar to those obtained by the process of Specification 369,716.  The products may be moulded when hot, their plasticity being varied within wide limits by the incorporation of softening agents, colouring materials and fillers. If compounds with alkyl and acyl cellulose derivatives are made they are soluble in organic solvents and may be used for the preparation of lacquers and varnishes, films, or artificial threads.  In an example 100 parts of acetic anhydride in 500 parts of ethyl ether is shaken at 50 DEG  C. for one hour with a suspension of 110 parts of barium peroxide in 150 parts of water.  The ethereal layer is separated, dried, and the ether distilled.  The acetyl peroxide is dissolved in benzene and added to 1000 parts of rubber solutions containing 50 parts of rubber and allowed to stand 24 hours.  The solvent is removed in steam and a colourless product is obtained.