Patent GB-653003-A (GB)
Title: A jointing substance and processes for its preparation
Inventor: SQUIR ALAN THOMAS BARRINGTON P
IPC: C09J191/02
Filed: 1948-03-01
Abstract: The process for the preparation of a jointing substance claimed in the parent Specification, wherein a vulcanized base is prepared from a fatty oil using sulphur and a temperature in excess of 220 DEG  C., the base being dissolved or dispersed in an organic solvent therefor and thereafter diluted with an additional organic solvent which is more volatile than the first organic solvent so as to produce a flowable jointing substance, is modified by adding to the original mixture, vulcanized base, or to the jointing substance an agent to modify the cohesive forces therein.  The agent may comprise an anti-frothing agent which is added to the original mixture which also reduces the viscosity of the jointing substance prepared therefrom, or it may comprise a viscosity reducing agent which is added to the solvent for the vulcanized base or to the jointing substance, or it may comprise a viscosity increasing agent which is added to the solvent for the vulcanized base or to the jointing substance, or combinations of the above may be used.  The added agents are used in specified small proportions.  The anti-frothing agents specified comprise silicone anti-frothing agents, particularly the agent known as "Silicone Antifoam A."  The viscosity reducing agents specified comprise amylene, nitromethane, nitroethane, 1-nitropropane, 1-chloro-1-nitropropane, n-propyl alcohol, formaldehyde solution, tetrahydrofurfuryl alcohol, crotonaldehyde, ricinoleic acid, dioctyl phthalate, glyceryl tribenzoate, cyclohexane, cyclohexanol, benzyl alcohol, a methyl furan such as sylvan, and water.  The viscosity increasing agents specified comprise amyl borate, ammonia and secondary amines such as diethylamine.  Other details of the process are as described in the parent Specification.ALSO:The process for the preparation of a jointing substance claimed in the parent Specification, wherein a vulcanized base is prepared from a fatty oil using sulphur and a temperature in excess of 220 DEG C., the base being dissolved or dispersed in an organic solvent therefor and thereafter diluted with an additional organic solvent which is more volatile than the first organic solvent so as to produce a flowable jointing substance, is modified by adding to the original mixture, vulcanized base, or to the jointing substance an agent to modify the cohesive forces therein.  The agent may comprise an anti-frothing agent which is added to the original mixture which also reduces the viscosity of the jointing substance prepared therefrom, or it may comprise a viscosity-reducing agent which is added to the solvent for the vulcanized base or to the jointing substance, or it may comprise a viscosity increasing agent which is added to the solvent for the vulcanized base or to the jointing substance, or combinations of the above may be used.  The added agents are used in specified small proportions.  The anti-frothing agents specified comprise silicone anti-frothing agents, particularly the agent known as "Silicone Antifoam A."  The viscosity reducing agents specified comprise amylene, nitromethane, nitroethane, 1-nitro propane, 1-chloro-1-nitro propane, n-propyl alcohol, formaldehyde solution, tetrahydrofurfuryl alcohol, crotonaldehyde, ricinoleic acid, dioctyl phthalate, glyceryl tribenzoate, cyclohexane, cyclohexanol, benzyl alcohol, a methyl furan such as sylvan, and water.  The viscosity increasing agents specified comprise amyl borate, ammonia and secondary amines such as diethylamine.  Other details of the process are as described in the parent Specification.