Patent GB-356769-A (GB)
Title: Improvements in or relating to laminated products
IPC: C08C19/00
Filed: 1930-06-07
Abstract: A resinoid composition sheet which may be in the hardened or infusible condition, or a sheet of material such as paper or cloth impregnated with a reactive resinoid, is bonded to a base material such as steel or other metal or wood by a cement which contains a rubber isomer or rubber in an extended condition.  Several plies may be used.  The sheets may be bonded by heat and pressure, the reactive resin being thus brought to the infusible condition, but if the resinoid sheet used is already hardened, the cement may be allowed to set without heat.  Resinoids specified are those of the phenolformaldehyde, the glyptal, and the urea types.  Cements specified are (1) a rubber isomer made by heating rubber with 4-5 per cent of sulphuric acid, or the equivalent of a sulphonic acid such as p-phenol sulphonic acid, or p-toluene sulphonyl chloride, for 4-10 hours at 120-140 DEG C., and removing the excess of acid &c. by washing with water; and (2) a rubber cement or solution extended by adding to the solution the hot product obtained by reacting 60 parts tung oil and 40 parts of cresol in the presence of phosphoric acid and further reacting with 15 parts of hexamethylenetetramine.  In using the extended rubber solution, the coated surfaces are heated to drive off solvents before pressing the plies together.  The cement may contain plasticizers such as tung oil, mineral rubber, &c., and preservatives such as benzidine, and the rubber isomer may be extended with reactive or reacted resinoids including those of the phenol-oil-aldehyde type. In forming the compound sheet, untreated paper or cloth may be laid between the base material and the surface sheet or sheets which are impregnated with a reactive resinoid, and the stack may be pressed at 100-2000 lbs. per square inch and 100-135 DEG  C.ALSO:A resinoid composition sheet which may be in the hardened or infusible condition, or a sheet of material such as paper or cloth impregnated with a reactive resinoid, is bonded to a base material such as steel or other metal or wood by a cement which contains a rubber isomer or rubber in an extended condition.  Several plies may be used.  The sheets may be bonded by heat and pressure, the reactive resin being thus brought to the infusible condition, but if the resinoid sheet used is already hardened the cement may be allowed to set without heat.  Resinoids specified are those of the phenolformaldehydes, the glyptal, and the urea types.  Cements specified are (1) a rubber isomer made by heating rubber with 4 to 5 per cent of sulphuric acid, or the equivalent of a sulphonic acid such as p-phenol sulphonic acid, or p-toluene sulphonyl chloride, for 4 to 10 hours at 120 DEG  to 140 DEG  C., and removing the excess of acid &c., by washing with water; and (2) a rubber cement or solution extended by adding to the solution the hot product obtained by reacting 60 parts tung oil and 40 parts of cresol in the presence of phosphoric acid and further reacting with 15 parts of hexamethylenetetramine.  In using the extended rubber solution, the coated surfaces are heated to drive off solvents before pressing the plies together.  The cement may contain plasticizers such as tung oil, mineral rubber, &c., and preservatives such as benzidine, and the rubber isomer may be extended with reactive or reacted resinoids including those of the phenol-oil-aldehyde type.  In forming the compound sheet, untreated paper or cloth may be laid between the base material and the surface sheet or sheets which are impregnated with a reactive resinoid, and the stack may be pressed at 100 to 2000 lbs. per square inch and 100 DEG  to 135 DEG  C.