Patent GB-621040-A (GB)
Title: An improved adhesive and laminated structure
IPC: C09J121/00
Filed: 1945-12-20
Abstract: A laminated structure for use particularly in wrapping food, drugs, chemicals, and metal parts comprises at least two plies of a sheet material, each ply having a thickness of 0.0009 to 0.002 of an inch bonded by means of a continuous film of a moisture-vapour-resistent adhesive comprising a synthetic rubber, having a Mooney value of not more than 25 in amount between 9 and 15 per cent, a resin in an amount between 37 and 54 per cent, a paraffin wax in an amount between 52 and 53 per cent, the three components being present in amount totaling 100 per cent and a solvent for the components.  The synthetic rubber may be neoprene, a polymer of isoprene or isobutylene, or a copolymer of butadiene or isoprene with styrene or isobutylene.  The resin may be one or more natural resins such as rosin, processed congo or copal; or synthetic resins such as coumarone resins; terpene resins obtained by polymerizing beta pinene; chlorinated diphenyl resins; phenol-formaldehyde resins; terpenemaleic anhydride resins; p  cyclic rubbers, including those obtained from synthetic rubbers such as polyisoprene, polybutadiene and butadiene-styrene copolymers; chlorinated synthetic rubbers especially those derived from polyisobutylene, polyisoprene, butadienestyrene and isoprene-styrene or chlorinated natural rubber. The paraffin wax preferably has a melting point of 150 DEG  F. and may include a micro-crystalline wax.  The solvent may be toluene or a gasoline fraction boiling at 70-90 DEG  C.  A plasticizer is not normally required, but hydrogenated methyl ester of rosin or polyisobutylene may be used for this purpose.  The plies are preferably sheets of rubber hydrochloride, vinyl-chloride-vinylacetate copolymer, cellulose acetate, or regenerated cellulose.ALSO:A laminated structure for use particularly in wrapping food, drugs, chemicals, and metal parts comprises at least two plies of a sheet material, each ply having a thickness of 0.0009 to 0.002 of an inch bonded by means of a continuous film of a moisture-vapour-resistant adhesive comprising a synthetic rubber, having a Mooney value of not more than 25, in amount between 9 and 15 per cent, a resin in an amount between 37 and 54 per cent, a paraffin wax in an amount between 32 and 53 per cent, the three components being present in amount totaling 100 per cent, and a solvent for the components.  The synthetic rubber may be neoprene, a polymer of isoprene or isobutylene, or a copolymer of butadiene or isoprene with styrene or isobutylene.  The resin may be a natural resin such as rosin, processed congo or copal; or a synthetic resin such as coumarone resin; a terpene resin obtained by polymerising beta pinene; a chlorinated diphenyl resin; a phenol-formaldehyde resin; a terpenemaleic anhydride resin; a cyclic rubber, including those obtained from synthetic rubbers such as polyisoprene, polybutadiene, and butadienestyrene copolymers; a chlorinated synthetic rubber especially those derived from polyisobutylene, polyisoprene, butadiene-styrene and isoprene-styrene, and also chlorinated natural rubber.  The paraffin wax preferably has a melting point of 150 DEG F and may include a microcrystalline wax.  The solvent may be toluene or a gasoline fraction boiling at 70 - 90 DEG  C.  A plasticiser is not normally required but hydrogenated methyl ester of rosin or polyisobutylene may be used for this purpose.  The plies are preferably sheets of rubber hydrochloride, vinyl-chloride-vinylacetate copolymer, cellulose acetate, or regenerated cellulose.ALSO:A laminated structure for use particularly in wrapping food, comprises at least two plies of a sheet material, each ply having a thickness of 0.0009 to 0.002 of an inch bonded by means of a continuous film of a moisture-vapour-resistant adhesive comprising a synthetic rubber, having a Mooney value of not more than 25, in amount between 9 and 15 per cent, a resin in an amount between 37 and 54 per cent, a paraffin wax in an amount between 32 and 53 per cent, the three components being present in amount totalling 100 per cent, and a solvent for the components, as described in Group V.  The plies are preferably sheets of rubber hydrochloride, vinyl-chloride-vinylacetate copolymer, cellulose acetate, or regenerated cellulose.