Cemented lap seam container

Claim 1

A DECORATED, TUBULAR, SHEET METAL CAN BODY HAVING OPPOSED LONGITUDINAL EDGES OVERLAPPED TO FORM A LAP SIDE SEAM WHEREIN THE INTERIOR METAL SURFACE WITHIN THE SEAM IS ADJACENT TO AND OVERLAPS THE OPPOSED EXTERIOR METAL SURFACE WITHIN THE SEAM, THE OPPOSED SURFACES INCLUDED WITHIN SAID LAP SEAM HAVING ADHERED THERETO AN ORGANIC COATING COMPRISING AN EPOXY RESIN, AND AN ORGANIC ADHESIVE DISPOSED IN SAID LAP SEAM AND ADHERED TO THE COATING ON SAID SURFACES, SAID ORGANIC ADHESIVE BEING A LINEAR SUPERPOLYAMIDE HAVING AN INHERENT VISCOSITY OF AT LEAST 0.4; THE COATING ON THE ENTIRE EXTERIOR SURFACE BEING A CURED, DECORATIVE PIGMENTED ORGANIC COATING WHICH EXTENDS INTO THE LAP SEAM, CONSTITUTES A BONDING INTERFACE FOR THE ORGANIC ADHESIVE AND AN ADHERENT BASE RECEPTIVE TO PRINTING OR OTHER DECORATION, SAID CURED COATING BEING DERIVED FROM A COMPOSITION COMPRISING FROM ABOUT 40 TO ABOUT 65 PARTS BY WEIGHT OF A PIGMENT AND FROM ABOUT 60 TO ABOUT 35 PARTS BY WEIGHT OF NON-VOLABILE VEHICLE COMPRISING AN EPOXY ETHER HAVING, BEFORE CURING, AN EPOXIDE EQUIVALENT OF FROM 4245 TO 6,000 AND A NUMBER AVERAGE MOLECULAR WEIGHT OF FROM 1,000 TO 4,000 AND COMPONENTS COREACTIVE THEREWITH UPON APPLICATION OF HEAT OF FORM AN EPOXY RESIN, THE EPOXY RESIN THUS FORMED BEING SELECTED FROM THE GROUP CONSISTING OF (1) EPOXY-PHENOLIC (2) EPOXY-ESTER AND (3) EPOXY-AMINO RESINS.

Claim 9

A method of fabricating a decorated, tubular, metal can body having its opposed longitudinal edges overlapped to form a lap side seam comprising: applying to the entire exterior surface of the sheet metal to be formed into a can body, a decorative pigmented organic coating formulation comprising, as the non-volatile vehicle, about 60 to about 35 parts by weight of an epoxide having before curing, an epoxide equivalent of from 425 to 6,000 and a number average molecular weight of from 1,000 to 4,000 and components coreactive therewith upon application of heat to form an epoxy resin, the epoxy resin thus formed being selected from the group consisting of (1) epoxy-phenolic (2) epoxy-ester and (3) epoxy-amino resins, and about 40 to about 65 parts by weight of a pigment, said pigmented coating constituting a bonding interface for a lap side seam adhesive and an adherent base receptive to printing or other decoration; baking the coated sheet metal at a temperature of at least 300*F, to cure the organic coating thereon; forming said coated sheet metal into a tubular can body, arranged to have a lap side seam wherein the interior metal surface within the finished seam is adjacent to and overlaps the opposed exterior metal surface within the seam, there being applied to at least one of said opposed surfaces forming the seam an organic adhesive comprising a linear superpolyamide having an inherent viscosity of at least 0.4; and bonding said opposed surfaces to form the finished seam, said decorative pigmented coating extending into the lap seam thus produced.

Claim 10

A method of fabricating a decorated, tubular, metal can body having its opposed longitudinal edges overlapped to form a lap side seam comprising: applying to the entire exterior surface of the sheet metal to be formed into a can body, a decorative pigmented organic coating formulation comprising, as the non-volatile vehicle, about 60 to about 35 parts by weight of an epoxide having before curing, an epoxide equivalent of from 425 to 6,000 and a number average molecular weight of from 1,000 to 4,000 and components coreactive therewith upon application of heat to form an epoxy resin, the epoxy resin thus formed being selected from the group consisting of (1) epoxy-phenolic (2) epoxy-ester and (3) epoxy-amino resins, and about 40 to about 65 parts by weight of a pigment, said pigmented coating constituting a bonding interface for a lap side seam adhesive and an adherent base receptive to printing or other decoration; baking the coated sheet metal at a temperature of at least 300*F, to cure the organic coating thereon; forming said coated sheet metal into a tubular can body, arranged to have a lap side seam wherein the interior metal surface within the finished seam is adjacent to and overlaps the opposed exterior metal surface within the seam, there being applied to at least one of said opposed surfaces forming the seam an organic adhesive comprising a linear superpolyamide having an inherent viscosity of at least 0.4; and bonding said opposed surfaces to form the finished seam, said decorative pigmented coating extending into the lap seam thus produced.

Claim 23

A method of fabricating a decorated, tubular, sheet metal can body having its opposed longitudinal edges overlapped to form a lap side seam, comprising: applying to the interior surface of the sheet metal to be formed into a can body an organic coating comprising a 1,2-epoxide resin having before curing an epoxide equivalent of from about 425 to 6,000 and a number average molecular weight of from 1, 000 to 4,000; applying to the exterior surface of the sheet metal to be formed into a can body a decorative pigmented organic coating formulation comprising, as the non-volatile vehicle, 60-35 parts by weight of an epoxide having before curing an epoxide equivalent of from 425 to 6,000 and a number average molecular weight of from 1,000 to 4,000 and components co-reactive therewith upon application of heat to form an epoxy resin, the epoxy resin thus formed being selected from the group consisting of (1) epoxy-phenolic, (2) epoxy-ester and (3) epoxy-amino resins, and 40-65 parts by weight titanium dioxide pigment, said pigmented coating constituting a bonding interface for a lap side seam adhesive and an adherent base receptive to printing or other decoration; baking the coated sheet metal at a temperature of at least 300*F to cure the organic coatings thereon; forming said coated sheet metal into a tubular can body, arranged to have a lap side seam wherein the coated interior metal surface within the finished seam is adjacent to and overlaps the similarly coated opposed exterior surface within the seam, there being applied to at least one of said opposed coated surfaces forming the seam an organic adhesive comprising a linear superpolyamide having an inherent viscosity of at least 0.4; and bonding said opposed surfaces to form the finished seam by heating said organic adhesive to a tacky condition and then pressing said opposed surfaces between chilled supporting surfaces, said pigmented coating extending within the lap seam and said steps of applying said organic adhesive, forming said tubular shape, and bonding by heating and pressing together said opposed surfaces being carried out automatically.

Claim 24

A method of fabricating a decorated, tubular, sheet metal can body having its opposed longitudinal edges overlapped to form a lap side seam, comprising: applying to the interior surface of the sheet metal to be formed into a can body an organic coating comprising a 1,2-epoxide resin having before curing an epoxide equivalent of from about 425 to 6,000 and a number average molecular weight of from 1, 000 to 4,000; applying to the exterior surface of the sheet metal to be formed into a can body a decorative pigmented organic coating formulation comprising, as the non-volatile vehicle, 60-35 parts by weight of an epoxide having before curing an epoxide equivalent of from 425 to 6,000 and a number average molecular weight of from 1,000 to 4,000 and components co-reactive therewith upon application of heat to form an epoxy resin, the epoxy resin thus formed being selected from the group consisting of (1) epoxy-phenolic, (2) epoxy-ester and (3) epoxy-amino resins, and 40-65 parts by weight titanium dioxide pigment, said pigmented coating constituting a bonding interface for a lap side seam adhesive and an adherent base receptive to printing or other decoration; baking the coated sheet metal at a temperature of at least 300*F to cure the organic coatings thereon; forming said coated sheet metal into a tubular can body, arranged to have a lap side seam wherein the coated interior metal surface within the finished seam is adjacent to and overlaps the similarly coated opposed exterior surface within the seam, there being applied to at least one of said opposed coated surfaces forming the seam an organic adhesive comprising a linear superpolyamide having an inherent viscosity of at least 0.4; and bonding said opposed surfaces to form the finished seam by heating said organic adhesive to a tacky condition and then pressing said opposed surfaces between chilled supporting surfaces, said pigmented coating extending within the lap seam and said steps of applying said organic adhesive, forming said tubular shape, and bonding by heating and pressing together said opposed surfaces being carried out automatically.