Abstract A method of bonding rubber to magnesium and its alloys, which comprises cleaning and etching the metal surface, applying a coat of thermosetting nitrile-phenolic adhesive to the cleaned and etched metal surface, drying the adhesive, curing the adhesive to form an impervious film, and cooling the cured adhesive-bearing structure to room temperature. Then, applying a coat of the same adhesive to the surface of both the rubber to be bonded to the metal and to the cured film of adhesive on the metal, drying the coatings, associating the adhesive-coated parts in adhesive contacting relationship, and curing the uncured adhesive by sufficient heating while applying pressure thereto. Excellent printing rolls can be made this way.
A PRINTING ROLL COMPRISING AN OUTER PATTERNED AND CURED SYNTHETIC RUBBER COVER, AN ETCHED INNER MAGNESIUM CORE, AND LAYERS OF CURED ADHESIVE INTERPOSED BETWEEN SAID OUTER COVER AND INNER CORE, SAID LAYERS OF ADHESIVE COMPRISING A FIRST-CURED IMPERMEABLE BARRIER LAYER BONDED TO SAID MAGNESIUM CORE, AND A SECOND-CURED LAYER OF THE SAME ADHESIVE INTERPOSED BETWEEN AND BONDING SAID IMPERMEABLE LAYER TO SAID RUBBER COVER, THE COMPOSITION OF SAID ADHESIVE LAYERS COMPRISING A PHENOL-FORMALDEHYDE RESIN AND A BUTADIENE-ACRYLONITRILE COPOLYMER.
Claim 2
Dependent Claim
78 words
A PRINTING ROLL COMPRISING AN OUTER PATTERNED AND CURED SYNTHETIC RUBBER COVER, AN ETCHED INNER MAGNESIUM CORE, AND LAYERS OF CURED ADHESIVE INTERPOSED BETWEEN SAID OUTER COVER AND INNER CORE, SAID LAYERS OF ADHESIVE COMPRISING A FIRST-CURED IMPERMEABLE BARRIER LAYER BONDED TO SAID MAGNESIUM CORE, AND A SECOND-CURED LAYER OF THE SAME ADHESIVE INTERPOSED BETWEEN AND BONDING SAID IMPERMEABLE LAYER TO SAID RUBBER COVER, THE COMPOSITION OF SAID ADHESIVE LAYERS COMPRISING A PHENOL-FORMALDEHYDE RESIN AND A BUTADIENE-ACRYLONITRILE COPOLYMER.
Claim 3
Dependent Claim
38 words
The printing roll of claim 1 wherein the composition of the adhesive layers includes about 59 percent butadiene and about 41 percent acrylonitrile, and wherein the rubber:resin ratio is in the range of from about 1:05 to 1.5.