Abstract The extent of the usefulness of glass and polycarbonate in specialty windows depends on the properties of these two materials and the characteristics of transparent adhesives for the bonding of the polycarbonate and the glass. Accordingly, a transparent terpolymer is disclosed as an adhesive for bonding laminates with layers of polycarbonate and glass. The adhesive comprises specific terpolymers of ethylene/vinyl acetate/vinyl alcohol, lightly crosslinked with a peroxide preferably to a level where the thermoplastic nature is maintained for laminating. Importantly excellent toughness and low temperature properties are provided by the terpolymer and these are maintained while the higher temperature properties are enhanced through the crosslinking.
AN OPTICALLY CLEAR ADHESIVE FOR GLASS-GLASS, GLASS-POLYCARBONATE AND POLYCARBONATE-POLYCARBONATE LAMINATES WHICH COMPRISES AN ETHYLENE/VINYL ACETATE COPOLYMER HAVING FROM ABOUT 40 TO ABOUT 65 WEIGHT PERCENT VINYL ACETATE, SAID COPOLYMER BEING PARTIALLY HYDROLYZED IN A MINERAL ACID MEDIUM TO FORM A TERPOLYMER HAVING A VINYL ALCOHOL CONTENT FROM ABOUT 3 TO ABOUT 30 WEIGHT PERCENT, SAID TERPOLYMER BEING COMPOUNDED AND PARTIALLY CROSS-LINKED WITH FROM ABOUT 0.5 TO ABOUT 3.0 WEIGHT PERCENT OF A DIACYL PEROXIDE.
Claim 2
Dependent Claim
74 words
AN OPTICALLY CLEAR ADHESIVE FOR GLASS-GLASS, GLASS-POLYCARBONATE AND POLYCARBONATE-POLYCARBONATE LAMINATES WHICH COMPRISES AN ETHYLENE/VINYL ACETATE COPOLYMER HAVING FROM ABOUT 40 TO ABOUT 65 WEIGHT PERCENT VINYL ACETATE, SAID COPOLYMER BEING PARTIALLY HYDROLYZED IN A MINERAL ACID MEDIUM TO FORM A TERPOLYMER HAVING A VINYL ALCOHOL CONTENT FROM ABOUT 3 TO ABOUT 30 WEIGHT PERCENT, SAID TERPOLYMER BEING COMPOUNDED AND PARTIALLY CROSS-LINKED WITH FROM ABOUT 0.5 TO ABOUT 3.0 WEIGHT PERCENT OF A DIACYL PEROXIDE.
Claim 3
Dependent Claim
12 words
An adhesive of claim 1 wherein said acid medium comprises sulfuric acid.