Patent ID: 6713184
Filing Date: 2004-03-30
Classification: B32B,C08L,C09J,D04H,Y10T

Abstract:
An adhesive composition comprising component A having a total enthalpy of fusion of at most 20 mJ/mg and component B having a glass transition temperature of at most 60Â° C. whereina) component A comprises at least one aromatic-containing polyester with a molecular weight (Mn) of at least 8000 consisting essentially of (i) a first acid selected from the group consisting of succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, cyclohexane dicarboxylic acid, cyclohexene dicarboxylic acid, cyclohexadiene dicarboxylic acid, endomethylene hexahydrophthalic acid, cyclohexane tricarboxylic acid, phthalic acid, o-phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, anhydrides thereof, esters thereof with an alcohol containing from 1 to about 5 carbon atoms and combinations thereof; (ii) a second acid different from the first acid and selected from the group consisting of succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, cyclohexane dicarboxylic acid, cyclohexene dicarboxylic acid, cyclohexadiene dicarboxylic acid, endomethylene hexahydrophthalic acid, cyclohexane tricarboxylic acid, phthalic acid, o-phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, anhydrides thereof, esters thereof with an alcohol containing from 1 to about 5 carbon atoms, and combinations thereof, and (iii) at least one alcohol, wherein at least one of the first acid or second acid is an aromatic-containing acid; and b) component B comprises at least one polyester with a molecular weight (Mn) of less than 8000 consisting essentially of (i) a first acid selected from the group consisting of succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, cyclohexane dicarboxylic acid, cyclohexene dicarboxylic acid, cyclohexadiene dicarboxylic acid, endomethylene hexahydrophthalic acid, cyclohexane tricarboxylic acid, phthalic acid, o-phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, anhydrides thereof, esters thereof with an alcohol containing from 1 to about 5 carbon atoms and combinations thereof; (ii) a second acid different from the first acid and selected from the group consisting of succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, cyclohexane dicarboxylic acid, cyclohexene dicarboxylic acid, cyclohexadiene dicarboxylic acid, endomethylene hexahydrophthalic acid, cyclohexane tricarboxylic acid, phthalic acid, o-phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, anhydrides thereof esters thereof with an alcohol containing from 1 to about 5 carbon atoms and combinations thereof; and (iii) at least one alcohol, the adhesive having a melt viscosity of 500 to 25,000 mPas (Brookfield RVT DVII, 140Â° C., spindle 27) and a softening point of 70 to 100Â° C. (ASTM E28).