Process of solvent-free lamination using isocyanate/amine adhesives

Claim 1

A method for the production of laminated films employing a two-component non-solvent adhesive system, which comprises the steps of applying a thin film of a mixture of (a) the reaction product of 1 mole of polyoxyalkylene glycol having 2 to 4 carbon atoms in the alkylene and 2 moles of a diisocyanate, said reaction product having a molecular weight of from 2000 to 5000, and (b) a compound selected from the group consisting of (i) the reaction product of an alkanepolyol having 3 to 10 carbon atoms and 3 to 6 hydroxyl groups or a cycloalkane polyol having 6 to 8 carbon atoms and 3 to 6 hydroxy groups with a diisocyanate, wherein 1 mole of diisocyanate is reacted per hydroxy group of said polyol; (ii) the reaction product of one mole of water and three moles of a diisocyanate; (iii) an aromatic triisocyanate; and (iv) a polyisocyanate, said compound (b) having at least three isocyanate groups being present in an amount of 0.5 to 20% by weight, relative to said reaction product (a), to one of two films to be bonded together, applying to the other film to be bonded a thin film of at least one second reaction product of 1 mole of polyoxyalkylene glycol having 2 to 4 carbon atoms in the alkylene with 2 moles of acrylonitrile, which was subsequently catalytically hydrogenated, said reaction product having a molecular weight of from 300 to 2000, the application of both thin films being in such amounts that the molar ratio of isocyanate groups to amine groups is from 1:1 to 5:1 and the two components together being present in an amount of 0.5 to 5.0 gm/m 2 , pressing the coated sides of the two coated films together whereby adhesion between the coated films is initiated, and recovering said laminated films.

Claim 2

A method for the production of laminated films employing a two-component non-solvent adhesive system, which comprises the steps of applying a thin film of a mixture of (a) the reaction product of 1 mole of polyoxyalkylene glycol having 2 to 4 carbon atoms in the alkylene and 2 moles of a diisocyanate, said reaction product having a molecular weight of from 2000 to 5000, and (b) a compound selected from the group consisting of (i) the reaction product of an alkanepolyol having 3 to 10 carbon atoms and 3 to 6 hydroxyl groups or a cycloalkane polyol having 6 to 8 carbon atoms and 3 to 6 hydroxy groups with a diisocyanate, wherein 1 mole of diisocyanate is reacted per hydroxy group of said polyol; (ii) the reaction product of one mole of water and three moles of a diisocyanate; (iii) an aromatic triisocyanate; and (iv) a polyisocyanate, said compound (b) having at least three isocyanate groups being present in an amount of 0.5 to 20% by weight, relative to said reaction product (a), to one of two films to be bonded together, applying to the other film to be bonded a thin film of at least one second reaction product of 1 mole of polyoxyalkylene glycol having 2 to 4 carbon atoms in the alkylene with 2 moles of acrylonitrile, which was subsequently catalytically hydrogenated, said reaction product having a molecular weight of from 300 to 2000, the application of both thin films being in such amounts that the molar ratio of isocyanate groups to amine groups is from 1:1 to 5:1 and the two components together being present in an amount of 0.5 to 5.0 gm/m 2 , pressing the coated sides of the two coated films together whereby adhesion between the coated films is initiated, and recovering said laminated films.

Claim 12

A method for the production of laminated films employing a two-component non-solvent adhesive system, which comprises the steps of applying a thin film of at least one reaction product (a) of 1 mole of polyoxyalkylene glycol having 2 to 4 carbon atoms in the alkylene and 2 moles of a diisocyanate, said reaction product (a) having a molecular weight of from 2000 to 5000, to one of two films to be bonded together, applying to the other film to be bonded a thin film of at least one reaction product (b) of 1 mole of polyoxyalkylene glycol having 2 to 4 carbon atoms in the alkylene with 2 moles of acrylonitrile, which was subsequently catalytically hydrogenated, said reaction product (b) having a molecular weight of from 300 to 2000, the application of both thin films being in such amounts that the molar ratio of isocyanate groups to amine groups is from 1:1 to 5:1 and the two components together being present in an amount of 0.5 to 5.0 gm/m 2 , pressing the coated sides of the two coated films together whereby adhesion between the coated films is initiated, and recovering said laminated films.

Claim 13

A method for the production of laminated films employing a two-component non-solvent adhesive system, which comprises the steps of applying a thin film of at least one reaction product (a) of 1 mole of polyoxyalkylene glycol having 2 to 4 carbon atoms in the alkylene and 2 moles of a diisocyanate, said reaction product (a) having a molecular weight of from 2000 to 5000, to one of two films to be bonded together, applying to the other film to be bonded a thin film of at least one reaction product (b) of 1 mole of polyoxyalkylene glycol having 2 to 4 carbon atoms in the alkylene with 2 moles of acrylonitrile, which was subsequently catalytically hydrogenated, said reaction product (b) having a molecular weight of from 300 to 2000, the application of both thin films being in such amounts that the molar ratio of isocyanate groups to amine groups is from 1:1 to 5:1 and the two components together being present in an amount of 0.5 to 5.0 gm/m 2 , pressing the coated sides of the two coated films together whereby adhesion between the coated films is initiated, and recovering said laminated films.