LAMAL™ HSA Laminating Adhesives

The polyether urethane component of a two-component laminating adhesive which requires the use of a coreactant. This polyether urethane, in conjunction with coreactant LAMAL™ C, functions as an adhesive for flexible packaging. LAMAL™ HSA adhesive is different from most conventional polyurethane adhesives in that it is not affected by alcohols or small amounts of water. The most commonly used diluents for LAMAL™ HSA adhesive are denatured Ethanol and Isopropanol. LAMAL™ HSA adhesive adheres to a wide variety of substrates including cellophane, treated polyolefins, paper, polyester, polyamides, PVdC coated and metallized materials, vinyl and treated heat sealable layers of coextrusions. The optimum performance of the LAMAL™ HSA adhesive is achieved when substrates are corona treated. LAMAL™ HSA adhesive provides optical clarity, high bond strength, high heat resistance and moderate chemical resistance. The admixed LAMAL™ HSA adhesive is unaffected by high humidity and temperature other than the normal loss of solvent by evaporation. LAMAL™ HSA adhesive should be admixed with LAMAL™ C or LAMAL™ CR-1-80, preferably with a mechanical mixer, then the diluent solvent should be added with continued mixing until uniform. LAMAL™ HSA adhesive diluted with alcohols can be used for laminating heat sensitive substrates and where low levels of retained organic solvent are desirable. LAMAL™ HSA is not compatible with other conventional isocyanate curing polyurethanes and, therefore, all equipment has to be thoroughly cleaned before interchanging the different types of polyurethane.