Radiation-cured, laminated flexible packaging material, and radiation-curable, adhesive composition
A technology of radiation curing and adhesives, applied in non-polymer organic compound adhesives, non-polymer adhesive additives, packaging, etc., which can solve the problems of short service life, time delay, and delamination of mixed components
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Embodiment 1
[0091] A UV / E-beam curable titanate compound was prepared by reacting 4.4 molar equivalents of a carboxylic acid functional monomer derived from acrylic acid-2 - Half-ester of hydroxyethyl ester (HEA) and succinic anhydride (HEA-succinate monomer). Isopropanol was removed by heating the mixture under vacuum. The product obtained was a highly viscous, clear, reddish liquid. TiO was determined gravimetrically by heating to dry ash 2 The calculated titanium content is 4.8%. This result is in good agreement with the expected theoretical titanium content of 4.8%, thus proving that the product is a novel titanate compound obtained by introducing 4 moles of HEA-succinate per mole of titanium.
Embodiment 2
[0093] The organotitanate compound from Example 1 was used in the adhesive formulations shown in Table 1. For comparison, the "A" formulation contained no titanate. A thin film (approximately 0.1 mil) of each adhesive was applied to each layer of the flexible packaging material. A second layer of flexible packaging material was placed on the wet adhesive and irradiated with an electron beam of 165 kV at a dose of 3.0 Mrads to cure the resulting laminate. The bond strength of the resulting laminates was measured using a tensile testing apparatus using a T-peel configuration at a rate of 12 inches per minute. The results are listed in the table below. The results show that the bond strength of oPP / metallized oPP laminates is improved in the presence of titanate compounds. The results also showed that titanate improved the water resistance of both polyester (PET) film laminates.
[0094] Adhesive formulation (wt%)
Embodiment 3
[0096] A series of titanate compounds were added to the UV curable laminating adhesives shown in Table 2. The adhesive was coated onto the polypropylene film at a thickness of approximately 0.2 mil. A second layer of polypropylene film was placed over the wet adhesive. The adhesive was then cured by UV exposure with a 300 w / in medium pressure mercury arc lamp through the top film to form a laminate at a transport speed of 100 ft / min. The adhesive strength of the laminate was measured by a T-peel test. The results show that the bond strength increases significantly in the presence of titanate compounds. Store at room temperature for one month to check stability. The mixture containing triethanolamine titanate remained liquid without sediment and without significant change in viscosity.
[0097] Adhesive formulation (parts by weight)
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