Composition useful as a pressure sensitive adhesive, its use and adhesive articles comprising it
a technology of pressure sensitive adhesives and adhesive articles, applied in the direction of ester polymer adhesives, adhesive types, etc., can solve the problems of loss of internal strength and environmental stability, high cost, and low long-term aging, and achieve improved high breathability and skin compatibility, and the effect of improving the tack and adhesive properties
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example 1
[0098]Preparation of a PSA
[0099]Monomers:[0100]50 g of Bisomer MPEG 350 MA (methoxy polyethyleneglycol methacrylate, average molecular weight 350 g / mol);[0101]2 g of 4-benzoyl-4′-(2-methyl-propenoyl)-diphenylthioether;[0102]283 g of 2-ethylhexyl acrylate, 140.0 g of methyl acrylate and 25.0 g of acrylic acid.
[0103]A thermo-radical initiator solution was prepared dissolving 0.8 g of t-butyl peroxy-2-ethylhexanoate in 140 g of a mixture 55:45 of ethanol / ethyl acetate. In a glass flask equipped with thermometer, mechanical stirrer, purged with nitrogen 80 g of solvent (composed with ethanol and ethyl acetate 1.22:1), 250 g of monomer mixture described above and 70.4 g of a catalyst solution were charged under stirring. The temperature was increased up to 77-80° C. The mixture was refluxed for 30 minutes and the remaining monomer mixture and the catalyst solution were uniformly added into the reactor over 90 minutes. At the end of the addition the monomer tank was washed with 50 g of a ...
example 2
[0105]Evaluation of the Performances of the PSA
[0106]The PSA of Example 1, after solvent evaporation under vacuum. was used as a hot melt, to coat a sample with a coating weight of 30 g / m2 onto a PET 36 microns film.
[0107]After crosslinking with a Hg-doped UV-C lamp, 30 mJ / cm2 the adhesive performance was evaluated as follow:
PerformanceUMValueMethod1Peel ss 20 minG / 25 mm1075FINAT Test Method (FTM1)2QS ssG / 25 mm1220FINAT Test Method (FTM9)3Shear (1 / 2″)2min960AFINAT Test Method (FTM8)4Shear (1″)2h>100FINAT Test Method (FTM8)1) The Peel adhesion (180° on stainless steel (ss)) at a dwell time of 20 min2) The loop tack (=QS ss) was measured on stainless steel3) The shear value was measured at room temperature using a weight of 1 kg at surface areas of 1 square inch (½″)2)4) The shear value was measured at room temperature using a weight of 1 kg at surface areas of 1 square inch ((1″)2)
example 3
[0108]Application Tests
[0109]Evaluation of the Photoinitiating Activity
[0110]Two clear formulations were prepared to evaluate the performance of two PSAs comprising different copolymerizable benzophenones:[0111]the PSA of the invention, comprising 4-benzoyl-4′-(2-methyl-propenoyl)-diphenylthioether as component (c) and[0112]a PSA not according to the invention, comprising 4-acryloyloxy-benzophenone (as comparative test).
[0113]To a mixture of bisphenol A epoxy diacrylate (Ebecryl® 605) (93.06%), and silicone diacrylate (Ebecryl® 350) (0.94%), the copolymerizable benzophenone (3%) and ethyl 4-(dimethylamino)benzoate (3%) are added under stirring to obtain a clear solution. The formulations are spread on a polyethylene support as a thick film of 6 μm with a bar coater and after UV exposure (Hamamatsu Lightningcure LC8 equipped with Hg / Xe lamp 200 W and intensity reduced to 20%) the IR spectrum (Jasco FT / IR 430) is recorded.
[0114]The experiments were carried out by measuring the areas o...
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