Radiation-curable, solvent-free and printable precursor of an adhesive
A radiation curing, adhesive technology, applied in non-polymer organic compound adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problem of shear value not meeting actual requirements
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Embodiment 1
[0207] The components of Example 1 shown in Table 1 were mixed to prepare a binder precursor. The amounts of mono- and di-acrylate functional oligomers listed in Table 1 were calculated from the amounts of GENOMER 4188 or 4269. Similarly, the given amount of this acyl monomer comprises the amount of the monomers EHA and 2-acrylic acid-2(((propenyl-amino)carbonyl)oxy)ethyl ester (=GENOMER 1122) contained in GENOMER 4188 or 4269 .
[0208] The adhesive precursor was applied to a 175 micron thick polyester film at a thickness of 50 microns using a knife coater.
[0209] First, the binder precursor was partially cured using a UV dryer Natograph Ltd - UV Dryer type 90-0220-T8 (available from Natograph Ltd., Nothingham, UK; commonly used for drying and curing screen printed inks). Both sides of the polyester film (Melinex ST726 from DuPont) were primed with an acrylate primer and used as a standard sample. The energy incident on the binder precursor layer during the partial curin...
Embodiment 2-5
[0214] Example samples 2-5 were prepared and tested in the same manner as described in Example 1. The compositions of the binder precursors of Examples 2-5 are shown in Table 1. There are higher levels of acryloylmorpholine (ACMO) (Examples 2, 3 and 5) and significant amounts of difunctional polyester urethane acrylate oligomers (Examples 4 and 5). The amounts of mono- and di-acrylate functional oligomers shown in Table 1 were calculated from the amounts of GENOMER 4188 or 4269. Similarly, the given amounts of such monomers include the amounts of the monomers EHA and 2-acrylic acid-2(((acryloyl-amino)carbonyl)oxy)ethyl ester (=GENOMER 1122) contained in GENOMER 4188 or 4269.
[0215] Adhesive joints formed between two substrates were tested by the method indicated in the test method above. Table 2 shows the test results. The shear bond failure tests of Examples 2-5 show that the values are all in excess of 100°C.
[0216] In a separate experiment, the binder precursor co...
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