Barrier coatings using polyacids
An impermeable coating and coating technology, applied in the field of coatings that prevent the penetration of fragrance, aroma and gas, can solve the problems of cracking, loss of tensile properties, and unsatisfactory air permeability.
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Embodiment 1
[0049] Each coating was prepared, then coated onto an oriented polypropylene substrate, and each coating was evaluated using the same method as exemplified in the description below relating to the evaluation of polymaleic acid.
[0050] The following describes the preparation of polymaleic acid based coatings and their application to oriented polypropylene substrates and subsequent testing.
[0051] A solution was prepared by dissolving 20 g of polymaleic acid (Belcene 710 from FMC) in 80 g of HPLC grade methanol from Aldrich. Coats of the solution were applied on freshly corona treated oriented polypropylene film using an air driven mechanical benchtop coater, a #3 (green) K-belt, theoretical wet deposit 24 microns. The coatings were dried at ambient conditions for 24 hours prior to testing for oxygen transmission rate.
[0052] Typical environmental conditions include room temperature (RT) of 22-28°C at a relative humidity of 30-60%. The resulting coatings were visually dr...
Embodiment 2
[0059] Each of the compositions shown in Table 2 was prepared by dissolving the relevant acid in an appropriate solvent, ie methanol (unless otherwise stated), followed by the addition of gamma-aminopropyltrimethoxysilane to the acid solution. Finally any additional ingredients such as wetting agents and / or catalysts are dissolved in the mixture.
[0060] After the above preparative steps the test steps were carried out as described in Example 1.
[0061] A specific example of the method performed is as follows:
[0062] 10 g of polymaleic acid (Belcene 710 from FMC) was dissolved in 80 g of HPLC grade methanol from Aldrich, and 10 g of γ-aminopropyltrimethoxysilane (sold by Witco under the trademark Siquest A-1100) were added under stirring. ) to prepare the solution. A freshly corona treated oriented polypropylene film substrate was treated with the resulting solution using a #3 (green) metering rod from RK. Coatings were dried for 24 hours prior to testing. Oxygen trans...
Embodiment 3
[0066] A substrate is treated by the method of the invention with a composition comprising acid, solvent, methanol (unless otherwise specified) and a third component as indicated. In each example, the substrate was oriented polypropylene unless otherwise stated. At 50% relative humidity, the OTR of untreated polybutylene terephthalate (PET) substrate was 125, and at 50% relative humidity, the OTR of untreated low density polyethylene was 4443, when tested by this The OTR was so dramatically reduced when the inventive method treated these substrates.
[0067] Each composition was prepared using the same method as in Example 2.
[0068] After preparation of the composition, the application of the coating and subsequent steps were carried out as described in Example 1, the results are shown in Table 3.
[0069] coating composition
[0070] In the above examples, some of the resulting coatings were subsequently treated with electron beam irradiation (EB).
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