Hybrid sol-gel barrier coatings

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428 343, 428447, 428451, 428452, 522 84, 522 99, 528 32, 528 38, 528 39, 524837, B32B 904, B32B 906, C08G 7718, C08G 7702

Patent

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057765650

ABSTRACT:
Hybrid sol-gel barrier coatings are produced by hydrolyzing a tetrafunctional alkoxide silicate and a silane having one or two pendant crosslinkable groups in water or water plus a water miscible organic solvent and a catalytic amount a protic acid, Lewis acid, or metal chelate, until a viscosity of from about 2,600 to about 3,200 cps is obtained. The product is then diluted water or water plus a water miscible organic solvent, optionally containing a protic acid, Lewis acid, or metal chelate, until a viscosity of about 0.5 to about 10 cps is obtained. The diluted product is blended with a photoinitiator, coated onto a substrate, dried and irradiated to obtain oxygen barrier films having a very low oxygen transmission rate.

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