Protective film and encapsulation material comprising the same

摘要

Disclosed herein is a protective film. The protective film is produced by alternate coating of a polysilazane-based polymer and a flexible polysiloxane-based polymer. The polysilazane-based polymer is cured at low temperature to form silica, thereby achieving high hardness and high light transmittance. The protective film has improved interfacial adhesion between the respective coating films, which prevents permeation of moisture and oxygen. In addition, the protective film can be easily produced by low-temperature wet processes. Also disclosed herein is an encapsulation material comprising the protective film.

主权项

1. A protective film comprising one or more pairs of a first coating film and a second coating film,
wherein the first coating film contains a polysilazane-based polymer and the second coating film contains a polysiloxane-based polymer comprising a C2 to C10 alkylene group in a backbone thereof, wherein the first and second coating films form alternating layers in the protective film, wherein the polysilazane-based polymer is represented by Formula 1:
—(SiH2—NH)n—  (1)wherein n is a number from 500 to 1,000,000,
wherein the polysiloxane-based polymer is prepared by hydrolysis and polycondensation of at least one compound represented by Formula 6:wherein R is C1-C3 alkyl group, X1, X2 and X3 are each independently a C1-C10 alkoxy group, n is an integer from 3 to 8 and m is an integer from 1 to 10, and
at least one compound represented by Formula 7:
RSiX1X2X3  (7)wherein R is C1-C3 alkyl group, and X1, X2 and X3 are each independently a C1-C10 alkoxy group, and
wherein the second coating film further comprises a multi-functional cyclic siloxane compound represented by Formulas 10 or 13,