Highly miscible polymer blends and uses thereof

摘要

Compositions comprise a highly miscible polymer blend of at least one cellulose derivative and at least one polysiloxane additive of formula [R1R2R3SiO0.5]a[R4R5SiO]b[R6SiO1.5]c[SiO2]d, wherein the substituents R1, R2, R3, R4, R5 and R6 each independently represents a hydrocarbon group or a functional group selected from a hydroxyl group, an acyloxy group or an alkoxy group, and may be the same or different from each other with respect to each individual silicon atom, and 0≦a≦0.4, 0.01≦b≦0.99, 0.01≦c≦0.99, 0≦d≦0.3, under the proviso that at least one hydrocarbon group and at least one functional group are present and a+b+c+d=1. Articles such as optical films comprising such a composition exhibit improved moisture barrier properties, reduced and adjustable out of plane retardation, adjustable glass transition temperature and provide for a facile generation of hydrophilic surface properties without considerable difference of the mechanical properties compared to corresponding articles of the pure cellulose derivative. A method to prepare such optical films, which can be particularly useful as retardation or protection films for polarizing plates in liquid crystal display devices, is also provided.

主权项

1. A composition comprising a miscible blend of:
A) at least one cellulose derivative, and B) at least one polysiloxane of the formula
[R1R2R3SiO0.5]a [R4R5SiO]b [R6SiO1.5]c [SiO2]d wherein the substituents R1, R2, R3, R4, R5 and R6 each independently represent a hydrocarbon group or a functional group selected from the group consisting of hydroxyl groups, acyloxy groups or alkoxy groups, and may be the same or different from each other with respect to each individual silicon atom, and
0≦a≦0.4, 0.01≦b≦0.99, 0.01≦c≦0.99, 0≦d≦0.3,under the proviso that at least one hydrocarbon group and at least one functional group are present and a+b+c+d=1.