Quality degradation with flipbook

Greetings colleagues! Faced with such a problem: Loading textures into the engine, convert to sprites - I get good quality. Then I create a sprite animation using flipbook and the quality is getting worse(removed anti-aliasing on the edges). I have always worked with three-dimensional graphics and I can not understand what is the reason.
Can you help or give a link to read solution(myself I still can not find)?
Attached images for example.
Best regards, your friend, Alex.

Problem was solved.

It’s strange. Ok, no problem, https://drive.google.com/open?id=0B4cOZbFbHJglMUpuVU5vUkNDSm8
download it, unzip in content folder. After that you need use TranslucentUnlitSpriteMaterial
Or u can find it in engine folder, paper2d plugin of course.

What was the solution?

You need to change material for flipbook, for example u can to use shader for 2d sprite.

No problem, you need to set translucent(unlit for example) material for flipbook animation, u can find all materials in paper2d folder in engine. I attach this material for you.
https://drive.google.com/open?id=0B4cOZbFbHJglODdENnU4aUJHVWs