Binder for glass paper
A binder for glass fiber nonwoven comprising a polyvinyl alcohol, the polyvinyl alcohol having a shape with an aspect ratio of 1.9 to 30 and a degree of saponification of 99.0 mol % or more.
1. Polyvinyl alcohol particle or particles having a particle shape with an aspect ratio of 1.9 to 2.11 and having a degree of saponification of 99.0 mol % or more, wherein a ratio of particles with a particle diameter of 53 μm or less is 50% or less and a ratio of particles with a particle diameter of 180 μm or more is 8% or less, in a particle diameter distribution of the polyvinyl alcohol particles.
2. The polyvinyl alcohol particles according to claim 1 , wherein the polyvinyl alcohol particles have a degree of swelling of 2.5 to 5.0.
3. The polyvinyl alcohol particles according to claim 1 , wherein the polyvinyl alcohol particles have a cold water solubility of 10.0% or less.
4. The polyvinyl alcohol particles according to claim 1 , wherein the polyvinyl alcohol particles have a degree of swelling of 2.5 to 5.0 and a cold water solubility of 3.9% to 10.0%.