Special Grades
KURARAY K-POLYMER
  1. Grades and their Specification of KURARAY K-polymer


    		 Grade Items
    Items KL-318 KL-506 KM-118 KM-618
    Volatiles (% max) 5.0 5.0 5.0 5.0
    Ash Content (% max) 1.5 1.5 1.5 1.0
    Viscosity (cps)* 20 - 30 5.2 - 6.2 26 - 34 26 - 34
    Hydrolysis (mol %) 85 - 90 74 - 80 95.5 - 98.5 92.5 - 95.5
    *Viscosity of 4% aqueous solution at 20

  2. Properties

    1. At the same degree of hydrolysis, the carboxylated polymer (KURARAY K-polymer) has stronger hydrophilic property than conventional PVA, namely the K-polymer dissolves in water more easily.

    2. Even if the degree of hydrolysis is low, K-polymer dissolves in water very well. Therefore, K-polymer, for example KL-506, has a good affinity, as well as the good water solubility, to hydrophobic substances such as polyester, polystyrene etc.

    3. K-polymer has a good hygroscopic efficiency at the standard condition (20, 65% RH) or under higher humidity so that its film is soft and flexible.

    4. K-polymer can react with Aluminum Sulfate Al2(SO4)3 to form the gel. This property will make K-polymer work effectively in the paper sizing.

    5. K-polymer is stable for the salting out effect compared with the conventional PVA, which has the same degree of hydrolysis.

    6. The dissolving method is same as conventional PVA.


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