Method for preparing polyisocyanate composition
AssigneeHanwha Solutions Corporation
InventorsYujin SIM, Juyoung PARK, Byeong Hyeon LEE, Sanghyun CHO
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Abstract
There is provided a method for preparing a polyisocyanate composition capable of improving transparency of a product, by mixing a phenol-based stabilizer in an amount of 1 to 1000 ppmw, based on the total weight of aromatic diisocynate, and then, introducing polyhydric alcohol to conduct a polymerization reaction, thereby inhibiting coloration and whitening due to oxygen or moisture during synthesis and purification processes.
Claims16
A method for preparing a polyisocyanate composition comprising the steps of:
- mixing aromatic diisocyanate and a phenol-based stabilizer to prepare a monomer composition;
- and
- adding polyhydric alcohol having two or more hydroxyl groups in the molecule to the monomer composition and conducting a polymerization reaction,
- wherein the phenol-based stabilizer is used in an amount of 10 to 1000 ppmw, based on the total weight of the aromatic diisocyanate.
A polyisocyanate composition comprising polyisocyanate formed by the polymerization reaction of aromatic diisocyanate and polyhydric alcohol, and a phenol-based stabilizer,
- wherein the content of isocyanate groups is 10 to 20 wt %, based on the total weight of the composition having a solid content of 75 wt %,
- the content of unreacted aromatic diisocyanate is 1 wt % or less, based on the total weight of a solid content in the composition, and
- chromaticity measured according to APHA method is 30 or less.
Dependencies are inferred from the claim text.