US 12,503,427 B2Granted

Diamine composition, and method of preparing diisocyanate composition

AssigneesSK Pucore Co., Ltd., Woori Fine Chem Co., Ltd.

InventorsJaeyoung Pai, Jeongmoo Kim, Hyuk Hee Han, Jung Hwan Myung, Jooyoung Jung, Myung-Ok Kyun

Life of this patent

Estimating the term…

Loading patent…

Abstract

The diamine composition according to an embodiment of the present invention comprises a benzylmonoamine having a methyl group in an amount of 10 ppm to 2,000 ppm in the composition. When it is used for the preparation of a diisocyanate composition and an optical material, it is possible to improve the optical characteristics by preventing the occurrence of yellowing, striae, and cloudiness in the optical material and enhancing the mechanical properties such as impact resistance at the same time. Thus, the diisocyanate composition can be applied to the preparation of a plastic optical lens of high quality.

Claims4

Dependent claims

A process for preparing a diisocyanate composition, which comprises:

reacting a diamine composition with an aqueous hydrochloric acid solution to obtain a diamine hydrochloride composition;
and
obtaining a diisocyanate composition using the diamine hydrochloride composition and triphosgene,
wherein the diamine composition has a b* value according to the CIE color coordinate of 0.01 to 3.0,
wherein the diamine hydrochloride composition has a b* value according to the CIE color coordinate of 1.2 or less when dissolved in water at a concentration of 8% by weight, and
wherein the diisocyanate composition has a b* value of 0.01 to 2.0 according to the CIE color coordinate, and
wherein a content of Fe ions in the aqueous hydrochloric acid solution is 0.001 ppm to 0.5 ppm.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/353,107Filed 17 Jul 2023 · division
Priority: KR 10-2019-01614506 Dec 2019
Published: US 2023/0357136 A19 Nov 2023
Granted: 23 Dec 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

C07C 263/20
Separation; Purification; Stabilisation; Use of additives: separation; Purification
C07C 211/27
Of an unsaturated carbon skeleton containing at least one six-membered aromatic ring: having amino groups linked to the six-membered aromatic ring…
C07C 263/10
Preparation of derivatives of isocyanic acid: by reaction of amines with carbonyl halides, e.g. with phosgene
C07C 265/14
Derivatives of isocyanic acid: containing at least two isocyanate groups bound to the same carbon skeleton

Family

Application17/111,779Parent of this division · filed 4 Dec 2020
US 11,760,719 B2Parent of this division · filed 19 Sep 2023
US 2023/0357136 A1Pre-grant publication · published 9 Nov 2023
US 2021/0171447 A1Published application
US 12,503,427 B2This patent

From the US filing history. Foreign family members aren’t listed.