Method for preparing aliphatic isocyanate
US-2020102268-A1 · Apr 2, 2020 · US
Diisocyanate composition, preparation method thereof and optical material using same
US12049437B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12049437-B2 |
| Application number | US-202017111688-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 4, 2020 |
| Priority date | Dec 6, 2019 |
| Publication date | Jul 30, 2024 |
| Grant date | Jul 30, 2024 |
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Abstract
Official abstract text for this publication.
The diisocyanate composition according to an embodiment of the present invention comprises, in the composition, a benzyl isocyanate having a methyl group in an amount of 5 ppm to 200 ppm, an aromatic compound having a halogen group in an amount of 5 ppm to 1,000 ppm, a benzyl isocyanate having an ethyl group in an amount of 1 ppm to 1,000 ppm, or a combination thereof. It is possible to improve the optical characteristics by preventing the occurrence of yellowing, striae, and cloudiness and to enhance the mechanical properties such as impact resistance at the same time. Thus, it can be advantageously used to prepare an optical material of high quality.
First claim
Opening claim text (preview).
The invention claimed is: 1. A composition comprising m-xylene diisocyanate in an amount of 99.5% by weight to less than 100% by weight based on the total weight of the composition; and a compound of Formula I in an amount of 5 ppm to 200 ppm by weight based on the total weight of the composition, a compound of Formula II in an amount of 5 ppm to 1,000 ppm by weight based on the total weight of the composition, a compound of Formula III in an amount of 1 ppm to 1,000 ppm by weight based on the total weight of the composition, or a combination thereof 2. The composition of claim 1 , further comprising p-xylylene diisocyanate in an amount of greater than 0% by weight to 0.5% by weight based on the total weight of the composition. 3. The composition of claim 1 , further comprising a thiol or an episulfide. 4. An optical material comprising a cured product of a composition, the composition comprises m-xylene diisocyanate in an amount of 99.5% by weight to less than 100% by weight based on the total weight of the composition; and a compound of Formula I in an amount of 5 ppm to 200 ppm by weight based on the total weight of the composition, a compound of Formula II in an amount of 5 ppm to 1,000 ppm by weight based on the total weight of the composition, a compound of Formula III in an amount of 1 ppm to 1,000 ppm by weight based on the total weight of the composition, or a combination thereof 5. The optical material of claim 4 , wherein the composition further comprises a thiol or an episulfide. 6. The optical material of claim 4 , which has an impact resistance energy (E) of 0.4 J to 4.0 J, a transmittance of 90% or more, and a yellow index of 22 or less.
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Classifications
Lenses · CPC title
Separation; Purification · CPC title
Recycling of unreacted starting or intermediate materials · CPC title
containing mercapto groups · CPC title
tin salts of carboxylic acids · CPC title
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- What does patent US12049437B2 cover?
- The diisocyanate composition according to an embodiment of the present invention comprises, in the composition, a benzyl isocyanate having a methyl group in an amount of 5 ppm to 200 ppm, an aromatic compound having a halogen group in an amount of 5 ppm to 1,000 ppm, a benzyl isocyanate having an ethyl group in an amount of 1 ppm to 1,000 ppm, or a combination thereof. It is possible to improve…
- Who is the assignee on this patent?
- Skc Co Ltd, Woori Fine Chem Co Ltd, Sk Pucore Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C07C265/08. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 30 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).