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Method for producing light-coloured TDI-polyisocyanates
US10189945B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10189945-B2 |
| Application number | US-201414774297-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 7, 2014 |
| Priority date | Mar 12, 2013 |
| Publication date | Jan 29, 2019 |
| Grant date | Jan 29, 2019 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
The invention relates to polyisocyanates comprising urethane groups, based on toluylene diisocyanate, to a method for their production, and to their use as the polyisocyanate component in one- and two-component polyurethane coatings.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing polyisocyanates comprising urethane groups and having APHA colour indices <50 Hazen comprising reacting di- to tetra-valent organic polyhydroxy compounds with excess amounts of toluylene diisocyanate and then removing unreacted excess toluylene diisocyanate to residual contents <0.5 wt. % by distillation, wherein the toluylene diisocyanate has a content of 2-chloro-6-isocyanato-methylcyclohexadienes <5 wt·ppm. 2. The method according to claim 1 , wherein the toluylene diisocyanate is produced by gas phase phosgenation. 3. The method according to claim 1 , wherein the toluylene diisocyanate has a content of 2-chloro-6-isocyanato-methylcyclohexadienes below the detection limit of 1 wt·ppm. 4. The method according to claim 1 , wherein the polyisocyanates comprising urethane groups have APHA colour indices <30 Hazen. 5. The method according to claim 1 , wherein the toluylene diisocyanate is 2,4-toluylene diisocyanate or a mixture thereof with up to 35 wt. %, based on the mixture, of 2,6-toluylene diisocyanate. 6. The method according to claim 1 , wherein the polyhydroxy compounds are di- to tetra-hydric alcohols having a molecular weight of from 62 to 146 and/or polyether polyols having a molecular weight in the range of from 106 to 600 prepared therefrom by addition of ethylene oxide and/or propylene oxide. 7. The method according to claim 1 , wherein the polyhydroxy compounds are a mixture of trimethylolpropane and diethylene glycol. 8. A polyisocyanate comprising urethane groups produced by the method according to claim 1 . 9. A method comprising utilizing the polyisocyanates comprising urethane groups according to claim 8 as the polyisocyanate component in a polyurethane coating. 10. The method according to claim 9 wherein the polyisocyanates comprising urethane groups is a crosslinker in two-component polyurethane coatings. 11. A polyurethane adhesives comprising the polyisocyanate produced by the method according to claim 8 .
Assignees
Inventors
Classifications
Polyurethanes · CPC title
Polyurethanes · CPC title
Polycondensates having carboxylic or carbonic ester groups in the main chain · CPC title
- C08G71/04Primary
Polyurethanes · CPC title
being toluene diisocyanate including isomer mixtures · CPC title
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Frequently asked questions
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- What does patent US10189945B2 cover?
- The invention relates to polyisocyanates comprising urethane groups, based on toluylene diisocyanate, to a method for their production, and to their use as the polyisocyanate component in one- and two-component polyurethane coatings.
- Who is the assignee on this patent?
- Covestro Deutschland Ag
- What technology area does this patent fall under?
- Primary CPC classification C08G71/04. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jan 29 2019 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).