Method for the continuous production of stable prepolymers
US-2017152342-A1 · Jun 1, 2017 · US
Bulk material comprising solid diisocyanates and prepolymers containing urethane groups obtainable therefrom
US11795260B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11795260-B2 |
| Application number | US-202017101250-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 23, 2020 |
| Priority date | Nov 28, 2019 |
| Publication date | Oct 24, 2023 |
| Grant date | Oct 24, 2023 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
The present invention relates to a bulk material comprising solid diisocyanate, especially naphthalene 1,5-diisocyanate or p-phenylene diisocyanate, to a process for production thereof, and to a process for preparing isocyanate prepolymers using the bulk material of the invention, to the isocyanate prepolymers themselves and to the use thereof for preparation of polyurethane elastomers, especially cast polyurethane elastomers.
First claim
Opening claim text (preview).
What is claimed is: 1. A process for producing a bulk material, comprising a crystallization operation (i) and at least one step (ii) comprising classification, agglomeration, or comminution, wherein the bulk material comprises a solid diisocyanate, wherein the solid diisocyanate is a solid at room temperature (25° C.), wherein the solid diisocyanate has a melting point of ≥80° C., and wherein, in a sieve analysis of the bulk material with a twin-sieve arrangement having mesh sizes 0.1 mm and 4 mm, at least 90% by weight of the bulk material is obtained in a fraction between 0.1 mm and 4 mm. 2. The process according to claim 1 , wherein the crystallization operation (i) comprises crystallizing a melt of the solid diisocyanate on a cold surface and scraping off the solid diisocyanate after solidification. 3. The process according to claim 1 , wherein step (ii) comprises comminution of the solid diisocyanate performed in a comminution apparatus. 4. The process according to claim 1 , wherein oversize bulk material and undersize bulk material are at least partly separated by classification in a step (iii) from the bulk material obtained in step (ii) and wherein a portion of the oversize bulk material and/or a portion of the undersize bulk material is at least partly recycled into the process.
Assignees
Inventors
Classifications
- C08G18/10Primary
Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title
Caprolactone and/or substituted caprolactone · CPC title
- C08G18/7678Primary
containing condensed aromatic rings · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US11795260B2 cover?
- The present invention relates to a bulk material comprising solid diisocyanate, especially naphthalene 1,5-diisocyanate or p-phenylene diisocyanate, to a process for production thereof, and to a process for preparing isocyanate prepolymers using the bulk material of the invention, to the isocyanate prepolymers themselves and to the use thereof for preparation of polyurethane elastomers, especia…
- Who is the assignee on this patent?
- Covestro Intellectual Property Gmbh & Co Kg
- What technology area does this patent fall under?
- Primary CPC classification C08G18/10. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Oct 24 2023 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).