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Process for preparing polycarbamate and reaction product thereof
US2016194447A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016194447-A1 |
| Application number | US-201414908795-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jul 28, 2014 |
| Priority date | Jul 31, 2013 |
| Publication date | Jul 7, 2016 |
| Grant date | — |
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Abstract
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A first process to produce polycarbamate comprising providing urea in liquid form; and adding the liquid urea to a polyol is provided. A second process for producing polycarbamate comprising adding solid urea to a polyol in liquid form to form a reaction mixture is provided. Also provided is a reaction product produced by the first process or second process.
First claim
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We claim: 1 . A first process to produce polycarbamate comprising: providing urea in liquid form; and adding the liquid urea to a polyol. 2 . The first process according to claim 1 , wherein the adding the liquid urea to the polyol is conducted in a semi-batch manner. 3 . The first process according to claim 1 , wherein the urea in liquid form is in solution, a melt or a clathrate. 4 . The first process according to claim 1 , wherein the adding the liquid urea to the polyol is conducted in the presence of a catalyst. 5 . The first process according to claim 2 , wherein the liquid urea is added to the polyol at a constant, pulsed, or variable rate of addition. 6 . The first process according to claim 1 , wherein the urea in liquid form is urea dissolved in a first solvent. 7 . The first process according to claim 6 , wherein the first solvent is water. 8 . The first process according to claim 6 , wherein the polyol is dissolved in a second solvent prior to the step of adding the urea in liquid form to the polyol. 9 . The first process according to claim 8 wherein the first and second solvents form a heterogeneous azeotrope allowing removal of the first solvent and the second solvent being returned to the reactor. 10 . The first process according to claim 9 wherein the removal of the first solvent is by decantation. 11 . A second process for producing polycarbamate comprising: adding solid urea to a polyol in liquid form to form a reaction mixture. 12 . The second process according to claim 11 , wherein the temperature of the reaction mixture is above the melting point of urea. 13 . The second process according to claim 11 , wherein the adding the solid urea to the polyol is conducted in a semi-batch manner. 14 . The second process according to claim 12 , wherein the adding the solid urea to the polyol in liquid form is conducted in the presence of a catalyst. 15 . The second process according to claim 11 , wherein the solid urea is added to the polyol in liquid form at a constant, pulsed, or variable rate of addition. 16 . A reaction product produced by the first process according to claim 1 . 17 . A reaction product produced by the second process according to claim 11 .
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- C08G71/04Primary
Polyurethanes · CPC title
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- What does patent US2016194447A1 cover?
- A first process to produce polycarbamate comprising providing urea in liquid form; and adding the liquid urea to a polyol is provided. A second process for producing polycarbamate comprising adding solid urea to a polyol in liquid form to form a reaction mixture is provided. Also provided is a reaction product produced by the first process or second process.
- Who is the assignee on this patent?
- Dow Global Technologies Llc
- 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 Thu Jul 07 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). 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).