Examples of 'cyclic urea' in a sentence
Meaning of "cyclic urea"
cyclic urea - Cyclic urea refers to a group of chemical compounds that contain a urea molecule within a cyclic or ring structure
How to use "cyclic urea" in a sentence
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cyclic urea
Reaction product of a cyclic urea and a multifunctional aldehyde.
Another aspect of the invention is to propose new cyclic urea compounds.
Processes of making cyclic urea prepolymers are recognized in the art.
Another reactant of interest is sodium sulfamate to make the cyclic urea sulfonate.
The cyclic urea prepolymer is then used as a modifier of the resin.
In this process, chromatographic separation of the unsubstituted and monosubstituted cyclic urea is required.
The cyclic urea prepolymer may be prepared by any suitable method.
The catalyzed gel time increased with increasing % cyclic urea prepolymer extension.
The cyclic urea derivative absorbs acetaldehyde produced by the oxidation of ethanol.
Preferably the mole ratio of reactants for the cyclic urea prepolymer are as follows,.
The cyclic urea prepolymer may also be used as a crosslinker in novolac resins.
Higher temperatures accelerate the conversion of the non-cyclic urea groups into cyclic urea groups.
Cyclic urea prepolymers are more readily available than the melamine crystal.
Examples A-D herein illustrate how to make preferred novel cyclic urea compounds described herein.
The amount of cyclic urea prepolymer added to the resin is dependent on the application.
See also
Phenol is combined with formaldehyde, water, cyclic urea prepolymer, and caustic.
The cyclic urea prepolymer can be cooked into the base resin or post added.
Scheme 7 outlines a method for preparing cyclic urea ( imidazolidinone ) compounds of this disclosure.
Cyclic urea compounds according to claim 1 wherein A is selected from.
Fixapret NF, a cyclic urea available from BASF.
A method according to claim 1 wherein the isocyanate-reactive cyclic compound is a cyclic urea of formula,.
When blending the cyclic urea prepolymer into a binder system, several modifier levels are possible.
Examples 12 and 13 also demonstrate the effectiveness of using the dialdehyde or cyclic urea with starch.
Paper Saturating Resin Cyclic urea prepolymer can also be added to saturating type phenol-formaldehyde resins.
The amino acid intermediate ( 5a ) may then be cyclized to form the cyclic urea intermediate ( 5b ).
The cyclic urea moiety may be a 6-membered ring.
Fixapret, an isocyanate-reactive cyclic urea available from BASF.
The cyclic urea prepolymers contain at least 20 % triazone and substituted triazone compounds.
Deprotection and cyclization of 14g with CDI provides the cyclic urea 14h.
The cyclic urea prepolymer acts as a plasricizer " softening " the cure of the phenol-formaldehyde resin.
Part B, Compound ( IVA ) The solution of cyclic urea ( IIIA ) was deprotected in situ.
The cyclic urea moiety has the following structure, wherein R5 is a C1 alkylene.
The boards made with 20 % cyclic urea were not durable and exhibited lower IB values.
The cyclic urea prepolymer comprised 9.5 wt % of the final resin.
Fixapret NF being a cyclic urea available from BASF ; perfluoropentane available from 3M ;.
A cyclic urea of Formula X is contacted with an equimolar quantity of dimethylsulfate, ( CH ₃ ) ₂ SO ₄.
The cyclic urea moiety is a 5-membered ring.
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