Urethane resins
Urethane resins are formed by the condensation reaction of a urethane (carbamate) with an aldehyde. The reaction conditions determine whether a distinct compound or a resin is formed.
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Melamine Resins
Melamine reacts with formaldehyde at pH 9–10 to form hexahydroxymethylmelamine. One mole of melamine combines with 6 moles of formaldehyde to produce hexahydroxymethylmelamine.
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Urea-Formaldehyde Resins
All urea–formaldehyde condensates containing the recurring unit urea-methyl, from monomolecular to high molecular products. During the 1970s, multiple revelations emerged regarding the composition of urea–formaldehyde resins.
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Uses of Amino Resins
Amino resins are a versatile class of materials with a wide range of applications. They are typically formed by the reaction of an amine with a formaldehyde, and can be further modified with a variety of other additives.
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Production of Amino Resins
Amino resin production is a two-step process: hydroxymethylation and condensation. Hydroxymethylation is the addition of formaldehyde to an amino compound, such as urea, to form a hydroxymethyl derivative. Condensation is the reaction of two hydroxymethyl derivatives to form a larger molecule.
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Amino resins are condensation polymers formed by the reaction of carbonyl compounds with compounds containing amino, imino, or amide groups. The reaction releases water, and the resulting products are oligomers, also known as prepolymers.
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Benzonitrile: Properties, Production and Uses
Benzonitrile is an organic compound with the formula C7H5N, abbreviated PhCN. It is a colorless liquid with a sweet bitter almond odor. It is mainly used as a precursor to the resin benzoguanamine.
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Aluminate: Production and Uses
Aluminates are metal salts of alumina (aluminum oxide, Al2O3). The most important aluminates in industry are sodium aluminate and barium aluminate.
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Aluminum Chloride: Properties, Production and Uses
Hans Christian Oersted first prepared anhydrous aluminum chloride in 1825 by passing chlorine gas through a heated mixture of alumina and carbon. This compound is a significant catalyst in organic chemistry, particularly for Friedel-Crafts alkylation and acylation, which are used to produce alkylated aromatics, dyestuffs, pharmaceuticals, and perfumery chemicals.
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Alums: Properties, Production and Uses
Alum, recognized as a double salt of potassium and aluminum sulfates, was known among the ancient Greeks and Romans as both an astringent and a mordant for wool dyeing. It found diverse application, extending to skin processing, preservation of both animal and human remains, and for fireproofing wood.
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Calone 1951: Properties, Production and Uses
Calone 1951 or watermelon ketone is a synthetic organic compound with the formula C11H12O2. It is a white powder with a fresh, marine odor. Watermelon ketone is used in the fragrance industry to create fresh aquatic marine notes.
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Aluminum Sulfate: Properties, Production and Uses
Aluminum sulfate is a white, odorless, crystalline solid. It is a chemical compound with the formula Al2(SO4)3. It is soluble in water and forms a clear solution. Aluminum sulfate is a common industrial chemical and is used for a variety of purposes.
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