Acid curing

The cycloahphatic products are generally Hquids of lower viscosity than the standard glycidyl ether resins. The peroxidized resins contain no chlorine and low ash content and their ring-contained oxirane group (cyclohexene oxide type) reacts more readily with acidic curing agents than the bisphenol A-derived epoxy resins. [Pg.364]

In some instances it is desired to produce a more open network from epoxide resins that have been acid-cured. This may be achieved by the oligoesterdi-carboxylic acids of general structure... [Pg.760]

Acid Curing. Urea-formaldehyde resins and resol-phenol-formaldehyde resins can be acid-cured by wastes from the production of maleic anhydride [1902]. The waste from the production of maleic anhydride contains up to 50% maleic anhydride, in addition to phthalic anhydride, citraconic anhydride, benzoic acid, o-tolulic acid, and phthalide. The plugging solution is prepared by mixing a urea-formaldehyde resin with a phenol-formaldehyde resin, adding the waste from production of maleic anhydride, and mixing thoroughly. [Pg.278]

An acidic-cure catalyst is added to the urea-formaldehyde resin before it is used as an adhesive. Ammonium chloride and ammonium sulfate are the most widely used catalysts for resins in the forest products industry. A variety of other chemicals can be used as a catalyst, including formic acid, boric acid, phosphoric acid, oxalic acid, and acid salts of hexamethylenetetramine. [Pg.762]

The application of the branching theories to acid curing was rather successful the discovery of the relative Importance of the transesterification following the epoxy-carboxyl addition initiated the theoretical treatment of branching. The prediction was that... [Pg.19]

Heptanoic acid Cured Lf Hept-trans-2-ene-l-6-diol, 3-iso-propyl, (6-e) Lf 0.01 ... [Pg.278]

Leucinopine Crown Gall Tumor Tiss Levulinic acid Cured Lf ... [Pg.279]

Malonic acid Cured Lf Megastigma-4-trans-7-diene-3(S)-9(S)-diol, 6(R) Lf " ... [Pg.279]

Pentadecanal, 6-10-14-trimethyl, trans-2-ethylidene LP 535 Pentadecanal Lf Pentadecanoic acid Cured Pentadeca-trans-3-trans-8-cis-l 2-14-tetraen-2-one, 5-iso-propyl-8-12-dimethyl Lf smoke ... [Pg.281]

Schafffing, O.G. (1976) Composition comprising epoxy resin, copolymer of butadiene and acrylic acid, curing agent... [Pg.329]

In 1937, Elvehjem and coworkers demonstrated that nicotinic acid cured canine "blacktongue." In the same year it was found to cure human pellagra, a terrible disease characterized by weakness, indigestion, and loss of appetite followed by dermatitis,... [Pg.769]

Equation (2.47) is quite similar to Eq. (2.44), which means that acidic curing of resols is possible and may be achieved at room temperature by a variety of strong organic and inorganic acids. [Pg.43]

However, the primary emission sources of these compounds in the museum environment are-besides acid-curing sealants and cleaning agents-without con-... [Pg.281]

The type of epoxy group and its location within the molecule influence reactivity. Some epoxy resin structures prefer to react with acid curing agents, and others with basic curing agents. Certain epoxy structures are extremely reactive with specific catalysts, and others are virtually inactive. Several types of epoxy resins are reactive with almost all classes of curing agents. [Pg.53]

Based on alkali-soluble methylolated kraft lignin which was precipitated by acidification and blended with an acid-curing phenolic resin. [Pg.50]

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