摘要:
In summary, the invention is related to the discovery of a class of compounds which inhibits the reaction of a polyepoxide with a curing agent at low temperatures. More particularly the invention relates to an epoxy resin composition comprisinga) a polyepoxide; andb) a cure inhibitor comprising boric acid.
摘要:
In summary, the invention is related to the discovery of a class of compounds which inhibits the reaction of a polyepoxide with a curing agent at low temperatures. More particularly the invention relates to an epoxy resin composition comprisinga) a polyepoxide; andb) a cure inhibitor comprising boric acid or maleic acid.In another embodiment, the invention comprises an epoxy resin composition comprisinga) a polyepoxide;b) a cure inhibitor comprising boric acid or maleic acid,c) a curing agent without phenolic hydroxyl moieties, andd) optionally a catalyst for the reaction of the polyepoxide with the curing agent.In still another embodiment the invention relates to a composition useful for curing a polyepoxide which comprisesa) a curing agent capable of reacting with a polyepoxide at elevated temperatures; andb) an inhibiting amount of boric acid or maleic acid; and optionallyc) a catalytic amount of a catalyst useful for accelerating the reaction of a polyepoxide with the curing agent.
摘要:
Phenol-aldehyde novolac resins having reduced quantities of 2-functional material are prepared by removing all or part of the 2-functional material from this product resulting from reacting phenol with an aldehyde. Epoxy novolac resins prepared from the novolac resin containing less 2-functional product exhibit increased Tg values when cured.
摘要:
Latent catalysts for epoxy reactions are prepared by reacting a tetrasubstituted onium compound such as tetrabutylphosphonium acetate acetic acid complex with an acid or metal salt of an acid having a weak-nucleophilic anion such as fluoboric acid. These catalysts provide stable latent catalysts for epoxy resins for advancement or curing reactions.
摘要:
Phenol-aldehyde novolac resins having reduced quantities of 2-functional material are prepared by removing all or part of the 2-functional material from this product resulting from reacting phenol with an aldehyde. Epoxy novolac resins prepared from the novolac resin containing less 2-functional product exhibit increased Tg values when cured.
摘要:
New epoxy resins are prepared by reacting a hydroxybenzamide or derivative thereof with an epihalohydrin followed by dehydrohalogenation. These epoxy resins have crystalline melting points, self-cure at elevated temperatures and cure rapidly in the presence of the usual epoxy resin curing agents. Also disclosed are hydrolyzed products of these epoxy resins and subsequent reactions with polyisocyanates.
摘要:
Resin compositions are prepared by reacting an epoxy resin with an amine-substituted aromatic sulfonic acid amide at a temperature up to about 130.degree. C. The resultant product can be cured by heating to a temperature of at least about 150.degree. C. in the presence of suitable curing agents and in some instances in the absence of any curing agent.
摘要:
The epihalohydrin yield in a process for preparing low molecular weight epoxy resins by coupling a polyhydric phenol and an epihalohydrin in the presence of an alkali metal hydroxide and subsequent dehydrohalogenation is improved by employing stoichiometric quantities of the alkali metal hydroxide with respect to the polyhydric phenol in the coupling reaction and also conducting the coupling reaction in the presence of a halohydrin that is at least as reactive as the halohydrin being formed.
摘要:
Certain tetrahydrocarbyl phosphonium phenoxide salts are described herein which are novel compounds and/or novel catalysts for promoting the reaction between vicinal epoxides and phenols and/or carboxylic acids or anhydrides. These catalysts are particularly useful in preparing high molecular weight epoxy resins by the advancement reaction of diglycidyl ether of bisphenol A with bisphenol A.