GB875811A - Improvements in or relating to epoxide resins - Google Patents

Abstract

The invention comprises epoxide resins which are the polyglycidyl ethers of trisphenols of the general formula: <FORM:0875811/IV (a)/1> where R1 is H or CH3 and where R2, R3, R4, R5, R6 and R7 may be the same or different and are selected from H, alkyl and halogen. The resins are prepared by condensing a trisphenol of the above general formula with epichlorhydrin or dichlorohydrin in alkaline medium, preferably using at least 2 moles of epichlorhydrin or dichlorhydrin per mole of phenolic hydroxyl group. The resins are soluble in aromatic hydrocarbons, chlorinated hydrocarbons and aliphatic ketones. They can be cured with a polycarboxylic acid or anhydride, mono- or polyamine or dicyandiamide. In Examples (1) 1 mole of a trisphenol (obtained by the reaction of 1 mole of chloracetone with 3 moles of phenol in the presence of hydrochloric acid) is reacted with 12 moles of epichlorhydrin in the presence of 3 moles of sodium hydroxide. The product is cured with p, p1-diaminodiphenylmethane. A fused mixture of resin and hardener remained fusible for 7 months when kept at room temperature; (2) a similar resin is mixed at 130 DEG C. with 4, 41-diaminodiphenyl sulphone and cast into rods for use as an adhesive; (5) 1, 1, 2-tris (hydroxyphenyl) ethane obtained by the reaction of 9 moles of phenol with 3 moles of 1, 2-dichloroethyl ether is reacted with epichlorhydrin in the presence of sodium hydroxide. The polyglycidyl ether obtained and 4, 41-diaminodiphenyl sulphone in methoxyethanol solution are used to impregnate 12 sheets of glass cloth which are placed in a heated press to form a laminate; (6) a polyglycidyl ether of the phenol obtained by reacting o-cresol and 1, 2-dichloroethyl ethyl ether is cured with p, p1-diaminodiphenylmethane; (7) a polyglycidyl ether of 1, 1, 2-tris (3, 5-dimethyl-4-hydroxyphenyl) ethane (from the reaction of 2, 6-xylenol and chloracetaldehyde) is cured with 4, 41-diaminodiphenylmethane. The Provisional Specification refers to polyglycidyl ethers of phenols of the formula: <FORM:0875811/IV (a)/2> where <FORM:0875811/IV (a)/3> is an aliphatic carbon chain and R3, R4, R5, R6, R7 and R8 may be H, alkyl, alkoxy or halogen. They are prepared by condensing the appropriate phenol or mixture of phenols, with chloroacetone, chloroacetaldehyde, methyl-1-chlorethyl ketone, chloromethyl ethyl ketone, 1, 2-dichloroethyl ether, methyl vinyl ketone or acrolein. Specification 774,663 is referred to. Reference has been directed by the Comptroller to Specification 798,177.