Improvements relating to the production of glass fibre laminates

A keying agent for use in a glass fibrepolyester resin laminate is an aluminium compound of the type AlXY2 or AlX2Y, where X is chlorine, bromine, or an alkoxy group, e.g. iso-propoxy or sec.-butoxy, and Y is an organic group containing one or more polymerizable double bonds, e.g. ROOC.CH : CH.COO-(where R is an alkyl group) or CH3.CH : CH.COO-. The glass fibre may be in the form of a woven fabric or of a mat or fleece. In the examples, heat-cleaned glass cloth is dipped in solutions in toluene or isopropanol of the aluminium compounds, removed, air dried, washed with water and oven dried.ALSO:According to the Provisional Specification, a keying agent which is an aluminium compound of the type AlXY2 or AlX2Y, where X is chlorine, bromine or an alkoxy group, e.g. iso-propoxy or sec.-butoxy, and Y is an organic group containing one or more polymerizable double bonds, e.g. ROOC.CH:CH.COO- (where R is an alkyl group), or CH3.CH:CH.COO- is used in admixture with an unsaturated polyester resin in the production of fibreglass-polyester resin laminates.ALSO:A keying agent for use in a glass fibre-polyester resin laminate is an aluminium compound of the type AlXY2 or AlX2Y, where X is chlorine, bromine or an alkoxy group, e.g. isopropoxy or sec.-butoxy, and Y is an organic group containing one or more polymerizable double bonds, e.g. ROOC.CH:CH.COO-(where R is an alkyl group) or CH3.CH: CH.COO-. In the examples: (1) a hot solution of maleic anhydride in toluene was added to aluminium tri-iso-propoxide in toluene, the product was a solution of aluminium mono-iso-propoxide di-(mono-isopropyl maleate); (2) maleic anhydride and aluminium monochloride di-iso-propoxide were dissolved separately in toluene, the first solution was heated and the second added quickly while stirring, the mixture was heated under reflux for one hour and the solvent then distilled off, the product was aluminium mono chloride di-(mono-iso-propyl maleate).