Aluminum phosphorus acid salts as epoxy resin cure inhibitors

摘要

Certain aluminum salts of organic phosphorus acids are found to have a strong effect on inhibiting the epoxy cure rate in epoxy formulations. The substances act catalytically and can be used at a low level in an epoxy formulation to adjust the reactivity of a resin formulation to give longer gel times. Compositions and methods of preparing and using the compositions are disclosed.

主权项

1. A composition comprising
a) an epoxy resin, b) a cross linker comprising a phenolic cross linker and wherein the composition comprises from about 50 to about 150% of the stoichiometric amount of hydroxy groups needed to cure the epoxy resin, c) from 0.1 to 2 parts per hundred parts of epoxy resin of an aluminum phosphonate, phosphinate or phosphate salt cure inhibitor selected from compounds having the formula I: wherein X and Y are independently selected from C1-10 alkoxy, C1-10 alkyl, C6-10 aryl, C6-10 aryl substituted by one or more C1-10 alkyl, C6-10 aryloxy and C6-10 aryloxy substituted by one or more C1-10 alkyl, and d) a phosphorus containing flame retardant comprising from about 10 to 50 wt % of one or more compounds of formula (i) from about 30 to 60 wt % of one or more compounds of formula (ii) from about 10 to 50 wt % of one or more compounds of formula (iii)and
from 0 to about 10 wt % tri-phenyl phosphine oxide based on the combined weight of compounds of formula (i), (ii), (iii) and tri-phenyl phosphine oxide, wherein each R is independently hydrogen or an alkyl group containing from 1 to 6 carbon atoms, R1 and R2 are the same or different and each is an alkyl group containing from 1 to 6 carbon atoms, each of x and y is an integer from 0 through 4.