Molding compositions containing quaternary organophosphonium salts

A flame retardant molding composition, comprising:

• a) at least one resin containing epoxide functional groups;
• b) at least one crosslinking agent containing functional groups that are reactive with epoxide groups;
• c) a cyanurate functional compound;
• and
• d) a quaternary organophosphonium salt present in at least an amount sufficient to provide improved flame resistance to the composition after curing thereof compared to a similar composition that does not contain component (d), and wherein component (d) is present in at least an amount sufficient to catalytically effect crosslinking of components (a) and (b) when the molding composition is heated to a temperature of at least 135° C.

A molding composition, comprising:

• a) from about 20 percent to about 90 percent, based on the total weight of the composition, of an inorganic filler component;
• b) from about 1 percent to about 25 percent by weight, based on the total weight of the composition, of a resin containing epoxide functional groups;
• c) from about 1 percent to about 10 percent by weight, based on the total weight of the composition, of a crosslinking agent containing functional groups that are reactive with epoxide groups;
• d) from about 0.1 percent to about 1 percent by weight, based on the total weight of the composition, of a quaternary organophosphonium salt;
• and
• e) less than about 3 percent by weight, based on the total weight of the composition, of a cyanurate functional compound.

A molding composition, comprising:

• a) from about 20 percent to about 90 percent, based on the total weight of the composition, of an inorganic filler component;
• b) from about 1 percent to about 25 percent by weight, based on the total weight of the composition, of a multifunctional epoxy resin derived from phenol and having a degree of branching of at least three;
• c) from about 1 percent to about 10 percent by weight, based on the total weight of the composition, of a multifunctional phenolic hardener derived from phenol and having a degree of branching of at least three;
• and
• d) from about 0.1 percent to about 1 percent by weight, based on the total weight of the composition, of a quaternary organophosphonium salt.