Flame-retardant olefinic resin compositions

A flame-retardant olefinic resin composition comprising the product of reacting component ( 1) with component (2) essentially in the absence of both of the following:

• a free-radical generator and a catalytic accelerator;
• wherein components (1) and (2) are as follows:
• (1) 100 parts by weight of an ethylenic polymer resin mixture having an average density of 0.890 to 0.915 g/cm.sup.3, of:
• (a) an ethylenic polymer consisting mainly of an ethylene-alpha-olefin copolymer, and
• (b) at least 2% based on the total weight of (a) and (b) of a silane-grafted polymer obtained by grafting a silane to at least one component of said ethylenic polymer (a), and
• (2) 50 to 300 parts by weight of a hydrated metal compound whereby hydrolytic condensation occurs between said hydrated metal compound and said silane grafted polymer to form siloxane linkages between the metal of said hydrated metal compound and silanol groups of said silane-grafted polymer.