Adhesive polyolefin composition

A laminate comprising a first layer of aluminum and a second layer bonded to said first layer, said second layer being formed of a composition comprising:

• a polyolefin;
• an acetylenic diperoxy crosslinking agent;
• from about 2 percent to about 7.5 percent by weight based on the weight of said polyolefin of ammonium polyphosphate having at least 45 percent of phosphate in the form of polyphosphates;
• from about 5 percent to about 20 percent by weight based on the weight of said polyolefin of a dimer of hexachlorocyclopentadiene;
• and
• from about 2 percent to about 7.5 percent by weight based on the weight of said polyolefin of a halogenated phosphorus-nitrogen compound represented by the formula ##EQU7## where R' is selected from the group consisting of hydrogen and alkyl radicals having 1 to 3 carbon atoms, R is a cyano alkyl radical having 2 to 6 carbon atoms, and X is chlorine, bromine, or iodine.

The process of bonding a suitable first surface to a suitable second surface, said process comprising combining a polyolefin, an acetylenic diperoxy crosslinking agent, ammonium polyphosphate having at least 45 percent of phosphate in the form of polyphosphates, dimer of hexachlorocyclopentadiene, and a halogenated phosphorus-nitrogen compound represented by the formula ##EQU8## where R' is selected from the group consisting of hydrogen and alkyl radicals having 1 to 3 carbon atoms, R is a cyano alkyl radical having 2 to 6 carbon atoms, and X is chlorine, bromine, or iodine;

• depositing the thus-prepared polyolefin composition between said suitable first surface to which it is capable of adhering and said suitable second surface to which it is capable of adhering;
• heating said polyolefin composition, said first surface, and said second surface to a temperature above the melting point of said polyolefin composition;
• maintaining said polyolefin composition, said first surface, and said second surface at said temperature for a period of time sufficient to permit a crosslinking reaction to take place;
• and cooling said polyolefin, said first surface, and said second surface.

A process of bonding a polyolefin to a surface of a suitable material, said process comprising combining with polyolefin, an acetylenic diperoxy crosslinking agent, ammonium polyphosphate having at least 45 percent of phosphate in the form of polyphosphates, dimer of hexachlorocyclopentadiene, and a halogenated phosphorus-nitrogen compound represented by the formula ##EQU9## where R' is selected from the group consisting of hydrogen and alkyl radicals having 1 to 3 carbon atoms, R is a cyano alkyl radical having 2 to 6 carbon atoms, and X is chlorine, bromine, or iodine;

• mixing the combined ingredients to form a substantially uniform composition;
• contacting the thus-prepared polyolefin compostion and said surface with the temperature of said polyolefin composition being above the melting point of said polyolefin composition;
• maintaining said polyolefin composition and said surface above said melting point for a period of time sufficient to permit a crosslinking reaction to take place;
• and then cooling said polyolefin composition below said melting point.

A process of bonding a polyolefin to an aluminum surface, said process comprising:

• combining with said polyolefin an acetylenic diperoxy crosslinking agent, from about 2 percent to about 7.5 percent by weight based on
• the weight of said polyolefin of ammonium polyphosphate having at
• least 45 percent of phosphate in the form of polyphosphates, from about 5 percent to about 20 percent by weight based on
• the weight of said polyolefin of a dimer of hexachlorocyclopentadiene, and from about 2 percent to about 7.5 percent by weight based on
• the weight of said polyolefin of a halogenated phosphorus-nitrogen compound represented by the formula ##EQU13## where R' is selected from the group consisting of hydrogen and alkyl radicals having 1 to 3 carbon atoms, R is a cyano alkyl radical having 2 to 6 carbon atoms, and X is chlorine, bromine, or iodine;
• mixing the combined ingredients to form a substantially uniform composition;
• contacting the thus-prepared polyolefin composition and said aluminum surface with the temperature of said polyolefin composition being above the melting point of said polyolefin composition;
• maintaining said polyolefin composition and said aluminum surface above said melting point for a period of time sufficient to permit a crosslinking reaction to take place;
• and
• subsequently cooling said polyolefin composition below said melting point.

A process of bonding a first suitable surface to a second suitable surface, said process comprising:

• combining
• a polyolefin;
• an acetylenic diperoxy crosslinking agent;
• from about 2 percent to about 7.5 percent by weight based on the weight of said polyolefin of ammonium polyphosphate having at least 45 percent of phosphate in the form of polyphosphates;
• from about 5 percent to about 20 percent by weight based on the weight of said polyolefin of a dimer of hexachlorocyclopentadiene;
• and
• from about 2 percent to about 7.5 percent by weight based on the weight of said polyolefin of a halogenated phosphorus-nitrogen compound represented by the formula ##EQU17## where R' is selected from the group consisting of hydrogen and alkyl radicals having 1 to 3 carbon atoms, R is a cyano alkyl radical having 2 to 6 carbon atoms, and X is chlorine, bromine or iodine;
• depositing the thus-prepared polyolefin composition between a first surface to which it is capable of adhering and a second surface to which it is capable of adhering;
• heating said polyolefin composition, said first surface, and said second surface to a temperature above the melting point of said polyolefin composition;
• maintaining said polyolefin composition, said first surface, and said second surface above said melting point for a period of time sufficient to permit crosslinking reaction to take place;
• and
• cooling said polyolefin, said first surface, and said second surface below said melting point.