Foamable coupling for lamp assembly and methods for using the coupling
AssigneeTyco Electronics Corporation
InventorsAshok Mehan, Daniel A. Chandler, Erling Hansen, Rene J. Revueltas, Stephen P. Tordoff, Bryan P. Williams
Life of this patent
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Abstract
A foamable copolymer based coupling is provided for securely affixing a light emitting glass lamp in a metal base to form a lamp assembly. The copolymer is preferably selected from ethylene vinyl acetate, ethylene methyl acrylate, and combinations thereof. The foamable coupling may be placed around one end of the glass lamp or in the lamp base before the lamp and base are matingly engaged. The assembled lamp is then heated to a temperature, which causes the foamable coupling to expand and securely affix the lamp in the base.
Claims14
A lamp assembly comprising:
- a base having a top and side walls forming a cavity with an interior surface;
- a glass lamp having at least one end with an exterior surface inserted in the base cavity;
- and
- a foamable coupling positioned between the interior surface of the base and the exterior surface of the glass lamp, said coupling comprising a copolymer selected from the group consisting of ethylene vinyl acetate, ethylene methyl acrylate, ethylene butyl acrylate, ethylene ethyl acrylate, ethylene methacrylic acid, and mixtures thereof, a blowing agent, a chemical crosslinking agent and a radiation crosslinking promoter;
- wherein when the base and glass lamp are heated, the foamable coupling expands and securely affixes the glass lamp in the base.
A lamp assembly comprising:
- a base having a top and side walls forming a cavity with an interior surface;
- a glass lamp having at least one end with an exterior surface inserted in the base cavity;
- and
- a foamable coupling positioned between the interior surface of the base and the exterior surface of the glass lamp, said coupling comprising a non-pressure sensitive foamable composition comprising
- from about 50 to 80 percent by weight of at least one copolymer selected from the group consisting of ethylene vinyl acetate, ethylene methyl acrylate, ethylene butyl acrylate, ethylene ethyl acrylate, ethylene methacrylic acid, and mixtures thereof;
- from about 1 to 10 percent by weight of a microencapsulated blowing agent;
- from about 0 to 30 percent by weight of at least one tackifier;
- from about 0.5 to 5 percent by weight of at least one peroxide;
- from about 0 to 5 percent by weight of at least one chemical blowing agent;
- from about 1 to 10 percent by weight of a blowing agent activator;
- from about 0.25 to 5 percent by weight of at least one antioxidant;
- from about 0.5 to 5 percent by weight of at least one radiation crosslinking promoter;
- and
- from about 0 to 30 percent by weight of at least one filler
- wherein when the base and glass lamp are heated, the foamable coupling expands and securely affixes the glass lamp in the base.
A coupling for securely affixing one end of a light emitting glass lamp in a base, said coupling comprising a nonpressure sensitive adhesive foamable composition comprising:
- from about 50 to 80 percent by weight of at least one copolymer wherein the copolymer is selected from the group consisting of ethylene vinyl acetate, ethylene methyl acrylate, ethylene butyl acrylate, ethylene ethyl acrylate, ethylene methacrylic acid, and mixtures thereof;
- from about 1 to 10 percent by weight of a microencapsulated blowing agent;
- from about 0 to 30 percent by weight of at least one tackifier;
- from about 0.5 to 5 percent by weight of at least one peroxide;
- from about 0 to 5 percent by weight of at least one chemical blowing agent;
- from about 1 to 10 percent by weight of a blowing agent activator;
- from about 0.25 to 5 percent by weight of at least one antioxidant;
- from about 0.5 to 5 percent by weight of at least one radiation crosslinking promoter;
- and
- from about 0 to 30 percent by weight of at least one filler.
Dependencies are inferred from the claim text.