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Method of resin encapsulating electrical parts with UV curing of fire retardant resin

  • US 4,073,835 A
  • Filed: 01/30/1976
  • Issued: 02/14/1978
  • Est. Priority Date: 01/30/1976
  • Status: Expired due to Term
First Claim
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1. A process for encapsulating an electrical element comprising the steps of:

  • placing an electrical element in a mold made of an ultraviolet light transmissible material;

    introducing a liquid resin composition capable of being cross-linked and cured by the action of ultraviolet light and heat into the space between the mold and the electrical element enclosed therein, said composition containing a fire retardantselected from the group consisting of aluminum hydroxide, a combination of a halide and antimony oxide, and phosphoric acid esters and is contained in the liquid resin composition in an amount by weight of 10-70 parts per 100 parts by weight of the resin composition;

    irradiating said composition in the mold with ultraviolet light to crosslink and cure at least the outer portion of the liquid resin composition and make the resin removable from the mold without deformation;

    removing from the mold the at least partially crosslinked and cured resin composition with the electrical element enclosed therein; and

    heating said at least partially crosslinked and cured resin composition to complete the cure thereof, thus obtaining an encapsulated electrical element.

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