Method of rotational molding a thermosetting article with a thermoplastic insert
AssigneePhillips Petroleum Company
InventorsJohn N. Scott, Jr., Guy E. Carrow
Life of this patent
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Abstract
Method of making a molded article comprising a hollow body of a crosslinked polymer rotationally molded around a section of at least one piece of non-crosslinked conduit, which conduits protrude from said hollow body, made by attaching said conduits of non-crosslinked material at the desired location to the mold with said section being located inside a heated section of the mold so that the crosslinkable polymer during a rotational molding process is fused and crosslinked inside of the mold and around and in tight welding-type connection with said section, whereas the remainder of the piece or pieces of uncrosslinked polymer are heat-insulated, thus avoiding deformation or collapsing of these pieces.
Claims9
A process for making a composite plastic article having a hollow body of crosslinked polymer material and at least one tube of thermoplastic polymer material bonded thereto, which process comprises:
- a. introducing a particulate crosslinkable polymer into a rotational mold including a hot section and at least one cool section;
- b. placing at least one tube of said thermoplastic polymer material into said mold in such a manner that:
- aa. a portion of said tube is located inside of the hot section of said mold, and
- bb. a remainder of said at least one tube is located in said cool section of said mold to avoid deformation of said tube during rotational molding;
- c. heating and rotating said mold to fuse and cross-link said crosslinkable polymer during said rotating, and to form, a layer thereof on an inside surface of said mold and bonding said layer and said portion of thermoplastic polymer material, thereby forming said article;
- d. cooling said mold and said polymer materials, and thereafter
- e. removing said article from the mold.
Dependencies are inferred from the claim text.