Intumescent electrical installation systems and processes for their production

• US 20040030004A1
• Filed: 03/18/2003
• Published: 02/12/2004
• Est. Priority Date: 03/19/2002
• Status: Abandoned Application

• Current Assignee: Imtumex GmbH
• Original Assignee: Imtumex GmbH
• Inventors: Horacek, Heinrich, Pickhard, Walter
• Application Number:
  US10/389,777
• Publication Number:
  US 20040030004A1
• Time in Patent Office: Days
• US Class Current: 523/179
• CPC Class Codes: H02G 3/0412 Heat or fire protective means for fire in electric circuits A62C3/16

Abstract

Intumescent, electrical installation systems which comprise an injection molding material of polyolefins or polyimides in combination with intumescent additives, the melting points of the polyolefins and of the polyimides being lower than the intumescence temperature of the intumescent additives.

Claims

1. An intumescent, electrical installation system, which comprises an injection molding material of polyolefins or polyimides in combination with intumescent additives, the melting points of the polyolefins and of the polyimides being lower than the intumescence temperature of the intumescent additives.

2. The intumescent, electrical installation system as claimed in claim 1, wherein thermoplastic polyolefins from the group consisting of polyethylene having a low density to high density, ethylene-vinyl acetate copolymers, ethylene-butyl acrylate copolymers, polypropylene, poly-1-butene, poly-(methylpentene), copolymers of ethylene and octene, ethylene/propylene-diene terpolymers or mixtures thereof are used as the polyolefin.

3. The intumescent, electrical installation system as claimed in claim 1, wherein the polyimides used are those which are present as a low-melting precursor and form highly crosslinked products by addition reactions under the action of heat.

4. The intumescent, electrical installation system as claimed in claim 1, wherein ammonium polyphosphate, ammonium dihydrogen phosphate, ethylenediamine phosphate, ammonium pentaborate, melamine, dicyandiamide, full phosphoric esters with polyols, dipentaerythritol, pentaerythritol, sugar, dextran, starch, vermicular graphite, waterglass, expanded mica, vermiculite, perlite and mixtures thereof are used as intumescent additives.

5. The intumescent, electrical installation system as claimed in claim 1, wherein the injection molding material contains inorganic fillers from the group consisting of, for example, kaolin, clays, mica, wollastonite, calcium silicates, titanium dioxide, zinc borate, quartz, zinc oxide, apatite, talc, aluminum phosphates, ATH, Mg(OH)₂, chalk, glass fibers or mineral fibers.

6. The intumescent, electrical installation system as claimed in claim 5, wherein clays or micas which are present as nanoparticles in the mixture of polymer, intumescent additive and filler are used as the inorganic filler.

7. The intumescent, electrical installation system as claimed in claim 1, wherein the injection molding material contains dispersants from the group consisting of zinc stearate or calcium stearate, glyceryl stearate, pentaerythrityl tetrastearate, cetyl palmitate, ethylenedistearoyldiamide C₁₄-C₁₈ fatty alcohols, dicarboxylic esters, fatty amines or paraffins.

8. The intumescent, electrical installation system as claimed in claim 1, wherein the material thickness is such that it corresponds to the volume of the installation system divided by the product of twice the lateral surface area and the maximum expansion factor, so that the installation system is completely filled with foam by intumescence and a compression factor of 2 is present.