Moldable intumescent materials containing novel silicone elastomers
AssigneesGeneral Motors Corporation, Delphi Technologies, Inc.
InventorsIsmat Ali Abu-Isa, Huide D. Zhu
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Abstract
Moldable intumescent thermoplastic elastomer materials are disclosed based on suitable proportions of polyethylene, chlorinated polyethylene and a silicone elastomer with silphenylene siloxane monomer moieties and stabilizers, all with foamers, char formers and fillers. Examples of suitable silphenylene-siloxane monomer moieties are 1,4-phenylene-hexamethyltrisiloxanyl and 1,4-phenylene-1,1,3,5,5-pentamethyl-3-vinyltrisiloxanyl where the respective methyl groups may be replaced with suitable phenyl groups or other lower alkyl groups and their fluorinated analogs.
Claims10
An intumescent thermoplastic molding which is the molded product of a blended mixture initially comprising on the basis of 100 parts by weight blended mixture:
- 15 to 25 parts high density polyethylene,
- 27 to 33 parts chlorinated polyethylene,
- 2 to 20 parts of a silicone elastomer consisting essentially of silphenylene-siloxane monomer moieties and having a value of Mw in the range of 30,000 to 800,000,
- 5 to 10 parts chlorowax,
- 7 to 16 parts of at least one of ammonium dihydrogen phosphate and ammonium polyphosphate,
- 9 to 17 parts of at least one of hydrated aluminum oxide and hydrated magnesium oxide,
- 3 to 10 parts of a char former selected from the group consisting of carbohydrates and polyhydric alcohols,
- 0 to 5 parts antimony oxide,
- 5 to 10 parts of a filler selected from the group consisting of glass fibers and mica particles, and
- an anti-oxidant for said polymeric composition.
A moldable mixture for making an intumescent molding, said mixture comprising on the basis of a total of 100 parts by weight:
- 15 to 25 parts high density polyethylene,
- 27 to 33 parts chlorinated polyethylene,
- 2 to 20 parts of silicone elastomer consisting essentially of silphenylene-siloxane monomer moieties and having a value of Mw in the range of 30,000 to 800,000,
- 5 to 10 parts chlorowax,
- 7 to 16 parts of at least one of ammonium dihydrogen phosphate and ammonium polyphosphate,
- 9 to 17 parts of at least one of hydrated aluminum oxide and hydrated magnesium oxide,
- 3 to 10 parts of a char former selected from the group consisting of carbohydrates and polyhydric alcohols,
- 0 to 5 parts antimony oxide,
- 5 to 10 parts of a filler selected from the group consisting of glass fibers and mica particles, and
- an anti-oxidant for said polymeric composition.
Dependencies are inferred from the claim text.