Moldable intumescent polyethylene and chlorinated polyethylene compositions

• US 5,834,535 A
• Filed: 12/22/1996
• Issued: 11/10/1998
• Est. Priority Date: 08/21/1995
• Status: Expired due to Fees

• Current Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Abu-Isa, Ismat Ali, Jaynes, Craig Bryant
• Primary Examiner(s): Hoke, Veronica P.
• Application Number:
  US08/780,103
• Time in Patent Office: 688 Days
• Field of Search: 524/378, 524/377, 524/415, 524/416, 524/436, 524/437, 523/179, 521/106, 521/109.1, 521/116, 525/104, 525/106
• US Class Current: 523/179
• CPC Class Codes: C08L 2201/02 Flame or fire retardant/resistant
• CPC Class Codes: C08L 23/06 Polyethene
• CPC Class Codes: C08L 23/286 Chlorinated polyethylene
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: C09K 21/14 Macromolecular materials

Abstract

An intumescent thermoplastic elastomer molding composition is disclosed that includes high density polyethylene with chlorinated polyethylene and/or silicone rubber; a heat stabilizer for the thermoplastic elastomer material and an intumescent and fire-resistant additive for the thermoplastic elastomer, whereby moldings prepared from such mixture have good physical properties over a substantial range of ambient temperatures and display a resistance to flame and heat as characterized by the Intumescence Efficiency test of this specification.

Claims

1. 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,

5to 10 parts chlorowax,

7 to 16 parts of at least one of ammonium dihydrogen phosphate and ammonium polyphosphate,

9 to 17 parts of a least one of hydrated aluminum oxide and hydrated magnesium hydroxide,

3 to 10 parts of a char former selected from the group consisting of carbohydrates and polyhydric alcohols,

1 to 3 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.

5. An intumescent thermoplastic molding as recited in any of claim 1 in which the molding is a foamed molding.

2. An intumescent thermoplastic molding which is the molded product of a blended mixture initially comprising on the basis of 100 parts by weight of blended mixture:

18 to 23 parts high density polyethylene,

24 to 30 parts chlorinated polyethylene,

5 to 20 parts silicone rubber,

5 to 10 parts chlorowax,

5 to 10 parts of at least one of ammonium dihydrogen phosphate and ammonium phosphate,

14 to 20 parts of at least one of hydrated aluminum oxide and hydrated magnesium hydroxide,

4 to 10 parts of a char former selected from the group consisting of carbohydrates and polyhydric alcohols,

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.

3. A moldable mixture for making an intumescent thermoplastic molding, said mixture comprising on basis of a total of 100 parts by weight:

15 to 25 parts high density polyethylene,

27 to 33 parts chlorinated polyethylene,

5 to 10 parts chlorowax,

7 to 16 parts of a least one of ammonium dihydrogen phosphate and ammonium polyphosphate,

9 to 17 parts of at least one of hydrated aluminum oxide and hydrated magnesium hydroxide,

3 to 10 parts of a char former selected from the group consisting of carbohydrates and polyhydric alcohols,

1 to 3 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.

6. A moldable mixture for an intumescent thermoplastic molding as recited in any of claims 3 or 4 in which the molding is a foamed molding.

4. A moldable mixture for making an intumescent thermoplastic molding, said mixture comprising on the basis of a total of 100 parts by weight:

18 to 23 parts high density polyethylene,

24 to 30 parts chlorinated polyethylene,

5 to 20 parts silicone rubber,

5 to 10 parts chlorowax,

5 to 10 parts of gas-generating additives comprising at least one of ammonium dihydrogen phosphate and ammonium phosphate,

14 to 20 parts of at least one of hydrated aluminum oxide and hydrated magnesium hydroxide,

4 to 10 parts of a char former selected from the group consisting of carbohydrates and polyhydric alcohols,

5to 10 parts of a filler selected from the group consisting of glass fibers and mica particles, and

an anti-oxidant for said polymeric composition.