Halogen-free, flame retardant composition comprising crosslinked silane-g-EVA

Patent metadata

Field	Value
Publication number	US-9318240-B2
Application number	US-201013695862-A
Country	US
Kind code	B2
Filing date	May 24, 2010
Priority date	May 24, 2010
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

Halogen-free, flame retardant compositions comprising in weight percent based on the weight of the composition: A. 20 to 60% TPU/Si-g-EVA polymer blend in which the Si-g-EVA is crosslinked, B. 1 to 25% organic phosphate ester, C. 30 to 60% metal hydrate, and D. 0.1 to 10% epoxidized novolac. Optionally, the compositions further comprise in weight percent based on the weight of the composition, one or more of: E. 0.01 to 0.5% anti-dripping agent, F. 0.1 to 2% additive; and G. 0.1 to 5% filler.

First claim

The invention claimed is:

1. A halogen-free, flame retardant composition comprising in weight percent based on the weight of the composition:
A. 20 to 60% of a thermoplastic polyurethane/silane-grafted ethylene vinyl acetate (TPU/Si-g-EVA) polymer blend in which the Si-g-EVA is crosslinked and has a VA content of no greater than 30 wt %, wherein the thermoplastic polyurethane and silane-grafted ethylene vinyl acetate are phase separated,
B. 1 to 25% of an organic phosphate ester,
C. 30 to 60% of a metal hydrate, and
D. 0.1 to 10% of an epoxidized novolac.

2. The composition of claim 1 in which the TPU/Si-g-EVA polymer blend comprises 50 to 95 wt % of the TPU and 5 to 50 wt % of the Si-g-EVA, based on the weight of the TPU/Si-g-EVA polymer blend.

3. The composition of claim 2 in which the Si-g-EVA comprises a vinyl acetate content of 10-30 wt % based on the weight of the ethylene vinyl acetate (EVA) copolymer.

4. The composition of claim 3 in which the Si-g-EVA comprises a silane content of 0.5-10 wt % based on the weight of the EVA copolymer.

5. The composition of claim 4 in which the organic phosphate ester is at least one of resorcinol bi(diphenyl phosphate) (RDP) and bisphenol-A bis(diphenyl phosphate) (BPADP) and is present in an amount of 5 to 20 wt %.

6. The composition of claim 5 in which the metal hydrate is at least one of aluminum trihydroxide (ATH) and magnesium hydroxide and is present in an amount of 35 to 55 wt %.

7. The composition of claim 6 further comprising at least one of an anti-dripping agent, an antioxidant, UV-stabilizer, processing aid and filler.

8. The composition of claim 7 in which the TPU is at least one of polyether-based and polyester-based polyurethane and is present in an amount of 60 to 90 wt %, based on the weight of TPU/Si-g-EVA polymer blend.

9. An article comprising the composition of claim 1 .

10. The article of claim 9 in the form of a wire or cable covering.

Assignees

• Yan Wilson Xiao Wei
• Chen Given Jing
• Huang Lotus Hua
• Guo David Hong Fei
• Dow Global Technologies Llc

Inventors

• Yan Wilson Xiao Wei
• Chen Given Jing
• Huang Lotus Hua
• Guo David Hong Fei

Classifications

• C09K21/12

  containing phosphorus · CPC title

• H01B7/295 Primary

  using material resistant to flame · CPC title

• C08L75/06

  from polyesters · CPC title

• C08L31/04

  Homopolymers or copolymers of vinyl acetate · CPC title

• C08L75/04 Primary

  Polyurethanes · CPC title