Soft zero halogen flame retardant thermoplastic elastomers

Details Soft zero halogen flame retardant thermoplastic elastomers Soft zero halogen flame retardant thermoplastic elastomers

2007-11-13

2010-12-14

Sastri, Satya B (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S098000, C525S097000, C525S099000, C525S330300, C524S414000

Reexamination Certificate

active

07851559

ABSTRACT:
Soft flame retardant thermoplastic compositions that are preferably halogen free and include a styrenic block copolymer having a low modulus, one or more of a polyolefin polymer or copolymer and an acrylate containing polymer or copolymer, one or more of a softener and plasticizer, an inorganic phosphorous-containing flame retardant, and optionally but preferably, a platelet filler such as a nanoclay or an organic modified clay. In a preferred embodiment, the phosphorous-containing flame retardant has a surface coating thereon which reduces sensitivity of the flame retardant to water, and thus reduces the amount of the flame retardant that can leach out in the presence of water, thereby enabling the compositions of the present invention to be utilized outdoors or other environments where exposure to water or high humidity is possible. The hardness of the compositions according to the invention preferably ranges from about Shore A 40 to about Shore A 90. The compositions exhibit high char formation upon burning and also desirable vertical burn characteristics.

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