Flame resistance natural fiber-filled thermoplastics with improved properties

A flame-retardant wood-plastic composition comprising:

• a cellulose fiber, said cellulose fiber is a member selected from the group consisting of “virgin” wood flour, recycled wood flour, wood fiber, hemp, flax, kenaf, rice hulls, bamboo, nut shells, and combinations thereof
• a thermoplastic polymeric material;
• from 0.1 wt % to 10 wt % of a coupling agent;
• from 1 wt % to 40 wt % of a flame retardant, the flame retardant is a member selected from the group consisting of:
• decabromodiphenyl oxide, bis(tribromophenoxy)ethane,
• tetrabromobisphenol A bis(2,3-dibromopropyl ether),
• phenoxy-terminated carbonate oligomer of tetrabromobixphenol A,
• tetradecabromodiphenoxybenzene,
• ethylenebixtetrabromophthalimide,
• brominated trimethyl indane,
• 2,4,6-tris(2,4,6-tribromophenoxy)-p1,3,5]-triazine, poly pentabromobenzyl acrylate,
• brominated epoxy oligomer of tetrabromobis phenol A,
• brominated polystyrene,
• tris(tribromoneopentyl)phosphate,
• 1,2,3,4,7,8,9,10,13,13,14,14-dodecachloro-1,4,4a,5,6,6a,7,10,10a,11,12,12a-dodecahydro-1,4,7,10-dimethanodibenzo(a,e)cyclooctene,
• tetrabromobisphenol S bis(2,3-dibromopropyl ether),
• ethylenebisdibromonorbomanedicarboximide,
• poly-dibromophenylene oxide,
• polydibromostyrene, tetrabromobisphenol A,
• tetrabromophthalate ester, and combinations thereof, and
• from 1 wt % to 20 wt % of a synergist, said synergist is a member selected from the group consisting of antimony trioxide, sodium antimonate, zinc sulfide, zinc stannate, zinc hydroxy stannate, zinc oxide, and combinations thereof.