Patent ID: 8563663

Claim:
Thermosetting composition, characterized in that it is devoid of any halogenated additive and of any halogenated structure in its components and comprises: a) per 100 parts by weight of a resin, which weight is expressed as weight of dry resin, comprising: a1) at least one unsaturated polyester, having an acid number of less than 10, or a combination of a1) with a2) at least one vinyl ester, b) 40 to 200 parts by weight of at least one reactive diluent selected from ethylenically unsaturated monomers copolymerizable with the said resin, c) 20 to 110 parts by weight of at least one agent for expansion by thermal decomposition, which agent is selected from the group consisting of: melamine and derivatives thereof, guanidine, glycine, urea, triisocyanurates and azodicarbonamide, d) 0 to 250 parts by weight of aluminium trihydrate, e) 10 to 80 parts by weight of at least one agent which is a precursor of charring selected from the group consisting of: sugars, starch, potato flour, pentaerythritol (PET) and derivatives of PET, erythritol and sorbitol, f) 50 to 200 parts of at least one compound selected from the group consisting of a phosphorus derivative selected from the group consisting of phosphonates, phosphates and polyphosphates and corresponding acids and salts thereof, and red phosphorus, and at least one boric acid derivative, g) optionally at least one metal oxide, h) optionally an additive, filler, or both, i) optionally reinforcements based on at least one of natural fibres, synthetic fibres, corresponding fabrics, and in that said polyester a1) is based on an acid component composed of at least 60 mol % of maleic acid and/or anhydride and on a polyol component composed of at least 70 mol % of propylene glycol, with a remainder being selected from the group consisting of dipropylene glycol, ethylene glycol, diethylene glycol, neopentyl glycol, 2-methylpropanediol, butanediols, pentanediols and hexanediols.