Labofina, S.a.

Montefina S.a.

Jean-Noel M Bertrand

Jean Castelein

Disclosed are self-extinguishing polystyrenic compositions with improved thermal stability properties, comprising a styrenic resin and a fire-retardant agent which can either comprise solely a brominated pentaerythritol having at least one free-OH group or such a compound in combination with a peroxide.

Self-extinguishing polystyrenic compositions

Disclosed are rigid materials such as sheets, boards or tubes made of expanded polypropylene, which have a uniform specific gravity d of from about 4.1.times.10.sup.-6 to about 8.1.times.10.sup.-6 Newton/mm.sup.3, a crystallization temperature of from about 115.degree. C. to about 135.degree. C. and a flexural modulus Mf expressed in Newton/mm.sup.3 such that the ratio Mf:d is from about 1.5.times.10.sup.8 to about 1.7.times.10.sup.8 mm.

Expanded polypropylene and articles thereof

Disclosed are films made of expanded polypropylene, which have a uniform specific gravity d of from about 4.25.times.10.sup.-6 to about 6.50.times.10.sup.-6 Newton/mm.sup.3, a crystallization temperature of from about 115.degree. C. to about 135.degree. C. and an elastic modulus Me expressed in Newton/mm.sup.3 such that the ratio Me:d is from about 1.6.times.10.sup.8 to about 2.0.times.10.sup.8 mm.

Expanded polypropylene films

A polymer composition is disclosed which comprises polystyrene, polypropylene and a sequenced copolymer of conjugated diene and vinylaromatic compound such as styrene which has a radial structure. The polymer composition has improved migration properties.

Polymer compositions

Self-extinguishing polystyrenic compositions and process for their

Disclosed is a self-extinguishing polystyrenic composition comprising a polystyrenic resin, a fire-retardant amount of a halogenated organic fire-retardant agent and a nitrogen-containing organic compound selected from the group consisting of amines, amides and ammonium compounds containing from 20 to 40 carbon atoms and their mixtures, said nitrogen-containing compound being used in an amount varying between 0.5 and 50% based on the weight of fire-retardant agent.

Fire-retardant polystyrenic compositions

Disclosed is a self-extinguishing polystyrenic composition comprising a polystyrenic resin, a fire-retardant amount of a halogenated organic fire-retardant agent and a benzotriazolic compound having the formula ##STR1## wherein R.sub.1 is H or --CH.sub.3 and R.sub.2 is H or --CH.sub.2 N(R.sub.3).sub.2 wherein R.sub.3 is H, an alkyl radical containing from about 1 to 12 carbon atoms or --CH.sub.2 CH.sub.2 OH, in an amount between about 1 and 50% of the weight of said fire-retardant agent.

An improved fire retardant polystyrenic composition comprising a polystyrenic resin, a fire retardant agent selected from the group consisting of halogenated and phosphorous-containing fire retardant agents and combinations thereof, antimony oxide and an aliphatic nitrogen-containing compound selected from the group consisting of amines, amides and ammonium compounds containing from 8 to 25 carbon atoms, mixtures thereof and the oxyalcoylated derivatives thereof.

Growing community of inventors

Wezembeek-Oppem, Belgium

Jean-Noel M Bertrand