Enichem Synthesis S.p.a

Montedison S.p.a.

Eniricerche S.p.a.

Istituto Guido Donegani S.p.a.

Enichem Sintesi S.p.a.

Gianluigi Landoni

Carlo Neri

Antonio Rinaldi

William Giroldini

Osvaldo Cicchetti

Spartaco Fontani

Silvestro Costanzi

Guido Bertelli

Renato Locatelli

Gioacchino Cipriani

Francesco Gratani

Pierpaolo Roma

Renzo Fontanelli

John W Gilmer

Neri Carlo

Giovanni Legnani

A linear copolyester is prepared by polycondensation of an aromatic bicarboxylic acid with an alkylene glycol and with a carboxyphosphinic acid or anhydride which produces monomeric units having the formula: ##STR1## wherein R.sub.1 is an alkylene or phenyl radical and R.sub.2 is an alkyl or phenyl radical. This copolyester can be used as a flame-retardant additive for organic polymers.

Linear copolyester containing phosphorous, procedure for its preparation

Poly(Pentaerythrityl diphosphonate) of formula (I): ##STR1## wherein n is an integer having a value comprised within the range of from 3 to 100. The poly(pentaerythrityl diphosphonate) of formula (I) is useful as a flame retardant additive for thermoplastic polymers.

Poly(pentaerythrityl diphosphonate) and its use in self-extinguishing

Polyolefinic fibres and films are made flame-resistant by the addition of a flame-resistant additive made up of a copolyester containing units deriving from: a) terephthalic acid; b) alkylenic glycol (C.sub.2 --C.sub.6) ; and c) phenyl hydroxymethylene phosphinic acid. These fibres and films are prepared by the transformation into its molten state of a mixture of polyolefin and flame-resistant additive.

Flame-resistant polyolefinic fibres and films

A new group of pentaerythryl diphosphonates and poly(pentaerythryl diphosphonates) are described. Flame-retardant compositions are also described, which include a thermoplastic polymer and a certain amount of self-extinguishing agent consisting of one of the above-mentioned pentaerythryl diphosphonates or poly(pentaerythryl diphosphonates).

New pentaerythryl phosphonates containing self-extinguishing

The present invention relates to fast-crystallizing polyester compositions comprising: (a) a thermoplastic polyester resin; (b) a nucleating agent of the formula: ##STR1## wherein: R is an alkali or alkaline-earth metal; m is 1, 2 or 3; n takes an average value within the range of 1 to 5; said nucleating agent being optionally admixed with the compound of formula (I) wherein R is a hydrogen atom, linear alkyl radial or branched alkyl radical each having from 1 to 6 carbon atoms; with the proviso that at least 50% mole of said nucleating agent is in the salt form. This nucleating additive raises the crystallization temperature upon cooling (T.sub.cc) of the polyester so that crystallization occurs rapidly during molding.

Fast-crystallizing polyester compositions

Pentaerythryl phosphonates and their use in self-extinguishing

Acrylic or alkyd resin and polyester based covering or coating compositions are stabilized against the action of light and moisture by adding, possibly in the presence of conventional stabilizers and antioxidants, at least one compound containing at least one N-substituted, sterically hindered piperidino, morpholino or pyrrolidino group, and at least one silyl function, or a polymer structure with a polyorganosiloxane structure containing sterically hindered piperidino groups in the molecule.

Method for stabilizing lacquers and coatings, and the stabilized

A linear copolyester, useful as a flame retardant agent, contains in its macromolecule units derived from: (a) terephthalic acid; (b) (C.sub.2 -C.sub.6)-alkylene glycol; (c) phenyl-hydroxymethylene phosphinic acid, in a mutual ratio comprised within the range of from 1:1:0.2 to 1:1:1, and is obtained by placing a linear polyester derived from terephthalic acid and a (C.sub.2 -C.sub.6)-alkylene glycol into contact with a poly(phenylhydroxymethylene phosphinate) (I): ##STR1## wherein: Ph is the phenyl radical; R is a hydrogen atom or a linear or branched alkyl radical containing from 1 to 8 carbon atoms; and D is from 2.5 to 100, under melting conditions, and for a contact time not longer than about 30 minutes. Such a copolyester contains the (c) units randomly distributed throughout the macromolecular chain, has an amorphous or partially crystalline structure as a function of its content of said (c) unit, and is useful in order to endow the linear polyesters, also in mixture with one another (polymeric alloys), with flameproof characteristics.

Linear, phosphorus-containing copolyester, process for its preparation

Compositions of thermoplastic polymers comprising, in mixture, a thermoplastic polymer and a mixture of self-extinguishability-conferring additives, formed by:

Self-extinguishing compositions of thermoplastic polymers

Self-extinguishing polymeric compositions based on thermoplastic polymers, comprising, for 100 parts by weight of total composition:

Self-extinguishing polymeric compositions

There is disclosed a solid and water-insoluble condensation product of N,N'-ethyleneurea with formaldehyde, having the structure ##STR1## wherein n is an integer from 20 to 60 with a mean value of 41, and having an average number molecular weight M.sub.n ranging from 2000 to 6000. Said product, when added to a polymer in combination with an ammonium phosphate, results in the production of articles which are resistant to heat and to thermo-oxidation.

Condensation product prepared from N,N'-ethylene-urea and formaldehyde

Thermoplastic polymers, such as polypropylene, are rendered anti-flaming and self-extinguishing by addition of ammonium or amine phosphate and a nitrogen-containing water-insoluble oligomer or polymer containing in the monomeric unit a --CO--group attached to a ##STR1## group, wherein n is 2 or 3, being part of a ring, e.g., poly(carbonylpiperazine).

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Milan, Italy

Gianluigi Landoni