Imperial Chemical Industries Limited

Ian G Williams

Anthony D Caunt

Michael Stanley Fortuin

Alan B Newton

John P Candlin

George David Appleyard

A fire retardant, impact resistant polyamide composition containing 1 to 25% of a rubbery copolymer containing functional groups derived from maleic, fumaric, norbornadiene and succinic anhydrides or an alicyclic carboxylic acid or functional derivative thereof having a cis-form double bond in the ring, 10 to 30% of a halogenated polymer having a weight average molecular weight greater than 5,000 and a synergist for the halogenated fire retardant. The composition provides a good level of impact strength in combination with a high level of fire retardancy. A particularly good balance of properties can be obtained from compositions containing fillers, especially glass fibres.

Flame retardant, impact resistant polyamide compositions

A fire retardant polyamide composition comprising at least 35% by weight of polyamide having a molecular weight of at least 3000, at least 3.5% but preferably not more than 10% by weight of the condensation product of 2 moles perchlorocyclopentadiene and 1 mole of 1,5-cyclooctadiene, at least 2%, preferably at least 4% desirably not more than 10% by weight of melamine, a salt of melamine or an organic derivative of melamine and at least 0.5%, but preferably not more than 5.0% of at least one oxide selected from iron oxide and tin oxide, wherein the weight ratio of chlorinated compound to oxide is between 1:1 and 10:1 preferably between 2:1 and 6:1 and the constituents of the composition total 100%. The composition provides improved burning performance in the UL94 test in that dripping is prevented. The composition also provides acceptable burning performance at a lower concentration of total additives than when halogenated fire retardant/synergistic oxide combinations are used.

Fire retardant polyamide compositions

A glass-reinforced, fire-retardant, arc-track resistant polyamide composition characterized in that it contains:

Flame retardent polyamide compositions

A reinforced, fire retardant, polyamide composition containing

Flame retardant polyamide compositions

A glass-reinforced, fire-retardant, arc-track resistant composition characterized in that it contains:

A solid compound of a transition metal is ground in the presence of aluminium chloride, titanium tetrachloride and at least one organo-Lewis Base compound. The transition metal compound is typically titanium trichloride. The Lewis Base compound is an organo-phosphorus compound, preferably one which also contains nitrogen, such as 2-dimethylamino-1,3-dimethyl-1,3,2-diazaphospholidine-2-oxide or an organo-sulphur compound such as diphenyl sulphone. The solid compound of the transition metal may include aluminium chloride and if the amount of this aluminium chloride is at least 50% molar, there is no need to make a separate addition of aluminium chloride to the mixture which is ground. The ground product can be used as a component of an olefine polymerization catalyst.

Transition metal compound

A solid compound of a transition metal is ground in the presence of aluminum chloride; titanium tetrachloride and at least one specified organic sulphur-containing compound are added, the whole mixture is ground and the ground product is then washed with an aromatic liquid. The transition metal compound is typically titanium trichloride. The organic sulphur-containing compound can be a sulphone, a sulphonamide or a condensed ring system containing at least one heterocyclic sulphur atom. The organic sulphur-containing compound can be diphenylsulphone. The solid compound of the transition metal may be one which also includes aluminum chloride. The quantities of materials added to the transition metal compound are, for each mole of the transition metal compound, 0.10 up to 2.50 moles of the organic sulphur-containing compound, 0.01 up to 0.50 mole of titanium tetrachloride and 0.01 up to 2.50 moles of aluminum chloride. The ground and washed product can be used as a component of an olefine polymerization catalyst.

Process for the production of polymer or copolymer of an olefin monomer

A titanium trihalide is ground with an organic Lewis Base compound which contains at least one phosphorus atom, and optionally at least one nitrogen atom, and a titanium tetrahalide, the Lewis Base and the titanium tetrahalide being used in amounts of 5 to 75, preferably 5 to 50%, molar and 1 to 50, preferably 5 to 30% molar respectively relative to the titanium trihalide. The materials are conveniently milled together and the milled product can be used as a component of an olefine polymerization catalyst and when such catalysts are used to polymerize propylene a high activity is achieved together with satisfactory stereospecificity.

Olefine polymerization process

A solid compound of a transition metal is ground in the presence of aluminium chloride; titanium tetrachloride and at least one specified organic sulphur-containing compound are added, the whole mixture is ground and the ground product is then washed with an aromatic liquid. The transition metal compound is typically titanium trichloride. The organic sulphur-containing compound can be a sulphone, a sulphonamide or a condensed ring system containing at least one heterocyclic sulphur atom. The organic sulphur-containing compound can be diphenylsulphone. The solid compound of the transition metal may be one which also includes aluminium chloride. The quantities of materials added to the transition metal compound are, for each mole of the transition metal compound, 0.10 up to 2.50 moles of the organic sulphur-containing compound, 0.01 up to 0.50 mole of titanium tetrachloride and 0.01 up to 2.50 moles of aluminium chloride. The ground and washed product can be used as a component of an olefine polymerization catalyst.

Treatment of transition metal compound

Process for preparing a transition metal compound and it's use as a

A polymerization catalyst comprises a solid transition metal compound which has been ground with a Lewis Base, an organo-metallic compound of a non-transition metal and a cyclic polyene, preferably with a further quantity of the same, or a different, Lewis Base. The catalyst can be used to polymerize propylene to give a high yield of a polymer having a flexural modulus in excess of 1.00 GN/m.sup.2.

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Letchworth, United Kingdom

Ian G Williams