Imperial Chemical Industries Limited

Peter J Smith

David Boyd Baird

Bernard John Cross

Brian R Fishwick

Alan T Costello

Robert D McClelland

Robin A Woolhouse

Stuart Corr

Denis Robert Ridyard

James Stanley Campbell

Raymond Price

Janusz J Krause

Brian Ribbons Fischwick

Keith G Moss

A closed-cell polymer foam having a density of less than 100 kg.m is described. The cells in the foam contain a foam blowing agent comprising (a) a blend of two or more hydrofluorocarbons, (b) a blend comprising a carbon dioxide and one or more hydrofluorocarbons or (c) a blend comprising dimethyl ether and one or more hydrofluorocarbons, and the polymer is a blend comprising at least 50% by weight of an olefinic polymer(s) and up to 50% by weight of a polar polymer(s) having a lower molecular weight than the olefinic polymer which when in the heat plasticised state is able to dissolve the foam blowing agent. A process for preparing the foam is also described.

Closed cell polymer foam

Foamed articles of styrenic and acrylic polymers blend

Foamed articles

Foaming method

The specification describes cellulose reactive unsymmetrical triphenodiaxazine dyes of the Formula (1): ##STR1## wherein each of T.sup.1 and T.sup.2, independently, represents H, Cl, Br, F, SO.sub.3 H or an optionally substituted alkyl or aryl radical;

Unsymmetrical triphenodixoazine reactive dyes

Unsymmetrical triphendioxazine (TPD) reactive dyes of Formula (1) for the colouration of e.g. wool, silk, leather and cotton are claimed as well as intermediates for their manufacture. ##STR1## wherein W.sup.1 and W.sup.2 are different and each independently of the formula: ##STR2## R.sup.1 and R.sup.2 in each group defined by W.sup.1 or W.sup.2 independently represent H or an optionally substituted hydrocarbon radical or are joined together to form, with B and the two N atoms, a piperazine ring;

Unsymmetrical triphenodioxazine dyes

Triphenodioxazine reactive dyes containing at least one fiber-reactive group, the dye, in the free acid form, having the formula: ##STR1## wherein each of T.sup.1 and T.sup.2, independently, represents H, Cl, Br, F, SO.sub.3 H or an optionally substituted alkyl or aryl radical;

Reactive dyes

A method of producing an ion-exchange membrane suitable for use in an electrolytic cell in which the membrane is expanded by stretching at elevated temperature to increase the surface area per unit weight of the membrane. The membrane may be annealed at elevated temperature, and may be cooled while restrained in the expanded state. The membrane when used in an electrolytic cell remains taut and unwrinkled and leads to reduced voltage operation of the cell.

Production of stretched ion-exchange membrane

An ion-exchange membrane of a sheet of an organic polymer comprising a plurality of fixed anonic groups associated with cations which comprise an organic group, e.g. quaternary ammonium cations, a process in which the membrane sheet is expanded by dry stretching to increase the surface area per unit weight of the membrane, a process for its preparation, a process for converting the stretched membrane to one suitable for use in an electrolytic cell, and that use.

Production of ion-exchange membrane

Treating a sheet of ion-exchange membrane in order to decrease the voltage of operation of an electrolytic cell containing the membrane by swelling the membrane in a liquid medium, the extent of swelling on the anode side being greater than the extent of swelling on the cathode side, and the extent of swelling on the anode side being greater than that effected by contacting the membrane with the electrolyte to be electrolyzed.

Treatment of ion-exchange membrane

Disperse monoazo dyestuffs, free from carboxylic and sulphonic acid groups, derived from 3,5-dinitro-2-amino thiophene as disazo component and an arylamine coupling component exhibit superior properties when used to give colorations to textile materials such as secondary cellulose acetate and cellulose triacetate, polyamide and aromatic polyester textile materials, said colorations having excellent fastness to light and to wet and dry heat treatments. The dyestuffs also have high tinctorial strength and excellent dyeing and build-up properties and produce depths of shade which are relatively independent of the dyebath pH, or the temperature of the dyebath or the liquor ratio of the dyebath.

Disperse monoazo dyestuffs derived from 3,5-dinitro-2-amino thiophene as

The compounds of the formula ##STR1## wherein X is a lower alkylsulphonyl, phenylsulphonyl, cyano, carbonamido, carboxylic acid or carboxylic acid ester group;

2-Aminothiophenes

The disperse monoazo dyestuffs, free from sulphonic acid groups, which are of the formula: ##STR1## wherein X is hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, --NR.sup.1 R.sup.2, --SR.sub.3, chlorine, bromine --OR.sup.3 or --SO.sub.2 R.sup.3 ;

Disperse azo dyestuffs derived from a 3-amino-7-azabenz-2,1-isothiazole

The water-insoluble monoazo dyestuffs, free from sulphonic acid and carboxylic acid groups, which are of the formula: ##STR1## wherein Y is hydrogen, lower alkyl, optionally substituted phenyl or nitro; Z is nitro, cyano, optionally substituted phenyl, optionally substituted lower alkoxycarbonyl or carbonamido; T is hydrogen, optionally substituted lower alkyl or optionally substituted lower alkoxy; W is an acylamino group of the formula: ##STR2## wherein X.sup.1 is hydrogen or lower alkyl, X.sup.2 is hydrogen or an optionally substituted hydrocarbon or heterocyclic radical, and A is a direct link or --0-- or ##STR3## and R.sup.1 and R.sup.2 each independently represent a hydrogen atom or an optionally substituted alkyl radical or R.sup.1 and R.sup.2 together form with the nitrogen atom N a 5- or 6-membered nitrogen-containing heterocyclic ring, a process for the manufacture of the said dyestuffs by diazotization and coupling, and the use of the said dyestuffs for coloring synthetic textile materials, in particular aromatic polyester textile materials which they color in violet to green shades possessing excellent fastness to light, to wet treatments and to dry heat treatments.

Disperse monoazo dyestuffs containing a thiophene residue

Optionally substituted benzimidazoles containing an alkyl or cycloalkyl group in position 1 and containing at least 5 alkyl or cycloalkyl carbon atoms extract metals from aqueous solutions of their salts into water-immiscible organic solvents in presence of halide ion. Benzimidazoles having a branched-chain alkyl group of at least 7 carbon atoms in position 1, and especially mixtures of such compounds, are most effective. The benzimidazoles are particularly useful for extracting cobalt selectively from mixtures of cobalt and nickel salts. The metals can be recovered from the organic solvent by extraction into water free from halide ion.

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Cheshire, United Kingdom

Peter J Smith