Ciba-Geigy Corporation

Solvay Interox Gmbh

Solvay (Societe Anonyme)

Robert C Wasson

Emyr Phillips

David G Leppard

Adalbert Braig

Hans-Rudolf Meier

Robert M O'Neil

William R Sanderson

Alexander Johnstone

Ivan Lode Andr&eacute; Maria Claeys

Amanda J Dutton

Amanda Jane Dutton

Poly(lactones) are provided. The poly(lactones) are obtained by polymerization of a lactone with an initiator system comprising at least one polyfunctional initiator. The poly(lactones) have a shear viscosity at some temperature in the range of from 35 to 45&deg; C. above the melting temperature of the poly(lactone) of at least 6 kPas at 0.1 s,shear rate and no greater than 3.5 kPas at 100 s,shear rate, and a shear viscosity activation energy of greater than 40 kJ/mol. Preferably, the poly(lactone) is poly(caprolactone).

Polymers having improved processability

Products intended for use as hand mouldable materials should meet the objectives of not causing pain to the user when held in the hand, and retaining malleability for a sufficient but not excessive length of time. The invention hand-mouldable compositions comprise selected copolymers of lactones and lactides which manifest a melt temperature T.sub.m in the range of from 48 to 58.degree. C. and a crystallisation temperature T.sub.c in the range of from 16 to 30.degree. C. They are preferably produced from .epsilon. caprolactone and L-lactide, most desirably in a weight ratio of from 94:6 to 91:9, and especially at a reaction temperature in the range of from 150 to 190.degree. C. They are often coloured and can be employed in kits.

Thermoplastic polymers

Macromonomer preparation

Selective hydroxylation of phenol or phenolic ethers

A process for inhibiting corrosion involves new compositions which comprise an organic material and, a corrosion inhibitor which is a compound having the formula: ##STR1## wherein R.sup.1 and R.sup.2 may be the same or different and each is hydrogen, C.sub.1 -C.sub.15 alkyl, C.sub.3 -C.sub.15 alkenyl, C.sub.7 -C.sub.10 phenylalkyl, C.sub.6 -C.sub.18 aryl having 6 or 10 aromatic ring carbon atoms; or C.sub.5 -C.sub.12 cycloalkyl;

Process for inhibiting corrosion

The present invention provides coating compositions comprising

Method of producing an organic, corrosion-resistant surface coating

Compounds of the formula I ##STR1## wherein R, R.sup.1, R.sup.2, R.sup.3, and R.sup.5 have the meaning given in claim 1 are formed by thermal rearrangement of the isomers of formula V ##STR2## especially in the presence of basic catalysts. The compounds are corrosion inhibitors for organic materials, in particular coating materials and lubricants. In these substrates they also act as antioxidants and light-stabilizers and are very stable to heat.

Processes for preparing phenolic benzothiazole derivatives

Coating compositions containing water-insoluble salts of keto-acids

Compounds of the formula I ##STR1## wherein R, R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 have the meaning given in claim 1 are formed by thermal rearrangement of the isomers of formula V ##STR2## especially in the presence of basic catalysts. The compounds are corrosion inhibitors for organic materials, in particular coating materials and lubricants. In these substrates they also act as antioxidants and light-stabilizers and are very stable to heat.

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Penketh, United Kingdom

Robert C Wasson