Imperial Chemical Industries Limited

Other

Victrex Manufacturing Limited

James A Daniels

Howard M Colquhoun

Ian Richard Stephenson

David Frank Lewis

A skipping rope having at least one handle comprising an elongate hand grip, a mounting portion which is fixed to the hand grip and an attachment arrangement by which a rope or cord is affixed to the mounting portion, the attachment arrangement allowing the rope or cord to be secured to the mounting portion at any of a range of locations along its length.

Adjustable skipping rope

Aromatic polymers

The invention relates to novel polyarylethers which are essentially ketonic and which are based on the dibenzofuran molecule. Such polymers are, surprisingly, amorphous, have high Tg's eg&gt;200.degree. C., and have surprisingly high solvent resistance.

Aromatic polyethers are produced by polycondensing monomers containing phenolic groups and aromatic halogen, at least some of the aromatic halogen-containing monomers being free of activating groups such as --CO-- or --SO--, in the presence of a copper-containing catalyst and of a basic alkali metal compound present in stoichiometric excess relative to phenolic groups and copper. The products include new polyethers, particularly containing the repeating unit Ph.sup.1 --PH.sup.1 --O alone or with ketone containing or sulphone-containing units, where Ph.sup.1 is phenylene.

Aromatic polymer and process

A polymer essentially of ether linked repeating units

Aromatic polymer

An aromatic ketone having the formula XArCOPhPhOH is made by contacting an ester of formula XArCOOPhPh, where

Aromatic ketone

Polyaryletherketones are prepared by polymerization of a halogen-containing aryl ketone in the presence of a stoichiometric excess of a base and a copper salt. The halogen-containing aryl ketone may be 4-chloro-4'-hydroxybenzophenone. A basic copper salt may be used but the base used to provide the excess of base is an alkali metal hydroxide, carbonate or bicarbonate.

Polyketone

A process for the manufacture of 2-ethylidenehept-6-en-5-olide which comprises reacting in a liquid medium 1,3-butadiene with carbon dioxide in the presence of a palladium complex catalyst and a tertiary amine.

Growing community of inventors

Frodsham, United Kingdom

James A Daniels