Polymer blend
AssigneeIonphase Oy
InventorJyri Nieminen
Life of this patent
Estimating the term…
Abstract
The invention relates to a polymer blend and a process for its preparation. The polymer blend contains A) a polymer of an olefin and an unsaturated carboxylic acid, wherein the amount of acid groups is 0.5-15 molar %, and B) a polyether block polymer made up of a polyether block and a polyamide or polyester block, the acid groups in polymer A and the polyether blocks in polymer B having at least partly coordinated alkali ions, and an alkali metal being present in an amount of approx. 0.02-3 millimols/gram of the polymer blend. The blend according to the invention has a good electrical conductivity and excellent mechanical properties.
Claims22
An electrically conductive polymer blend, characterized in that it contains
- A. a polymer of an olefin and an unsaturated carboxylic acid, wherein the quantity of acid groups is 0.5-15 molar %, and
- B. a block polyether polymer made up of a polyether block and a polyamide or polyester block,
- the acid groups of polymer A and the polyether blocks of polymer B having coordinated, at least partly, alkali ions, and
- an alkali metal being present in an amount of approx. 0.02-3 millimols/one gram of the polymer blend.
The polymer blend according to any of the preceding claims, characterized in that polymers A and B are present in the blend in parts by weight A/B 90/10-10/90, preferably 85/15-20/80.
The polymer blend according to any of the preceding claims, characterized in that the surface resistance (ASTM D-257) of the polymer blend is less than 108 ohm.
The polymer blend according to any of the preceding claims, characterized in that the water absorption of the polymer blend is less than 10% by mass/24-h immersion.
The polymer blend according to any of the preceding claims, characterized in that the polymer blend passes the cytotoxicity test.
The polymer blend according to any of the preceding claims, characterized in that the cations are added as hydroxides, oxides, formiates, acetates, or mixtures thereof.
The polymer blend according to any of the preceding claims, characterized in that the alkali kation is from the group made up of sodium, potassium, rubidium and cesium.
The polymer blend according to any of the preceding claims, characterized in that one cation is potassium.
A process for preparing an electrically conductive polymer composition, characterized in that there are mixed together at an elevated temperature
- 90-10 parts by weight of a copolymer made up of an olefin and an unsaturated carboxylic acid,
- 10-90 parts by weight of a block polyether, and
- an alkali metal compound the amount of which corresponds to 0.02-3 millimols of the alkali metal ion/1 gram of the polymer blend.
Dependencies are inferred from the claim text.