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US 4,902,590 AGranted
Polyacrylic adhesive
AssigneeDuracell Inc.
InventorDavid V. Adamson
Life of this patent
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Abstract
An adhesive system, particularly suitable for the production of laminated separators for alkaline-electrolyte electrochemical cells, comprises a blend of a branched long chain polyacrylic acid with a substantially linear short chain polyacrylic acid, in an organic or aqueous solvent.
Claims8
An adhesive system comprising a blend of at least one polyacrylic acid of high molecular weight of between about 1.25 million to 5 million and at least one polyacrylic acid of low molecular weight of between about 2,000 and 500,000, in a solvent;
- wherein the high molecular weight polyacrylic acid comprises branched chains and the low molecular weight polyacrylic acid comprises substantially linear chains;
- and wherein the blend comprises amounts of high molecular weight polyacrylic acid and low molecular weight polyacrylic acid in ratios from 1:0.4 to 1:1.2 parts, respectively.
Dependencies are inferred from the claim text.