Process for the preparation of water blocking tapes and their use in cable manufacture
US6348236B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1996 |
| Grant date | Feb 19, 2002 |
| Priority date | — |
| Expiry date | Aug 23, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09J2433/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the manufacture of a water blocking tape for use in cable manufacture, which process comprises the steps of:(i) forming a coating of an aqueous solution of a water soluble polymer containing anionic groups and a multivalent ionic crosslinking agent on at least one surface of a substrate material selected from the group consisting of a metal foil, a plastic film, a plastic sheet, a multilayer film, and a laminate of at least two thereof; and(ii) drying and/or curing the coating in order to form a partially crosslinked water swellable polymer coating on the at least one surface of the substrate material. Water blocking tapes are also provided which comprise a substrate material having a coating on at least one surface thereof of a water soluble polymer containing anionic groups which is partially crosslinked with a multivalent ionic crosslinking agent. The preferred water soluble polymer containing anionic groups is an acrylic or methacrylic acid (co)polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.