Pregummed remoistenable tape having long open time and short tack time
US3950593A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1973 |
| Grant date | Apr 13, 1976 |
| Priority date | — |
| Expiry date | Mar 26, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2666/28
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A pregummed, remoistenable tape having long open time and short tack time which utilizes adhesive formulations using acid hydrolyzed, derivatized waxy maize starch as a component to replace animal glue in remoistenable pregummed tape formulations. Wet tack strength is equal or better than "all-animal glue" adhesives presently used, especially for short open times. In one embodiment, the major ingredient in the adhesive coating of the pregummed tape comprises waxy maize starch which is first acid-hydrolyzed and then copolymerized with acrylamide monomer using a free radical initiator in an aqueous system. In another second embodiment, acid-hydrolyzed, cyanoethylated waxy maize starch provides the major adhesive ingredient which replaces a substantial portion of the animal glue in the adhesive composition used to coat the pregummed tape. It is also contemplated that substantially all of the animal glue in the new formulation can be replaced for certain applications with a synthetic organic compound such as polyvinyl alcohol. These combination vegetable-animal base adhesives and the vegetable synthetic type adhesives may be used to replace animal glue based adhesives, and provide impr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.