Adhesive composition which changes from colored to colorless upon application to a substrate
US5567753A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1995 |
| Grant date | Oct 22, 1996 |
| Priority date | — |
| Expiry date | Jan 27, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2666/28
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An adhesive composition which undergoes a change from colored to colorless upon application to a substrate. The composition comprises a shape-giving base, the shape-giving base comprising a gel of a gel-forming salt of an aliphatic carboxylic acid having from about 8 to 36 carbon atoms with a cation selected from the group consisting of alkali metals, ammonia and lower alkylamines in an aqueous liquid selected from the group consisting of water and mixtures of water with water-miscible organic solvents. In a preferred embodiment, the aforementioned gel-forming salt of an aliphatic carboxylic acid is sodium stearate. The composition additionally includes an adhesive component selected from the group consisting of water-soluble and water dispersible adhesives. In a preferred embodiment, the adhesive component is polyvinylpyrrolidone. The composition further includes triethanolamine and a colored indicator which upon exposure to air becomes colorless, the colored indicator being a phthalein, such as phenolphthalein. The adhesive composition is preferably in stick-form disposed in an applicator, such as a reclosable tube dispenser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.