Moisture indicating hydrophilic polyurethane
AssigneeMölnlycke Health Care AB
InventorBryan Greener
Life of this patent
Estimating the term…
Abstract
The present invention relates at least in part to devices which are capable of indicating the presence of moisture. Embodiments of the present invention involve the provision of a solid dispersion of a color-forming material in a hydrophilic polyurethane material. In particular, although not exclusively, the present invention relates to devices comprising foam, e.g., hydrophilic polyurethane foam and a color former. Also included in the embodiments of the present invention are methods comprising the use of the devices, and other subject matter.
Claims33
An article for indicating presence of moisture comprising a material comprising a hydrophilic polyurethane and a colour-forming species,
- wherein the material does not comprise an excipient that is soluble in aqueous media,
- wherein the hydrophilic polyurethane is formed from a composition comprising at least 1% by weight of a methyl diphenyl diisocyanate (MDI)-based prepolymer, or
- wherein the hydrophilic polyurethane is formed from a composition comprising at least 1% by weight of a toluene diisocyanate (TDI)-based prepolymer, and
- wherein the colour-forming species is a molecule which can exist in at least two coloured states, wherein the colour-forming species exists in one of the coloured states when in contact with moisture.
Dependencies are inferred from the claim text.