Viscous carrier compositions, including gels, formed with an organic liquid carrier, a layered material: polymer complex, and a di-, and/or tri-valent cation
US5998528A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1998 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Feb 2, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/64
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Intercalates formed by contacting the layer material, e.g., a phyllosilicate, with an intercalant to sorb or intercalate the between adjacent platelets of the layered material. Sufficient intercalant polymer is sorbed between adjacent platelets to expand the adjacent platelets at least about 5 .ANG. (as measured after water removal to 5% by weight water), up to about 100 .ANG. and preferably in the range of about 10-45 .ANG., so that the intercalate easily can be exfoliated into individual platelets. A monovalent, divalent and/or trivalent cation is added to the intercalating composition, or after intercalation for surprising increases in viscosity. The intercalated complex is combined with an organic liquid into an unexpectedly viscous carrier material, for delivery of the carrier material, or for delivery of an active compound, e.g., a pharmaceutical, or cosmetic, or lubricant, e.g., food grade lubricants dissolved or dispersed in the carrier material. Alternatively, the intercalated complex can be exfoliated prior to combination with the organic liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.