Hydraulic cements, methods and products

Inventors

Engqvist, H{dot over (a)}kan • Aberg, Jonas

Assignees

Ossdsign AB

Abstract

Non-aqueous hydraulic cement compositions comprise a non-aqueous mixture of a powder composition and a non-aqueous water-miscible liquid. In one embodiment, powder composition is a Brushite or Monetite-forming calcium phosphate powder composition. In another embodiment, the powder composition comprises porous β-tricalcium phosphate (β-TCP) granules and at least one additional calcium phosphate powder. In another embodiment, the powder composition comprises calcium silicate powder. In a further embodiment, the powder composition comprises calcium aluminate powder. In another embodiment, the powder composition is a cement composition and comprises nanopowders having a grain size of less than 1 micron. Hardened cements are formed from such hydraulic cement compositions, and methods of producing hardened cements, kits, and articles of manufacture employ such hydraulic cement compositions.

Core Innovation

The invention relates to non-aqueous, hydraulic cement compositions that include a non-hydrated Brushite- or Monetite-cement forming powder composition having a setting pH of less than 6.0. The powder composition includes porous β-tricalcium phosphate (β-TCP) granules and at least one additional calcium phosphate powder selected from monocalcium phosphate monohydrate, anhydrous monocalcium phosphate, or mixtures thereof, together with a non-aqueous water-miscible liquid.

A key aspect is combining porous β-TCP granules with additional calcium phosphate powder within the non-aqueous cement system, including specified ranges for the weight ratio of porous β-TCP granules to the additional calcium phosphate powder. The non-aqueous formulation is designed to hydrate upon contact with a hydrating liquid or vapor to form a hardened cement.

The disclosure further includes other non-aqueous hydraulic cement embodiments, including non-aqueous acidic Brushite/Monetite-forming calcium phosphate powders, non-aqueous calcium silicate systems, non-aqueous calcium aluminate systems, and nanopowder variants. Optional components are described, and delivery in kits or containers, including syringes, with vacuum packaging is described.

Claims Coverage

Two independent claims are explicitly provided. Across these claims, the inventive features focus on a non-aqueous hydraulic cement composition that uses a non-hydrated Brushite- or Monetite-cement forming powder with a setting pH below 6.0, porous β-TCP granules, an additional calcium phosphate powder, and a non-aqueous water-miscible liquid, with further compositional constraints in the more specific independent claim.

The independent claims cover a non-aqueous hydraulic cement composition built from a non-hydrated Brushite/Monetite-cement forming powder with setting pH < 6.0 containing porous β-TCP granules and an additional calcium phosphate powder, combined with a non-aqueous water-miscible liquid. The more specific independent claim further constrains the porous β-TCP-to-additional calcium phosphate weight ratio, requires glycerol as the liquid component, and sets a powder-to-glycerol weight-to-volume ratio range.

Stated Advantages

Documented Applications