Container with an at least partially triangular prismatic body

1. A container made of a thermoplastic material having a body which, for at least a part of its height, is substantially prismatic in shape with a substantially triangular cross section and with three faces joined by three edges,

wherein each of said edges is shaped in the form of a groove which opens outwards and which has a rear wall having a reversed curvature with its convexity directed outwards.

2. The container according to claim 1 , wherein apex of said convexity of said rear wall of said groove is substantially level with the edges of said groove.

3. The container according to claim 1 , wherein said body is substantially prismatic in shape in its middle part only, which lies between an upper part and a lower part that are both substantially cylinders of revolution and have transverse dimensions substantially greater than the transverse dimension of said middle part.

4. The container according to claim 3 , wherein each groove extends as far as the join between said middle and upper parts of said body and wherein in the region of this join the depth of said groove gradually decreases so that said rear wall of said groove merges approximately into the shape of said upper part.

5. The container according to claim 3 , wherein each groove extends as far as the join between said middle and lower parts of said body and wherein in the region of this join the depth of said groove gradually decreases so that said rear wall of said groove merges approximately into the shape of said lower part.

6. The container according to claim 3 , wherein each groove extends as far as the join between said middle and lower parts of said body, wherein in the region of this join the depth of said groove gradually decreases so that said rear wall of said groove merges approximately into the shape of said lower part, and wherein each groove extends into said lower part of said body, with said rear wall of said groove merging into the shape of said lower part.

7. The container according to claim 3 , in which said lower part of said body meets a bottom of said container,

wherein each groove extends as far as the join between said middle and lower parts of said body,

wherein in the region of this join the depth of said groove gradually decreases so that said rear wall of said groove merges approximately into the shape of said lower part,

wherein each groove extends into said lower part of said body, with said rear wall of said groove merging into the shape of said lower part, and

wherein said groove extends as far as said bottom of said container so as to form a reinforcing rib for said container bottom, with said rear wall of groove then having a reversed curvature with its concavity being directed outwards.

8. The container according to claim 1 , wherein the thermoplastic material is PET.

9. The container according to claim 1 , wherein each edge is configured so that the edge elastically deforms when the faces of the body are subjected to a force acting radially towards the interior.

10. The container according to claim 1 , wherein each edge is configured so that the edge pivots, open outs and flattens elastically when the faces of the body are subjected to a force acting radially towards the interior.

11. The container according to claim 1 , wherein each side end of each groove adjoins an end of a corresponding one of the faces.

12. The container according to claim 1 , wherein each groove is delimited in a circumferential direction of the container by two of the faces such that at least portions of each groove near where the groove adjoins the two faces are disposed radially inward of two faces.