Solutions-mothers highly concentrated polymer has original oil-based vegetable and / or animal for the preparation of compositions bitumen / polymer

The present invention relates to a stock solution free of oil of petroleum origin comprising at least one oil of vegetable origin and / or animal origin, at least 20% by weight polymer, based on the weight of the stock solution, with or without at least one crosslinking agent. This stock solution highly concentrated in polymer is stable and does not gel and thus can be diluted and used for preparing bitumen / crosslinked polymer and the asphalt.