The present invention relates to a polysiloxane-polylactide block copolymer and a preparation method thereof, in which the polysiloxane-polylactide block copolymer has improved impact resistance and flexibility, compared to the conventional polylactide resins and can be prepared by ring-opening polymerization of lactide monomers in the presence of a polymerization initiator of polysiloxane. Also provided are a process for manufacturing the food product and use of a pH responsive hydrogel to provide an enhanced feeling of satiety to a person consuming the hydrogel andor to aid adherence to a weight loss or weight control plan. The calculation clusters are preferably determined from a hierarchical model of the service by dividing the hierarchy in a manner that separates shared service components from the service components that share them, and that separates service components related by 1-to-n and n-to-1 relationships. The window receives a removal tool designed to remove the cover from the jack module. The inflatable portion includes an inner layer and an outer layer attached together, wherein the inner layer is provided immediately adjacent to the perimeter of the curtain portion and wherein the outer layer is provided around at least a part of an outer perimeter of the inner layer, thereby providing two distinct inflatable areas.