Abstract: In one aspect, this invention is a polyurethane foam which is the reaction product of a reaction mixture comprising a poly(alkylene carbonate) polyol, a silicone surfactant, a blowing agent, and a polyisocyanate.In another aspect, this invention is an active hydrogen-containing composition comprising a poly(alkylene carbonate) polyol having an equivalent weight from about 100 to about 3000, a blowing agent and a silicone surfactant.

Abstract: A nestable, open-top container has a cover formed of two separate, co-planar pieces, each covering one-half of the open top. Each cover piece is hingedly connected to one side of the upper edge of the container and extends toward and overlaps the opposite side, that is, the side to which the other cover piece is hinged. The cover pieces' adjacent edges engage each other and their remote edges overlap and are supported upon their adjacent container upper edge portions. Each cover piece may be slid sidewise upon its hinge so that it can be spaced from the container upper edge portion which it otherwise overlaps wherein it can be swung either inside or outside of the container. When the cover pieces are arranged in co-planar covering positions, a number of boxes can be stacked, and when they are swung outwardly or inwardly of the container, the boxes may be nested.

Abstract: A container is formed of a rigid, flat base, a rigid cover, and four vertically arranged, flat wall forming panels that are connected together along their adjacent vertical edges by hinge-like corner connectors and whose upper and lower edges are removably held in corresponding grooves formed in the base and cover. The panels are made of plastic extruded into parallel, spaced apart rigid sheets that are interconnected by numerous, spaced apart, transverse strips whose opposite ends are integral with the sheets. Each corner has a flat, sheet-like base strip that is integrally formed with a flexible center and rigid opposite edge sections that extend along the length of the connector base. Each of the opposite edge sections has an integral T-shaped rib extending along its length. The ribs are inserted endwise into elongated vertical slots formed in the endmost strips of the adjacent panel edges for fastening the connectors to the panels.