A draw solute for the forward osmosis membrane process comprises a random copolymer obtainable by random addition of a monomer containing ethylene oxide and butylene oxide to a compound having one or more hydroxyl groups.

The present invention relates to a composition for adhesion of dissimilar materials, and a preparation method therefor, and, more specifically, to a composition for adhesion of dissimilar materials, and a preparation method therefor, the composition comprising, in a specific weight ratio, a (meth)acrylic monomer, an epoxy resin, an epoxy curing accelerator, a thermal polymerization initiator, a polymerization inhibitor and a (meth)acrylic-modified polyurethane component, which comprises a hydrophilic (meth)acrylic-modified polyurethane and a lipophilic (meth)acrylic-modified polyurethane, and having excellent oil resistance while enabling high adhesiveness to be implemented between dissimilar materials at room temperature and high temperatures.

A process for producing a polyol block copolymer in a multiple reactor system including a first and second reactor in which a first reaction takes place in the first reactor and a second reaction takes place in the second reactor. The first reaction is the reaction of a carbonate catalyst with CO.sub.2 and epoxide, in the presence of starter and/or solvent to produce polycarbonate polyol copolymer and the second reaction is the reaction of DMC catalyst with the polycarbonate polyol compound of the first reaction and epoxide to produce polyol block copolymer. The product of the first reaction is fed into the second as crude reaction mixture, the epoxide and the polycarbonate polyol compound of the first reaction are fed in a continuous or semi-batch manner, and/or the product of the first reaction has neutral or alkaline pH on addition to the second. The invention further relates to the copolymers and products incorporating such copolymers.