Abstract: This disclosure is concerned with an improved process of treating keratin-containing fiber materials with aqueous solutions of polyisocyanate bisulphite adducts to improve their resistance to felting and shrinkage. The material is pretreated with an aqueous bath containing both a compound carrying a cationic group and the salt of a polyvalent metal or the material is pretreated with just the cationic compound but the polyvalent metal salt is present in the aqueous bath used to apply the bisulphite adduct.

Abstract: A system for conveying molded bricks known as briquettes from a press to a bed plate wherein the briquettes are each conveyed by a plurality of spaced parallel belts to above a conveyor which carries the bed plates under the briquettes supported by the conveyor belts. An inclined substantially coplanar conveyance track which includes elongated rollers has its after portion periodically raised whereby the rollers located in the after portion penetrate upwardly between the belts carrying the briquettes thus lifting the briquettes from the belt. A removal mechanism pushes the briquettes down the rollers of the conveyance track onto a removal plate which pivots with the conveyance track and extends therefrom at a slight incline, the briquettes being received by the main conveyor carrying the bed plates whereby the briquettes are pushed over the conveyance track and onto the bed plate.

Abstract: A simple and economical one-step process for felt-proofing and dimensionally stabilizing textiles, particularly textiles based on keratinous fibers is disclosed. In the process, the textiles are treated with aqueous baths which contain salts of sulfurous acid or pyrosulphites as reducing agents and polyurethanes which contain onium groups.

Abstract: An aqueous solution of bisulphite blocked polyisocyanate prepolymers is imparted improved storage stability at temperatures up to about 45.degree. C by incorporation of about 0.5 to 20% by weight (based on the weight of bisulphite blocked prepolymer) of an aromatic or alkyl aromatic sulphonic acid of the formula:R(SO.sub.3 H).sub.nwherein R is an aromatic or alkyl aromatic hydrocarbon group having 6 to 15 carbon atoms and n is an integer from 1 to 3. The solution may also contain up to 80 volume percent (based on the total quantity of solvent) of an organic solvent miscible with water and having a boiling point below about 150.degree.C. This solution may be used to finish paper, leather or textiles and to shrink proof keratin containing textiles.