Abstract: The present invention relates to novel novolac resins obtained by coupling at least one aromatic compound (A) comprising at least two hydroxyl groups and at least one aldehyde (B) in the presence of an acid catalyst and in the presence of water and/or an organic solvent, followed by a step of alkylating the coupling resin thus obtained with at least one unconjugated diene (C), preferably containing no indene. These novolac resins are advantageously used in vulcanized and crosslinked elastomeric compositions since their viscosity, which is lower than that of the resins of the prior art, allows them to be handled easily. They are also used as adhesion promoters for improving the adhesion of rubber to reinforcing materials such as organic fibres made in particular of rayon, polyesters, polyamides or aramids, and metal cords made of steel, in particular brass steel or galvanized steel.

Abstract: The invention relates to a coating or composite moulding or mastic composition comprising, by weight: A) 100 parts of at least one reactive or non-reactive organic binder B) 0.001 to 20 parts of at least one additive comprising cellulose microfibrils modified at the surface by at least one compound B1, the said cellulose microfibrils having an aspect ratio l/d of greater than 20 and a mean cross-section d ranging from 1 to 50 nm, the said compound B1 having at least one hydrophilic part and at least one hydrophobic part, the said microfibrils being modified at the surface by physical route, by physical adsorption of the said compound B1 C) optionally, at least one organic diluent D) optionally, up to 300 parts of at least one component chosen from fillers, fibres, pigments, dyes and other conventional additives. The invention also relates to a specific process for the preparation of this composition, to specific uses and to an intermediate composition for the preparation of such a composition.

Abstract: The present invention relates to novel novolac resins obtained by coupling at least one aromatic compound (A) comprising at least two hydroxyl groups and at least one aldehyde (B) in the presence of an acid catalyst and in the presence of water and/or an organic solvent, followed by a step of alkylating the coupling resin thus obtained with at least one unconjugated diene (C), preferably containing no indene. These novolac resins are advantageously used in vulcanized and crosslinked elastomeric compositions since their viscosity, which is lower than that of the resins of the prior art, allows them to be handled easily. They are also used as adhesion promoters for improving the adhesion of rubber to reinforcing materials such as organic fibres made in particular of rayon, polyesters, polyamides or aramids, and metal cords made of steel, in particular brass steel or galvanized steel.

Abstract: The invention relates to a process for the treatment of paper consisting of the application to the paper either of a cationic resin, PAE, and of a latex containing acid functional groups, the resin and the latex being applied simultaneously but separately, or of a stable mixture prepared beforehand containing the PAE and a latex stabilized by a nonionic surfactant.