SUBSTRATES COATED OR BONDED WITH A COMPOSITION COMPRISING A POLYURETHANE

• Main Author: SCHAEKENS, CHRIS FRANCOIS HUBERT
• Format: Patent
• Language: English; French
• Published: 23.06.2016
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS AS ADHESIVES; USE OF MATERIALS THEREFOR; WOODSTAINS

A coated substrate having on one surface thereof a coating composition comprising a polyurethane, said polyurethane comprising the reaction product of: i) at least one isocyanate; and, ii) a polyol having an ABA block copolymer structure in which at least 80 wt.% of each Block A is composed of lactoyl units. Block A of the ABA block copolymer polyol may be composed entirely of lactoyl units and, preferably, each Block A of said polyol has independently from 4 to 16 lactoyl units. The ABA block copolymer polyol may be further characterized by a number average molecular weight (Mn) of from 1000 to 5000, preferably from 1000 to 3500 g/mol. L'invention concerne un substrat revêtu présentant sur l'une de ses surfaces une composition de revêtement comprenant un polyuréthanne, ledit polyuréthanne comprenant le produit de réaction de : i) au moins un isocyanate ; et, ii) un polyol ayant une structure de copolymère séquencé ABA, dans lequel au moins 80 % en poids de chaque séquence A est composé de motifs lactoyle. La séquence A du polyol copolymère séquencé ABA peut être entièrement composée de motifs lactoyle et, de préférence, chaque séquence A dudit polyol a indépendamment de 4 à 16 motifs lactoyle. Le polyol copolymère séquencé ABA peut en outre être caractérisé par un poids moléculaire moyen en nombre (Mn) de 1 000 à 5 000, de préférence de 1 000 à 3 500 g/mole.