Flexible plastic film with polyurethane foam backing prodn. - by pretreating film, before foam prodn., with an aq. dispersion of film-forming polyurethane to repair any damage due to processing

摘要

A process is claimed for the prodn. of moulded prods. (I) consisting of a preformed film made of flexible plastic (II), backed with a layer of polyurethane foam (III); the novelty is that any faults in the film produced during mfr. or further processing are repaired before the foaming process by treatment with an aq. dispersion of film-forming polyurethane (IV). Specifically (IV) is derived from (a) 1 mol. (NCO) di- or poly-isocyanate, (b) 0.1-0.8 mol. (OH) di- or poly-hydric alcohol with mol. wt. 400-6000, (c) 0.05-0.5 mol. (OH and/or NHR) of a cpd. contg. OH and/or NHR gps. together with ionic gp(s)., (d) 0-0.5 mol. (OH) di- or polyhydric alcohol with mol. wt. 62-400, (e) 0-0.4 mol. (NHR) di- or poly-amine with prim. or sec. amino gps. (with R = H, 2-4C alkyl or a moiety contg. the gp. NHR), (f) 0-0.4 mol. (OH + NHR) aminoalcohol with prim. and/or sec. amino gp(s). and (g) 0-0.2 mol. (OH) monohydric polyether-alcohol, such that total OH and/or NHR gps in components (b)-(g) = 0.9-1.2 mol.; (b) is a poly-THF, present as an alpha, omega-diol, and (c) is 2,2-bis-(hydroxymethyl)-propionic acid. USE/ADVANTAGE - The process is useful, e.g. in the prodn. of seats, arm rests, instruments panels, interior linings, etc. for motor vehicles and aircraft; the process makes it possible to use substrate film (II) which has been damaged (e.g. during deep-drawing, processing by the powder-slush method, etc.), by repairing the damage as above.