Solvent-free two-component polyurethane reactive adhesives and their use for producing sandwich-type interior panelling for vehicles

A method for producing a sandwich structure suitable for interior panelling for vehicles comprising

• (1) coating two or more flat substrates with a solvent-free two-component polyurethane reactive adhesive consisting essentially of
• (A) a polyisocyanate component based on diphenylmethane diisocyanates,
• (B) a polyol component having an overall OH value of 300 to 600, said polyol component being a mixture of
• (B1) 60 to 90 wt. % of difunctional and trifunctional polyethers having an OH value of 28 to 600 obtained by reacting ethylene oxide and/or propylene oxide with glycols and with trihydric alcohols,
• (B2) 0 to 15 wt. % of polyesters possessing OH groups and having an OH value of 200 to 300,
• (B3) 5 to 20 wt. % of glycols having a molecular weight of 62 to 200,
• (B4) 1 to 2 wt. % of water, and
• (B5) 0.5 to 3 wt. % of activators, the quantities of components (B1) to (B5) being relative to the total amount of polyol component and totalling 100 wt. %, and optionally
• (C) additives, wherein component (A) and component (B) are present in proportionate amounts such that the isocyanate index is 120 to 250;
• and
• (2) pressing together the coated flat substrates to produce the sandwich structure.