Patent ID: 6770374
Filing Date: 2004-08-03
Classification: B32B,B63B,C08G,E01D,Y10T

Abstract:
A composite element having the following layer structure:(i) 2-20 mm of metal, (ii) 10-100 mm of compact polyisocyanate products comprising the reaction product of (a) a mixture of at least one polyphenylpolymethylene polyisocyanate and at least one isomer of diphenylmethane diisocyanate with (b) polyether polyalcohols, optionally in the presence of (c) catalysts and/or (d) auxiliaries and/or additives, (iii) 2-20 mm of metal, and wherein layer (ii) has a modulus of elasticity of >275 MPa in the temperature range from 45 to +50Â° C., an adhesion to layers (i) and (iii) of >4 MPa, an elongation of >30% in the temperature range from âˆ’45 to +50Â° C., a tensile strength of >20 MPa and a compressive strength of >20 MPa and wherein component (b) comprises: (b1) from 40 to 99% by weight of polyether polyalcohol having a mean functionality of from 1.5 to 2.99 and a mean molecular weight of from 400 to 8000, and (b2) from 1 to 60% by %weight of polyether polyalcohol having a mean functionality of from 3 to 5 and a mean molecular weight of from 150 to 8000.