Transparent polyurethane polyureas for lamination of glazing...

Details Transparent polyurethane polyureas for lamination of glazing... Transparent polyurethane polyureas for lamination of glazing...

C - Chemistry, Metallurgy

08

G

154/122, 154/140

C08G 18/65 (2006.01) B32B 17/10 (2006.01) C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08G 18/28 (2006.01) C08G 18/71 (2006.01) C08G 18/75 (2006.01)

Patent

CA 1122349

ABSTRACT OF THE DISCLOSURE The present disclosure is concerned with a novel transparent polyurethane polyurea which is particularly suitable for lamination to glass and glasslike transparent plastics. The polymer is the reaction product of high molecu- lar weight diols, optionally low molecular weight diols, dihydroxy carboxylic aclds, diisocyanates with only aliphati- cally and cycloaliphatically bound isocyanates and organic diamines having aliphatically and cycloaliphatically bound primary amino groups. It has specified contents of car- boxyl groups and urea groups, and it has a minimum shear modulus at both 20 and 60°C. The present disclosure is also concerned with a process for synthesizing such polymers. A preferred method is to react the diisocyanate and hydroxyl bearing compounds to prepare an isocyanate terminated prepolymer and chain extend with the diamine. Also discussed are the production of film from these polymera by extrusion and solution casting, the pro- duction of laminates wlth glass and glasslike plastics and the laminates 80 produced. The solution cast or extruded films can be laminated to these substrates oy the applica- tlon of heat and pressure.

286760

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