Novel transparent polyurethane polyurea films for lamination of

Details Novel transparent polyurethane polyurea films for lamination of Novel transparent polyurethane polyurea films for lamination of

1978-09-29

1981-03-03

Lowe, James B.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

264176R, 264204, 264216, 428339, 4284256, 528 64, 528 65, 528 68, 528 76, 528 80, B32B 1710, C08G 1832, B29D 702

Patent

active

042541760

ABSTRACT:
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 molecular weight diols, optionally low molecular weight diols, dihydroxy carboxylic acids, diisocyanates with only aliphatically and cycloaliphatically bound isocyanates and organic diamines having aliphatically and cycloaliphatically bound primary amino groups. It has specified contents of carboxyl groups and urea groups, and it has a minimum shear modulus at both 20.degree. and 60.degree. 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 polymers by extrusion and solution casting, the production of laminates with glass and glasslike plastics and the laminates so produced. The solution cast or extruded films can be laminated to these substrates by the application of heat and pressure.

REFERENCES:
patent: 3412054 (1968-11-01), Milligan et al.
patent: 3640924 (1972-02-01), Hermann et al.
patent: 3658939 (1972-04-01), Carpenter et al.
patent: 3963679 (1976-06-01), Ullrich et al.

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