Novel transparent polyurethane polyureas for lamination of glazing materials

• US 4,174,240 A
• Filed: 09/29/1978
• Issued: 11/13/1979
• Est. Priority Date: 10/01/1976
• Status: Expired due to Term

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Quiring, Bernd, Muller, Hanns P., Wagner, Kuno, Oberkirch, Wolfgang
• Primary Examiner(s): Robinson, Ellis P.
• Application Number:
  US05/947,222
• Time in Patent Office: 410 Days
• Field of Search: 156/99, 156/106, 156/331, 428/339, 428/332, 428/412, 428/424, 428/425, 428/426, 428/522, 428/532, 260/75 NH, 260/77.5 AM, 528/64
• US Class Current: 156/99
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/1077 containing polyurethane
• CPC Class Codes: B32B 17/10825 Isostatic pressing, i.e. using non rigid pressure-exerting members against rigid parts
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/3228 acyclic
• CPC Class Codes: C08G 18/3234 cycloaliphatic
• CPC Class Codes: C08G 18/75 cycloaliphatic
• CPC Class Codes: F41H 5/0407 Transparent bullet-proof laminatesinformative reference: layered products essentially comprising glass in general B32B17/06, e.g. B32B17/10009; manufacture or composition of glass, e.g. joining glass to glass C03; permanent multiple-glazing windows, e.g. with spacing therebetween, E06B3/66
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/263 Coating layer not in excess of 5 mils thick or equivalent
• CPC Class Codes: Y10T 428/269 including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/31576 Ester monomer type [polyvinylacetate, etc.]
• CPC Class Codes: Y10T 428/31601 Quartz or glass

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° 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 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.

Claims

1. A process for the production of laminates, wherein sheets of silicate glass and/or transparent glass-like plastics are coated and/or bonded together with a transparent film of 0.1 to 5 mm. in thickness formed from a polyurethane polyurea with a predominantly linear molecular structure exclusively containing aliphatically or cycloaliphatically bound urethane and urea segments and having a shear modulus G'"'"' (DIN 53 445) which amounts to between 2 and 140 N/mm² at 20°

C. and does not fall below a value of 1 N/mm² at 60°

C., characterized by

(a) a content of urea groups --NH--CO--NH-- amounting to between 1 and 20% by weight and

(b) a content of lateral carboxyl groups --COOH directly attached to the main chain of the molecule amounting to between 0.001 and 10% by weight.

2. A process for the production of laminates of glass or glass like transparent plastics with polyurethane polyurea comprising subjecting a transparent film of 0.1 to 5 mm in thickness formed from a polyurethane polyurea comprising the reaction product of

(a) dihydroxy compounds having molecular weights between about 300 and 6,000 selected from the group consisting of polyesters and polyethers,

(b) dihydroxy carboxylic acids corresponding to the formula ##STR4## wherein R represents H, or a C₁ to C₄ alkyl radical, (c) optionally aliphatic or cycloaliphatic diols having molecular weights of between about 62 and 300,

(d) diisocyanates having exclusively aliphatically and cycloaliphatically bound isocyanate groups, and

(e) organic diamines containing aliphatically and cycloaliphatically bound primary amino groups and having molecular weights between about 60 and 3,000, wherein the equivalent ratio of d:

(a+b+c) is between about 1.1;

1 and 4;

1, the equivalent ratio of e;

(a+b+c) is between about 0.1;

1 and 3;

1, the molar ratio of a;

b is between about 1;

0.01 and 1;

12, and the molar ratio of a;

c is between about 1;

0 and 1;

10, said polyurethane polyurea having

(1) a molecular weight greater than about 10,000,

(2) a urea group content of between about 1 and 20 wt. %, and

(3) a content of lateral carboxyl groups directly attached to the main chain of the molecule of between about 0.001 and 10 wt. %

and at least one immediately adjacent sheet of a glass or glass like plastic to heat and pressure.