Bilayer windshield and preformed two-ply sheet for use therein

• US 4,891,271 A
• Filed: 08/25/1988
• Issued: 01/02/1990
• Est. Priority Date: 07/11/1983
• Status: Expired due to Term

• Current Assignee: Saint-Gobain Vitrage
• Original Assignee: Saint-Gobain Vitrage
• Inventors: Daude, Gerard, Colmon, Daniel, Bravet, Jean L., Moncheaux, Michel J.
• Primary Examiner(s): VAN BALEN, WILLIAM
• Application Number:
  US07/236,240
• Time in Patent Office: 495 Days
• Field of Search: 428/423.1, 428/423.3, 428/425.6
• US Class Current: 428/423.1
• CPC Class Codes: B32B 17/10018 comprising only one glass sheet
• CPC Class Codes: B32B 17/1077 containing polyurethane
• CPC Class Codes: B32B 17/10908 in liquid form
• CPC Class Codes: B32B 27/04 as impregnant, bonding, or embedding substance not used
• CPC Class Codes: C08G 18/6607 with compounds of group C08G18/3203
• CPC Class Codes: C08G 18/6611 having at least three hydroxy groups
• CPC Class Codes: C08G 18/6625 with compounds of group C08G18/34
• CPC Class Codes: C08G 18/73 acyclic
• CPC Class Codes: C08G 18/75 cycloaliphatic
• CPC Class Codes: C08G 18/755 and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
• CPC Class Codes: C08G 18/78 Nitrogen C08G18/775, C08G18/776 take precedence
• CPC Class Codes: C08G 18/7825 containing ureum groups
• CPC Class Codes: C08J 2375/08 from polyethers
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31554 Next to second layer of polyamidoester
• CPC Class Codes: Y10T 428/31576 Ester monomer type [polyvinylacetate, etc.]
• CPC Class Codes: Y10T 428/31601 Quartz or glass

Abstract

Preformed, two-ply, optical, energy-absorbing, flexible polyurethane sheet including a self-healing surface and a surface which is adhesive under the influence of heat and pressure; bilayer glazing laminates and bilayer automotive safety windshields including said two-ply sheet; said two-ply sheet comprises a self-healing ply and an energy-absorbing adhesive plyurethane ply which is prepared preferably by reactive-casting on a horizontal support and formed preferably from a polyisocyanate monomer including from about 2 to about 10 wt. % of urea groups.

Claims

1. A preformed flexible multi-ply transparent sheet, effective for use in a bilayer glazing laminate, having optical, moisture-resistant, and energy-absorbent properties effective for use in a bilayer glazing laminate, one ply which comprises a self-healing thermosetting polymeric material, the other ply which comprises an energy-absorbing polyurethane ply which is substantially non-tacky at room temperature but which is capable of being adhesive under the influence of heat and pressure, wherein said sheet is capable of maintaining, in the absence of an adhesion promoter, effective adhesion as measured by the temperature and moisture conditions of ANSI-Z26 test nos. 3 and 4, said energy-absorbing polyurethane being prepared by reactive casting a solvent-free mixture of monomers;

and wherein said multi-ply transparent sheet is produced by;

(1) depositing on a horizontal support a liquid film comprising a solvent-free mixture of monomers capable of forming a thermosetting polymeric material;

(2) forming a solid film of said thermosetting polymeric material by polymerizing the monomers while on said support;

(3) depositing on said supported film a liquid film comprising;

(a) an aliphatic or a cycloaliphatic diisocyanate,

(b) a polyol component including;

(i) about 30 to about 45 OH equivalent percent of a polymeric diol having a molecular weight of about 500 to about 3,000;

(ii) about 20 to about 70 OH equivalent percent of a chain extender diol having a molecular weight of less than about 300, the molar ratio of said polymeric diol (i) to said chain extender diol (ii) being about 0.3;

1 to about 1;

1, and

(iii) about 0.05 to about 35 OH equivalent percent of a polyol having an OH functionality greater than 2, the molar ratio of said polymeric diol (i) to said polyol (iii) being about 1.5;

1 to 4;

1; and

(c) a polyurethane catalyst,

wherein the NCO/OH ratio of said mixture is about 0.8;

1 to about 1;

1;

(4) forming a solid, optical, energy-absorbing overlaid polyurethane ply within about an hour, thereby forming said multi-ply sheets; and

(5) removing said multi-ply sheet from said support.

2. The multi-ply preform sheet according to claim 1, wherein said molar ratio of polymeric diol to chain extender diol is about 0.5:

1 to about 0.8;

1.

3. The multi-ply preform sheet according to claim 1, wherein said polyol mixture includes a triol monomer and the molar ratio of said polymeric diol to said triol is about 1.5:

1 to about 4;

1.