Laminated safety glass with polyurethane film

• US 4,241,140 A
• Filed: 04/12/1978
• Issued: 12/23/1980
• Est. Priority Date: 04/12/1978
• Status: Expired due to Term

• Current Assignee: PPG Industries Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Incorporated (Nouryon BV)
• Inventors: Ammons, Vernon G.
• Primary Examiner(s): Ball, Michael W.
• Application Number:
  US05/895,693
• Time in Patent Office: 986 Days
• Field of Search: 156/99, 156/102, 156/242, 156/106, 156/246, 156/331, 428/426, 428/424, 428/425, 428/225, 528/76, 528/81, 528/78, 264/298, 264/301, 264/261
• US Class Current: 428/339
• CPC Class Codes: B32B 17/1077 containing polyurethane
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: C08G 18/4018 Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
• CPC Class Codes: C08G 18/6607 with compounds of group C08G18/3203
• CPC Class Codes: C08G 18/7621 being toluene diisocyanate including isomer mixtures
• CPC Class Codes: C09J 175/04 Polyurethanes
• CPC Class Codes: Y10T 428/269 including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/31601 Quartz or glass

Abstract

A transparent, elastomeric polyurethane useful as an interlayer in safety glass laminates is prepared by the reaction of an aromatic diisocyanate with a mixture of a polyalkylene ether glycol, a polycaprolactone triol, and a monomeric aliphatic diol.

Claims

1. A method for making a laminated glass article comprising the steps of:

a. casting into a sheet mold a single curable polyurethane reaction mixture which comprises;

(1) a polytetramethylene ether glycol having a molecular weight from about 400 to about 2000,

(2) a polycaprolactone triol having a molecular weight from about 300 to 1000;

(3) a monomeric aliphatic diol having from 4 to 6 carbon atoms; and

(4) an isomeric mixture of 2,4-toluene diisocyanate and 2,6-toluene diisocyanate;

b. polymerizing the reaction mixture to form a self-supporting polyurethane sheet;

c. removing the self-supporting polyurethane sheet from said mold;

d. laminating said polyurethane sheet to a sheet of glass; and

e. curing the polyurethane.

2. The method according to claim 1, wherein the reaction mixture comprises:

a. a polytetramethylene ether glycol having a molecular weight of about 1000;

b. a polycaprolactone triol having a molecular weight of about 300;

c. 1,4-butane diol; and

d. an isomeric mixture of 2,4-toluene diisocyanate and at least about 35 percent 2,6-toluene diisocyanate.

3. The method according to claim 1, wherein the step of laminating the self-supporting polyurethane sheet to a sheet of glass is performed prior to curing the polyurethane.

4. The method according to claim 1 wherein the step of laminating the self-supporting sheet to a sheet of glass is performed subsequent to curing the polyurethane.

5. The method according to claim 3 or claim 4 wherein the polyurethane sheet is laminated between glass sheets at a temperature of about 300°

F. (about 149°

C.) and a pressure of about 200 pounds per square inch.

6. The method according to claim 5, wherein the thickness of the polyurethane sheet is from 20 to 60 mils (about 0.5 to 1.5 millimeters).

7. An article prepared according to the method of claim 6.