METHOD OF MAKING TRANSPARENT LAMINATED STRUCTURE HAVING TRANSPARENT INTERLAYER

• US 3,703,425 A
• Filed: 04/29/1969
• Issued: 11/21/1972
• Est. Priority Date: 04/29/1969
• Status: Expired due to Term

• Current Assignee: Augusto E. Benavides, John Delmonte, Paul L. Meadows
• Original Assignee: Augusto E. Benavides, John Delmonte, Paul L. Meadows
• Inventors: Delmonte, John, Meadows, Paul L., Benavides, Augusto E.
• Application Number:
  US04/820,116
• Time in Patent Office: 1,302 Days
• US Class Current: 264/261
• CPC Class Codes: B29C 39/003 characterised by the choice of material
• CPC Class Codes: B29C 39/126 by casting between two preformed layers, e.g. deformable layers between two glass layers B32B17/10917
• CPC Class Codes: B29C 39/32 with joints or the like for making the mould impervious
• CPC Class Codes: B29C 39/42 Casting under special conditions, e.g. vacuum
• CPC Class Codes: B29K 2075/00 Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2995/0026 Transparent
• CPC Class Codes: B29L 2031/7782 Glazing
• CPC Class Codes: B32B 17/1077 containing polyurethane
• CPC Class Codes: B32B 17/10917 between two pre-positioned glass layers
• CPC Class Codes: Y10T 428/31601 Quartz or glass

Abstract

LAMINATED SHEETS OF GLASS OR RIGID TRANSPARENT SYNTHETIC PLASTIC SHEETS FOR "SAFETY GLASS" PURPOSES ARE MADE BY CASTING THE INTERLAYER BETWEEN THE RIGID SHEETS, USING CERTAIN LIQUID POLYURETHANE PREPOLYMERS, CURABLE AT LOW TEMPERATURES. THE SPECIFIC POLYURETHANES FOR THIS PURPOSE HAVE HIGH ELASTIC PROPERTIES AND STRONG ADHESION TO THE SURFACES OF THE GLASS OR OTHER TRANSPARENT SHEETS, WHICH REDUCES THE HAZARDS OF FLYING PIECES WHEN THE LAMINATE IS BROKEN BY IMPACT. THE CASTING PROCESS HAS ADVANTAGES IN PERMITTING THE SIMULTANEOUS MAKING OF MARGIN GASKETS AND SEALS, AND THE EMBEDMENT OF MECHANICAL OR DECORATIVE PARTS.

Claims