Glass-polycarbonate laminate

• US 4,204,025 A
• Filed: 11/21/1978
• Issued: 05/20/1980
• Est. Priority Date: 11/21/1978
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: LeGrand, Donald G., Vitale, Gina G.
• Primary Examiner(s): Ansher, Harold
• Application Number:
  US05/962,614
• Time in Patent Office: 546 Days
• Field of Search: 428/412, 428/409, 428/442, 428/447, 428/448, 428/451, 428/518, 428/911, 156/329, 156/332, 156/99, 156/106
• US Class Current: 428/409
• CPC Class Codes: B32B 17/10018 comprising only one glass sheet
• CPC Class Codes: B32B 17/10688 Adjustment of the adherence to the glass layers
• CPC Class Codes: B32B 17/10752 containing polycarbonate
• CPC Class Codes: B32B 2369/00 Polycarbonates
• CPC Class Codes: Y10T 428/31 Surface property or characteristic of web, sheet or block
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31649 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31667 Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product
• CPC Class Codes: Y10T 428/3192 Next to vinyl or vinylidene chloride polymer

Abstract

A glass-polycarbonate laminate wherein a glass layer is bonded to a polycarbonate layer by a bonding system comprised of an organopolysiloxane-polycarbonate block copolymer bonding agent and a polyvinylidine chloride primer, said primer being applied onto either the glass layer or onto said block copolymer.

Claims

1. An improved laminate of glass and polycarbonate resin bonded by means of a first organopolysiloxane-polycarbonate copolymer adhesive layer disposed between the glass layer and the polycarbonate layer, the improvement comprising a second polyvinylidene chloride adhesion promoting layer disposed between said first adhesive layer and said glass layer.

2. The laminate according to claim 1 wherein said organopolysiloxane-polycarbonate copolymer is comprised of (A) from 10 to 75 percent by weight of a polydiorganosiloxane composed of from about 5 to about 200 chemically combined diorganosiloxy units consisting essentially of dialkylsiloxy units which are connected to each other by silicon-oxygen-silicon linkages wherein each of the silicon atoms has two organo radicals attached through a carbon-silicon bond and (B) from 90 to 25 percent by weight of an intercondensation product of a dihydric phenol and a carbonyl halide, where said polydiorganosiloxane and said intercondensation product are joined by aryloxy-silicon linkages.

3. The laminate according to claim 2 wherein said polyvinylidene chloride adhesion promoter is used as a primer on the lamina of glass.

4. The laminate according to claim 1 wherein a plurality of layers of glass are bonded to said resin.

5. The laminate according to claim 3 and further containing a layer of abrasion resistant material bonded to the outer exposed surface of the lamina of polycarbonate resin, said abrasion resistant material being harder than said polycarbonate resin.

6. An improved laminate of glass and polycarbonate resin containing at least one glass lamina bonded to at least one polycarbonate lamina by means of an intermediate bonding layer of an organopolysiloxane polycarbonate copolymer adhesive disposed between said glass lamina and said polycarbonate resin lamina, the improvement comprising an adhesion promoting primer layer of polyvinylidene chloride disposed intermediate said glass lamina and said organopolysiloxane-polycarbonate copolymer layer.

7. A process for forming a polycarbonate-glass laminate comprising the steps of (i) applying composition comprised of a polyvinylidene chloride emulsion to a glass lamina;

(ii) evaporating off the water from said emulsion thereby forming a primer layer on said glass lamina; and

, (iii) adhesively bonding the primed glass lamina to a polycarbonate lamina with an adhesive which comprises an organopolysiloxane-polycarbonate block copolymer.