Process for the production of composite safety glass

• US 4,952,460 A
• Filed: 06/16/1989
• Issued: 08/28/1990
• Est. Priority Date: 11/05/1975
• Status: Expired due to Fees

• Current Assignee: Dynamit Nobel AG
• Original Assignee: Dynamit Nobel AG
• Inventors: Knackstedt, Wilhelm, Beckmann, Rolf
• Primary Examiner(s): Van Balen, William J.
• Application Number:
  US07/367,912
• Time in Patent Office: 438 Days
• Field of Search: 428/429, 428/441, 428/442, 428/447
• US Class Current: 428/429
• CPC Class Codes: B32B 17/10045 with at least one intermediate layer consisting of a glass sheet
• CPC Class Codes: B32B 17/1055 characterized by the resin layer, i.e. interlayer
• CPC Class Codes: B32B 17/10688 Adjustment of the adherence to the glass layers
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 17/10788 containing ethylene vinylacetate
• CPC Class Codes: B32B 27/306 comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/3163 Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.]
• CPC Class Codes: Y10T 428/31645 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31649 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

An improvement in a method for manufacturing a composite safety glass wherein one or more silicate glass panes is bonded to a plasticized synthetic resin film at an elevated temperature, the improvement residing in employing as the plasticized synthetic resin film a soft film of a polymer of ethylene and/or propylene and effecting the bonding under pressure at a temperature of at least 120° C. and up to 200° C.

Claims

1. A laminated safety glass consisting of

(a) at least one silica glass sheet;

(b) a plasticizer free soft film of a copolymer, said copolymer consisting essentially of ethylene and vinyl acetate, said copolymer having a vinyl acetate content of 8 to 45% by weight, said soft film having a Shore A hardness of 40 to 98, a number average of molecular weight determined in o-dichloro-benzene at 90°

C. in a membrane osmometer between 20,000 and 100,000 melt flow index, as determined according to DIN 53 735, of between 0.1 and 20 g/10 minutes, and

(c) a bonding agent consisting essentially of a functional silane, said functional silane being selected from the group consisting of a silicon-organofunctional silane of the formula ##STR6## wherein R is a hydrolyzable residue, R'"'"' is an alkyl residue of 1-18 carbon atoms;

A is a bivalent alkylene residue of 1-10 carbon atoms which can be branched, and is a residue containing a functional group, which functional group is selected from the group consisting of ##STR7## halogen, NR² R³ and ##STR8## wherein R² is selected from the group consisting of H and an amino alkyl of 2-8 carbon atoms in the alkyl residue; and

R³ is H and R² ; and

R⁴ is selected from the group consisting of H, CH₃ and C₂ H₅ ; and

n is 1 to 3 and p is 0 or 1, and a siliconfunctional silane of the formula

space="preserve" listing-type="equation">R.sub.n.sup.1 --Si--R.sub.4-n

wherein

R'"'"' is identical or different, saturated, unbranched or branched alkyl residues of 1-18 carbon atoms, R is selected from the group consisting of halogen, identical or different saturated alkoxy groups of 1-8 carbon atoms and an acyl residue linked to the Si atom via an oxygen atom, and wherein n is 1 to 3.

2. A laminated safety glass according to claim 1 wherein said silane is a silicon organofunctional silane.

3. A laminated safety glass according to claim 1, wherein said silane is a silicon functional silane.

4. A laminated glass according to claim 1 wherein said plasticizer free soft film is disposed between a pair of silica glass sheets and laminated to said silica glass sheets by said functional silane.

5. A laminated safety glass according to claim 2 wherein said silicon-organofunctional silane is present between the plasticizer free soft film and the silica glass sheet in an amount of 0.0001 to 5 weight percent.

6. A laminated safety glass according to claim 2 wherein said silicon-organofunctional silane is present in an amount of 0.0005 to 2 weight percent.

7. A laminated safety glass according to claim 1 wherein said silane is δ

-glycidyloxypropyltrimethoxysilane.

8. A laminated safety glass according to claim 1 wherein said silane is δ

-imidozolylpropyltriethoxysilane.

9. A laminated safety glass according to claim 1 wherein the functional silane is in a solution and the silane concentration in the solution is 0.0001 to 10 percent by weight.

10. A laminated safety glass according to claim 1 wherein the functional silane is in a solution and the silane concentration in the solution is 0.0005 to 7.0 percent by weight.

11. A laminated safety glass according to claim 1 wherein said silicon-function silane is present in an amount of 0.5 to 7 weight percent.

12. A laminated safety glass according to claim 1 wherein said silicon-function silane is present in an amount of 1 to 5 weight percent.

13. A laminated safety glass according to claim 1 wherein the functional silane is in a varnish and the silane concentration in the varnish is 0.0001 to 7 percent by weight.

14. A laminated safety glass according to claim 1 wherein the silane is in a varnish and the silane concentration in the varnish is 0.0005 to 5 percent by weight.

15. A laminated safety glass according to claim 1 wherein said silicon-organofunctional silane contains epoxy groups and said silane is contained in a varnish, the silane being present in an amount of 0.01 to 5 percent by weight.

16. A laminated safety glass according to claim 1 wherein said silicon-organofunctional silane contains epoxy groups, and said silane is contained in a varnish, the silane being present in an amount of 0.01 to 2 percent by weight.

17. A laminated safety glass according to claim 1 wherein said silicon-organofunctional silane contains amino groups, and said silane is contained in a varnish, the silane being present in an amount of 0.0001 to 2 percent by weight.

18. A laminated safety glass according to claim 1 wherein said silicon-organofunctional silane contains amino groups, and said silane is contained in a varnish, the silane being present in an amount of 0.0005 to 1 percent by weight.