Laminated glass comprising interlayer film layers with a pigmented frame

Patent metadata

Field	Value
Publication number	US-11396160-B2
Application number	US-201816641838-A
Country	US
Kind code	B2
Filing date	Aug 1, 2018
Priority date	Aug 25, 2017
Publication date	Jul 26, 2022
Grant date	Jul 26, 2022

Abstract

Laminated glass having an opaque frame area is obtained by laminating at least one film A containing polyvinyl acetal PA and optionally at least one plasticiser WA and at least one film B containing a polyvinyl acetal PB and at least one plasticiser WB between two glass sheets, wherein prior to laminationthe amount of plasticiser WA in film A is less than 22% by weightthe amount of plasticiser WB in film B is at least 22% by weight andfilm A comprises at least on one surface a non-transparent region.

First claim

The invention claimed is:

1. A laminated glass windshield, side window, or sunroof produced by laminating two glass sheets with a multilayer laminating film comprising at least one film A containing a polyvinyl acetal PA and optionally one or more plasticisers WA and at least one film B containing a polyvinyl acetal PB and one or more plasticisers WB, wherein prior to lamination:
the amount of plasticiser WA in film A is less than 8% by weight
the amount of plasticiser WB in film B is at least 22% by weight,
film A comprises on at least one surface, a non-transparent region, and
film A contains 117-780 ppm potassium acetate based on the weight of film A, and 0-20 ppm magnesium acetate based on the weight of film A.

2. The laminated glass of claim 1 , wherein the non-transparent region is located on film A in a band having a width of 0.5 to 20 cm from at least one edge of the laminated glass.

3. The laminated glass of claim 1 , wherein the non-transparent region is provided by pigments or dyes selected from the group consisting of carbon black, iron oxide and spinel pigments.

4. The laminated glass of claim 1 , wherein the non-transparent region is provided to all edge regions of the laminated glass in shape of a frame.

5. The laminated glass of claim 1 , wherein film A comprises 0-20 ppm alkaline earth metal ions.

6. The laminated glass of claim 1 , wherein the ratio of alkali ions to alkaline earth metal ions in ppm in film A is at least 20.

7. The laminated glass of claim 1 , wherein film A comprises a polyvinyl acetal PA with a proportion of vinyl alcohol groups from 6 to 26% by weight.

8. The laminated glass of claim 1 , wherein film B comprises a polyvinyl acetal B with a proportion of vinyl alcohol groups from 14 to 26% by weight.

9. The laminated glass of claim 1 , wherein the film B has a wedge-shaped thickness profile.

10. The laminated glass of claim 1 , wherein at least one of the glass sheets has a thickness of less than 1.8 mm.

11. A method for producing a laminated glass of claim 1 , comprising: providing the film A on at least on one surface thereof with a non-transparent region, positioning the film A on a first glass sheet, covering the film A by at least one film B, and covering an outermost film B by a second glass sheet, and laminating at temperatures over 100° C.

12. The method for producing a laminated glass of claim 11 , wherein the non-transparent region is provided by coating a suspension of pigments or dyes selected from the group consisting of carbon black, iron oxide, spinel pigments, and mixtures thereof in a carrier liquid on the surface of film A.

13. The method for producing a laminated glass of claim 11 , wherein the non-transparent region is fixed on the surface of film A by subjecting the coated film to a temperature which is at least 3° C. below the Tg of film A.

14. The laminated glass of claim 1 , wherein the content of plasticizer WA in film A is from 0 to 4 wt. % based on the weight of film A.

15. The laminated glass of claim 1 , wherein film A contains no plasticizer.

Assignees

• Kuraray Europe Gmbh

Inventors

• Butler Charles
• Keller Uwe
• Steinbach Niklas
• Fuss Robert

Classifications

• B32B17/10651 Primary

  comprising colorants, e.g. dyes or pigments · CPC title

• B32B27/22

  using plasticisers · CPC title

• B32B17/1066

  imparting a tint in certain regions only, i.e. shade band · CPC title

• B32B17/10036 Primary

  comprising two outer glass sheets · CPC title

• B32B2605/08

  Cars · CPC title