PVB film with low-migration UV protection

Patent metadata

Field	Value
Publication number	US-9604433-B2
Application number	US-201514688046-A
Country	US
Kind code	B2
Filing date	Apr 16, 2015
Priority date	May 7, 2014
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

Polyvinylacetal films exhibiting high UV absorbance, freedom from cloudiness, and low tendency for UV stabilizer migration use, as a UV absorber, one or more UV absorbers of the formulae (1a), (1b), (2) or (3) in films formed from plasticizer-containing polyvinyl acetal

First claim

What is claimed is:

1. A film, containing at least one polyvinyl acetal, at least one plasticiser and 0.01-1.5% by weight of at least one UV absorber selected from the group consisting of compounds of Formulas (1a), (1b), (2) and (3)

where R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14=H; halogen, or C 1-20 alkyl, C 1-20 hydroxyalkyl, C 1-20 alkoxyalkyl, or C 1-20 acyloxyalkyl groups, in each case optionally substituted by aldehyde, keto or epoxy groups, with the proviso that at least one of the groups R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14 carries a carboxyl, sulfoxy or phosphate group with an alkali metal ion, alkaline earth metal ion, or ammonium ion as a counterion.

2. The film of claim 1 , wherein compounds of Formula (5)

where R1=H or halogen, R2=H or CH 3 , where Me n+ =Li + , Na + , K + , Mg 2+ , Ca 2+ , Zn 2+ , or NH 4 + , and n is the valence of metal Me n+ are used as a UV absorber.

3. The film of claim 1 , wherein the film contains less than 1500 ppm of antioxidants having the partial structure (3,5-di-tert-butyl-4-hydroxyphenyl)propionate or according to formula (6)

where R=a hydrocarbon radical of a polyfunctional alcohol, oligoglycol with 1 to 10 glycol units, a hydrocarbon group with 1 to 20 carbon atoms, an N, P, or S-substituted hydrocarbon group with 1 to 30 carbon atoms, or a carboxylic acid ester group with 1 to 30 carbon atoms in an alcohol group of the ester.

4. The film of claim 2 , wherein the film contains less than 1500 ppm of antioxidants having the partial structure (3,5-di-tert-butyl-4-hydroxyphenyl)propionate or according to formula (6)

where R=a hydrocarbon radical of a polyfunctional alcohol, oligoglycol with 1 to 10 glycol units, a hydrocarbon group with 1 to 20 carbon atoms, an N, P, or S-substituted hydrocarbon group with 1 to 30 carbon atoms, or a carboxylic acid ester group with 1 to 30 carbon atoms in an alcohol group of the ester.

5. The films of claim 1 , wherein the film has a yellowness value db of less than 2, determined on a laminate consisting of the film with a thickness of 0.76 mm between two panes of clear glass having a thickness of 2 mm.

6. The film of claim 1 , wherein the films contain one or more metal ions of Be, Mg, Ca, Sr, Ba, Zn and Al in a proportion of more than 5 ppm.

7. The film of claim 1 , wherein the film comprises at least one sterically hindered amine light stabiliser.

8. The film of claim 1 , wherein the polyvinyl acetal has a polyvinyl alcohol content from 12 to 24% by weight.

9. A laminated glass laminates, comprising at least one film of claim 1 as a laminating film.

10. A museum glazing, display window glazing, motor vehicle glazing, aircraft glazing, photovoltaic modules, light emitting diode or organic light emitting diode screen, television, computer screen, big screen, electrochromic glass element, photochromic glass element, or photoelectrochromic glass element, comprising a laminate containing a film of claim 1 as a laminating film.

11. A method for producing a polyvinyl acetal film of claim 1 , comprising mixing polyvinyl acetal, at least one plasticiser, and at least one UV absorber of Formula 1 in solid form in a mixing apparatus, and subsequently extruding the mixture thus obtained.

12. The method of claim 11 , wherein the UV absorber is fed to the mixing apparatus suspended in a carrier liquid.

Assignees

• Kuraray Europe Gmbh

Inventors

• Lellig Philipp
• Keller Uwe

Classifications

• C08K5/3467

  having more than two nitrogen atoms in the ring · CPC title

• B32B2605/18

  Aircraft · CPC title

• B32B17/10688

  Adjustment of the adherence to the glass layers · CPC title

• B32B2457/12

  Photovoltaic modules · CPC title

• C08J2329/14

  Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols · CPC title