Co-extruded impact-modified PMMA film

Patent metadata

Field	Value
Publication number	US-9987828-B2
Application number	US-201314382695-A
Country	US
Kind code	B2
Filing date	Apr 12, 2013
Priority date	Apr 27, 2012
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

The present invention relates to novel matt PMMA foils for application on materials as foil providing protection from weathering effects and as decorative foil. In particular, the present invention relates to a novel, at least two-layer PMMA foil which features particularly good adhesion on the substrate. The outer layer here exhibits the mattness, and the inner layer here comprises a low-molecular-weight component which improves adhesion on the substrate.

First claim

The invention claimed is:

1. A PMMA foil, comprising:
an outer layer which comprises a PMMA matrix material, and
an inner layer which comprises the PMMA matrix material, and from 5.0 to 18% by weight of an oligomeric PMMA with a weight-average molar mass of from 300 to 1500 g/mol, measured by SEC against a PMMA standard,
wherein at least one of said inner and outer layers comprises an impact modifier.

2. The PMMA foil according to claim 1 , wherein the outer layer further comprises from 0.5 to 20% by weight of one or more matting agents.

3. The PMMA foil according to claim 2 , wherein the matting agent comprises SiO x particles, TiO 2 particles, BaSO 4 particles, BaCO 3 particles, or crosslinked polymer particles, and the particles have a diameter of from 1 to 40 μm.

4. The PMMA foil according to claim 3 , wherein the matting agent comprises crosslinked polymer particles, which comprise PMMA particles or silicone particles.

5. The PMMA foil according to claim 1 , wherein the inner layer further comprises from 0.01 to 0.5% by weight of one or more antiblocking agents.

6. The PMMA foil according to claim 5 , wherein the antiblocking agent comprises SiO x particles, TiO x particles, BaSO 4 particles, BaCO 3 particles, crosslinked PMMA particles, or crosslinked silicone particles, and the particles have a diameter of from 0.5 μm to 40 μm.

7. The PMMA foil according to claim 1 , wherein both the outer and inner layers comprise an impact modifier.

8. The PMMA foil according to claim 1 , wherein the impact modifier comprises core-shell particles or core-shell-shell particles, and at least one shell comprises a poly(meth)acrylate.

9. The PMMA foil according to claim 1 , wherein the PMMA matrix material is obtained through polymerization of a composition comprising from 80 to 100% by weight of methyl methacrylate and from 0 to 20% by weight of one or more other ethylenically unsaturated monomers capable of free-radical polymerization.

10. The PMMA foil according to claim 1 , wherein the outer layer further comprises from 2.0 to 12% by weight of one or more matting agents.

11. The PMMA foil according to claim 3 , wherein the particles in the matting agent have a diameter of from 1.5 to 20 μm.

12. The PMMA foil according to claim 1 , wherein the inner layer and/or the outer layer further comprises an HALS compound, a triazine, and/or a benzotriazole.

13. The PMMA foil according to claim 1 , wherein a thickness of the inner layer is from 2 to 100 μm, and a thickness of the outer layer is from 2 to 100 μm.

14. The PMMA foil according to claim 1 , further comprising:
on the outer layer, a third layer with a thickness of from 2 to 100 μm.

15. The PMMA foil according to claim 14 , wherein the third layer comprises a scratch-resistant PMMA layer, a PVDF layer, a PMMA/PVDF layer or a decorative layer.

16. A method for coating an article, said method comprising:
securely bonding the PMMA foil according to claim 1 to the article by lamination and/or adhesive bonding.

17. The method according to claim 16 , wherein the article comprises plastic.

18. The PMMA foil according to claim 1 , wherein the oligomeric PMMA has the same composition as the PMMA matrix material.

Assignees

• Guenanten Claude
• Enders Michael
• Doessel Lukas Friedrich
• Postert Karsten
• Stoerkle Dominic
• Evonik Roehm Gmbh

Inventors

• Guenanten Claude
• Enders Michael
• Doessel Lukas Friedrich
• Postert Karsten
• Stoerkle Dominic

Classifications

• B32B2333/12

  Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate · CPC title

• Y10T428/256

  Heavy metal or aluminum or compound thereof · CPC title

• Y10T428/24975

  No layer or component greater than 5 mils thick · CPC title

• Y10T156/10

  Methods of surface bonding and/or assembly therefor · CPC title

• B32B27/308 Primary

  comprising acrylic (co)polymers · CPC title