Acrylic multilayered film with high weather resistance, and preparation method thereof

Patent metadata

Field	Value
Publication number	US-10737472-B2
Application number	US-201314427464-A
Country	US
Kind code	B2
Filing date	Sep 9, 2013
Priority date	Sep 12, 2012
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

Provided is an acrylic multilayered film with high weather resistance, comprising an upper film and a lower film, wherein the upper film comprises a polyvinylidene fluoride and a first acrylic copolymer containing a first functional group, and the lower film comprises an acrylic thermoplastic resin and a second acrylic copolymer containing a second functional group.

First claim

The invention claimed is:

1. A highly weather resistant acrylic multilayer film comprising:
an upper film; and
a lower film,
wherein
the upper film comprises polyvinylidene fluoride and a first functional group-containing first acrylic copolymer, the first functional group comprises a first epoxy group,
the upper film comprises 60 wt % to 95 wt % of polyvinylidene fluoride and 5 wt % to 40 wt % of the first functional group-containing first acrylic copolymer,
the lower film comprises an acrylic thermoplastic resin and a second functional group-containing second acrylic copolymer, the second functional group comprises a second epoxy group,
the first functional group-containing first acrylic copolymer is formed by copolymerization of a first polymerizable acrylic monomer mixture comprising a first functional group-containing acrylic monomer,
the second functional group-containing second acrylic copolymer is formed by copolymerization of a second polymerizable acrylic monomer mixture comprising a second functional group-containing acrylic monomer,
the first and the second polymerizable acrylic monomer mixtures further independently comprise 5 wt % to 20 wt % of an acrylic monomer and 75 wt % to 94.5 wt % of a methacrylic monomer, and
a weight average molecular weight of the first functional group-containing first acrylic copolymer ranges from 70,000 to 120,000.

2. The acrylic multilayer film according to claim 1 , wherein the first functional group-containing acrylic monomer and the second functional group-containing acrylic monomer are glycidyl methacrylate.

3. The acrylic multilayer film according to claim 1 , wherein the first polymerizable acrylic monomer mixture comprises 0.5 wt % to 5 wt % of the first functional group-containing acrylic monomer and the second polymerizable acrylic monomer mixture comprises 0.5 wt % to 5 wt % of the second functional group-containing acrylic monomer.

4. The acrylic multilayer film according to claim 3 , wherein the first and the second polymerizable acrylic monomer mixtures independently comprise 0.5 wt % to 5.0 wt % of an epoxy methacrylate, 5 wt % to 20 wt % of methyl acrylate, and 75 wt % to 94.5 wt % of methyl methacrylate.

5. The acrylic multilayer film according to claim 1 , wherein the second functional group-containing second acrylic copolymer has a weight average molecular weight of 90,000 to 150,000.

6. The acrylic multilayer film according to claim 1 , wherein the lower film further comprises an impact modifier.

7. The acrylic multilayer film according to claim 6 , wherein the lower film comprises 20 wt % to 50 wt % of the acrylic thermoplastic resin, 40 wt % to 60 wt % of the second functional group-containing second acrylic copolymer, and 10 wt % to 30 wt % of the impact modifier.

8. The acrylic multilayer film according to claim 6 , wherein the impact modifier comprises an acrylic rubber copolymer.

9. The acrylic multilayer film according to claim 6 , wherein the lower film further comprises one additive selected from the group consisting of a UV stabilizer, an antioxidant, a lubricant, and combinations thereof.

10. The acrylic multilayer film according to claim 9 , wherein the lower film comprises 1.5 phr to 5 phr of the UV stabilizer.

11. A method for manufacturing the highly weather resistant acrylic multilayer film according to claim 1 , comprising:
preparing an upper film composition comprising the polyvinylidene fluoride and the first functional group-containing first acrylic copolymer;
preparing a lower film composition comprising the acrylic thermoplastic resin and the second functional group-containing second acrylic copolymer;
coextruding the upper film composition and the lower film composition to prepare the acrylic multilayer film having the upper film and the lower film.

Assignees

• Lg Hausys Ltd

Inventors

• Park Hwan Seok
• Shin Chang Hak
• Yue Seong Hoon
• Lee Jong Hun
• Park Ku Il
• Hwang Deok Ryul
• Song Yea Ri

Classifications

• B32B27/30

  comprising vinyl {(co)polymers; comprising acrylic (co)polymers} · CPC title

• B32B27/08 Primary

  of synthetic resin · CPC title

• C08L33/04

  Homopolymers or copolymers of esters {(C08L43/04 takes precedence)} · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• B29K2105/0005

  containing compounding ingredients (releasing, lubricating or separating agents B29C33/56, fibers B29K2105/08, B29K2105/12; fillers B29K2105/16, recycled material B29K2105/26) · CPC title