PMMA film featuring particularly great weather resistance and great UV protection
View Patent ↗The invention relates to a novel UV-protective and weather-resistant package for surface protecting films for polyvinyl chloride window profiles made of poly(meth)acrylate. Matrix plastics having great molecular weights are used in order to obtain great weather resistance of the surface protecting films.
1. A poly(meth)acrylate film, comprising:
1a) an impact-modified transparent poly(meth)acrylate plastic and
1b) a mixture comprising a UV stabilizer and a UV absorber,
wherein the impact-modified transparent poly(meth)acrylate plastic comprises from greater than 30% to 60% by weight of a poly(meth)acrylate matrix and 70% to 40% by weight of elastomer particles.
2. The film of claim 1 , wherein the elastomer particles have an average particle diameter from 10 to 150 nm.
3. The film of claim 1 , wherein the elastomer particles are distributed in the poly(meth)acrylate matrix and have a core with a soft elastomer phase and a hard phase bonded thereto.
4. The film of claim 1 , wherein the matrix is composed of from 80% by weight to 100% by weight of free-radical-polymerized methyl methacrylate units and from 0% by weight to 20% by weight of other comonomers capable of free-radical polymerization.
5. The film of claim 4 , wherein the matrix is composed of from 90% by weight to 99.5% by weight of free-radical-polymerized methyl methacrylate units and from 0.5% by weight to 12% by weight of other comonomers capable of free-radical polymerization.
6. The film of claim 4 , wherein the other comonomers capable of free-radical polymerization are C 1 -C 4 -alkyl (meth)acrylates.
7. The film of claim 6 , wherein the C 1 -C 4 -alkyl (meth)acrylates are selected from the group consisting of methyl acrylate, ethyl acrylate and butyl acrylate.
8. The film of claim 1 , wherein the average molar mass M W (weight-average) of the matrix is from 80 000 g/mol to 200 000 g/mol.
9. The film of claim 1 , wherein the average molar mass M W (weight-average) of the matrix is from 100 000 g/mol to 180 000 g/mol.
10. The film of claim 1 , wherein the matrix has an average molar mass M W (weight-average) of from 108 000 g/mol to 180 000 g/mol.
11. The film of claim 1 , wherein the poly(meth)acrylate matrix is composed of 85% by weight to 99.5% by weight of methyl methacrylate and from 0.5% by weight to 15% by weight of C 1 -to C 4 -alkyl (meth)acrylates.
12. The film of claim 1 , wherein the poly(meth)acrylate matrix is composed of 90% by weight to 99.5% by weight of methyl methacrylate and from 0.5% by weight to 10% by weight of methyl acrylate.
13. The plastics film according to claim 1 , wherein the mixture comprising a UV stabilizer and a UV absorber comprises:
a UV absorber of benzotriazole type in an amount of from 0.1% by weight to 10% by weight,
a UV absorber of triazine type in an amount of from 0.0% by weight to 5% by weight and
a HALS compound in an amount of from 0.0% by weight to 5% by weight.
14. The plastics film according to claim 1 , wherein the mixture comprising a UV stabilizer and a UV absorber comprises:
a UV absorber of benzotriazole type in an amount of from 0.2% by weight to 6% by weight,
a UV absorber of triazine type in an amount of from 0.2% by weight to 3% by weight and
a HALS compound in an amount of from 0.1% by weight to 3% by weight.
15. The plastics film according to claim 1 , wherein the mixture comprising a UV stabilizer and a UV absorber comprises:
a UV absorber of benzotriazole type in an amount of from 0.5% by weight to 4% by weight,
a UV absorber of triazine type in an amount of from 0.5% by weight to 3% by weight and
a HALS compounds in an amount of from 0.2% by weight to 2% by weight.
16. A method of making the poly(meth)acrylate film of claim 1 , comprising combining 1a) and 1b).