(Meth)acrylic resin composition, imidized (meth)acrylic resin composition, and film obtained by molding them
View Patent ↗The present invention provides a (meth)acrylic resin composition comprising a carboxylic acid group produced by heating a (meth)acrylic-based resin (C), wherein the (meth)acrylic-based resin (C) is obtained by polymerizing a monomer mixture (A) containing 80 to 99 wt % of a linear alkyl (meth)acrylate and 1 to 20 wt % of tertiary-butyl (meth)acrylate, in the presence of an acrylic acid ester-based crosslinked elastic particle (B) that is obtained by mixing and polymerizing 0.5 to 5 parts by weight of a polyfunctional monomer having at least two non-conjugated double bonds per molecule, with respect to 100 parts by weight of a monomer mixture containing 50 to 100 wt % of an alkyl acrylate monomer and 0 to 50 wt % of an alkyl methacrylate monomer. This composition can be used to produce a film having excellent chemical resistance (in particular, sun-screening agent resistance).
1. A (meth)acrylic resin composition obtained by heating a resin mixture comprising a (meth)acrylic-based resin (C) and a thermoplastic resin (D),
wherein the (meth)acrylic-based resin (C) is obtained by polymerizing a monomer mixture (A) comprising:
from 80 to 99 wt % of a linear alkyl (meth)acrylate; and
from 1 to 20 wt % of tertiary-butyl (meth)acrylate,
in the presence of an alkyl acrylate-based crosslinked elastic particle (B),
wherein the alkyl acrylate-based crosslinked elastic particle (B) is obtained by mixing and polymerizing from 0.5 to 5 parts by weight of a polyfunctional monomer having at least two non-conjugated double bonds per molecule, with respect to 100 parts by weight of a monomer mixture comprising from 50 to 100 wt % of an alkyl acrylate monomer and from 0 to 50 wt % of an alkyl methacrylate monomer,
wherein an acid value of the (meth)acrylic resin composition is from 0.2 to 0.7 mmol/g.
2. The (meth)acrylic resin composition according to claim 1 , wherein the acid value of the (meth)acrylic resin composition is at least 0.3 mmol/g and lower than 0.7 mmol/g.
3. The (meth)acrylic resin composition according to claim 1 , wherein a melt viscosity of the (meth)acrylic resin composition at 260° C. and 122 sec −1 is not greater than 20000 poise.
4. A film obtained by molding the (meth)acrylic resin composition according to claim 1 .
5. A laminated product obtained by laminating a metal or a plastic with a film obtained by molding the (meth)acrylic resin composition according to claim 1 .
6. The (meth)acrylic resin composition according to claim 1 , wherein the thermoplastic resin (D) has an acid value of lower than 0.7 mmol/g.
7. An imidized (meth)acrylic resin composition obtained by imidizing a (meth)acrylic resin composition obtained by heating a resin mixture comprising a (meth)acrylic-based resin (C) and a thermoplastic resin (D),
wherein the (meth)acrylic-based resin (C) is obtained by polymerizing a monomer mixture (A) comprising:
from 80 to 99 wt % of a linear alkyl (meth)acrylate; and
from 1 to 20 wt % of tertiary-butyl (meth)acrylate,
in the presence of an alkyl acrylate-based crosslinked elastic particle (B),
wherein the alkyl acrylate-based crosslinked elastic particle (B) is obtained by mixing and polymerizing from 0.5 to 5 parts by weight of a polyfunctional monomer having at least two non-conjugated double bonds per molecule, with respect to 100 parts by weight of a monomer mixture comprising from 50 to 100 wt % of an alkyl acrylate monomer and from 0 to 50 wt % of an alkyl methacrylate monomer,
wherein an acid value of the (meth)acrylic resin composition is from 0.2 to 0.7 mmol/g.
8. The imidized (meth)acrylic resin composition according to claim 7 , wherein the thermoplastic resin (D) has an acid value of lower than 0.7 mmol/g.
9. A film obtained by molding an imidized (meth)acrylic resin composition obtained by imidizing a (meth)acrylic resin composition obtained by heating a resin mixture comprising a (meth)acrylic-based resin (C) and a thermoplastic resin (D),
wherein the (meth)acrylic-based resin (C) is obtained by polymerizing a monomer mixture (A) comprising:
from 80 to 99 wt % of a linear alkyl (meth)acrylate; and
from 1 to 20 wt % of tertiary-butyl (meth)acrylate,
in the presence of an alkyl acrylate-based crosslinked elastic particle (B),
wherein the alkyl acrylate-based crosslinked elastic particle (B) is obtained by mixing and polymerizing from 0.5 to 5 parts by weight of a polyfunctional monomer having at least two non-conjugated double bonds per molecule, with respect to 100 parts by weight of a monomer mixture comprising from 50 to 100 wt % of an alkyl acrylate monomer and from 0 to 50 wt % of an alkyl methacrylate monomer,
wherein an acid value of the (meth)acrylic resin composition is from 0.2 to 0.7 mmol/g.
10. The film according to claim 9 , wherein the thermoplastic resin (D) has an acid value of lower than 0.7 mmol/g.
11. A laminated product obtained by laminating a metal or a plastic with a film obtained by molding an imidized (meth)acrylic resin composition obtained by imidizing a (meth)acrylic resin composition obtained by heating a resin mixture comprising a (meth)acrylic-based resin (C) and a thermoplastic resin (D),
wherein the (meth)acrylic-based resin (C) is obtained by polymerizing a monomer mixture (A) comprising:
from 80 to 99 wt % of a linear alkyl (meth)acrylate; and
from 1 to 20 wt % of tertiary-butyl (meth)acrylate,
in the presence of an alkyl acrylate-based crosslinked elastic particle (B),
wherein the alkyl acrylate-based crosslinked elastic particle (B) is obtained by mixing and polymerizing from 0.5 to 5 parts by weight of a polyfunctional monomer having at least two non-conjugated double bonds per molecule, with respect to 100 parts by weight of a monomer mixture comprising from 50 to 100 wt % of an alkyl acrylate monomer and from 0 to 50 wt % of an alkyl methacrylate monomer,
wherein an acid value of the (meth)acrylic resin composition is from 0.2 to 0.7 mmol/g.
12. The laminated product according to claim 11 , wherein the thermoplastic resin (D) has an acid value of lower than 0.7 mmol/g.