Acrylic Resin Films and Process for Producing the Same
First Claim
1. An acrylic resin film made of a material mainly composed of a mixture consisting of 50 to 95 parts by mass of an acrylic resin (A) containing glutaric anhydride units, each represented by the following formula (1), and 5 to 50 parts by mass of acrylic elastic particles (B), with the total amount of the acrylic resin (A) and the acrylic elastic particles (B) as 100 parts by mass, and satisfying the following (i) to (v):
- (i) the acrylic resin (A) consists of 50 to 90 parts by mass of methyl methacrylate units and 10 to 50 parts by mass of glutaric anhydride units with the amount of the entire acrylic resin (A) as 100 parts by mass;
(ii) the total light transmittance is 91% or more;
(iii) the haze value is 1.5% or less;
(iv) the folding endurance value (times) is 20 or more;
(v) the heat shrinkage rate in at least either the longitudinal direction or the transverse direction is less than 5% in a heat shrinkage test;
(where R1 and R2 denote, each independently, a hydrogen atom or alkyl group with 1 to 5 carbon atoms.)
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Abstract
An acrylic resin film, in which acrylic elastic particles are mixed with an acrylic resin containing glutaric anhydride units, has a total light transmittance of 91% or more, a haze value of 1.5% or less, a folding endurance value (times) of 20 or more, and a heat shrinkage rate of less than 5% at least in either the machine direction or the transverse direction in a heat shrinkage test.
66 Citations
16 Claims
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1. An acrylic resin film made of a material mainly composed of a mixture consisting of 50 to 95 parts by mass of an acrylic resin (A) containing glutaric anhydride units, each represented by the following formula (1), and 5 to 50 parts by mass of acrylic elastic particles (B), with the total amount of the acrylic resin (A) and the acrylic elastic particles (B) as 100 parts by mass, and satisfying the following (i) to (v):
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(i) the acrylic resin (A) consists of 50 to 90 parts by mass of methyl methacrylate units and 10 to 50 parts by mass of glutaric anhydride units with the amount of the entire acrylic resin (A) as 100 parts by mass;
(ii) the total light transmittance is 91% or more;
(iii) the haze value is 1.5% or less;
(iv) the folding endurance value (times) is 20 or more;
(v) the heat shrinkage rate in at least either the longitudinal direction or the transverse direction is less than 5% in a heat shrinkage test;
(where R1 and R2 denote, each independently, a hydrogen atom or alkyl group with 1 to 5 carbon atoms.) - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for producing an acrylic resin film, comprising the step of stretching a substantially unstretched acrylic resin film at a temperature in a range from the glass transition temperature (Tg) to {the glass transition temperature (Tg)+50°
- C.} to 1.1 to 5.0 times in the longitudinal direction and in the transverse direction.
Specification