A polarizing plate protective film which prevents deterioration of polarization performance in a high temperature, high humidity environment, and a polarizing plate and display device using the film including a compound represented by the following General Formula (I).

(X-L.sub.nz  General Formula (I)

X represents a formyl group, a boronic acid group, or a group represented by the following General Formula (I-B) or a group represented by the following General Formula (I-C), where L represents a single bond or divalent linking group, and n represents an integer equal to or greater than 2. When n is 2, Z represents a single bond or a divalent group, and when n≧3, Z represents an n-valent group.

##STR00001##

R.sup.A and R.sup.B represent an alkyl group, a cycloalkyl group, an aryl group, or an acyl group. R.sup.A and R.sup.B may be bonded to each other to form a ring. * represents a bond to be bonded to L.

A polarizing plate protective film which prevents deterioration of polarization performance in a high temperature, high humidity environment, and a polarizing plate and display device using the film including a compound represented by the following General Formula (I).

(X-L.sub.nz  General Formula (I)

X represents a formyl group, a boronic acid group, or a group represented by the following General Formula (I-B) or a group represented by the following General Formula (I-C), where L represents a single bond or divalent linking group, and n represents an integer equal to or greater than 2. When n is 2, Z represents a single bond or a divalent group, and when n≧3, Z represents an n-valent group.

##STR00001##

R.sup.A and R.sup.B represent an alkyl group, a cycloalkyl group, an aryl group, or an acyl group. R.sup.A and R.sup.B may be bonded to each other to form a ring. * represents a bond to be bonded to L.

Biodegradable thermoformed articles are disclosed. The thermoformed articles are formed from a biodegradable polymer composition. The polymer composition contains a cellulose ester polymer, a plasticizer, and one or more other additives. Thermoformed articles can be made in accordance with the present disclosure having low haze and high clarity.

Biodegradable thermoformed articles are disclosed. The thermoformed articles are formed from a biodegradable polymer composition. The polymer composition contains a cellulose ester polymer, a plasticizer, and one or more other additives. Thermoformed articles can be made in accordance with the present disclosure having low haze and high clarity.

A method for preparing stably dispersed cellulose nanofibers comprises the following steps: 1) mixing cellulose and an organic solvent, the percentage of the cellulose being 1% to 15% in weight; 2) adding an esterification agent into the resultant mixture of step 1), the molar ratio of the esterification agent to the cellulose being from 1:0.1 to 4; and 3) physically breaking the resultant mixture of step 2) until a suspension liquid with stably dispersed cellulose nanofibers of 2-1000 nm in diameter and 10-100 μm in length is obtained, an esterification reaction of hydroxyl group(s) on the surface of cellulose fibers occurring at the time of the breaking. Also disclosed are dispersed cellulose nanofibers with improved compatibility to the matrix than the untreated cellulose and an improved strength of the composite materials.

A method for preparing stably dispersed cellulose nanofibers comprises the following steps: 1) mixing cellulose and an organic solvent, the percentage of the cellulose being 1% to 15% in weight; 2) adding an esterification agent into the resultant mixture of step 1), the molar ratio of the esterification agent to the cellulose being from 1:0.1 to 4; and 3) physically breaking the resultant mixture of step 2) until a suspension liquid with stably dispersed cellulose nanofibers of 2-1000 nm in diameter and 10-100 μm in length is obtained, an esterification reaction of hydroxyl group(s) on the surface of cellulose fibers occurring at the time of the breaking. Also disclosed are dispersed cellulose nanofibers with improved compatibility to the matrix than the untreated cellulose and an improved strength of the composite materials.

A resin composition includes cellulose nanofibers (A) and a cellulose ester resin (B) having a polymerization degree of 100 to 500 and a substitution degree of 2.1 to 2.6.

A resin composition includes cellulose nanofibers (A) and a cellulose ester resin (B) having a polymerization degree of 100 to 500 and a substitution degree of 2.1 to 2.6.

The invention is an optical film at least containing cellulose acylate and a compound having a structure denoted by General Formula (I) described below, and a polarizing plate and a liquid crystal display device employing the optical film. ##STR00001##
R.sup.1 and R.sup.3 represent a hydrogen atom, an alkyl group, an alkenyl group, a cycloalkyl group, a cycloalkenyl group, or an aryl group, and R.sup.5a and R.sup.5b represent an alkyl group, an alkenyl group, a cycloalkyl group, a cycloalkenyl group, an aryl group, or a heterocyclic group. R.sup.1, R.sup.3, R.sup.5a, and R.sup.5b may have a substituent group.

The invention is an optical film at least containing cellulose acylate and a compound having a structure denoted by General Formula (I) described below, and a polarizing plate and a liquid crystal display device employing the optical film. ##STR00001##
R.sup.1 and R.sup.3 represent a hydrogen atom, an alkyl group, an alkenyl group, a cycloalkyl group, a cycloalkenyl group, or an aryl group, and R.sup.5a and R.sup.5b represent an alkyl group, an alkenyl group, a cycloalkyl group, a cycloalkenyl group, an aryl group, or a heterocyclic group. R.sup.1, R.sup.3, R.sup.5a, and R.sup.5b may have a substituent group.