A resin composition according to an exemplary embodiment of the present disclosure includes a first polyol represented by Chemical Formula 1, a second polyol represented by Chemical Formula 2, and a polyisocyanate, wherein the first polyol and the second polyol have a linear structure without a side chain.

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each of Y.sub.1 to Y.sub.4 is H or OH—, at least one of Y.sub.1 and Y.sub.2 is OH—, at least one of Y.sub.3 and Y.sub.4 is OH—, each of X.sub.1 to X.sub.3 is independently a C.sub.1-C.sub.20 alkyl group, the alkyl group includes or does not include an unsaturated bond, —CH.sub.2— in the alkyl group may be substituted or unsubstituted with —CHOH—, and each of n and m is independently 1 to 200.

A resin composition according to an exemplary embodiment of the present disclosure includes a first polyol represented by Chemical Formula 1, a second polyol represented by Chemical Formula 2, and a polyisocyanate, wherein the first polyol and the second polyol have a linear structure without a side chain.

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each of Y.sub.1 to Y.sub.4 is H or OH—, at least one of Y.sub.1 and Y.sub.2 is OH—, at least one of Y.sub.3 and Y.sub.4 is OH—, each of X.sub.1 to X.sub.3 is independently a C.sub.1-C.sub.20 alkyl group, the alkyl group includes or does not include an unsaturated bond, —CH.sub.2— in the alkyl group may be substituted or unsubstituted with —CHOH—, and each of n and m is independently 1 to 200.

A resin composition according to an exemplary embodiment of the present disclosure includes a first polyol represented by Chemical Formula 1, a second polyol represented by Chemical Formula 2, and a polyisocyanate, wherein the first polyol and the second polyol have a linear structure without a side chain.

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each of Y.sub.1 to Y.sub.4 is H or OH—, at least one of Y.sub.1 and Y.sub.2 is OH—, at least one of Y.sub.3 and Y.sub.4 is OH—, each of X.sub.1 to X.sub.3 is independently a C.sub.1-C.sub.20 alkyl group, the alkyl group includes or does not include an unsaturated bond, —CH.sub.2— in the alkyl group may be substituted or unsubstituted with —CHOH—, and each of n and m is independently 1 to 200.

A polymer composition that contains an aromatic polymer in combination with a tribological formulation is provided. The polymer composition may exhibit a low degree of surface friction that minimizes the extent to which a skin layer is peeled off during use of a part containing the composition (e.g., in a camera module). For example, the polymer composition may exhibit a dynamic coefficient of friction of about 1.0 or less and/or a wear depth may be about 500 micrometers or less as determined in accordance with VDA 230-206:2007.

A bio-resin composition, a bio-resin composite, and a bio-foam material are provided. The bio-resin composition includes a polymer matrix, a toughener, and an antistatic agent. The weight ratio of the polymer matrix to the toughener is between 90:10 and 60:40. Based on the total weight of the polymer matrix and the toughener, the content of the antistatic agent is between 1% and 10%.

A bio-resin composition, a bio-resin composite, and a bio-foam material are provided. The bio-resin composition includes a polymer matrix, a toughener, and an antistatic agent. The weight ratio of the polymer matrix to the toughener is between 90:10 and 60:40. Based on the total weight of the polymer matrix and the toughener, the content of the antistatic agent is between 1% and 10%.

Described herein is a liquid electrostatic ink developer assembly comprising a developer roller having a surface coating, the surface coating comprising a polyurethane resin formed from a polyol; a hydroxyl-terminated polysiloxane; and a polyisocyanate. Also, described herein is a liquid electrostatic printing apparatus comprising the liquid electrostatic ink developer assembly.

Described herein is a liquid electrostatic ink developer assembly comprising a developer roller having a surface coating, the surface coating comprising a polyurethane resin formed from a polyol; a hydroxyl-terminated polysiloxane; and a polyisocyanate. Also, described herein is a liquid electrostatic printing apparatus comprising the liquid electrostatic ink developer assembly.

A polymer composition that contains an aromatic polymer in combination with a tribological formulation is provided. The polymer composition may exhibit a low degree of surface friction that minimizes the extent to which a skin layer is peeled off during use of a part containing the composition (e.g., in a camera module). For example, the polymer composition may exhibit a dynamic coefficient of friction of about 1.0 or less and/or a wear depth may be about 500 micrometers or less as determined in accordance with VDA 230-206:2007.

A shoe cover comprises a shoe cover upper and a shoe cover sole. A shoe cover opening is provided at the top of the shoe cover upper, and the shoe cover opening is provided with a first elastic ring. The shoe cover sole is connected with the bottom of the shoe cover upper. A second elastic ring is provided at where the shoe cover upper connects the shoe cover sole. The second elastic ring straps the shoe cover upper and the shoe cover sole onto either a foot or a shoe, prevents the shoe cover from falling off, and facilitates the shoe cover upper and the shoe cover sole in affixing onto the foot or shoe.