Polyacetal Resin Composition

8:

• A method of producing a polyacetal resin composition according to claim 1, comprising melt-kneading:
• (a) 100 parts by mass of a polyacetal resin,
• (b) 1 to 150 parts by mass of fine cellulose fibers having a fiber diameter of 2 to 1000 nm,
• (c) 0.1 to 100 parts by mass of polyethylene glycol,
• (d) 0.01 to 3 parts by mass of a hindered phenolic antioxidant, and
• (e) 0.01 to 3 parts by mass of at least one nitrogen-containing compound selected from the group consisting of aminotriazine compounds, guanamine compounds, hydrazide compounds, and polyamides.

13:

• An article, comprising a first member and a second member which are configured so as to be slidable relative to each other, wherein
• the first member is composed of a first resin composition,
• the second member is composed of a second resin composition,
• each of the first resin composition and the second resin composition comprises:
• (a) 100 parts by mass of a polyacetal resin,
• (b) 1 to 150 parts by mass of fine cellulose fibers having a fiber diameter of 2 to 1000 nm, and
• (c) 0.1 to 100 parts by mass of polyethylene glycol, and
• a ratio (A2/A1) of a content ratio (A2) of the fine cellulose fibers in the second resin composition to a content ratio (A1) of the fine cellulose fibers in the first resin composition is 0.5 or more and 1 or less.

16:

• The article according to claim 13, wherein an ethylene ratio R (%), which is a ratio of a number of oxyethylene units to a total number of oxymethylene units and oxyethylene units of the (a) polyacetal resin, and a number of oxyethylene repeating units n of the (c) polyethylene glycol satisfy the relationship of the following formula:
• (
• R
• +
• 0
• .5
• )
• /
• 0.015
• ≤
• n
• ≤
• (
• R
• +
• 10
• )
• /
• 0.01
• 5
• .

20:

• A method of producing the article according to claim 13, the method comprising:
• a step of molding a first resin composition, which is a molten mixture of a first mixed component comprising a polyacetal resin, fine cellulose fibers, and polyethylene glycol, to obtain the first member, and
• a step of molding a second resin composition, which is a molten mixture of a second mixed component comprising a polyacetal resin, fine cellulose fibers, and polyethylene glycol, to obtain the second member, wherein
• the first mixed component and/or the second mixed component comprise a recycled material, which is a melt-processed product of the first member and/or the second member.

31:

• A cellulose fiber-containing powder for a polyacetal resin composition, the cellulose fiber-containing powder comprising:
• (b) fine cellulose fibers having a fiber diameter of 2 to 1000 nm, and
• (c) polyethylene glycol, wherein
• the (c) polyethylene glycol is polyethylene glycol in which an ethylene ratio R (%), which is a ratio of a number of oxyethylene units to a total number of oxymethylene units and oxyethylene units of a polyacetal resin comprised in the polyacetal resin composition, and a number of oxyethylene repeating units n of the (c) polyethylene glycol satisfy the relationship of the following formula:
• (
• R
• +
• 0
• .5
• )
• /
• 0.015
• ≤
• n
• ≤
• (
• R
• +
• 10
• )
• /
• 0.01
• 5
• .

33:

• A method of producing a polyacetal resin composition, the method comprising:
• a powder preparation step for obtaining a cellulose fiber-containing powder according to claim 31, and
• a resin composition preparation step of mixing the cellulose fiber-containing powder and (a) a polyacetal resin to obtain a polyacetal resin composition, wherein
• the (a) polyacetal resin is selected such that an ethylene ratio R (%), which is a ratio of a number of oxyethylene units to a total number of oxymethylene units and oxyethylene units of the (a) polyacetal resin, and a number of oxyethylene repeating units n of the (c) polyethylene glycol satisfy the relationship of the following formula:
• (
• R
• +
• 0
• .5
• )
• /
• 0.015
• ≤
• n
• ≤
• (
• R
• +
• 10
• )
• /
• 0.01
• 5
• .