# US 11,299,618 B2 · Polyacetal resin composition and article molded therefrom

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- Number: US 11,299,618 B2
- Document ID: US11299618B2
- Status: Granted
- Kind: B2
- Application number: 15/531,568
- Filed: 2015-12-15
- Published: 2017-11-16
- Granted: 2022-04-12
- Earliest claimed: 2014-12-22
- Assignees: Mitsubishi Gas Chemical Company, Inc.; Thai Polyacetal Co., Ltd.
- Applicants: Mitsubishi Gas Chemical Company, Inc.; Thai Polyacetal Co., Ltd.
- Inventors: Yumi Okui; Daisuke Kobayashi; Akira Ito; Daisuke Sunaga; Yupin Pattamamongkolchai; Sanit Palaharn
- Web page: https://patentgrep.com/patent/US11299618B2

## CPC

- C08L 59/04: Copolyoxymethylenes
- C08K 3/22: of metals
- C08K 5/17: Amines; Quaternary ammonium compounds
- C08K 5/3435: Piperidines
- C08L 77/00: Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers
- C08K 2003/2296: {of zinc}
- C08L 2201/08: Stabilised against heat, light or radiation or oxydation
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The present invention provides a polyacetal resin composition comprising (A) a polyacetal resin and (B) zinc oxide, wherein the content of oxyalkylene constituent units other than an oxymethylene group in the polyacetal resin (A) is 0.1% by mass or more, and wherein the total surface area of the zinc oxide (B) in the polyacetal resin composition is 0.1 to 40 m2 per 100 g of the polyacetal resin (A); as well as an article molded therefrom.

## Claims

### Claim 1

A polyacetal resin composition comprising:
(A) a polyacetal resin and (B) zinc oxide, wherein the content of oxyalkylene constituent units other than an oxymethylene group in the polyacetal resin (A) is 0.1% by mass or more, wherein the total surface area of the zinc oxide (B) in the polyacetal resin composition is 0.1 to 40 m2 per 100 g of the polyacetal resin (A), and wherein the zinc oxide (B) has a BET specific surface area of 0.1 to 9 m2/g, and
wherein the polyacetal resin composition contains 0.01 to 3.0 parts by mass of (E) at least one compound selected from the group consisting of a carbodiimide compound and an oxazoline compound, relative to 100 parts by mass of the polyacetal resin (A).

### Claim 2 (depends on 1)

The polyacetal resin composition according to claim 1, wherein the content of the oxyalkylene constituent units other than an oxymethylene group in the polyacetal resin (A) is 0.1% to 10.0% by mass.

### Claim 3 (depends on 1)

The polyacetal resin composition according to claim 1, wherein the zinc oxide (B) has a pH of 6 to 8, as measured in accordance with JIS K 5101-17-1.

### Claim 4 (depends on 1)

The polyacetal resin composition according to claim 1, wherein the polyacetal resin composition contains 0.01 to 3.0 parts by mass of (C) a polyamide resin, relative to 100 parts by mass of the polyacetal resin (A).

### Claim 5 (depends on 1)

The polyacetal resin composition according to claim 1, wherein the polyacetal resin composition contains 0.01 to 3.0 parts by mass of (D) a hindered amine compound, relative to 100 parts by mass of the polyacetal resin (A).