Polyacetal resin composition

Patent metadata

Field	Value
Publication number	US-10844191-B2
Application number	US-201816487679-A
Country	US
Kind code	B2
Filing date	Feb 23, 2018
Priority date	Mar 31, 2017
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

The present invention addresses the problem of providing a polyacetal resin composition which can minimize degradation of a molded product produced from the acetal resin composition, when the molded product is in contact with an acidic cleaner. Said problem is solved by a polyacetal resin composition, comprising: polyacetal copolymer (A) in an amount of 100 parts by mass, wherein said polyacetal copolymer (A) has a hemiformal terminal group content of 0.8 mmol/kg or less; hindered phenol-based antioxidant (B) in an amount of 0.1 to 1.0 part by mass; and at least one selected from an oxide of magnesium or zinc or a hydroxide of magnesium or zinc (C) in an amount more than 2.0 parts by mass and 30 parts by mass or less.

First claim

The invention claimed is:

1. A polyacetal resin composition, comprising:
a polyacetal copolymer (A) in an amount of 100 parts by mass, wherein the polyacetal copolymer (A) has a hemiformal terminal group content of 0.8 mmol/kg or less;
a hindered phenol-based antioxidant (B) in an amount of 0.1 to 1.0 part by mass; and
an oxide of magnesium (C) in an amount more than 2.0 parts by mass and 30 parts by mass or less, wherein a BET specific surface area of the magnesium oxide is 100 m 2 /g or more.

2. The polyacetal resin composition according to claim 1 , comprising 0.5 to 3.0 parts by mass of polyalkylene glycol (D).

3. An automotive part comprising a molded product of the polyacetal resin composition according to claim 1 .

4. A method for preparing an automotive part having acid resistance against an acid component, comprising placing the polyacetal resin composition according to claim 1 into a mold and polymerizing the composition such that the composition takes the shape of the automotive part.

5. The method according to claim 4 , wherein the acid component is derived from an acidic cleaner.

Assignees

• Polyplastics Co

Inventors

• Arai Hiroki
• Monma Tomohiro

Classifications

• C08L2201/08

  Stabilised against heat, light or radiation or oxydation · CPC title

• C08L71/02

  Polyalkylene oxides · CPC title

• C08L59/00

  Compositions of polyacetals; Compositions of derivatives of polyacetals (of polyvinyl acetals C08L29/14) · CPC title

• C08K2201/006

  Additives being defined by their surface area · CPC title

• C08K2003/222

  Magnesia, i.e. magnesium oxide · CPC title