Sulfur-containing fuel contact body provided with molded article including polyacetal resin composition having increased acid resistance

Patent metadata

Field	Value
Publication number	US-10072147-B2
Application number	US-201615149952-A
Country	US
Kind code	B2
Filing date	May 9, 2016
Priority date	Apr 25, 2014
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A polyacetal resin composition makes it possible, when formed into a molded article, to minimize deterioration during contact with sulfur-containing fuel or an acidic detergent. The polyacetal resin composition contains (A) 100 parts by weight of polyacetal resin, (B) 0.1-1.0 parts by weight of hindered phenolic antioxidant, (C) 0.1-2.0 parts by weight of alkaline earth metal oxide, (D) 0.5-3.0 parts by weight of polyalkylene glycol, and (E) 0.01-1.0 parts by weight of polyvalent fatty acid full ester. This polyacetal resin composition minimizes reductions in the weight of a molded article even after the molded article has been immersed in sulfur-containing fuel.

First claim

What is claimed is:

1. A polyacetal resin composition comprising consisting of:
(A) 100 parts by mass of a polyacetal resin,
(B) 0.1 to 1.0 parts by mass of a hindered phenolic antioxidant,
(C) 0.1 to 2.0 parts by mass of an alkaline earth metal oxide,
(D) 0.5 to 3.0 parts by mass of a polyalkylene glycol,
(E) 0.01 to 1.0 parts by mass of a polyvalent fatty acid ester with an esterification rate of 80% or more.

2. The polyacetal resin composition according to claim 1 , wherein the (A) polyacetal resin is a polyacetal copolymer resin.

3. The polyacetal resin composition according to claim 2 , wherein the polyacetal copolymer resin is a copolymer with a cyclic oligomer of formaldehyde as a main monomer, and a compound selected from a cyclic formal and/or a cyclic ether having at least one carbon-carbon bond as a comonomer.

4. The polyacetal resin composition according to claim 1 , wherein the (C) alkaline earth metal oxide is magnesium oxide.

5. The polyacetal resin composition according to claim 1 , wherein the polyvalent fatty acid ester is an ester compound of a polyvalent alcohol with a carbon number of 3 or more, and a fatty acid.

6. A fuel contact body provided with a molded article of the polyacetal resin composition according to claim 1 .

7. A method of maintaining an exterior surface of a molded article formed of the polyacetal resin composition according to claim 1 , comprising:
exposing said molded article to an acidic component, whereby the molded article exhibits reduced deterioration relative to a polyacetal resin composition lacking any of components (C), (D) or (E) exposed to the acidic component under the same conditions.

8. The method according to claim 7 , wherein the acidic component is a sulfur-containing fuel derivative and/or an acidic detergent derivative.

Assignees

• Polyplastics Co

Inventors

• Shimoda Akihide
• Nakada Satomi
• Miyamoto Yasumitsu
• Kondo Hidemi

Classifications

• C08K2003/222

  Magnesia, i.e. magnesium oxide · CPC title

• C08J7/14

  with acids, their salts or anhydrides · CPC title

• F02M2200/9015

  Elastomeric or plastic materials · CPC title

• C08L71/02

  Polyalkylene oxides · CPC title

• C08J2359/02

  Copolyoxymethylenes · CPC title