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US 11,634,576 B2Granted
Polyacetal resin composition
AssigneePolyplastics Co., Ltd.
InventorsHiroki Arai, Tomohiro Monma
Life of this patent
Estimating the term…
Abstract
A polyacetal resin composition capable of minimizing degradation when a molded body thereof comes into contact with an acidic cleaner. The polyacetal resin composition contains with respect to (A) 100 parts by mass of a polyacetal copolymer in which the amount of a hemiformal end group is 0.8 mmol/kg or less, (B) more than 1.0 parts by mass and at most 5.0 parts by mass of a hindered phenol-based antioxidant, and (C) more than 4.0 parts by mass and at most 30 parts by mass of magnesium oxide.
Claims6
A polyacetal resin composition, comprising:
- (A) a polyacetal copolymer in an amount of 100 parts by mass, wherein the polyacetal copolymer (A) has a hemiformal end group content of 0.2-0.8 mmol/kg,
- (B) a hindered phenol-based antioxidant selected from the group consisting of compound (B-1) Tetrakis[methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate methane and compound (B-2) Triethylene glycol bis(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate in an amount of 1.1 parts by mass or more and 2.0 parts by mass or less,
- (C) magnesium oxide in an amount of 6.0 parts by mass or more and 15 parts by mass or less, and
- (D) polyethylene glycol in an amount of 2.0 part by mass or more and 5.0 parts by mass or less,
- wherein a BET specific surface area of magnesium oxide ranges from 100 to 155 m2/g, and an average particle diameter of magnesium oxide is 7.0 μm or less,
- wherein a number average molecular weight of the polyethylene glycol is 1000 or more and less than 9300.
3 more elements
Dependencies are inferred from the claim text.