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US 5,393,813 AGranted
Polyoxymethylene having improved acid stability
AssigneeDegussa AG
InventorsStephanie Schauhoff, Edwin Nun, Detlef Arnoldi
Life of this patent
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Abstract
By adding melamine cyanurate, polyoxymethylene is stabilized against acid attack, wherein in particular as little as under 3 parts of MCA per 100 parts of POM are effective. The weight loss of a stabilized POM under the action of acid may be less than 3% of that of an unstabilized POM. The product is useful in products which are exposed to acidic agents such as irrigation systems, dishwashers, sanitary installations.
Claims6
A polyoxymethylene composition which has improved acid stability containing
- A at least one polyoxymethylene,
- B 0.05-<3 parts, related to 100 parts of A, of melamine cyanurate together with
- C up to 5 parts, related to 100 parts of A, of an alkali metal salt of a polybasic carboxylic acid and
- D up to 5 parts, related to 100 parts of A, of a polyalkylene glycol,
- E up to 100 parts, related to 100 parts of A, of a thermoplastic polyurethane,
- F customary additives.
3 more elements
An injection molded article containing
- A a polyoxymethylene,
- B 0.05-15 parts, related to 100 parts of component A, of melamine cyanurate.
Dependencies are inferred from the claim text.