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AssigneeSumitomo Chemical Company, Limited
InventorsSatoshi Okamoto, Manabu Hirakawa
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An object of the present invention is to provide a liquid crystalline polyester resin composition to produce a molded article without generating black foreign materials even if exposed to high temperature. This object is achieved by providing a liquid crystalline polyester resin composition comprising a liquid crystalline polyester and at least one phosphite compound of the formula (I): 1 wherein, R1 represents a hydrogen atom or, an alkyl group having 1 to 4 carbon atoms or a phenyl group, and R2 represents an alkyl group having 1 to 4 carbon atoms or a phenyl group.
A liquid crystalline polyester resin composition comprising a liquid crystalline polyester and at least one phosphite compound of the formula (I):
Dependencies are inferred from the claim text.
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Phosphorus bound to oxygen only: esters of phosphorous acids, e.g. of H3PO3
Use of inorganic or non-macromolecular organic substances as compounding ingredients
Term end not estimated
The present invention relates to a liquid crystalline polyester resin composition.
Liquid crystalline polyesters are widely used in various electric and electronic fields because of excellent electric and mechanical properties and also excellent processability. However, with enlargement and diversification of application, molding process or treatment after molding process sometimes conducted under high temperature conditions, and therefore, high heat resistant stability is desired.
For example, JP No. 4-318058A discloses a liquid crystalline polyester composition containing 2,2-methylenebis (4, 6-di-t-butylphenyl) octyl phosphite as a stabilizer for improving heat resistant stability. However, when this resin composition is made into a molded article or exposed to high temperature during the compounding process with fillers or the molding process, there is a problem of generating black foreign materials in a molded article caused by the decomposition of stabilizer and the increase of the viscosity and the gelation of the liquid crystalline polyester.
The present invention will be illustrated based on the following examples, but it is needless to say that the scope of the present invention is not limited to the examples.
The properties of a liquid crystalline polyester resin were evaluated by the following methods.
Properties of Resin