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Molding polyamide composition
| Details |
Inventors: Sakashita, Takeshi; Hashimoto, Hidehiko; Nakano, Takayuki;
Assignee: Mitsui Petrochemical Industries, Ltd. (Tokyo, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
Disclosed is a molding reinforced polyamide composition comprising [A] a polyamide selected from a polyamide composed of (a) aromatic dicarboxylic acid component units comprising 60 to 77 mole % of terephthalic acid component units and 23 to 40 mole % of aromatic dicarboxylic acid component units other than terephthalic acid component units and (b) 1,6-diaminohexane units and a polyamide composed of (a) aromatic dicarboxylic acid component units comprising 60 to 100 mole % of terephthalic acid component units and 0 to 40 mole % of aromatic dicarboxylic acid component units other than terephthalic acid component units and (b) units of a linear aliphatic alkylene-diamine component having 7 to 18 carbon atoms, and [B] a filler in an amount of 0.5 to 200 parts by weight per 100 parts by weight of said polyamide. This composition has excellent heat resistance characteristics, mechanical properties, chemical and physical properties and molding characteristics in combination. |
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DETAILED DESCRIPTION OF THE INVENTION The polyamide [A] incorporated as the resin component in the molding reinforced polyamide composition of the present invention is selected from a polyamide composed of (a) aromatic dicarboxylic acid component units comprising 60 to 77 mole% of terephthalic acid component units and 23 to 40 mole% of aromatic dicarboxylic acid components other than terephthalic acid component units and (b) 1,6-diaminohexane units and a polyamide composed of (a) aromatic dicarboxylic acid component units comprising 60 to 100 mole% of terephthalic acid component units and 0 to 40 mole% of aromatic dicarboxylic acid component units other than terephthalic acid component units and (b) units of a linear aliphatic alkylene-diamine component having 7 to 18 carbon atoms.
The intrinsic viscosity (.
eta.
) of the polyamide of this type is not particularly critical and a polyamide insoluble in concentrated sulfuric acid may be used, but it is preferred that the intrinsic viscosity (.
eta.
) of the polyamide as measured in concentrated sulfuric acid be 0.
5 to 3.
0 dl/g, particularly 0.
5 to 2.
8 dl/g, especially particularly 0.
6 to 2.
5 dl/g.
As the aromatic dicarboxylic acid component units (a) constituting the polyamide [A] of the molding reinforced polyamide composition of the present invention, there can be mentioned units of terephthalic acid, isophthalic acid, phthalic acid, 2-methylterephthalic acid and naphthalene-dicarboxylic acid.
In the case where the alkylene-diamine component (b) is 1,6-diaminohexane, in view of the heat moldability or the tensile strength, flexural strength or impact resistance of the final molded article, it is important that the aromatic dicarboxylic acid component units (a) should comprise 60 to 77 mole%, especially 65 to 75 mole%, of terephthalic acid component units and 23 to 40 mole%, especially 25 to 35 mole%, of aromatic dicarboxylic acid component units other than terephthalic acid component units.
More specifically, if the content of the terephthalic acid component units in the polyamide exceeds 77 mole%, the melting point of the polyamide is increased and the difference between the thermal decomposition-initiating temperature and the melting point becomes small and is less than 30
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Adhesives and Rubbers 
