Black colored reinforced polyamide resin composition

Details Black colored reinforced polyamide resin composition Black colored reinforced polyamide resin composition

1999-06-02

2001-07-24

Woodward, Ana (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C252S502000, C252S510000, C524S447000, C524S449000, C524S451000, C524S456000, C524S538000

Reexamination Certificate

active

06265472

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a black colored reinforced polyamide resin composition which renders possible production of molding articles that show excellent initial appearance (surface gloss), have mechanical properties substitutive for metals and hardly cause fading of black color under working conditions in the field, particularly where they are exposed to rain.
BACKGROUND OF THE INVENTION
Since polyamide resins have excellent mechanical and thermal properties and oil resistance, they are broadly used in various parts of, for example, automobiles and electric and electronic products. Also, since reinforced polyamide resins in which the polyamide is blended with an inorganic filler such as glass fiber show remarkably improved properties such as mechanical characteristics, heat resistance and chemical resistance, it becomes possible to use them as substitutes for certain parts conventionally made of metals, for the reasons, for example, of the weight reduction of products and rationalization of production steps, so that such resins have been positively studied in recent years.
Particularly, they are frequently used in the form of black colored molding articles in the case of their use in outdoor applications. Because of this, blending of carbon black is employed as a means to obtain black colored molding articles most inexpensively while easily improving weather resistance.
However, it is known that compositions prepared by merely blending polyamide with carbon black have many problems.
For example, it has been reported that certain problems such as reduction in toughness could occur in products obtained from a composition in which polyamide containing no inorganic filler was blended with carbon black. As a means for solving such problems, several techniques in which a specific dyestuff is jointly used with carbon black have been disclosed. For example, a composition for molding use in which a polyamide resin is blended with carbon black and nigrosine (JP-B-60-43379; the term “JP-B” as used herein means an “examined Japanese patent publication) and a method in which a thermoplastic resin containing nylon is colored by blending it with carbon black and a specific copper-phthalocyanine dyestuff (JP-B-6-35540, JP-B-6-35541) have been reported.
However, these disclosed techniques do not suggest or disclose about a method for improving surface appearance of molding articles when an inorganic filler is blended, or a method for inhibiting fading of black color in rain-accompanying weather resistance test. These problems concerning appearance and weather resistance occur in many cases, particularly when polyamide contains an inorganic filler in a relatively high concentration.
On the other hand, it has been reported that certain problems such as remarkably reduced surface gloss of produced molding articles occur when polyamide containing an inorganic filler is blended with carbon black. As a means for resolving such problems, the use of a resin composition in which polyamide containing glass fiber and carbon black is further blended with nigrosine has been disclosed (JP-A-4-370148; the term “JP-A” as used herein means an “unexamined published Japanese patent application”).
However, according to the studies carried out by the inventors of the present invention, countless cracks were formed on the surface of molding articles when these molding articles were obtained by the disclosed method and subjected to rain-accompanying weather resistance test. In addition, exposure of glass fibers to the surface was marked particularly when the glass fiber content was relatively high, so that their use in the field could cause serious problems.
As described above, the conventional techniques do not suggest or disclose a black colored reinforced polyamide resin composition having such properties that molding articles obtained therefrom show excellent surface appearance, have mechanical characteristics substitutive for metals and hardly cause fading of black color under working conditions in the field, particularly where they are exposed to rain.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a black colored reinforced polyamide resin composition which can be made into molding articles that hardly cause fading of black color under working conditions in the field, particularly where they are exposed to rain, and also have excellent appearances.
Other objects and effects of the present invention will become apparent from the following description.
In order to accomplish the above-described objects, the present inventors made extensive studies. As a result, the inventors found that a black colored reinforced polyamide resin composition which renders possible production of molding articles that hardly cause fading of black color under working conditions in the field, particularly where they are exposed to rain, and also have excellent appearances, can be obtained by black-coloring an inorganic filler-reinforced polyamide resin through blending with specific amounts of carbon black and a specific copper-phthalocyanine derivative. The present invention has been accomplished on the basis of this finding.
That is, the above-described objectives of the present invention have been achieved by providing the following black colored reinforced polyamide resin compositions.
1) A black colored reinforced polyamide resin composition which comprises the following components (A) to (D):
(A) a polyamide;
(B) at least one inorganic filler selected from glass fiber, mica, talc, kaolin and wollastonite;
(C) a carbon black; and
(D) at least one copper-phthalocyanine derivative represented by the following general formula (I) and (II):
CuPc-(—X—NR
1
R
2
)
n
  (I)
CuPc-(—SO
2
—NR
3
R
4
)
n
  (II)
 wherein CuPc represents a substituted or unsubstituted copper-phthalocyanine residue, X represents —CH2—, —CH
2
—CH
2
—, COO—C
2
H
4
— or —CH
2
—CH
2
—COO—C
3
H
6
—, R
1
, R
2
and R
3
each independently represents a hydrogen atom, an unsubstituted alkyl group, a substituted alkyl group, a cycloalkyl group, an alkylaryl group, an aryl group, an alkoxyalkyl group or a heterocyclic residue, R
4
represents an alkylaryl group, an aryl group, an alkoxyalkyl group or a heterocyclic residue, wherein R
1
and R
2
or R
3
and R
4
may be bonded to each other to form a substituted or unsubstituted heterocyclic ring, and n is from 1 to 4 on the average,
wherein the composition contains: from 30 to 70 parts by weight of (A); from 70 to 30 parts by weight of (B); from 0.05 to 10 parts by weight of (C) based on 100 parts by weight of the total weight of (A) and (B); and from 5 to 100 parts by weight of (D) based on 100 parts by weight of (C).
2) The black colored reinforced polyamide resin composition according to the above 1), wherein the blending amount of the copper-phthalocyanine derivative (D) is from 0.1 to 8 parts by weight based on 100 parts by weight of the inorganic filler (B).
3) The black colored reinforced polyamide resin composition according to the above 1), wherein the polyamide (A) is a polyamide which comprises:
(a1) from 85 to 100% by weight of a semi-aromatic polyamide having a crystallization temperature of not higher than 210° C. and containing an aromatic ring in its monomer constituting unit; and
(a2) from 0 to 15% by weight of an aliphatic polyamide having a crystallization temperature of not higher than 210° C.
4) The black colored reinforced polyamide resin composition according to the above 3), wherein the polyamide (a1) is a semi-aromatic polyamide comprises:
from 70 to 95% by weight of a hexamethylene adipamide unit obtained from adipic acid and hexamethylenediamine; and
from 5 to 30% by weight of a hexamethylene isophthalamide unit obtained from isophthalic acid and hexamethylenediamine.
5) The black colored reinforced polyamide resin composition according to the above 1), wherein component (B) is glass fiber having an average fiber diameter of from 15 to 30 &mgr;m.
6) The black colored reinforced polyamide resin composition

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