Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2001-03-30
2003-07-22
Buttner, David J. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S316000
Reexamination Certificate
active
06596812
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a thermoplastic resin composition, more particularly, it relates to a thermoplastic resin composition having excellent surface impact strength and moldability and containing a rubber-reinforced resin and an aromatic polycarbonate.
Since ABS resins have many advantageous features such as excellent surface appearance of their molded articles, moldability and mechanical properties, ABS resins have been widely utilized in the fields of electric and electronic apparatus, OA equipment, etc., and the polymer alloys comprising such ABS resins and polycarbonates are used for cellular phones, wheel caps, etc. In recent years, efforts have been made for reducing the thickness of the molded articles for the purpose of realizing their weight reduction, but this has brought to the fore the problem of poor moldability and low practical impact strength (such as surface impact resistance) of the conventional polymer alloys.
As a result of the present inventors' earnest study to solve the above problem, it has been found that a thermoplastic resin composition comprising 20 to 60 parts by weight of a rubber-reinforced resin (A) containing a grafted rubber-like polymer (A1) having a specific particle size distribution and 40 to 80 parts by weight of an aromatic polycarbonate (B) having a weight-average molecular weight of 16,000 to 30,000 is excellent in surface impact strength which serves as an index of practical impact resistance of the molded articles.
The present invention has been attained on the basis of the above finding.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a thermoplastic resin composition having excellent surface impact strength and moldability.
To attain the above aim, in the first aspect of the present invention, there is provided a thermoplastic resin composition comprising 20 to 60 parts by weight of a rubber-reinforced resin (A) and 80 to 40 parts by weight of an aromatic polycarbonate (B) having an average molecular weight of 16,000 to 30,000 ((A)+(B)=100 parts by weight),
said rubber-reinforced resin (A) containing a grafted rubber-like polymer (A1) obtained by polymerizing at least one compound (b) selected from the group consisting of aromatic vinyl compounds, vinyl cyanide compounds, (meth)acrylic ester compounds, acid anhydride monomeric compounds and maleimide-based compounds in the presence of a rubber-like polymer (a) having a glass transition temperature of not more than −40° C.,
the content of the rubber-like polymer (a) in the rubber-reinforced resin (A) being 10 to 70% by weight, and
the grafted rubber-like polymer (A1) having such a particle size distribution that the weight percentage of the particles having a size of not less than 80 nm and less than 200 nm is not less than 30% by weight, the weight percentage of the particles having a size of not less than 200 nm and less than 350 nm is not more than 70% by weight, and the weight percentage of the particles having a size of not less than 350 nm is not more than 15% by weight.
In the second aspect of the present invention, there is provided a thermoplastic resin composition comprising 20 to 60 parts by weight of a rubber-reinforced resin (A) and 40 to 80 parts by weight of an aromatic polycarbonate (B) having a weight-average molecular weight of 16,000 to 30,000 ((A)+(B)=100 parts by weight),
said rubber-reinforced resin (A) containing a grafted rubber-like polymer (Al) obtained by polymerizing at least one compound (b) selected from the group consisting of aromatic vinyl compounds, vinyl cyanide compounds, (meth)acrylic ester compounds, acid anhydride monomeric compounds and maleimide-based compounds in the presence of a rubber-like polymer (a) which has such a particle size distribution that the weight percentage of the particles having a size of not less than 80 nm and less than 200 nm is not less than 30% by weight, the weight percentage of the particles having a size of not less than 200 nm and less than 350 nm is not more than 70% by weight, and the weight percentage of the particles having a size of not less than 350 nm is not more than 15% by weight, and which rubber-like polymer (a) has a glass transition temperature of not more than −40° C., and
the content of the rubber-like polymer (a) in the rubber-reinforced resin (A) being 10 to 70% by weight.
In the third aspect of the present invention, there is provided a thermoplastic resin composition comprising 20 to 60 parts by weight of a rubber-reinforced resin (A) and 40 to 80 parts by weight of an aromatic polycarbonate (B) having a weight-average molecular weight of 16,000 to 30,000 ((A)+(B)=100 parts by weight),
said rubber-reinforced resin (A) containing at least two following grafted rubber-like polymers, namely a first grafted rubber-like polymer (All) obtained by graft polymerizing at least one first monomeric compound (b1) selected from the group consisting of aromatic vinyl compounds, vinyl cyanide compounds, (meth)acrylic ester compounds, acid anhydride monomeric compounds and maleimide-based compounds in the presence of a first rubber-like polymer (a1) having a specified particle size distribution and a glass transition temperature of not more than −40° C., and a second grafted rubber-like polymer (A12) obtained by graft polymerizing at least one second monomeric compound (b2) selected from the group consisting of aromatic vinyl compounds, vinyl cyanide compounds, (meth)acrylic ester compounds, acid anhydride monomeric compounds and maleimide-based compounds in the presence of a second rubber-like polymer (a2) having a specific particle size distribution different from that of the first rubber-like polymer (a1) and a glass transition temperature of not more than −40° C.,
said grafted rubber-like polymers in the rubber-reinforced resin (A) having such a particle size distribution that the weight percentage of the particles having a size of not less than 80 nm and less than 200 nm is not less than 30% by weight, the weight percentage of the particles having a size of not less than 200 nm and less than 350 nm is not more than 70% by weight, and the weight percentage of the particles having a size of not less than 350 nm. is not more than 15% by weight, and
the content of the rubber-like polymers (a) comprising at least the first rubber-like polymer (a1) and the second rubber-like polymer (a2) in the rubber-reinforced resin (A) being 10 to 70% by weight, and the overall amount of the monomeric compounds (b) comprising at least the first monomeric compound (b1) and the second monomeric compound (b2) being 90 to 30% by weight (the sum of the overall amount of said rubber-like polymers (a) and the overall amount of said compounds (b) being 100% by weight).
DETAILED DESCRIPTION OF THE INVENTION
In the thermoplastic resin composition according to the first or any other aspect of the present invention, it is essential that the particle size distribution of the grafted rubber-like polymer (A1) falls within the specified range, irrespective of the production process used. For example, the thermoplastic resin composition according to the second aspect or the third aspect of the present invention is also specified by the fact that the obtained particle size distribution falls within the above-defined range.
In the particle size distribution of the grafted rubber-like polymer (A1) according to the first aspect or the grafted rubber-like polymer (A1=A11+A12+A13 . . . ) according to the third aspect, the percentage of the particles having a size of not less than 80 nm and less than 200 nm is not less than 30% by weight, preferably not less than 40% by weight, especially 40 to 80% by weight. The percentage of the particles having a size of not less than 200 nm and less than 350 nm is not more than 70% by weight, preferably not more than 60% by weight, especially 20 to 60% by weight, and the percentage of the particles having a size of not less than 350 nm is not more than 15% by weight
Itou Yasuhiko
Iwai Kazuki
Toyoda Toshiyuki
Toyoshima Tetsuro
Buttner David J.
Nixon & Vanderhye
Techno Polymer Co., Ltd.
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