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
1999-04-27
2001-03-20
Seidleck, James J. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S086000
Reexamination Certificate
active
06204327
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a vinyl chloride resin composition. More particularly, the present invention relates to a vinyl chloride resin composition having a good balance between falling weight strength as a typical example for evaluation of a ductile destruction and Charpy strength as a typical example for evaluation of a brittle destruction, and an excellent impact resistance, which can be preferably used for the production of a molded material such as a pipe or a window frame by extrusion molding.
BACKGROUND ART
Conventionally, as a reinforcer for improving impact resistance of a vinyl chloride resin, a so-called MBS resin prepared by graft copolymerizing methyl methacrylate, styrene or the like with a butadiene rubber has been developed. In addition to a method of using the MBS resin, various methods for improving impact resistance of the vinyl chloride resin have hitherto been studied.
However, in the utilization field of the vinyl chloride resin, it has been recently required that the vinyl chloride resin has a high impact strength according to various evaluation methods in view of practical strength. As to a pipe made of the vinyl chloride resin, for instance, it has been required for the pipe to be excellent in both falling weight strength capable of coping with destruction caused by stroke in case of conveying and burying in the ground, and Charpy strength capable of coping with destruction easily caused by a notch effect at the flaw part in case that the flaw is formed and an impact occurs.
The present invention has been accomplished in consideration of the above prior art, and aims at providing a vinyl chloride resin composition having a good balance between falling weight strength and Charpy strength, and an excellent impact resistance.
DISCLOSURE OF THE INVENTION
The present invention relates to a vinyl chloride resin composition containing
a graft copolymer (A) having an average particle diameter of at least 0.15 &mgr;m, prepared by polymerizing 50 to 90% by weight of a solid matter of a rubber latex (a) having a glass transition temperature of at most 0° C., the rubber latex (a) being prepared by polymerizing 50 to 100% by weight of butadiene and/or alkyl acrylate (a-1), 0 to 40% by weight of an aromatic vinyl monomer (a-2), 0 to 10% by weight of a vinyl monomer (a-3) capable of copolymerizing with the butadiene and/or alkyl acrylate (a-1) and the aromatic vinyl monomer (a-2), and 0 to 5% by weight of a polyfunctional monomer (a-4), with 10 to 50% by weight of a monomer mixture (b) comprising 10 to 100% by weight of an alkyl methacrylate (b-1), 0 to 90% by weight of an aromatic vinyl monomer (b-2), 0 to 25% by weight of a vinyl cyanide monomer (b-3) and 0 to 20% by weight of a vinyl monomer (b-4) capable of copolymerizing with the alkyl methacrylate (b-1), the aromatic vinyl monomer (b-2) and the vinyl cyanide monomer (b-3);
a graft copolymer (B) having an average particle diameter of 0.05 to 0.13 &mgr;m, prepared by polymerizing 50 to 90% by weight of a solid matter of a rubber latex (a′) having a glass transition temperature of at most 0° C., the rubber latex (a′) being prepared by polymerizing 50 to 100% by weight of butadiene and/or alkyl acrylate (a′-2), 0 to 40% by weight of an aromatic vinyl monomer (a-′2), 0 to 10% by weight of a vinyl monomer (a′-3) capable of copolymerizing with the butadiene and/or alkyl acrylate (a′-1) and the aromatic vinyl monomer (a′-2), and 0 to 5% by weight of a polyfunctional monomer (a′-4), with 10 to 50% by weight of a monomer mixture (b′) comprising 10 to 100% by weight of an alkyl methacrylate (b′-1), 0 to 90% by weight of an aromatic vinyl monomer (b′-2), 0 to 25% by weight of a vinyl cyanide monomer (b′-3) and 0 to 20% by weight of a vinyl monomer (b′-4) capable of copolymerizing with the alkyl methacrylate (b′-1), the aromatic vinyl monomer (b′-2) and the vinyl cyanide monomer (b′-3); and
a vinyl chloride resin (C);
wherein the proportion of the above graft copolymer (A) to the graft copolymer (B) (graft copolymer (A)/graft copolymer (B) (weight ratio)) is 50/50 to 95/5, and the proportion of the total amount of the above graft copolymer (A) and the graft copolymer (B) to the vinyl chloride resin (C) (total amount of graft copolymer (A) and graft copolymer (B)/vinyl chloride resin (C) (weight ratio)) is 1/99 to 30/70.
BEST MODE FOR CARRYING OUT THE INVENTION
The vinyl chloride resin composition of the present invention contains, as described above, a graft copolymer (A) having an average particle diameter of at least 0.15 &mgr;m, prepared by polymerizing 50 to 90% by weight of a solid matter of a rubber latex (a) having a glass transition temperature of at most 0° C., the rubber latex (a) being prepared by polymerizing 50 to 100% by weight of butadiene and/or alkyl acrylate (a-1), 0 to 40% by weight of an aromatic vinyl monomer (a-2), 0 to 10% by weight of a vinyl monomer (a-3) capable of copolymerizing with the butadiene and/or alkyl acrylate (a-1) and the aromatic vinyl monomer (a-2), and 0 to 5% by weight of a polyfunctional monomer (a-4), with 10 to 50% by weight of a monomer mixture (b) comprising 10 to 100% by weight of an alkyl methacrylate (b-1), 0 to 90% by weight of an aromatic vinyl monomer (b-2), 0 to 25% by weight of a vinyl cyanide monomer (b-3) and 0 to 20% by weight of a vinyl monomer (b-4) capable of copolymerizing with the alkyl methacrylate (b-1), the aromatic vinyl monomer (b-2) and the vinyl cyanide monomer (b-3);
a graft copolymer (B) having an average particle diameter of 0.05 to 0.13 &mgr;m, prepared by polymerizing 50 to 90% by weight of a solid matter of a rubber latex (a′) having a glass transition temperature of at most 0° C., the rubber latex (a′) being prepared by polymerizing 50 to 100% by weight of butadiene and/or alkyl acrylate (a′-1), 0 to 40% by weight of an aromatic vinyl monomer (a′-2), 0 to 10% by weight of a vinyl monomer (a′-3) capable of copolymerizing with the butadiene and/or alkyl acrylate (a′-1) and the aromatic vinyl monomer (a′-2), and 0 to 5% by weight of a polyfunctional monomer (a′-4), with 10 to 50% by weight of a monomer mixture (b′) comprising 10 to 100% by weight of an alkyl methacrylate (b′-1), 0 to 90% by weight of an aromatic vinyl monomer (b′-2), 0 to 25% by weight of a vinyl cyanide monomer (b′-3) and 0 to 20% by weight of a vinyl monomer (b′-4) capable of copolymerizing with the alkyl methacrylate (b′-1), the aromatic vinyl monomer (b′-2) and the vinyl cyanide monomer (b′-3); and
a vinyl chloride resin (C); wherein the proportion of the above graft copolymer (A) to the graft copolymer (B) (graft copolymer (A)/graft copolymer (B) (weight ratio)) is 50/50 to 95/5, and the proportion of the total amount of the above graft copolymer (A) and the graft copolymer (B) to the vinyl chloride resin (C) (total amount of graft copolymer (A) and graft copolymer (B)/vinyl chloride resin (C) (weight ratio)) is 1/99 to 30/70.
In the present invention, it is one of large characteristics to use two kinds of graft copolymers having specific different average particle diameters, and it is considered that a balance between falling weight strength and Charpy strength can be improved because craze which performs an important function for absorption of energy and shear yield are sufficiently generated.
The graft copolymer (A) used in the present invention is obtained by polymerizing a rubber latex (a) having a glass transition temperature of at most 0° C. with a monomer mixture (b).
The rubber latex (a) is obtained, for instance, by an emulsion polymerization of butadiene and/or alkyl acrylate (a-1) and, if necessary, an aromatic vinyl monomer (a-2), a vinyl monomer (a-3) (hereinafter referred to as “vinyl monomer (a-3)”) capable of copolymerizing with the butadiene and/or alkyl acrylate (a-1) and the aromatic vinyl monomer (a-2), and a polyfunctional monomer (a-4).
As the
Nishimura Riichi
Takaki Akira
Takesada Kentaro
Yauchi Shinichi
Yui Koji
Armstrong Westerman Hattori McLeland & Naughton LLP
Asinovsky Olga
Kaneka Corporation
Seidleck James J.
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