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
2002-05-14
2004-07-20
Mullis, Jeffrey (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...
C525S080000, C525S086000
Reexamination Certificate
active
06765060
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a graft copolymer composition having a specific particle size distribution. Furthermore, the invention relates to a vinyl chloride-base resin composition containing the graft copolymer composition. More particularly, the invention relates to a graft copolymer composition, which is used for the purpose of imparting am impact strength to molded materials by containing a vinyl chloride-base resin composition, capable of developing a drop-dart strength, which is a typical example of the evaluation of a ductile fracture and a Charpy strength, which is a typical example of the evaluation of a brittle fracture with a good balance. Furthermore, the invention relates to a vinyl chloride-base composition, which has good drop-dart strength and Charpy strength with a good balance, is used for the production of molded materials having an excellent impact strength, and can be suitably used for the production of molded materials such as pipes, window frames, joints, etc., by, for example, extrusion molding, etc. Moreover, the invention relates to a molded material having a good balance of a drop-dart strength and a Charpy strength, and being excellent in the impact strength.
BACKGROUND ART
Hitherto, as the reinforcing agent for improving the impact strength of vinyl chloride-base resins, a so-called MBS resin obtained by graft polymerizing a butadiene-base rubber with methyl methacrylate, styrene, etc., has been developed. Also, as other method of using the MBS resin, about the method of improving the impart strength of vinyl chloride-base resins, various investigations have been made.
However, recently, in the field of utilizing vinyl chloride-base resins, from the relation with the practical strength, it has been required to have high impact strengths in various evaluation methods. For example, in pipes, it has been required to be excellent in both the drop-dart strength, which is the index capable of enduring the damage by impact in the case of transporting or being buried in the ground, and the Charpy strength, which is the index capable of enduring that the pipe is easily damaged by a notch effect of an injured portion in the case of generating an injure and being shocked.
DISCLOSURE OF THE INVENTION
An object of the invention is to provide a resin modifying agent, which is used by being compounded with a vinyl chloride-base resin for imparting am impact strength to the molded materials of the resin and can develop a drop-dart strength and a Charpy strength with a good balance.
Other object of the invention is to provide a vinyl chloride-base resin composition excellent in the impact strength, which gives a molded material having a drop-dart strength and a Charpy strength with a good balance.
Another object of the invention is to provide a molded material which is excellent in the impact strength having a good balance of the drop-dart strength and the Charpy strength.
As the result of making earnest investigations for attaining the above-described objects, the inventors have found the above-described objects can be attained by using a graft copolymer composition having a specific particle size distribution and have accomplished the present invention.
That is, according to the invention, the graft copolymer composition and the vinyl chloride-base resin composition each having the following construction are provided and the above-described objects have been attained.
1. A graft copolymer composition characterized by a mixture of
[1] a graft copolymer (A),
(i) containing a rubbery polymer (a′) at a ratio of from 50 to 90%, by weight obtained by polymerizing monomers comprising from 50 to 100% by weight of a monomer (a-1) constituted of at least one of a butadiene monomer and an alkyl ester of acrylic acid monomer, from 0 to 50% by weight of an aromatic vinyl monomer (a-2), from 0 to 20% by weight of a vinyl monomer (a-3) copolymerizable with the monomer (a-1). and the monomer (a-2), and from 0 to 5% by weight of a non-conjugated multifunctional monomer (a-4) or the mixture (a) thereof (hereinafter, is referred to, for convenience, as a monomer mixture (a)); and having a glass transition temperature of not higher than 0° C.;
(ii) containing a polymer (b′) at a ratio of from 10 to 50% by weight obtained by polymerizing monomers comprising from 10 to 100% weight of a alkyl ester of methacrylic acid monomer (b-1), from 0 to 60% by weight of an alkyl ester of acrylic acid monomer (b-2), from 0 to 90% by weight of an aromatic monomer (b-3), from 0 to 25% by weight of a vinyl cyanide monomer (b-4), and from 0 to 20; by weight of a vinyl monomer (b-5) copolymerizable with the monomer (b-3) and the monomer (b-4) or the mixture (b) thereof (hereinafter, is referred to, for convenience, as a monomer mixture (b)) (wherein, the sum total of the rubbery polymer (a′) and the polymer (b′) is 100% by weight); and
(iii) having a mean particle size of at least 0.15 &mgr;m; said graft copolymer (A) being obtained by graft copolymerizing the monomer mixture (b) to the rubbery polymer (a′) as the trunk polymer, and
[2] a graft copolymer (B),
(i) containing the above-described rubbery polymer (a′) at a ratio of from 50 to 90% by weight;
(ii) containing the above-described polymer (b′) at a ratio of from 10 to 50% by weight (wherein, the sum total of the rubbery polymer (a′) and the polymer (b′) is 100% by weight), and
(iii) having a mean particle size of from 0.03 to 0.13 &mgr;m;
said graft copolymer (B) being obtained by graft copolymerizing the monomer mixture (b) to the rubbery polymer (a′) as the trunk polymer; wherein
the graft copolymer (A) occupies at least 5% by weight and less than 50% by weight of the sum total amounts of the graft copolymer (A) and the graft copolymer (B).
2. The graft copolymer composition described in above-described 1, wherein the graft copolymer (A) occupies from 10 to 40% by weight of the sum total amounts of the graft copolymer (A) and the graft copolymer (B).
3. The graft copolymer composition described in above-described 2, wherein the graft copolymer (A) occupies from 15 to 35% by weight of the sum total amounts of the graft copolymer (A) and the graft copolymer (B).
4. The graft copolymer composition described in above-described 1, wherein the mean particle size of the graft copolymer (A) is from 0.16 to 0.5 &mgr;m.
5. The graft copolymer composition described in above-described 4, wherein the mean particle size of the graft copolymer (A) is from 0.17 to 0.28 &mgr;m.
6. The graft copolymer composition described in above-described 1, wherein the mean particle size of the graft copolymer (a) is from 0.05 to 0.12 &mgr;m.
7. The graft copolymer composition described in above-described 1, wherein the monomer (a-1) is constituted of from 0 to 25% by weight of a butadiene monomer and from 75 to 100% by weight of an alkyl ester of acrylic acid monomer (wherein the sum total of both the monomers is 100% by weight).
8. The graft copolymer composition described in above-described 7, wherein the monomer (a-1) is constituted of the alkyl ester of acrylic acid monomer only.
9. The graft copolymer composition described in above-described 1, wherein the monomer mixture (a) does not contain the aromatic vinyl monomer (a-2).
10. The graft copolymer composition described in above-described 1, wherein the monomer mixture (a) does not contain the vinyl monomer (a-3).
11. The graft copolymer composition described in above-described 1, wherein the ratio of the non-conjugated multifunctional monomer (a-4) contained in the monomer mixture (a) is from 0.1 to 3% by weight,
12. The graft copolymer composition described in above-described 1, wherein the alkyl ester of methacrylic acid monomer (b-1) contains a methyl methacrylate monomer at a ratio of from 60 to 100% by weight.
13. The graft copolymer composition described in above-described 12, wherein the alkyl ester of methacrylic acid monomer (b-1) contains methyl methacrylate monomer at a ratio of from 60 to 100% by weigh
Iguchi Hirokazu
Kadokura Mamoru
Saegusa Kazunori
Kaneka Corporation
Mullis Jeffrey
Westerman Hattori Daniels & Adrian LLP
LandOfFree
Graft copolymer composition and vinyl chloride resin... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Graft copolymer composition and vinyl chloride resin..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Graft copolymer composition and vinyl chloride resin... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3200993