 System and method for implanting cardiac valves |
| OF THE PREFERRED EMBODIMENTS FIG. 1 shows a stent 1 made by support means in the form of two 0.55 ... |
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| Device and methods for in vivo culturing of diverse tissue cells |
| The anatomically specific device is a living prosthesis or implant for transport and for in viva ... |
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| Apparatus and method for performing vertical banded gastroplasty |
| In accordance with the present invention, an apparatus and method which enable vertical banded ... |
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| Method for retrieving pancreatic juice utilizing and endoscopically wire-guided catheter |
| The present invention is an improved method for accurately and quickly positioning a double lumen ... |
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| Guide tube for gastrostomy tube placement |
| FIG. 1 shows a preferred guide tube 10 which is approximately 40 cm in overall length and ... |
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| System for applying fasteners to tissue |
| The invention includes a surgical fastener and an applicator used in delivering the fastener into ... |
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| Body fluids and solids drainage system |
| Accordingly, the primary objective of the present invention is to provide a system for facilitating ... |
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| Applicator for attaching fasteners to tissue |
| The invention includes a surgical fastener and an applicator used in delivering the fastener into ... |
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| Device for endoscopic vessel harvesting |
| Applicant has devised an apparatus for removing vessels and arteries from the patient with ... |
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| Method and device for full thickness resectioning of an organ |
| The present invention is directed to a full-thickness resection system comprising a flexible ... |
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Impact resistant thermoplastic resin composition
| Details |
Inventors: Nakai, Yoshio; Tateyama, Masamitsu;
Assignee: Mitsubishi Rayon Company Ltd. (Tokyo, JP)
Primary Examiner: Ziegler; Jacob
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland & Maier
Disclosed is an impact-resistant thermoplastic resin composition which comprises a graft copolymer [II]. The graft copolymer [II] is prepared by enlarging the particles in a latex of a rubbery copolymer [I] formed by emulsion polymerization of a monomer mixture of 51-91 wt. % of an alkyl acrylate and 49-1 wt. % of 1,3-butadiene to adjust the particle size to 0.12-0.4 .mu.m by addition of (A) an acid group-containing copolymer obtained by performing emulsion polymerization of a mixture of 3-40 wt. % of acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, cinnamic acid, sorbic acid and/or p-styrene-sulfonic acid, and 97-35 wt. % of an alkyl acrylate, and (B) a salt of an oxyacid having a central element of Groups III to VI of the periodic table, the element belonging to the second or third period, with an alkali or alkaline earth metal or Zn, Ni or Al; and then, polymerizing in the presence of the enlarged rubber copolymer a monomer or monomer mixture comprising 50-100 wt. % of methyl methacrylate and/or styrene. A polymer or copolymer of methyl methacrylate and/or styrene may be incorporated in the thermoplastic resin composition. |
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DETAILED DESCRIPTION We claim: 1.
An impact resistant thermoplastic resin composition comprising a graft copolymer II obtained by: (i) emulsion-polymerizing a monomer mixture (a) comprising 51% to 99% by weight of an alkyl acrylate having 2 to 8 carbon atoms in the alkyl group and 49% to 1% by weight of 1,3-butadiene to obtain a rubbery copolymer I in the form of a latex; (ii) enlarging the particles of the rubbery copolymer I to an enlarged rubber copolymer 1' by adjusting adjust the average particle size to 0.
12 to 0.
4 .
mu.
m by the addition of: (A) an acid group-containing copolymer in the form of a polymer latex obtained by emulsion polymerizing a monomer mixture (b) comprising 3% to 40% by weight of at least one unsaturated acid monomer selected from the group consisting of acrylic acid, methacrylic, crotonic acid, cinnamic acid and sorbic acid, 97% to 35% by weight of an alkyl acrylate having 1 to 12 carbon atoms in the alkyl group, and 0% to 40% by weight of other copolymerizable monomer, according to an at least two stage polymerization process including the stages of first polymerizing a portion occupying 5% to 90% by weight of the monomer mixture (b) but not containing the unsaturated acid monomer and subsequently polymerizing the remaining portion occupying 95% to 10% by weight of the monomer mixture (b) and containing the unsaturated acid monomer, and (B) at least one salt of an oxyacid having a central element selected from the group consisting of the elements of Groups III, IV, V, and VI of the periodic table, said elements belonging to the second and third periods, with a metal selected from the group consisting of alkali metals, alkaline earth metals, zinc, nickel, and aluminum, the total amount of the acid group-containing copolymer (A) and the oxyacid salt (B) being in the range of 0.
1 to 5 parts by weight based on 100 parts by weight of the solid polymer constituent in the latex of the rubbery copolymer I and the proportion of the acid group-containing copolymer (A)/the oxyacid salt (B) being 1/(0
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Obesity Surgery 
