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
2002-04-18
2004-03-16
Nutter, Nathan M. (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...
C525S214000, C525S239000, C264S037170
Reexamination Certificate
active
06706820
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a vinyl chloride resin composition having excellent mechanical properties.
BACKGROUND ART
Since vinyl chloride resins have excellent chemical resistance, weather resistance, and mechanical properties, they are used in various fields such as pipes, building materials, electrical wires and cables, films, or the like. In recent years, resins containing less chlorine are demanded, and thus, polyolefin resins are being studied to partially or entirely replace use of the vinyl chloride resins, in order to reduce the amount of chlorine used in fields where the vinyl chloride resins were conventionally used.
In contrast, it is difficult, in view of economic and technical problems, to completely separate mixed resins including vinyl chloride resins and polyolefin resins to recycle them for the purpose of reducing enviromental pollution. When incompletely separated resins are recycled, mechanical properties of the recycled resins are significantly decreased.
Therefore, although ethylene-vinyl acetate copolymer or chlorinated polyethylene, which are used as an impact modifier in a vinyl chloride resin composition, is suggested to be used as a compatibilizer in order to improve the mechanical properties, sufficient effects have not yet been obtained.
DISCLOSURE OF INVENTION
The present invention is achieved in view of the circumstances described above, and an object of the present invention is to provide a vinyl chloride resin composition having excellent mechanical properties, which can solve the problems described above.
The present inventors have carried out intensive research concerning the vinyl chloride resin composition including a vinyl chloride resin and a polyolefin resin and having excellent mechanical properties, resulting in the discovery that using specific chlorinated polyolefins as a compatibilizer causes improvement of the mechanical properties, and thus results in the completion of the present invention.
That is, the present invention relates to vinyl chloride resin compositions (1) to (6), methods of recycling a resin composition (7) and (8), and a compatibilizer (9), described below.
(1) A vinyl chloride resin composition comprising a chlorinated polyolefin and a resin composition containing a vinyl chloride resin and a polyolefin resin, in which 1 to 30 parts by weight of the chlorinated polyolefin is included relative to 100 parts by weight of the resin composition including 50 to 99 parts by weight of the vinyl chloride resin containing 0 to 50% by weight of a plasticizer and 1 to 50 parts by weight of the polyolefin resin, and in which the chlorinated polyolefin has a heat of fusion of 10 J/g to 100 J/g, which is measured in accordance with a DSC method, and contains 35 to 60% by weight of chlorine in amorphous portions thereof.
(2) A vinyl chloride resin composition according to (1), in which the vinyl chloride resin is a homopolymer of vinyl chloride.
(3) A vinyl chloride resin composition according to (1) or (2), in which the average degree of polymerization of the vinyl chloride resin is within a range from 300 to 2,000.
(4) A vinyl chloride resin composition according to any one of (1) to (3), in which the chlorinated polyolefin is a chlorinated polyethylene.
(5) A vinyl chloride resin composition according to any one of (1) to (4), in which the plasticizer is a phthalate.
(6) A vinyl chloride resin composition according to (5), in which the phthalate is dioctyl phthalate.
(7) A method of recycling a resin composition, comprising a step of adding a chlorinated polyolefin, which has a heat of fusion of 10 to 100 J/g, which is measured by a DSC method, and contains 35 to 60% by weight of chlorine in amorphous portions thereof, into a resin composition comprising a vinyl chloride resin and a polyolefin resin.
(8) A method of recycling a resin composition according to claim 7, wherein the resin composition comprising the vinyl chloride resin and the polyolefin resin is made from an electric cord covering material.
(9) A compatibilizer capable of forming a homogeneous mixture of a vinyl chloride resin and a polyolefin resin, comprising chlorinated polyolefin having a heat of fusion of 10 to 100 J/g, which is measured by a DSC method, and containing 35 to 60% by weight of chlorine in amorphous portions thereof.
BEST MODE FOR CARRYING OUT THE INVENTION
In the following, the present invention will be explained in detail.
Specific examples of a vinyl chloride resin capable of being used in the present invention include a homopolymer of vinyl chloride, and resins prepared from copolymerization of vinyl chloride with another monomer such as a carboxylic acid such as acrylic acid, methacrylic acid, or maleic anhydride, an ester thereof, a vinyl ester such as vinyl acetate or vinyl stearate, vinylidene chloride, ethylene, acrylonitrile, or the like. One or more monomers which can be copolymerized with vinyl chloride can be used for copolymerization with vinyl chloride. Among these vinyl chloride resins, the homopolymer of vinyl chloride is preferably used, because the mechanical properties of the homopolymer are excellent.
The copolymerization ratio of the total monomers excluding vinyl chloride is no more than 40% by weight, preferably no more than 30% by weight, relative to the total weight of the vinyl chloride resin.
The vinyl chloride resin can be produced by a conventional polymerization method such as a suspension polymerization method, an emulsion polymerization method, a bulk polymerization method, or the like.
The average degree of polymerization of the vinyl chloride resin is generally 300 to 2,000, preferably 400 to 1,800, and more preferably 500 to 1,600, in view of kneading properties, mechanical properties, and thermal stability.
The vinyl chloride resin according to the present invention may include or may not include a plasticizer. There are no limitations imposed on the plasticizer contained in the vinyl chloride resin according to the present invention, provided that it is generally known as a plasticizer for the vinyl chloride resin. Specific examples of the plasticizer include phthalate type plasticizers such as dimethyl phthalate, diethyl phthalate, dibutyl phthalate, diheptyl phthalate, di-n-octyl phthalate, di-2-ethylhexyl phthalate, isononyl phthalate, octyldecyl phthalate, diisodecyl phthalate, ditridecyl phthalate, butylbenzyl phthalate, dicyclohexyl phthalate, tetrahydrodi-n-octyl phthalate, tetrahydrodi-2-ethylhexyl phthalate, tetrahydrodiisodecyl phthalate, and the like, phosphate type plasticizers such as triethyl phosphate, tributyl phosphate, tri-2-ethylhexyl phosphate, triphenyl phosphate, tricresyl phosphate, trichloroethyl phosphate, trisdichloropropyl phosphate, tributoxyethyl phosphate, tris(&bgr;-chloropropyl) phosphate, octyldiphenyl phosphate, tris(isopropylphenyl) phosphate, cresylphenyl phosphate, and the like, aliphatic monobasic ester type plasticizers such as methyl oleate, glycerin monooleic ester, and the like, aliphatic dibasic ester type plasticizers such as dibutyl adipate, di-n-hexyl adipate, di-2-ethylhexyl adipate, diisononyl adipate, diisodecyl adipate, dialkyl adipate 610, dibutyl diglycol adipate, di-2-ethylhexyl azelate, di-n-hexyl azelate, dibutyl sebacate, di-2-ethylhexyl sebacate, and the like, dihydric alcoholic ester type plasticizers such as diethylene glycol benzoate, triethylene glycol di-2-ethylbutyrate, and the like, hydroxyester type plasticizers such as methyl acetylricinoleate, butyl acetylricinoleate, butyl phthalyl butyl glycolate, triethyl acethylcitrate, tributyl acethylcitrate, and the like, trimellitate type plasticizers such as trialkyl trimellitate (in which each alkyl group has 4 to 11 carbon atoms), tris-2-ethylhexyl trimellitate, trisoctyl trimellitate, and the like, polyester type plasticizers such as propylene glycol adipate, 1,3-butylene glycol adipate, and the like, which is produced by polymerization of a dibasic acid such as adipic acid, azelaic acid, sebacic acid, phthalic acid, or the like, with a monobasic acid such as glycol, glyceri
Arakawa Tsutomu
Kumaki Terutoshi
Nutter Nathan M.
Showa Denko K.K.
Sughrue & Mion, PLLC
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