Vinyl chloride-based polymer composition for extruded molded article and method for producing the same

Abstract

To provide a vinyl chloride-based polymer composition for an extruded molded article, which is produced through thermal kneading of a vinyl chloride-based polymer, cellulose fiber, and a compatibilizer, which maintains the inherent flame resistance and high thermal insulation of vinyl chloride-based polymers, and which exhibits excellent moldability, rigidity, and heat resistance, and to provide a method for producing the same.SOLUTION: A vinyl chloride-based polymer composition for an extruded molded article contains a vinyl chloride-based polymer (A), cellulose fiber (B), and a compatibilizer (C), wherein the principal raw material of the cellulose fiber (B) is low basis weight paper having a basis weight of 100 g / m2 or less.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a vinyl chloride polymer composition for extrusion profiles having excellent moldability, rigidity and heat resistance, and a method for producing the same. [Background technology]

[0002] Conventionally, extrusions made of vinyl chloride polymer compositions have been known as extrusions used for window frames and the like. Vinyl chloride polymers are widely used as resin molding materials for housing materials such as window frames, as materials with excellent mechanical strength, weather resistance, and chemical resistance. Since the upper limit temperature of the heat resistance of vinyl chloride polymers is about 70 to 90°C, when they are used as exterior members, they may be deformed due to solar heat. In particular, exterior members such as window frames are easily exposed to sunlight and are easily deformed. Therefore, chlorinated vinyl chloride polymers, which have improved heat resistance by chlorinating vinyl chloride polymers, are used for members that require heat resistance. However, chlorinated vinyl chloride polymers have poor fluidity and poor moldability compared to vinyl chloride polymers.

[0003] Furthermore, since chlorinated vinyl chloride polymers are produced by chlorinating vinyl chloride polymers by applying heat energy or light energy, this imposes a large cost burden and also places a large burden on the environment. Summary of the Invention [Problem to be solved by the invention]

[0004] It is therefore an object of the present invention to provide a vinyl chloride polymer composition for extrusion profiles which has excellent moldability, rigidity, heat resistance and environmental properties, and a method for producing the same. [Means for solving the problem]

[0005] As a result of extensive investigations, the present inventors have found that a vinyl chloride polymer composition for extrusion profiles obtained by heating and kneading a vinyl chloride polymer, cellulose fiber, and a compatibilizer maintains the flame retardancy and high heat insulating properties specific to vinyl chloride polymers and has excellent moldability, rigidity, and heat resistance.

[0006] The present invention relates to a vinyl chloride polymer composition for extrusion profiles and a process for producing the same, as described in the following items. Section 1. A vinyl chloride polymer composition for extrusion profiles, comprising a vinyl chloride polymer (A), cellulose fibers (B) and a compatibilizer (C), The raw material of the main component of the cellulose fiber (B) has a basis weight of 100 g / m 2 A vinyl chloride polymer composition for extrusion profiles, comprising the following low basis weight paper: Section 2. Item 2. The vinyl chloride polymer composition for extrusion profiles according to Item 1, further comprising an ethylene-vinyl acetate copolymer (D), the ethylene-vinyl acetate copolymer (D) having a vinyl acetate content of 3% by mass or more and 85% by mass or less, the acetyl groups of the vinyl acetate constituting the ethylene-vinyl acetate copolymer (D) being substituted with hydrogen atoms by a saponification reaction, and the saponification degree being 0% or more and 95% or less. Section 3. Item 3. The vinyl chloride polymer composition for extrusion profiles according to Item 1 or 2, wherein all or a part of the vinyl chloride polymer (A) is a vinyl chloride copolymer (E) obtained by graft polymerization of vinyl chloride onto an ethylene-vinyl acetate copolymer, and the ethylene-vinyl acetate copolymer constituting the vinyl chloride copolymer (E) is the ethylene-vinyl acetate copolymer (D), and the content thereof is 0.3 mass% or more and 40 mass% or less. Section 4. 4. The vinyl chloride polymer composition for extrusion profiles according to any one of Items 1 to 3, wherein all or a part of the vinyl chloride polymer (A) is a vinyl chloride copolymer (F) obtained by copolymerization of vinyl chloride and vinyl acetate, and the vinyl chloride copolymer (F) has a vinyl acetate content of 0.3 mass% or more and 30 mass% or less. Section 5. The low basis weight paper has a basis weight of 3 to 40 g / m 2 5. The vinyl chloride polymer composition for extrusion profiles according to any one of items 1 to 4, which is a thin paper. Section 6. 6. The vinyl chloride polymer composition for extrusion profiles according to any one of Items 1 to 5, wherein the compatibilizer (C) is at least one selected from the group consisting of polyhydric alcohols having a molecular weight of 130 to 400 and plasticizers. Section 7. 7. The vinyl chloride polymer composition for extrusion profiles according to any one of Items 1 to 6, wherein the compatibilizer (C) is tripropylene glycol or a plasticizer. Section 8. 8. The vinyl chloride polymer composition for extrusion profiles according to any one of Items 1 to 7, wherein the compatibilizer (C) is tripropylene glycol, a trimellitic acid ester plasticizer, a phthalic acid plasticizer, or a polyester plasticizer. Section 9. 9. The vinyl chloride polymer composition for extrusion profiles according to any one of Items 1 to 8, comprising 5.0 parts by mass or more and 40 parts by mass or less of the cellulose fibers (B) and 0.02 parts by mass or more and 30 parts by mass or less of the compatibilizer (C), relative to 100 parts by mass of the vinyl chloride polymer (A). Section 10. Item 10. A method for producing a vinyl chloride polymer composition for extrusion profiles according to any one of items 1 to 9, The vinyl chloride polymer (A), cellulose fiber (B), compatibilizer (C), and optionally ethylene-vinyl acetate copolymer (D) are mixed and kneaded under heating, and the raw material of the main component of the cellulose fiber (B) has a basis weight of 100 g / m 2 A method for producing a vinyl chloride polymer composition for extrusion profiles, which is a low basis weight paper, comprising: Section 11. Item 10. An extrusion profile comprising the vinyl chloride polymer composition for extrusion profiles according to any one of items 1 to 9. Effect of the Invention

[0007] According to the present invention, there are provided a vinyl chloride polymer composition for extrusion profiles having excellent moldability, rigidity and heat resistance, and a method for producing the same. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The vinyl chloride polymer composition for extrusion profiles of the present invention and the method for producing the same will be described in detail below. The vinyl chloride polymer composition for extrusion profiles of the present invention is a vinyl chloride polymer composition for extrusion profiles containing a vinyl chloride polymer (A), cellulose fibers (B) and a compatibilizer (C), and the raw material of the main component of the cellulose fibers (B) is a vinyl chloride polymer having a basis weight of 100 g / m. 2 It is characterized by being a low basis weight paper having the following:

[0009] The vinyl chloride polymer composition for extrusion profiles of the present invention comprises a step of mixing a vinyl chloride polymer (A), cellulose fibers (B), a compatibilizer (C), and optionally an ethylene-vinyl acetate copolymer (D), and kneading the mixture under heating. The raw material of the main component of the cellulose fibers (B) has a basis weight of 100 g / m. 2 The low basis weight paper is preferably produced by the following method.

[0010] In this specification, the term "extruded shapes" refers to frame materials, framing materials, battens, and deck materials used in openings such as windows and doors, and in exterior products.

[0011] 1. Vinyl chloride polymer (A) Examples of the vinyl chloride polymer (A) in the present invention include a homopolymer of vinyl chloride, a copolymer of vinyl chloride and another vinyl monomer copolymerizable with vinyl chloride, and further a partially crosslinked vinyl chloride polymer obtained by copolymerization of vinyl chloride, if necessary, another vinyl monomer copolymerizable with vinyl chloride, and a polyfunctional monomer.

[0012] Examples of copolymers of vinyl chloride with other vinyl monomers copolymerizable with vinyl chloride include copolymers of vinyl chloride with at least one of other vinyl monomers copolymerizable with vinyl chloride selected from α-monoolefin monomers such as ethylene, propylene, butylene, etc.; vinyl esters such as vinyl acetate, vinyl propionate, etc.; alkyl vinyl ethers such as methyl vinyl ether, cetyl vinyl ether, etc.; styrene derivatives such as styrene and α-methylstyrene; (meth)acrylic acid esters such as n-butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, etc.; vinyl cyanides such as acrylonitrile, methacrylonitrile, etc.; N-substituted maleimides such as cyclohexylmaleimide, phenylmaleimide, etc.; and vinylidenes such as vinylidene chloride.

[0013] In addition, examples of partially crosslinked vinyl chloride polymers obtained by copolymerization of vinyl chloride with a polyfunctional monomer include copolymers of vinyl chloride with at least one of polyfunctional monomers copolymerizable with vinyl chloride, such as polyfunctional allyl compounds, such as diallyl phthalate, diallyl isophthalate, diallyl terephthalate, diallyl fumarate, diallyl adipate, and triallyl cyanurate; polyfunctional vinyl ethers, such as ethylene glycol divinyl ether and octadecane divinyl ether; and polyfunctional (meth)acrylates, such as 1,3-butylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, and trimethylolpropane tri(meth)acrylate, which are vinyl chloride polymers having a partially crosslinked structure.

[0014] The average degree of polymerization of the vinyl chloride polymer (A) is preferably 600 or more and 3000 or less. By setting it in such a range, it is possible to improve the balance of the moldability of the mixture with the cellulose fibers (B) etc. Here, when the average degree of polymerization of the vinyl chloride polymer (A) is in the range of 700 or more and 2000 or less, the balance of the moldability of the mixture with the cellulose fibers etc. is further improved.

[0015] The method for producing the vinyl chloride polymer (A) is not particularly limited and may be any of suspension polymerization, emulsion polymerization, solution polymerization, bulk polymerization, etc., but suspension polymerization is preferred because it produces less residual monomer.

[0016] The suspension polymerization method for the vinyl chloride polymer (A) is well known, and any known method may be used without any particular limitation. In addition, when the vinyl chloride polymer is produced by a suspension polymerization method such as an emulsion polymerization method, a solution polymerization method, or a bulk polymerization method, a known method may be used.

[0017] 2. Cellulose fiber (B) The cellulose fibers (B) used in the present invention are obtained from a raw material containing low basis weight paper as a main component (preferably 80% by mass or more of the raw material). In the present invention, the low basis weight paper used may be hydrolytically crushed.

[0018] In the present invention, low-weight paper is used, the basis weight of which is 100 g / m 2 The lower limit is not particularly limited, but is usually 3 g / m or less, and preferably 40 g / m or less. 2 That is all. Generally, paper is produced through a papermaking process such as papermaking and coating that is carried out efficiently at high speed, and through a powerful drying process that involves multiple stages. Paper that has undergone such processes tends to have stiff fibers with relatively many hydrogen bond points between the cellulose fibers. In contrast, low-basis weight paper is often produced at a relatively slow speed to prevent paper breakage, and this makes it possible to have cellulose fibers that have few hydrogen bond points and are easily dispersible.

[0019] The method for producing these low basis weight papers is not particularly limited, but they can be obtained by passing a papermaking raw material containing a predetermined concentration of plant fibers through a long wire, short wire or round wire, making a web (wet paper), dehydrating it by squeezing, and further drying it with various known drying devices. In addition, after this, a step of winding it up on a reel may be further provided. Examples of low basis weight papers obtained by such a method include printing papers such as tissue paper, newsprint, wood-free paper, medium-quality paper, and wood-finishing paper, processing papers such as packaging paper, moisture-proof paper, backing paper for wallpaper, base paper for paper containers, base paper for laminated boards, and base paper for molding applications, inkjet recording paper, thermal recording paper, pressure-sensitive recording paper, lightly coated papers such as art paper, form paper, and cardboard base paper, but in order to suppress agglomerates in the vinyl chloride polymer composition for extrusion molding, papers without a coating layer or laminate structure are preferred. These low basis weight papers have a basis weight of 100 g / m 2 As long as it is within the range below, it can be used without any particular limitation, and for example, a commercially available product can be used.

[0020] Furthermore, among the above low basis weight papers, it is preferable to use thin paper with a particularly low basis weight. Specific examples of thin paper that can be used include household thin paper, glassine paper, rice paper, India paper, carbon paper base paper, office thin paper, condenser paper, carbonless base paper, carbon back base paper, pressure-sensitive paper, foil paper, backing paper, insulating paper, release paper, cap body base paper, paper cloth base paper, weaving base paper, noodle belt paper, rayon refined paper, fruit wrapping paper, transfer paper, drawing paper base paper, airmail paper, artificial flower base paper, mizuhiki base paper, motoyui base paper, and tengucho paper. Among these, household tissue paper is more preferable because it contains less chemicals, fillers, and impurities that are mixed in during the pulp and papermaking processes. Household thin papers include tissue paper, toilet paper, wipes, tissue paper, towel paper, napkin paper, table napkin paper, tempura paper, sheet paper, pillow cover paper, diaper paper, diaper paper, dress paper, etc. Toilet paper, tissue paper and wipes are particularly preferred because they use small amounts of chemicals and fillers and are subject to strict hygiene controls to prevent the inclusion of foreign matter and impurities.

[0021] The raw materials for making low basis weight paper used in the present invention may be, for example, wood-based virgin pulp such as softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), or softwood unbleached kraft pulp (NUKP), or recycled waste paper pulp. In addition, wood pulp derived from softwood or hardwood can be used as raw materials for making paper other than those mentioned above, and straw pulp, bagasse pulp, reed pulp, kenaf pulp, linen pulp, ramie pulp, hemp pulp, flax pulp, bamboo pulp, etc. can be used as raw materials for making paper from non-wood plants. In the present invention, the raw materials for making paper may or may not contain lignin, and if lignin is contained, a process for removing lignin may be carried out during the manufacturing process, or a process for removing lignin may be carried out on lignocellulose fibers. Fibers derived from plants that do not originally contain lignin may also be used. Furthermore, as the papermaking raw material, for example, dissolving pulp, sulfite pulp, kraft pulp, semi-chemical pulp, chemi-ground pulp, refiner ground pulp, thermo-mechanical pulp, groundwood pulp, refiner ground pulp, thermo-mechanical pulp, and pulp for fiberboard may be used. Among these papermaking raw materials, wood-based virgin pulp such as softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), or softwood unbleached kraft pulp (NUKP), and recycled waste paper pulp from waste paper are preferred. Using these papermaking raw materials, low basis weight paper can be obtained by carrying out the papermaking process and the drying process. The above papermaking raw materials may be used alone or in combination of two or more kinds.

[0022] The types and mixing ratios of these papermaking raw materials can be adjusted or changed according to the quality required for each type of paper. In addition, various chemicals may be added (internal addition) to achieve the required quality and operational stability. Such chemicals include softeners, bulking agents, dyes, dispersants, wet strength agents, dry strength agents, drainage improvers, pitch control agents, and retention improvers. These papermaking raw materials may also be bleached, and intermediate products that have undergone the drying process during manufacturing, specifically broke paper and recycled paper from the process, may also be used.

[0023] In the present invention, low basis weight paper that has been subjected to a drying process is supplied to the kneader as the cellulose raw material, but the pretreatment method of the low basis weight paper before being supplied to the kneader is not particularly limited. The pretreatment method may be dry or wet crushing, but wet crushing is preferred. By crushing the low basis weight paper in a wet state, i.e., in the form of a water-containing sheet, it is possible to crush the low basis weight paper to a uniform size, which makes it easier to mix with the vinyl chloride polymer (A) in the subsequent process and to supply the low basis weight paper to the kneader. Furthermore, it becomes easier to uniformly carry out the dispersion in the vinyl chloride polymer (A) and the defibration of the cellulose fibers used to a nano level, which are carried out in the kneader. Carrying out this dispersion and defibration at a uniform level is effective in further improving the mechanical strength and impact strength and reducing the linear expansion coefficient. As the disintegration method, a known method can be used, and a jet mill, roll mill, ball mill, cutter mill, stone mill, impact mill, dyno mill, ultrasonic mill, vibration mill, Loedige mixer, Henschel mixer, household juicer mixer, mortar, etc. can be used.

[0024] The content of the cellulose fiber (B) used in the present invention is, in terms of moldability, strength characteristics, and heat resistance, 5.0 parts by mass or more and 40 parts by mass or less, more preferably 7.0 parts by mass or more and 35 parts by mass or less, and even more preferably 9.0 parts by mass or more and 30 parts by mass or less, per 100 parts by mass of the vinyl chloride polymer (A).

[0025] 3. Compatibilizer (C) The compatibilizer (C) used in the present invention is preferably at least one compound selected from polyhydric alcohols having a molecular weight of 130 to 400 and plasticizers.

[0026] The molecular weight of the polyhydric alcohol as used herein refers to the molecular weight of the compound when it is a single compound, and refers to the number average molecular weight of the mixture when it is a mixture of polymers or oligomers.

[0027] As the polyhydric alcohol, polypropylene glycol-based diols (hereinafter also referred to as "PPG-based diols") are preferred. Examples of PPG-based diols include dipropylene glycol, tripropylene glycol, polyoxypropylene glycol with a number average molecular weight of 200, polyoxypropylene glycol with a number average molecular weight of 400, polyether polyols obtained by addition polymerization of propylene oxide (hereinafter also referred to as "PO") to a dihydric alcohol, and polyether polyols obtained by addition polymerization of PO and alkylene oxides other than PO (such as ethylene oxide (hereinafter also referred to as "EO")). The addition polymerization of PO and other alkylene oxides may be random addition polymerization or block addition polymerization. The above polyhydric alcohols may be used alone or in combination of two or more kinds.

[0028] Examples of the dihydric alcohol include dihydric alcohols having 2 to 4 carbon atoms, such as ethylene glycol, propylene glycol, 1,3-butanediol, and 1,4-butanediol. PPG diols have structural isomers depending on the addition polymerization mode of PO, and the PPG diols referred to in this specification include each of the isomers and their mixtures. The molecular weight of the PPG diol is not particularly limited as long as it is in the range of 130 to 400, but is preferably in the range of 130 to 350, more preferably in the range of 130 to 300, and particularly preferably in the range of 150 to 250.

[0029] As the polyhydric alcohol of the compatibilizer (C), an addition polymer of ethylene oxide (EO) (an addition polymer of 3 to 8 EO) having a molecular weight of 130 to 400 is also preferred. Examples of the addition polymer of EO include triethylene glycol, tetraethylene glycol, pentaethylene glycol, hexaethylene glycol, octaethylene glycol, and mixtures thereof. A mixture of EO addition polymers having a number average molecular weight of 200 is called PEG200, and a mixture having a number average molecular weight of 400 is called PEG400.

[0030] In addition, as the polyhydric alcohol, a glycerin derivative having a molecular weight of 130 to 400 and a mixture of the glycerin derivatives can also be used. Specific examples of these glycerin derivatives include a dimer of glycerin (diglycerol) and a product obtained by addition polymerization of PO with glycerin (polyoxypropylene glyceryl ether). Polyoxypropylene glyceryl ether has structural isomers depending on the addition polymerization mode of PO, and the polyoxypropylene glyceryl ether referred to in this specification also includes the structural isomers and mixtures thereof. A preferred polyoxypropylene glyceryl ether is polyoxypropylene glyceryl ether (number average molecular weight 250).

[0031] Among the polyhydric alcohols, from the viewpoint of compatibility between the cellulose fibers and the vinyl chloride polymer composition, at least one polyhydric alcohol selected from the group consisting of dipropylene glycol, triethylene glycol, diglycerol, tripropylene glycol, tetraethylene glycol, polyethylene glycol (number average molecular weight 200 to 400), polyoxypropylene glycol (number average molecular weight 200 to 400), and polyoxypropylene glyceryl ether (number average molecular weight 200 to 400) is preferred, and at least one polyhydric alcohol selected from the group consisting of dipropylene glycol, triethylene glycol, diglycerol, tripropylene glycol, tetraethylene glycol, polyoxypropylene glycol (number average molecular weight 200), polyoxypropylene glycol (number average molecular weight 400), polyoxypropylene glyceryl ether (number average molecular weight 250), and polyoxypropylene glycol (number average molecular weight 400) is more preferred.

[0032] Among these, at least one polyhydric alcohol selected from the group consisting of dipropylene glycol, tripropylene glycol, polyoxypropylene glycol (number average molecular weight 200) and polyoxypropylene glyceryl ether (number average molecular weight 250) is particularly preferred from the standpoint of compatibility.

[0033] The polyhydric alcohol used has a flash point of 100° C. or higher, which is preferable from the standpoint of disaster prevention and safety during the production of the composition of the present invention.

[0034] The above dipropylene glycol, tripropylene glycol, polyoxypropylene glycol (average molecular weight 200), polyoxypropylene glyceryl ether (average molecular weight 250) and polyoxypropylene glycol (average molecular weight 400) each have structural isomers, and these isomers and mixtures thereof are also included in the polyhydric alcohol of the present invention.

[0035] Examples of the plasticizer include phthalate-based plasticizers such as dimethyl phthalate, diethyl phthalate, di-n-butyl phthalate, diisobutyl phthalate, di-n-hexyl phthalate, di-n-heptyl phthalate, di-2-ethylhexyl phthalate, di-n-octyl phthalate, diisononyl phthalate, dinonyl phthalate, diisodecyl phthalate, and butyl benzyl phthalate; adipate-based plasticizers such as dimethyl adipate, di-n-butyl adipate, diisobutyl adipate, di-n-hexyl adipate, di-2-ethylhexyl adipate, diisononyl adipate, and diisodecyl adipate; tri-2-ethylhexyl trimellitate, tri-n-octyl trimellitate, tridecyl trimellitate, triisodecyl trimellitate, and di-n-octyl-n-decyl trimellitate. polyester plasticizers such as phthalic acid polyester; phosphate plasticizers such as trimethyl phosphate, triethyl phosphate, tributyl phosphate, trihexyl phosphate, tributoxyethyl phosphate, trioctyl phosphate, tri-2-ethylhexyl phosphate, triphenyl phosphate, tricresyl phosphate, cresyl phenyl phosphate, trixylyl phosphate, butyl dixylenyl phosphate, octyl diphenyl phosphate, tributoxyethyl phosphate, and trichloroethyl phosphate; citrate plasticizers such as acetyl tributyl citrate; epoxidized vegetable oil plasticizers such as epoxidized soybean oil and epoxidized linseed oil; and sebacate plasticizers such as di-2-ethylhexyl sebacate.

[0036] Among these, trimellitic acid ester plasticizers, phthalic acid plasticizers, and polyester plasticizers are particularly preferred from the viewpoint of compatibility between the cellulose fibers and the vinyl chloride polymer composition.

[0037] The content of the compatibilizer (C) used in the present invention is, in terms of moldability, strength properties, and heat resistance, from 0.02 to 30 parts by mass, more preferably from 0.04 to 27 parts by mass, and even more preferably from 0.06 to 25 parts by mass, per 100 parts by mass of the vinyl chloride polymer (A).

[0038] 4. Ethylene-vinyl acetate copolymer (D) From the viewpoints of moldability, strength properties, and heat resistance of the vinyl chloride polymer composition for extrusion profiles of the present invention, it is preferred that the vinyl chloride polymer composition of the present invention further contains an ethylene-vinyl acetate copolymer (D). The ethylene-vinyl acetate copolymer (D) is a copolymer of a vinyl ester monomer and an ethylene monomer. It is more preferable that the ethylene-vinyl acetate copolymer (D) has a vinyl acetate content of 3% by mass or more and 85% by mass or less (hereinafter also referred to as requirement (a)), and that the acetyl groups of the vinyl acetate constituting the ethylene-vinyl acetate copolymer (D) are replaced with hydrogen atoms by a saponification reaction, with the degree of saponification being 0% or more and 95% or less (hereinafter also referred to as requirement (b)).

[0039] Examples of vinyl ester monomers include vinyl acetate, vinyl propionate, vinyl butyrate, vinyl caproate, vinyl caprylate, vinyl caprate, vinyl laurate, vinyl myristic acid, vinyl palmitate, vinyl stearate, vinyl cyclohexane carboxylate, vinyl pivalate, vinyl octylate, vinyl monochloroacetate, vinyl adipate, vinyl methacrylate, vinyl crotonate, vinyl sorbate, vinyl benzoate, vinyl cinnamate, and vinyl versate. Among these, it is preferable to use vinyl acetate alone.

[0040] The content of vinyl acetate constituting the ethylene-vinyl acetate copolymer (D) is preferably 3% by mass or more and 85% by mass or less, more preferably 15% by mass or more and 50% by mass or less, as required by the above requirement (a), from the viewpoints of moldability, strength properties, and heat resistance of the vinyl chloride polymer composition for extrusion profiles of the present invention. Also, as required by the above requirement (b), the saponification degree of the ethylene-vinyl acetate copolymer (D) is preferably 0% by mass or more and 95% by mass or less, more preferably 0% by mass or more and 90% by mass or less.

[0041] The content of the ethylene-vinyl acetate copolymer (D) used in the present invention is preferably 0.3 parts by mass or more and 40 parts by mass or less, and more preferably 0.5 parts by mass or more and 30 parts by mass or less, per 100 parts by mass of the vinyl chloride polymer (A) in terms of strength characteristics.

[0042] The vinyl chloride polymer (A) in the present invention is a vinyl chloride copolymer (E) (hereinafter also referred to as vinyl chloride copolymer (E)) obtained by graft polymerization of vinyl chloride to an ethylene-vinyl acetate-based copolymer, all or a part of which (preferably 10 mass % or more and 90 mass % or less). The ethylene-vinyl acetate-based copolymer constituting the vinyl chloride copolymer (E) is preferably an ethylene-vinyl acetate-based copolymer (D) having a content of 0.3 mass % or more and 40 mass % or less, from the viewpoints of moldability, strength properties and heat resistance of the vinyl chloride polymer composition for extrusion profiles of the present invention.

[0043] The vinyl chloride polymer (A) in the present invention is a vinyl chloride copolymer (F) (hereinafter also referred to as vinyl chloride copolymer (F)) obtained by copolymerization of vinyl chloride and vinyl acetate, all or a part of which (preferably 10 mass % or more and 90 mass % or less), and the content of vinyl acetate constituting the vinyl chloride copolymer (F) is preferably 0.3 mass % or more and 30 mass % or less, from the viewpoints of moldability, strength properties and heat resistance of the vinyl chloride polymer composition for extrusion profiles of the present invention.

[0044] 5. Vinyl chloride copolymer (E) The vinyl chloride copolymer (E) in the present invention is a graft copolymer obtained by graft polymerization of vinyl chloride onto the ethylene-vinyl acetate copolymer (D). The vinyl chloride copolymer (E) is not particularly limited, but polymers having various properties can be obtained depending on the type of ethylene-vinyl acetate copolymer used and the vinyl acetate content.

[0045] With regard to the vinyl chloride copolymer (E) used in the present invention, it is preferable that the ethylene-vinyl acetate copolymer constituting said vinyl chloride copolymer satisfies the requirements (a) and (b) above, from the viewpoints of moldability, strength properties, and heat resistance of the vinyl chloride polymer composition for extrusion profiles of the present invention, and the content of the ethylene-vinyl acetate copolymer is preferably 0.3 mass% or more and 40 mass% or less, and particularly preferably 0.5 mass% or more and 30 mass% or less, from the viewpoints of moldability, strength properties, and heat resistance of the vinyl chloride polymer composition for extrusion profiles of the present invention.

[0046] 6. Vinyl chloride copolymer (F) The vinyl chloride copolymer (F) in the present invention can be obtained by copolymerizing vinyl chloride monomer and vinyl acetate monomer in an appropriate ratio.

[0047] From the viewpoints of moldability, strength properties, and heat resistance of the vinyl chloride polymer composition for extrusion profiles of the present invention, the vinyl chloride copolymer (F) used in the present invention preferably has a vinyl acetate content of 0.3 mass% or more and 30 mass% or less, and particularly preferably 0.5 mass% or more and 25 mass% or less.

[0048] The vinyl chloride polymer composition for extrusion profiles of the present invention may further contain a lubricant. By containing a lubricant, the flowability of the vinyl chloride polymer composition can be improved, and excellent moldability can be exhibited.

[0049] Examples of the lubricant include aliphatic hydrocarbon-based lubricants, higher fatty acid-based lubricants, aliphatic alcohol-based lubricants, fatty acid ester-based lubricants, and metal soap-based lubricants. Examples of the aliphatic hydrocarbon lubricants include polyethylene wax, montanic acid wax, and paraffin wax. Examples of the higher fatty acid lubricants include stearic acid, hydroxystearic acid, and palmitic acid. Examples of the aliphatic alcohol lubricants include stearyl alcohol and cetyl alcohol. Examples of the fatty acid ester lubricants include triglyceride and butyl stearate. Examples of the metal soap lubricants include barium stearate, calcium stearate, zinc stearate, aluminum stearate, magnesium stearate, zinc stearate-barium stearate complex, zinc stearate-calcium stearate complex, and the like. These may be used alone or in combination of two or more.

[0050] The content of the lubricant is preferably 0.5 parts by mass at the lower limit and 15.0 parts by mass at the upper limit relative to 100 parts by mass of the chlorinated vinyl chloride resin. When the content of the lubricant is equal to or more than the lower limit and equal to or less than the upper limit, a molded article having excellent appearance can be obtained. The content of the lubricant is more preferably 0.7 parts by mass at the lower limit and 13.0 parts by mass at the upper limit relative to 100 parts by mass of the chlorinated vinyl chloride resin.

[0051] The vinyl chloride polymer composition for extrusion profiles of the present invention may be mixed with additives such as a heat stabilizer, a stabilization aid, a processing aid, a heat resistance improver, an ultraviolet absorber, a light stabilizer, a filler, a thermoplastic elastomer, etc., as necessary.

[0052] The heat stabilizer is not particularly limited, and examples thereof include organic tin stabilizers such as dimethyltin mercapto, dibutyltin mercapto, dioctyltin mercapto, dibutyltin maleate, dibutyltin maleate polymer, dioctyltin maleate, dioctyltin maleate polymer, dibutyltin laurate, and dibutyltin laurate polymer, lead-based stabilizers such as lead stearate, dibasic lead phosphite, and tribasic lead sulfate, calcium-zinc-based stabilizers, barium-zinc-based stabilizers, and barium-cadmium-based stabilizers, etc. The heat stabilizers may be used alone or in combination of two or more.

[0053] The stabilizing aid is not particularly limited, and examples thereof include epoxidized soybean oil, epoxidized linseed oil, epoxidized tetrahydrophthalate, epoxidized polybutadiene, and phosphoric acid esters. The stabilizing aid may be used alone or in combination of two or more kinds.

[0054] The processing aid preferably contains an acrylic resin having a weight average molecular weight of 900,000 to 5,000,000. The acrylic resin may be a homopolymer of acrylic acid, methacrylic acid, or (meth)acrylic acid ester, or a (meth)acrylic copolymer containing these. The (meth)acrylic acid ester may be, for example, methyl (meth)acrylate, ethyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, etc. In addition, the (meth)acrylic acid ester may be, for example, n-amyl (meth)acrylate, isoamyl (meth)acrylate, n-hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, etc. However, the (meth)acrylic acid refers to acrylic acid or methacrylic acid. In the present invention, it is preferable to use a polymer of methyl (meth)acrylate (MMA) as the acrylic processing aid.

[0055] The heat resistance improver is not particularly limited, and examples thereof include α-methylstyrene-based, N-phenylmaleimide-based resins, etc. The light stabilizer is not particularly limited, and examples thereof include hindered amine-based light stabilizers, etc.

[0056] The ultraviolet absorbing agent is not particularly limited, and examples thereof include salicylic acid ester-based, benzophenone-based, benzotriazole-based, and cyanoacrylate-based ultraviolet absorbing agents.

[0057] (Production of vinyl chloride polymer composition for extrusion material) The vinyl chloride polymer composition for extrusion profiles of the present invention can be obtained by heating and kneading the above-mentioned vinyl chloride polymer (A), cellulose fiber (B), compatibilizer (C), and, if necessary, ethylene-vinyl acetate copolymer (D) and / or any optional additives.

[0058] The heating and kneading time may be adjusted within the range recommended by the kneading machine manufacturer, taking into consideration the production volume, and the operating conditions such as the performance of the device and the rotation speed. A shorter heating time is preferable because it can prevent deterioration due to heat and oxidation during heating and kneading, but if the heating time is short, there is a possibility that the dispersion in the resin may be insufficient. Therefore, in heating and kneading, it is preferable to include a configuration that strengthens kneading, such as a rotor or kneader, in the screw piece, and in particular, using rotors in multiple places is even more preferable because it can promote nano-fibrillation.

[0059] As the kneader, a single-screw or multi-screw kneader can be used, but a twin-screw kneader is preferred. stomach.

[0060] In the present invention, the vinyl chloride polymer composition, the cellulose fiber, the compatibilizer, and the ethylene-vinyl acetate copolymer and / or any additives used as necessary may be fed to the kneader all at once or in multiple batches. In the case of feeding in multiple batches, a side feeder or the like may be used.

[0061] There is no particular restriction on the number of times the processing is performed in a kneader to obtain a vinyl chloride polymer composition for extrusion profiles. In the case of multiple processing, the same materials may be kneaded multiple times. In the case of multiple processing, the amount of cellulose fibers (B) may be produced at a high concentration of 30 to 80 mass% of the total materials in the first processing, and each time the processing is repeated, vinyl chloride polymer (A), cellulose fibers (B), compatibilizer (C), and optionally, ethylene-vinyl acetate copolymer (D) and / or any additives may be added so that the content of each component contained in the final vinyl chloride polymer composition is within the desired range.

[0062] The cellulose fiber (B) used in the present invention can be any of those obtained by dry-grinding low-basis weight paper that has been subjected to a drying process before kneading, those obtained by wet-grinding in a moist state before grinding, and those obtained by moistening the paper after dry grinding.

[0063] It is also possible to mix the vinyl chloride polymer (A), cellulose fiber (B), compatibilizer (C), and ethylene-vinyl acetate copolymer (D) and / or any additives used as required before heat kneading these materials. In this case, mixing means such as a bench roll, a Banbury mixer, a kneader, a planetary mixer, a Loedige mixer, a Henschel mixer, a stirrer with stirring blades, or a revolution or rotation type stirrer can be used.

[0064] The vinyl chloride polymer composition for extrusion profiles of the present invention obtained as described above has excellent extrusion processability, a Vicat softening temperature of 100° C. or more, a linear expansion coefficient of 60×10 ―6 / K or less, the Vicat softening temperature is 102°C or more, and the linear expansion coefficient is 55×10 ―6 / K or less, and more preferably, the Vicat softening temperature is 104°C or more and the linear expansion coefficient is 50 x 10 ―6 It is more preferable that the value is equal to or less than 1 / K.

[0065] The vinyl chloride polymer composition for extrusion profiles of the present invention can be molded by a conventionally known extrusion molding method to produce a molded article. EXAMPLES

[0066] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0067] Example 1 <Production of vinyl chloride polymer composition for extrusion material> A vinyl chloride polymer (average degree of polymerization 1000) was mixed with 100 parts by mass of cellulose fiber (manufactured by DCM Holdings, pure pulp, basis weight 21 g / m 2 105 parts by mass of a copolymer of 1,2-dimethylformamide (1,2-dimethylformamide, 1,2-dimethylformamide), 25.0 parts by mass of a compatibilizer (TOTM (tri(2-ethylhexyl) trimellitate)), and 5.0 parts by mass of a Ca-Zn stabilizer were fed into a twin-screw extruder (Technovel, screw diameter φ15 mm, L / D 45 (L / D is the ratio of screw length L to length D), rotors used at four locations in the screw configuration) and heated and kneaded to obtain a high fiber concentration masterbatch of a vinyl chloride polymer composition for extrusion profiles. The cylinder temperature of the twin-screw extruder was 130°C. The high fiber concentration master batch was further mixed with a vinyl chloride polymer, a Ca-Zn stabilizer, calcium carbonate, titanium oxide, a processing aid, a reinforcing agent, and a lubricant, and the mixture was fed to two 8-inch roll machines (Kansai Roll's "8-inch oil-heated rolls") and kneaded at 165°C for 10 minutes to form a sheet having a thickness of 0.7 mm. The final composition was 100 parts by mass of vinyl chloride resin, 18.0 parts by mass of cellulose fiber, 4.0 parts by mass of TOTM, 4.0 parts by mass of Ca-Zn stabilizer, 8.0 parts by mass of calcium carbonate, 3.0 parts by mass of titanium oxide, 3.0 parts by mass of acrylic processing aid, 4.0 parts by mass of acrylic reinforcing agent, 0.6 parts by mass of dibasic acid diester, 0.3 parts by mass of microcrystalline wax, and 0.2 parts by mass of complex fatty acid ester. A vinyl chloride polymer composition for extrusion profiles was obtained.

[0068] (Evaluation of vinyl chloride polymer compositions for extrusion profiles) <Mechanical properties (flexural strength, flexural modulus, Vicat softening temperature, linear expansion coefficient)> The obtained vinyl chloride polymer composition sheets for extrusion profiles were stacked and inserted into a press (Shindou Metal Industries' "50 TON automatic compression molding machine"). After preheating for 10 minutes with a press at 185 ° C., a press was applied at 10 MPa for 10 minutes to obtain a press plate with a thickness of 4 mm. A test piece was cut out from the obtained press plate by machining. Using this test piece, the bending strength and bending modulus were measured in accordance with JIS K 7171, and the Vicat softening temperature was measured in accordance with the JIS K 7260 A50 method. The linear expansion coefficient was measured using a thermomechanical measuring device (TA Instruments, TMA Q400EM) under the conditions of compression mode, initial load of 0.005 N, load of 0.005 N, nitrogen gas atmosphere, scanning range of -20 ° C. to 140 ° C., and heating rate of 5 ° C. / min, and the average linear expansion coefficient from 0 ° C. to 60 ° C. was taken as the measured value. The evaluation results are shown in Table 1.

[0069] <Extrusion processability> Using the vinyl chloride polymer composition sheet for extrusion profile, extrusion samples were prepared using a Garvey die in accordance with ASTM D 2230, and the appearance (sharpness of edges and smoothness of surface skin) of each extrusion sample was evaluated visually. The evaluation results were indicated as "◯" when there was no abnormality in appearance, and "×" when defects such as edge cuts or surface roughness occurred. The evaluation results are shown in Table 1.

[0070] Comparative Example 1 A vinyl chloride polymer composition for extrusion material was prepared in the same manner as in Example 1 except that the cellulose fiber was not added, and the mechanical properties and extrusion processability were evaluated. The evaluation results are shown in Table 1.

[0071] (Examples 2 to 4) Vinyl chloride polymer compositions for extrusion profiles were prepared in the same manner as in Example 1, except that the compatibilizer was replaced with DOP (2-ethylhexyl phthalate), adipic acid polyester (ADEKA Cizer PN-7550, manufactured by ADEKA Corporation), and TPG (tripropylene glycol), respectively, and the mechanical properties and extrusion processability were evaluated. The evaluation results are shown in Table 1.

[0072] Example 5 A vinyl chloride polymer composition for extrusion was prepared in the same manner as in Example 1, except that EVA was added when the high fiber concentration master batch was prepared, and the mechanical properties and extrusion processability were evaluated. The evaluation results are shown in Table 1.

[0073] Example 6 A vinyl chloride polymer composition for extrusion was prepared in the same manner as in Example 1, except that the vinyl chloride polymer used in preparing the high fiber concentration master batch was replaced with EVA-G-PVC (a vinyl chloride graft copolymer obtained by graft polymerizing 87% by mass of vinyl chloride onto 13% by mass of EVA), and the mechanical properties and extrusion processability were evaluated. The evaluation results are shown in Table 1.

[0074] Example 7 A vinyl chloride polymer composition for extrusion was prepared in the same manner as in Example 6, except that the compatibilizer was changed from TOTM to a combination of TOTM and TPG, and the mechanical properties and extrusion processability were evaluated. The evaluation results are shown in Table 1.

[0075] (Examples 8 to 9) Vinyl chloride polymer compositions for extrusion profiles were prepared in the same manner as in Example 6, except that the compatibilizer was replaced with DOP and the amount added was changed as shown in Table 1, and the mechanical properties and extrusion processability were evaluated. The evaluation results are shown in Table 1.

[0076] Comparative Example 2 A vinyl chloride polymer composition for extrusion was prepared in the same manner as in Example 6, except that no compatibilizer was added, and the mechanical properties and extrusion processability were evaluated. The evaluation results are shown in Table 1.

[0077] Comparative Example 3 Cellulose fibers are used in high-weight paper (cardboard, 131 g / m 2 A vinyl chloride polymer composition for extrusion was prepared in the same manner as in Example 6, except that 1) was used as the raw material, and the mechanical properties and extrusion processability were evaluated. The evaluation results are shown in Table 1.

[0078] [Table 1]

Claims

1. A vinyl chloride polymer composition for extrusion profiles, comprising a vinyl chloride polymer (A), cellulose fibers (B) and a compatibilizer (C), The raw material of the main component of the cellulose fiber (B) has a basis weight of 100 g / m ２ A vinyl chloride polymer composition for extrusion profiles, comprising the following low basis weight paper:

2. 2. The vinyl chloride polymer composition for extrusion profiles according to claim 1, further comprising an ethylene-vinyl acetate copolymer (D), the ethylene-vinyl acetate copolymer (D) having a vinyl acetate content of 3 mass% or more and 85 mass% or less, the acetyl groups of the vinyl acetate constituting the ethylene-vinyl acetate copolymer (D) being substituted with hydrogen atoms by a saponification reaction, and the saponification degree being 0% or more and 95% or less.

3. 3. The vinyl chloride polymer composition for extrusion profiles according to claim 1, wherein all or a part of the vinyl chloride polymer (A) is a vinyl chloride copolymer (E) obtained by graft polymerization of vinyl chloride onto an ethylene-vinyl acetate copolymer, and the ethylene-vinyl acetate copolymer constituting the vinyl chloride copolymer (E) is the ethylene-vinyl acetate copolymer (D), and the content thereof is 0.3 mass% or more and 40 mass% or less.

4. 3. The vinyl chloride polymer composition for extrusion profiles according to claim 1, wherein all or a part of the vinyl chloride polymer (A) is a vinyl chloride copolymer (F) obtained by copolymerization of vinyl chloride and vinyl acetate, and the content of vinyl acetate constituting the vinyl chloride copolymer (F) is 0.3 mass% or more and 30 mass% or less.

5. The low basis weight paper has a basis weight of 3 to 40 g / m ２ 3. The vinyl chloride polymer composition for extrusion profiles according to claim 1 or 2, which is a tissue paper of the formula (I).

6. 3. The vinyl chloride polymer composition for extrusion profiles according to claim 1, wherein the compatibilizer (C) is at least one selected from the group consisting of polyhydric alcohols having a molecular weight of 130 to 400 and plasticizers.

7. 7. The vinyl chloride polymer composition for extrusion profiles according to claim 6, wherein the compatibilizer (C) is tripropylene glycol or a plasticizer.

8. 8. The vinyl chloride polymer composition for extrusion profiles according to claim 7, wherein the compatibilizer (C) is tripropylene glycol, a trimellitic acid ester plasticizer, a phthalic acid plasticizer, or a polyester plasticizer.

9. 2. The vinyl chloride polymer composition for extrusion profiles according to claim 1, comprising the cellulose fibers (B) in an amount of 5.0 parts by mass or more and 40 parts by mass or less, and the compatibilizer (C) in an amount of 0.02 parts by mass or more and 30 parts by mass or less, relative to 100 parts by mass of the vinyl chloride polymer (A).

10. A method for producing the vinyl chloride polymer composition for extrusion profiles according to claim 1 or 2, comprising the steps of: The vinyl chloride polymer (A), cellulose fiber (B), compatibilizer (C), and optionally ethylene-vinyl acetate copolymer (D) are mixed and kneaded under heating, and the raw material of the main component of the cellulose fiber (B) has a basis weight of 100 g / m ２ A method for producing a vinyl chloride polymer composition for extrusion profiles, which is a low basis weight paper, comprising:

11. 3. An extrusion profile comprising the vinyl chloride polymer composition for extrusion profile according to claim 1 or 2.

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