JPS61278514A - Sash - Google Patents

Abstract

PURPOSE:A sash excellent in heat resistance, mechanical strength, dimensional stability, weathering resistance and moldability, prepared by molding a copolymer having structural units derived from vinyl chloride and structural units derived from a specified N-substituted maleimide. CONSTITUTION:A copolymer is contained by suspension-polymerizing 50-99wt% vinyl chloride, 1-50wt% N-substituted maleimide of the formula [wherein R is 1-30C (un)substituted aliphatic, alicyclic or aromatic group and R' and R'' are each H, F, Cl, Br, cyano or a 3C or lower alkyl] and 0-30wt% other polymerizable monomers (e.g., vinyl acetate) in the presence of a free radical generating catalyst in an aqueous medium containing a suspension stabilizer. To this copolymer a stabilier, a lubricant, a processing aid, a filler, a pigment, etc., are added, and the mixture is melt-kneaded and molded into a sash.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a window frame, and particularly to a window frame that has excellent heat resistance, mechanical strength, one-dimensional stability, weather resistance, and material moldability.

[Conventional technology]

Conventionally, window frames made of polyvinyl chloride resin have been widely used because of their excellent mechanical strength, moldability, weather resistance, dimensional stability, and the like.

[Problem that the invention seeks to solve]

However, window frames made of ordinary polyvinyl chloride resins have poor heat resistance, so they have the problem of being difficult to use in high-temperature locations or sunny locations in midsummer. Chlorinated polyvinyl chloride resins are known as having improved heat resistance, but they have the drawback of being inferior in moldability compared to ordinary polyvinyl chloride resins.

[Means for solving problems]

The present invention solves the problems of the conventional window frames made of polyvinyl chloride-based resins, and aims to solve the problems of the conventional window frames made of polyvinyl chloride-based resins.

[wherein R is a substituted or unsubstituted aliphatic, alicyclic or aromatic group having 1 to 30 carbon atoms; R' and R'
may be the same or different and are a hydrogen, fluorine, chlorine or bromine atom, a cyan group, or an alkyl group having 3 or less carbon atoms. The present invention provides a window frame molded using a copolymer containing 1 to 50% by weight of a structural unit derived from an N-substituted maleimide represented by the following.

The copolymer used in the present invention is composed of vinyl chloride and the general formula (1
) with an N-substituted maleimide in the presence of a free radical-generating catalyst.

Specific examples of the N-substituted maleimide of general formula (I) include: N-methylmaleimide, N-ethylmaleimide, N-n-propylmaleimide, N-isopropylmaleimide, N-n-butylmaleimide, N-t-butylmaleimide N-hexylmaleimide, N-cyclohexylmaleimide, N-phenylmaleimide.

N-Cpe■10)-Hydroxyphenylmaleimide, N-(p, ms, o)-methoxyphenylmaleimide.

N-(p,*,o)-chlorophenylmaleimide, N-(p,ta,o)-carboxyphenylmaleimide, N-(p,w,,o)-nitrophenylmaleimide.

N-laurylmaleimide.

N-bicyclo-(2,2,1)-hebutyl-2-methylmaleimide, N-9,10-ethano-9,10-dihydroanthracenemaleimide, N-triphenylmethylbenzylmaleimide, etc. Particularly preferably, R is methyl;
t-Butyl, cyclohexyl, bicyclo-(2,2,1
)-hebutyl-2-methyl, 9,10-ethano-9,1
Examples include 0-dihydroanthracene residue, triphenylmethylbenzyl, and the like.

The copolymer used in the present invention has a structural unit derived from vinyl chloride in an amount of 50 to 99% by weight, preferably 70 to 95% by weight.
and the structural unit derived from the N-substituted maleimide of general formula (1) is 1 to 50% by weight, preferably 5 to 30% by weight.
It is. If the content of the structural unit derived from N-substituted maleimide in the copolymer is less than 1% by weight, it is difficult to improve the heat resistance of the copolymer, and if it exceeds 50% by weight, the resulting copolymer The melting temperature is too high, resulting in poor moldability.

In the method for producing a copolymer of the present invention, at least one polymer that can be graft-polymerized with other polymerizable monomers and vinyl chloride can be used as a raw material, if necessary.

Other polymerizable monomers include vinyl esters such as vinyl acetate, vinyl caproate, vinyl laurate, and vinyl stearate, olefins such as ethylene, propylene, and isobutylene, isobutyl vinyl ether, octyl vinyl ether, dodecyl vinyl ether, and phenyl. Alkyl vinyl ethers such as vinyl ether, halogenated olefins such as vinylidene chloride, vinyl fluoride, propylene chloride, vinyl bromide, ethyl acrylate, n-
Butyl acrylate, n-butyl methacrylate, 2-
Examples include acrylic acid and methacrylic acid esters such as ethylhexyl acrylate, 2-ethylhexyl methacrylate, and stearyl methacrylate, and acrylic derivatives such as acrylic acid, methacrylic acid, crotonic acid, acrylonitrile, maleic anhydride, and itaconic anhydride. be done. These are not limited to one type, and two or more types may be used simultaneously.

In addition, examples of polymers that can be graft-polymerized with vinyl chloride include ethylene-vinyl acetate copolymer (OVA), ethylene-ethyl acrylate copolymer, chlorinated polyethylene, polyurethane, polybutadiene-styrene-methyl methacrylate (MBS), Examples include polybutadiene-acrylonitrile-(α-methyl)styrene (ABS), polybutyl acrylate, butyl rubber, polystyrene, styrene-butadiene copolymer, and crosslinked acrylic rubber.

The above-mentioned other polymerizable monomers and polymers contain 30% by weight of the constituent parts derived therefrom in the resulting copolymer.
It is preferable to use less than 30% by weight, preferably 15% by weight or less, but if the component derived from these components exceeds 30% by weight, the inherent characteristics of polyvinyl chloride resin, namely high mechanical strength, Durability etc. will be lost.

In the production of the copolymer, the amount of raw materials used is adjusted so that the constituent parts derived from each raw material monomer and the polymer used in some cases in the resulting copolymer are in the above-mentioned proportions.
It is possible for those skilled in the art to easily control the polymerization conditions as appropriate. For example, the desired composition can be achieved by monitoring the amount of each monomer charged and the reaction rate of a specific monomer. A copolymer of can be produced.

The copolymer can be produced by any method such as bulk polymerization, suspension polymerization, emulsion polymerization, etc.
Generally, suspension polymerization is industrially and economically advantageous.

As the free radical generating catalyst used in the polymerization, those commonly used in the polymerization of vinyl chloride can be used, such as decanoyl peroxide, lauroyl peroxide, benzoyl peroxide, di(isopropyl) peroxycabonate, Diacyl peroxides such as di(2-ethylhexyl) peroxycarbonate and acetylcyclohexylsulfonyl peroxide.

Organic peroxides of peroxyesters such as tart-butylperoxypivalate and tert-butylperoxyneodecanate, and α,α′-azobisisobutyronitrile, α,α-azobis-2,4- Dimethylvaleronitrile, α, α′-azobis-4-methoxy-2,
Examples include azo compounds such as 4-dimethylvaleronitrile, and water-soluble peroxides such as potassium persulfate and ammonium persulfate, and these can be used alone or in combination of two or more.

As the polymerization method, the suspension polymerization method is preferable as described above, but the suspension stabilizer used in that case may be one that is normally used in the polymerization of vinyl chloride monomers. Stabilizers include fully saponified or partially saponified polyvinyl alcohol, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, carboxymethylcellulose, and polyvinylpyrrolidone.

Examples include synthetic polymer compounds such as maleic anhydride-vinyl acetate copolymer, natural polymer substances such as starch and gelatin, and these are not limited to one type, but two or more types may be used in combination.

The window frame of the present invention can be molded using the above-mentioned copolymer alone, but it can also be used for molding as a composition formed by blending it with other polyvinyl chloride resins. When used as a composition with other polyvinyl chloride resins, the content of the structural unit derived from the N-substituted maleimide of general formula (1) in the composition should be in the range of 1 to 50% by weight. It is necessary that there be.

Examples of polyvinyl chloride resins that can be used in combination with the copolymer of the present invention include, in addition to vinyl chloride homopolymers, copolymers of vinyl chloride and ethylene, propylene, etc., and ethylene-vinyl acetate copolymers. Polymers, ethylene-ethyl acrylate copolymers, multi-component copolymers obtained by graft copolymerizing vinyl chloride onto ethylene polymers such as chlorinated polyethylene, and blends thereof are also included.

When molding the above-mentioned copolymer or a composition of the copolymer and polyvinyl chloride resin into a window frame, stabilizers and, if necessary, lubricants, processing aids, fillers, pigments, etc. are added. The mixture is mixed in a mixer, kneaded in an extruder, etc., and molded in an injection molding machine, etc.

Stabilizers that can be used include, for example, metal salts such as calcium, cadmium, barium or zinc laurates or stearates and soaps; tribasic lead sulfates, dibasic phosphites, dibasic phthalates. acid lead,
Lead stabilizers such as lead white, lead laurate and stearate, di-n-alkyltin mercaptide, di-n-alkyltin dilaurate, dibutyltin dimaleate, dibutyltin lauryl mercaptide, dioctyltin-s, s'-
Bis-(isooctyl-mercaptoacetate), dibutyltin bis-isooctylthioglycolate, di(n
-octyl)tin maleate polymers, tin stabilizers such as dibutyltin mercaptopropionate; antimony stabilizers such as antimony mercaptocarboxylic acid salts or ester salts; and phosphates.

Examples of lubricants include metal soaps, stearic acid, glyceryl monostearate, ethyl diaminostearate, paraffin, and low molecular weight waxes.

Processing aids include acrylonitrile-styrene copolymer (AS), methyl methacrylate-styrene copolymer (MS), acrylonitrile-butadiene-styrene copolymer (ABS), and methyl methacrylate-butadiene-styrene copolymer (MBS). ), paraloid, epichlorohydrin, polymethacrylate, polybutadiene, polystyrene, polyethylene, acrylate polymer, ethylene-vinyl acetate copolymer, and the like.

As the antistatic agent, various cationic, anionic, nonionic, or amphoteric surfactants are used.

In addition, heat resistance improvers such as acrylonitrile-α-methylstyrene-butadiene copolymer, PMMA and acrylic acid ester copolymer, and other fillers, flame retardants, and smoke suppressants that are generally added to vinyl chloride resins are also used. Agents, antioxidants, etc. may be added to the extent that they do not impair the purpose of the present invention.

〔Example〕

Next, the present invention will be specifically explained using examples.

Examples 1-8. Comparative Examples 1 to 4 In each Example and Comparative Example, 100 parts by weight of vinyl chloride-(N-substituted maleimide) copolymer, 5 parts by weight of lead-based stabilizer, 10 parts by weight of paraloid, 0.5 parts by weight of lubricant, and 3 parts by weight of titanium oxide were mixed and a pellet compound was produced using a 50 mφ extruder. Table 1 shows the type and content of N-substituted maleimide in the copolymers used in each Example and Comparative Example. This pellet compound is 19
Press molding was performed at 0° C. for 10 minutes to obtain a 2fi111 thick plate. This plate was subjected to a tensile test and a heating penetration test according to JIS-K-6739. On the other hand, using the pellet compound described above, a 50 mmφ extruder was used to
A 1 mL-shaped product of 0II was molded, and the appearance of the product was observed to evaluate moldability. The results are shown in Table-2.

The moldability was evaluated based on the following criteria.

Evaluation of moldability: O: The surface is smooth and uniform with no flow marks or uneven gloss.

O: The surface is smooth and almost no flow mark unevenness is observed.

62 Flow mark unevenness is observed on the surface.

×: The surface is not smooth and has large flow marks and uneven gloss.

Table 1 [Effects of the Invention] The window frame of the present invention has excellent mechanical strength, dimensional stability, weather resistance, and material moldability equivalent to that of polyvinyl chloride resin, and also has high heat resistance. This made it difficult to use conventional window frames made of polyvinyl chloride resin. It can also be used in places exposed to high temperatures or places exposed to harsh sunlight in the summer.

Claims (1)

[Claims] 50 to 99% by weight of structural units derived from vinyl chloride, and general formula (I) ▲There are numerical formulas, chemical formulas, tables, etc.▼...(I) [In the formula, R is a carbon atom 1 to 30 substituted or unsubstituted aliphatic, alicyclic or aromatic groups; R' and R
'' may be the same or different and is a hydrogen, fluorine, chlorine, or bromine atom, a cyan group, or an alkyl group having 3 or less carbon atoms.] Structural unit 1 derived from an N-substituted maleimide represented by
A window frame molded using a copolymer containing ~50% by weight.