JPS608330A - Foamable vinyl chloride resin composition - Google Patents

Abstract

PURPOSE:To provide the titled composition having excellent surface luster and high surface hardness, by compounding a vinyl chloride resin having an average polymerization degree of within a specific range, with thermally decomposable organic (and inorganic) foaming agent, a methacrylate resin and a filler. CONSTITUTION:The objective composition is obtained by compounding (A) a vinyl chloride resin having an average polymerization degree of 500-800 with (B) a thermally decomposable organic foaming agent (e.g. an azo compound) and a thermally decomposable inorganic foaming agent (e.g. sodium bicarbonate), (C) a methacrylate resin (e.g. polymethyl methacrylate) and (D) a filler (e.g. calcium carbonate). The composition is incorporated with a heat-stabilizer and optionally a plasticizer, etc., and formed by extrusion molding, etc. EFFECT:The product contains uniform and fine cells. USE:Heat-insulating product, profiles, etc.

Description

【発明の詳細な説明】 本発明は、平均重合［５００〜８００の塩化ビニル系樹
脂に熱分解型有機発泡剤、熱分解型無機発泡剤、メタク
リル酸エステル系樹脂及び充填剤を配合してなる、表向
光沢に優れ、かつ表面硬度の高いスキン層を有する高発
泡性塩化ビニル系樹脂組成物に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention is a polyvinyl chloride resin having an average polymerization ratio of 500 to 800, blended with a pyrolytic organic blowing agent, a pyrolytic inorganic blowing agent, a methacrylate ester resin, and a filler. , relates to a highly foamable vinyl chloride resin composition having a skin layer with excellent surface gloss and high surface hardness.

塩化ビニル系樹脂性、良好な物理的、化学的性質を有し
ているので１発泡成形品として建材等に適用するに鉱好
適な材料である。しかし、塩化ビニル系樹脂に一般に使
用されているアゾジカルボンアミド、スルホニルヒドラ
ジド等の熱分解型有機発泡剤あるいは重炭酸ソーダ等の
熱分解型無機発泡剤を単純に添加して押出成形に供して
も、（１）成形品表面の肌荒れが激しく、良好なスキン
層が得られない。（２）発泡倍率を上り°るために発泡
剤添加量を増やすと■有機発泡剤の場合、一般に塩化ビ
ニル系樹脂の熱安定性を極端に悪化させ、実用的な成形
に供することができない□（２）無機光を包剤の場合、
発泡セルが粗くなり、強度、外観等が著しく劣ることに
なる。更に、■有機発γ１２剤、無機発泡剤を問わず、
塩化ビニル系樹脂の押出発泡成形の場合、発泡剤の分解
によって生成したセルは、再融着したり、破壊したりす
ることが多く、成形品に空＄１．凹凸０層割れ、収稲等
の不都合を生じ均−做細なセル構造とならない。Since it has vinyl chloride resin properties and good physical and chemical properties, it is a suitable material for use as a single foam molded product in building materials, etc. However, even if a thermally decomposable organic blowing agent such as azodicarbonamide or sulfonyl hydrazide, or a thermally decomposable inorganic blowing agent such as sodium bicarbonate, which is commonly used in vinyl chloride resins, is simply added and subjected to extrusion molding, ( 1) The surface of the molded product is severely roughened and a good skin layer cannot be obtained. (2) If the amount of blowing agent added is increased in order to increase the expansion ratio, ■In the case of organic blowing agents, the thermal stability of vinyl chloride resin will generally be extremely deteriorated, making it impossible to use it for practical molding. (2) In the case of inorganic light as a packaging material,
The foamed cells will become rough and the strength, appearance, etc. will be significantly inferior. Furthermore, ■Regardless of whether it is an organic γ12 blowing agent or an inorganic blowing agent,
In the case of extrusion foam molding of vinyl chloride resin, cells generated by decomposition of the blowing agent often re-fuse or break, leaving an empty $1. This causes inconveniences such as unevenness, layer cracking, and rice harvesting, and does not result in a uniform and fine cell structure.

かかる不都合の基本的原因は、塩化ビニル系樹脂の溶融
粘度特性が良好でないことにあるとされており、これを
改良する方法として例えば、■発泡助剤を添加すること
により発泡剤の分解温度を変えて、有効に発泡セルを生
ぜしめる方法、および■塩化化工ニル系樹脂改質用助剤
を添加する方法などが実用化されている。しかし、■の
発泡助剤、例えばサリチル酸、ステアリン酸、フタル酸
等の有機酸およびこれら有機酸の金属塩、とくに亜鉛塩
等を添加する方法は、ジニトロソペンタメチレンテトラ
ミン等の一部の発泡剤に対して分解温度を低下させる効
果があるだけであり、しかももっばらペーストゾルの発
泡成形用に限られており、硬質塩化ビニル系樹脂の押出
成形には効果的に適用できる方法と拡いいがたい。また
、■の塩化ビニル系樹脂の改質助剤、例えばｕ１ｍ剤や
アクリル酸系樹脂を添加する方法のうち、可塑剤を添加
する方法は、塩化ビニル系樹脂の溶融特性を改良し均一
微細な発泡セルを賦与させるためには相当量の可塑剤の
添加を必要とするため、得られる発泡成形品は、半硬質
ないし軟質となり、弾性率の高い硬質発泡成形品はイ０
ることができない。一方、アクリル酸系樹脂を添加する
方法は、塩化ビニル系樹脂溶融時の樹脂強度を向上させ
１発泡剤の分解によって生じた発泡セルの膜強度を保持
し、発泡セルの再融着や、破壊を防止することにより均
一なセル構造を得ようとするものである。しかし、この
方法においても、単純に発泡剤との組合わせで押出成形
に供しても均−徽細な発泡セルを有する成形品は得られ
ないか、ま次は得られてもその発泡セルが成形品表面ま
で現われるため１表面光沢に優れ、かつ硬度の高いスキ
ンＪｆｌは保有しえなｉｏこの場合にはサイジングダイ
スを用いても表面が滑らかになる程度でスキン層はつく
ることができない。The basic cause of these inconveniences is said to be that the melt viscosity characteristics of vinyl chloride resins are not good.As a method to improve this, for example, Instead, a method of effectively producing foamed cells, and a method of adding a chlorinated polyester resin-based resin modifying agent have been put into practical use. However, the method (2) of adding foaming aids, such as organic acids such as salicylic acid, stearic acid, and phthalic acid, and metal salts of these organic acids, especially zinc salts, can be applied to some foaming agents such as dinitrosopentamethylenetetramine. This method only has the effect of lowering the decomposition temperature of the resin, and is limited to foam molding of paste sol, and is not widely applicable to extrusion molding of hard vinyl chloride resins. sea bream. In addition, among the method (2) of adding a modifier for vinyl chloride resin, such as a U1M agent or acrylic acid resin, the method of adding a plasticizer improves the melting characteristics of vinyl chloride resin and creates a uniform and fine structure. Since it is necessary to add a considerable amount of plasticizer to impart foam cells, the resulting foam molded product will be semi-rigid or soft, and a hard foam molded product with a high elastic modulus will be difficult to achieve.
I can't do it. On the other hand, the method of adding acrylic acid resin improves the resin strength when vinyl chloride resin is melted, maintains the membrane strength of the foamed cells generated by the decomposition of the blowing agent, and prevents the foamed cells from re-melting or breaking. The aim is to obtain a uniform cell structure by preventing this. However, even with this method, if a molded product is simply combined with a foaming agent and subjected to extrusion molding, a molded product with even and fine foam cells cannot be obtained, or even if it is obtained, the foam cells are Because it appears on the surface of the molded product, it is impossible to obtain a skin Jfl with excellent surface gloss and high hardness. In this case, even if a sizing die is used, the surface will be smooth, but a skin layer cannot be formed.

したがって１本発明の目的は、均一微細な発泡セル構造
を有し、かつ、表面光沢に殴れるとともに高い表面硬度
であるスキン層を有する、高発泡塩化ビニル系樹脂成形
品を与える組成物を提供することにおる。Therefore, one object of the present invention is to provide a composition that provides a highly foamed vinyl chloride resin molded product having a uniform and fine foamed cell structure, and a skin layer that has excellent surface gloss and high surface hardness. It's in particular.

本発明のこの目的は、平均重合朋５００−８００の塩化
ビニル系樹脂に、熱分解型有機発泡剤、熱分解型無機発
泡剤、メタクリル敵エステル系樹脂及び充填剤を配合し
てなる仁とを特徴とする発ｒ′＾性塩化ビニル系樹脂組
成物によって達成される。This object of the present invention is to provide a resin made by blending a pyrolytic organic blowing agent, a pyrolytic inorganic blowing agent, a methacrylic ester resin, and a filler with a vinyl chloride resin having an average polymerization ratio of 500-800. This is achieved using a characteristic r'^-prone vinyl chloride resin composition.

本発明において使用される塩化ビニル系樹脂としては、
塩化ビニル単独重合体；塩化ビニル−酢酸ビニル共電合
体、塩化ビニルーエチレン共重合体、塩化ビニル−エチ
レン−酊はビニル共重合体などの塩化ビニル系共重合体
：エチレンー酢酸ビニル共車合体又はエチレン−プロピ
レン系共重合体などに塩化ビニルをグラフト重合させた
塩化ビニル系グラフト共重合体などが挙けられる。その
平均重合度（，０８Ｋ−６７２１）は、５００〜８００
゜好ましくは６００〜７００である。本組成物の成形条
件１発泡倍率等により若干の差異はあるが、平均重合度
が８００を越えると、一般に溶融粘度が高く発ｅｂｔセ
ルが不均一となるとともに微＃な発を段セルが得られな
い。一方、平均重合度がｓｏｎ未清の場合には、比較的
溶融粘度が低く発泡させやすいが、発泡後の冷却工程な
どで収縮しやすいので、得られる発泡成形品は、発泡倍
率が上がらないばかりでなく、強度等の物理的特性が悪
く使用に耐えられない〇 本発明において使用される熱分解型有機ニアｉ／Ｉｆ剤
としてｉｊ、Ｎ、Ｎ’−ジニトロソペンタメチレンテト
ラミン、Ｎ、Ｎ’−ジメチル−Ｎ、　Ｎ’−ジニトロソ
テレフタルアミド等のニトロソ化合物、アゾジカルボン
アミド、アゾビスイソブチロニトリル等のアゾ化合物、
ベンゼンスルホニルヒドラジド、Ｐ、Ｐ’−オキクビス
（ベンゼンスルホニルヒドラジド）。The vinyl chloride resin used in the present invention includes:
Vinyl chloride homopolymer; Vinyl chloride copolymer such as vinyl chloride-vinyl acetate copolymer, vinyl chloride-ethylene copolymer, vinyl chloride-ethylene-vinyl copolymer: ethylene-vinyl acetate copolymer or Examples include vinyl chloride graft copolymers obtained by graft polymerizing vinyl chloride to ethylene-propylene copolymers. Its average degree of polymerization (,08K-6721) is 500 to 800
° Preferably it is 600-700. Molding conditions for this composition 1 Although there are slight differences depending on the expansion ratio, etc., if the average degree of polymerization exceeds 800, the melt viscosity will generally be high, the ebt cells will be non-uniform, and the step cells will not have a slight expansion. I can't do it. On the other hand, when the average degree of polymerization is low, the melt viscosity is relatively low and it is easy to foam, but it is easy to shrink during the cooling process after foaming, so the foam molded product obtained will only have a low expansion ratio. ij,N,N'-dinitrosopentamethylenetetramine, N,N' -Nitroso compounds such as dimethyl-N, N'-dinitrosoterephthalamide, azo compounds such as azodicarbonamide and azobisisobutyronitrile,
Benzenesulfonyl hydrazide, P,P'-okicubis(benzenesulfonylhydrazide).

トルエンスルホニルヒドラジドおよび同誘導（１のスル
ホニルヒドラジド類およびこれらのものを主成分とする
ものが挙けられる。これらの化合物のうち毒性９発泡性
等の観点からアゾ系化合物が特に好ましい。また熱分解
型無機発泡剤としては、重炭酸ナトリウム、重炭酸アン
モニウム、炭酸アンモニウム等およびこれらのものを主
成分とするものが挙けられる０ξれらのうち毒性１発泡
性等の観点から重炭酸ナトリウムが特に好ましい０発泡
剤として有機系の発泡剤だけを用いた場合は、微細な発
泡セルは発現するが、高発泡倍率になると表面にスキン
層をりくるのが難かしく、逆に無機系の発泡剤だけを用
いた場合は、微細な発泡セルを発現するのが難かしい。Examples include toluenesulfonyl hydrazide and its derivatives (sulfonyl hydrazide 1) and compounds containing these as main components.Among these compounds, azo compounds are particularly preferred from the viewpoint of toxicity, foaming properties, etc. Type inorganic foaming agents include sodium bicarbonate, ammonium bicarbonate, ammonium carbonate, etc., and those containing these as main ingredients. Of these, sodium bicarbonate is particularly preferred from the viewpoint of toxicity, foaming properties, etc. If only an organic foaming agent is used as the preferred foaming agent, fine foaming cells will be produced, but when the expansion ratio is high, it will be difficult to form a skin layer on the surface. It is difficult to develop fine foam cells when using only one.

本発明により両者を併用する仁とにより、微細均一な発
泡セル構造および表面にスキン層を有する成形品が得ら
れるのである。発泡剤の添加量は、塩化ビニル系樹脂１
００重量部当たり、有機発泡剤は通常０．０５〜１．０
重量部、好ましくは０．１〜０．５重量部、無機発泡剤
は通常０．１〜５．０重量部、好ましくは０．５〜３．
０重量部とされる。これらの発泡剤の添加量をよ、所望
する発泡成形品の発泡ｆ含率や物理的特性から決定すれ
ばよいが、有機発泡剤および無機発泡剤の添加量が谷々
０，０５京量部および０．１重鷲部未滴の場合は、有効
な発泡培率は得られがたい。According to the present invention, by using both in combination, a molded article having a fine and uniform foamed cell structure and a skin layer on the surface can be obtained. The amount of blowing agent added is 1 part vinyl chloride resin
Per 00 parts by weight, the organic blowing agent is usually 0.05 to 1.0
parts by weight, preferably 0.1 to 0.5 parts by weight, and the inorganic blowing agent usually contains 0.1 to 5.0 parts by weight, preferably 0.5 to 3.0 parts by weight.
0 parts by weight. The amount of these blowing agents added may be determined based on the foam content and physical properties of the desired foamed molded product, but the amount of organic blowing agent and inorganic blowing agent added may vary from 0.05 quintillion parts. In the case of a 0.1 weight drop, it is difficult to obtain an effective foaming ratio.

また、有機発成剤を１．０重１１２４部越えて添加する
と組成物の熱安定性が悪化するので実用性が低くなる。Furthermore, if more than 1.0 parts by weight or 1,124 parts of the organic initiator is added, the thermal stability of the composition will deteriorate, making it less practical.

一方、無（幾発〆包剤の添加液か５．０重量部を越える
と、微細な発ｉ旬セルは得られない。On the other hand, if the additive liquid of the packaging agent exceeds 5.0 parts by weight, fine cells cannot be obtained.

本発明（１ｒｌおいて用いられろメタクリル酸エステル
糸樹）指としては、ポリメチルメタクリレートあるいは
メチルメタクリレートを優位量とする。こレト、エチル
アクリレート、アクリルニトリル等との共重合樹脂が用
いられる。発泡セル特性及び成形性の点でメタクリル酸
エステル系樹脂の好ましい重合度は、ポリメチルメタク
リレート換算で２．０００〜３０，０００である。この
メタクリルロアエステル系樹脂は、塩化ビニル系樹脂の
溶融粘度特性を改良し、本組成物を発泡させてセル構造
を付与する際、塩化ビニル系樹脂の伸びを大きくするこ
とによりセルの膜強度を保持し１発泡セルの破壊を防止
するものである。使用片は塩化ビニル系樹脂１００重量
部当たり通常０．５〜３０重量部、好ましくは１〜２０
重量部である。添加ｐｔが０５重量部未満の場合は、発
泡セル生成時の膜強度を保持することができないため、
発泡セルはいったん生成しても破壊したり、（ｉ）融着
したりするものが多く、均一微細な発泡セル構造は得ら
れない。In the present invention (methacrylic acid ester yarn used in 1rl), polymethyl methacrylate or methyl methacrylate is used in a predominant amount. A copolymer resin with ethyl acrylate, acrylonitrile, etc. is used. From the viewpoint of foam cell properties and moldability, the preferred degree of polymerization of the methacrylic acid ester resin is 2.000 to 30,000 in terms of polymethyl methacrylate. This methacrylic lower ester resin improves the melt viscosity characteristics of the vinyl chloride resin, and when foaming this composition to provide a cell structure, increases the elongation of the vinyl chloride resin, thereby increasing the cell film strength. This is to prevent destruction of one foam cell. The amount of pieces used is usually 0.5 to 30 parts by weight, preferably 1 to 20 parts by weight per 100 parts by weight of vinyl chloride resin.
Parts by weight. If the added pt is less than 0.5 parts by weight, the membrane strength during foam cell production cannot be maintained;
Even if foamed cells are once generated, many of them are destroyed or (i) fused together, making it impossible to obtain a uniform and fine foamed cell structure.

一方、添加量が５０重量部を越えると、溶融粘度が増加
し、塩化ビニル系樹脂の発熱が生じたり、均一な発泡セ
ルが生成しないという不都合が生じる０ 本発明においては、炭酸カルシウム、メルク、クレイ、
アスベスト及びシリカなどを充填剤として使用すること
により、４０られる発７Ｎ成形品の表面硬度を増すとと
もに、表面の肌荒の防止を図ることができ、また、発泡
セル生成時の核形成剤となりうる０光」１剤の平均粒径
は１発泡成形品表面の肌荒れ防止及び均−微晶１な発？
′包セルの生成の点から１．５μ以下であることが好ま
しい。充填剤の使用量は塩化ビニル系樹脂１００Ｍ景部
当たり通常１〜２ｏ重溺部、好ましくは３〜１０重賞部
である。添加能が１重、＃部未満であると、発泡成形品
の表面状態が悪く肌荒れが生じるにかりでなく、核形成
剤とし−Ｃの機能が果し得す、不均一な発泡セル構造を
とるとともに表面硬度も低くなる。また、２０重液部を
越えると溶融時の粘度が増加するとともに溶融樹脂の強
度が低ｎ、、拒成した発泡セルの膜の形状保持ができな
くなり、膜の破壊を生ぜしめる原因となる。On the other hand, if the amount added exceeds 50 parts by weight, the melt viscosity increases, causing problems such as heat generation of the vinyl chloride resin and failure to form uniform foam cells. clay,
By using asbestos, silica, etc. as fillers, it is possible to increase the surface hardness of the 7N molded product and prevent surface roughness, and it can also serve as a nucleating agent when forming foam cells. Is the average particle size of 0 Hikari 1 agent 1 effective in preventing rough skin on the surface of foamed molded products and producing uniform microcrystals?
From the viewpoint of the formation of envelope cells, the thickness is preferably 1.5μ or less. The amount of filler used is usually 1 to 2 parts, preferably 3 to 10 parts, per 100 M parts of the vinyl chloride resin. If the additive capacity is less than 1 part, # part, the surface condition of the foamed molded product will be poor and roughness will occur, and the non-uniform foamed cell structure, which is the function of -C as a nucleating agent, will be created. As the surface hardness increases, the surface hardness also decreases. On the other hand, if it exceeds 20 heavy liquid parts, the viscosity during melting increases and the strength of the molten resin decreases, making it impossible to maintain the shape of the membrane of the foamed cell, resulting in destruction of the membrane.

本発明の組成物を成形するに際しては、前記各成分のほ
かに、塩化ビニル系樹脂用の通常の金属石けん等の熱安
定剤を添加する必要があるほか、成形品の物理的特性を
阻害しない範囲でｐｆ　ｍ剤。When molding the composition of the present invention, in addition to the above-mentioned components, it is necessary to add a heat stabilizer such as a normal metal soap for vinyl chloride resins, and in addition, it is necessary to add a heat stabilizer such as a normal metal soap for vinyl chloride resin, and it is also necessary to add a heat stabilizer that does not inhibit the physical properties of the molded product. pf m agent in range.

着色剤、難燃剤、酸化防止剤、帯電防止剤、紫外線防止
剤等を適宜添加してもよい。成形方法はｌＦケに制限さ
れないが、通常は押出成形法が採用されることが多い。Colorants, flame retardants, antioxidants, antistatic agents, ultraviolet light inhibitors, etc. may be added as appropriate. Although the molding method is not limited to IF, extrusion molding is usually employed.

本発明の組成物により得られた発泡成形品は、均−微晶
１な発泡セルを有するとともに、表面光沢に優れ、また
高い表面硬度を有するものであるので、特に、その特性
を活かした断熱製品、異形製品等としての建材用途に極
めて石川であるう以下、実施例により本発明を説明する
。なお、各配合成分の部数？−１重量基準でおる。また
、発を段成形品の評価は下記Ｖｃ脇った。The foam molded product obtained using the composition of the present invention has homogeneous-microcrystalline foam cells, excellent surface gloss, and high surface hardness, so it is particularly suitable for heat insulation that takes advantage of its properties. The present invention will be explained below with reference to examples. In addition, the number of parts of each compounded ingredient? -1 based on weight. In addition, the evaluation of the stepped molded product was based on the following Vc.

熱安定時間：　下記条件で組成物が熱分解（トルクが急
上昇）するまでの時間。Thermal stability time: The time required for the composition to thermally decompose (torque increases rapidly) under the following conditions.

本条件では１５分以」二であれば よい０ 試峡　機　ブラベンダープラストグラフチャンバー容量
　５００ｃ コｌやンド充ｊｆｉ貴　４５．７ｆｆｌ混線温度　１９
０Ｃ ローター回転数　５　Ｑ　ｒｐｍ 発泡セル状態：　均一性、微細性をＡ（曖）、Ｂ（良）
。Under these conditions, 15 minutes or longer is sufficient.0 Trial machine Brabender plastograph chamber capacity 500c Collar and battery charge 45.7ffl Crosstalk temperature 19
0C Rotor rotation speed 5 Q rpm Foaming cell condition: Uniformity and fineness A (vague), B (good)
.

０　（ｔ’Ｊ）の三段階で計画。Plan in three stages: 0 (t’J).

表面の硬さ：　５段階評価。５が最も硬い。Surface hardness: 5-level evaluation. 5 is the hardest.

表面性状：　５段階評価０５が最良〇 収　縮　度：　５段階評価。５が最も低収縮。Surface quality: 05 is the best on a 5-point scale Constriction degree: 5-step evaluation. 5 is the lowest shrinkage.

実施例１ 第１表に示す塩化ビニル系樹脂１００部にアゾジカルボ
ンアミド０．１０部、重炭酸ナトリウム１．２部、メチ
ルメタクリレート／エチルアクリレート（９５／７）　
共重合体１０部、炭酸カルシウム（平均粒径０．８μ）
５部、ジブチル錫マレート系安定剤２部及びステアリン
酸１部を添加し、ヘンシェルミキサーで均一に混合した
。得られた組成物の一部を熱安定性試験に供し、残りを
下記の東件による押出成形に供した。結果を第１表に示
す０ シリンダー径　φ４０朋　Ｌ／Ｄ−２２０−Ｒ−２，４
成形部度　０．　１５０〜１６０Ｃ 成形温度　Ｃ，１６０〜１８０Ｃ ０３１５０〜１７０ Ｈ１５０〜１７０ Ｄ’−１４０〜１６０ ダイス形状　１０ｍｍＸ１０鰭角 ランド長さ　１００ｍ 第１表 本　比較例 第１表より、本発明組成物（実験番号２．．３．４．６
　）は優れた発泡成形品を与えることがわかる。なお、
実験番号１は、表面スキン層の形成が難しく成形品の収
縮Ｉｆが太きく発泡培率は上昇しにくい。また、実験番
号５においては、表面性状が悪く（ブレーカ−ラインが
残る）、発泡１亀率も上昇しにくいＯ 比咬例 実施例１実験番号３で用いた配合成分のうちいずれかを
無添加としたほかをよ同様の実験を行ったり結果を＃Ｔ
　２表に示す。Example 1 100 parts of vinyl chloride resin shown in Table 1, 0.10 part of azodicarbonamide, 1.2 parts of sodium bicarbonate, methyl methacrylate/ethyl acrylate (95/7)
10 parts of copolymer, calcium carbonate (average particle size 0.8μ)
5 parts, 2 parts of dibutyltin malate stabilizer, and 1 part of stearic acid were added and mixed uniformly using a Henschel mixer. A portion of the resulting composition was subjected to a thermal stability test, and the remainder was subjected to extrusion molding by Tohki Co., Ltd. as described below. The results are shown in Table 10 Cylinder diameter φ40 L/D-220-R-2,4
Molding part degree 0. 150-160C Molding temperature C, 160-180C 03150-170 H150-170 D'-140-160 Dice shape 10mm x 10 fin angle land length 100m Table 1 From Comparative Example Table 1, the present composition (Experiment No. 2) ..3.4.6
) gives an excellent foamed molded product. In addition,
In Experiment No. 1, it was difficult to form the surface skin layer, the shrinkage If of the molded product was large, and the foaming ratio was difficult to increase. In addition, in Experiment No. 5, the surface quality was poor (breaker lines remained) and the foaming rate was difficult to increase. Perform a similar experiment and report the results with #T
It is shown in Table 2.

第２表 困 ＊発泡ガスがセル中で保持されず、樹脂外へ放出されて
しまい一品は４ｆｌ端忙収縮すると共に表面凹凸がはけ
しく測定が不能で第２表より１表示のいずれかの成分が
欠けると。Table 2 is difficult *The foaming gas is not retained in the cell and is released outside the resin, causing the product to shrink by 4 fl, and the surface unevenness is so severe that measurement is impossible. When ingredients are missing.

優れた発泡成形品が得られないことがわかる０実施例２ 実施例１実験番号６で用いたアゾジカルボンアミドをジ
ニトロソペンタメチレンテトラミンに、メチルメタクリ
レート／エチルアクリレート共重合体をポリメチルメタ
クリレートとしたほかは同様の実験を行った。結果を第
６表に示す。0 Example 2 It can be seen that an excellent foam molded product cannot be obtained Example 1 The azodicarbonamide used in Experiment No. 6 was replaced with dinitrosopentamethylenetetramine, and the methyl methacrylate/ethyl acrylate copolymer was replaced with polymethyl methacrylate. The other experiments were similar. The results are shown in Table 6.

実施例６ 実施例１果＠　’市号６で用いた重炭酸す）　ＩＪウム
の代りに重炭酸アンモニウムを１．２　都、　炭酸カル
シウムの代りにｌルクを５部用いたほかにＬ同様の実験
を行った。結果を第３表に不す０ 第′５茨より実６１例２，３においても優れた発泡Ｊ成
形品が（４）られることがわかる。Example 6 Example 1 (Bicarbonate used in City No. 6) 1.2 parts of ammonium bicarbonate was used instead of IJum, and 5 parts of 1L was used instead of calcium carbonate, and the same method as L was used. We conducted an experiment. The results are shown in Table 3. From the '5th thorn, it can be seen that excellent foamed J molded products were also produced in Examples 2 and 3 of Example 61 (4).

実だ４例４ 実施例１実験ａ号３で用いた配合成分を第４表をζ示す
とおりに俊敏したほかれ同様の実験を行った。結果を第
４表に示す。Example 4 Example 1 A similar experiment was conducted except that the ingredients used in Experiment A No. 3 were changed as shown in Table 4. The results are shown in Table 4.

′ｉ４表 第４表より明らかなとおりいずれの場合にも優れた発泡
成形品が得られた。As is clear from Table 4, excellent foam molded products were obtained in all cases.

特ｔｙｆ出順人　日本ゼオン株式会社Special TYF member Nippon Zeon Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 平均重合度５００〜８００の塩化ビニル系樹脂に熱分解
型イ丁機発泡剤、熱分解型無機発泡剤、メ・タクリル酸
エステル系樹脂、及び充填剤を配合してなることを特徴
とする発泡性塩化ビニル系樹脂組成物。Foaming characterized by blending a thermally decomposable blowing agent, a thermally decomposable inorganic foaming agent, a methacrylic acid ester resin, and a filler with a vinyl chloride resin having an average degree of polymerization of 500 to 800. polyvinyl chloride resin composition.