JPH0665565A - Heat storage composition - Google Patents

Heat storage composition

Info

Publication number
JPH0665565A
JPH0665565A JP4219349A JP21934992A JPH0665565A JP H0665565 A JPH0665565 A JP H0665565A JP 4219349 A JP4219349 A JP 4219349A JP 21934992 A JP21934992 A JP 21934992A JP H0665565 A JPH0665565 A JP H0665565A
Authority
JP
Japan
Prior art keywords
heat storage
oily substance
ethylene
storage composition
molecular weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4219349A
Other languages
Japanese (ja)
Inventor
Akira Sugawara
亮 菅原
Masaru Yokoyama
勝 横山
Takashi Kishimoto
隆 岸本
Mikio Sei
三喜男 清
Futoshi Maeda
太 前田
Mitsuhiro Tsuruki
充啓 鶴来
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP4219349A priority Critical patent/JPH0665565A/en
Publication of JPH0665565A publication Critical patent/JPH0665565A/en
Pending legal-status Critical Current

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  • Artificial Filaments (AREA)

Abstract

PURPOSE:To obtain a heat storage compsn. scarcely allowing an oily substance to ooze out and having a high heat storage capacity by dispersing the oily substance in a base resin comprising an ultrahigh-mol.-wt. polyethylene and a low-density ethylene-alpha-olefin copolymer. CONSTITUTION:This compsn. is produced by dispersing an oily substance (e.g. n-paraffin) in a base resin comprising an ultrahigh-mol.-wt. polyethylene having a wt.-average mol.wt. of 1X10<6> or higher and an ethylene-a-olefin copolymer (e.g. an ethylene-propylene copolymer) having a density of 0.925g/cm<3> or lower. When the compsn. is formed into a fiber, the base resin prevents the oily substance from oozing out to the surface of the fiber, this disppensing with the formation of a resin layer on the surface. Using the ultrahigh-mol.-wt. polyethylene gives a heat storage fiber having high elasticity and strengths.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、物質の融解・凝固に
伴う潜熱を利用した蓄熱組成物に関する。この蓄熱組成
物は、特に、繊維化した場合には、蓄熱繊維として有用
である。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage composition utilizing latent heat associated with melting and solidification of a substance. This heat storage composition is particularly useful as a heat storage fiber when it is made into a fiber.

【0002】[0002]

【従来の技術】液状の油性物質を基質に担持させ固体状
にした油性物質担持体が各種提案されている。それらの
中でも、特に、パラフィン等の油性物質を基質樹脂に担
持させた油性物質担持体は、蓄熱体として提案されてお
り、基質樹脂として超高分子量ポリエチレンを用いたも
のが特開昭59−170180号公報に、基質樹脂とし
て高密度ポリエチレン架橋体を用いたものが特開昭62
−187782号公報にそれぞれ開示されている。
2. Description of the Related Art Various oily substance-supporting bodies in which a liquid oily substance is supported on a substrate to form a solid have been proposed. Among them, in particular, an oily substance carrier in which an oily substance such as paraffin is supported on a substrate resin has been proposed as a heat storage body, and one using ultra-high molecular weight polyethylene as the substrate resin is disclosed in JP-A-59-170180. Japanese Unexamined Patent Publication (Kokai) No. Sho 62-62 uses a high-density polyethylene crosslinked body as a substrate resin.
No. 187782.

【0003】この蓄熱体(蓄熱組成物)は、油性物質の
固相−液相間の相転移に要する潜熱を利用した潜熱蓄熱
材である。固相−液相間の相転移を利用した潜熱蓄熱材
は、一般に、その取り扱いが問題になる、すなわち、相
転移により液体になった際、流出してしまうのを防ぐ等
の配慮が必要となり、そのため、このような潜熱蓄熱材
は、通常、金属や樹脂等でできた容器中に納めなければ
ならないのであるが、上述の蓄熱組成物は、基質樹脂と
潜熱蓄熱材であるパラフィン等の油性物質とを混合し、
油性物質を基質樹脂中に含有させて固体状にしたもので
あるため、油性物質の溶融時においても液状にならず、
固体として取り扱うことができるという利点を有する。
This heat storage body (heat storage composition) is a latent heat storage material that utilizes the latent heat required for the phase transition between the solid phase and the liquid phase of an oily substance. Latent heat storage materials utilizing the phase transition between the solid phase and the liquid phase generally have a problem in handling, that is, when the liquid becomes a liquid due to the phase transition, consideration needs to be taken to prevent it from flowing out. Therefore, such a latent heat storage material usually has to be stored in a container made of metal or resin, but the heat storage composition described above has a substrate resin and an oily material such as paraffin which is a latent heat storage material. Mix with the substance,
Since the oily substance is contained in the matrix resin and made into a solid state, it does not become liquid even when the oily substance melts,
It has the advantage that it can be handled as a solid.

【0004】[0004]

【発明が解決しようとする課題】ところが、前述の従来
の蓄熱組成物は、油性物質のしみ出しが大きいという問
題があった。特に、繊維化した場合、弾性が低く、強度
も低いという問題があった。そこで、この発明は、油性
物質のしみ出しが少なく、特に、繊維化した場合、弾性
が高く、強度の強い蓄熱繊維を得ることのできる蓄熱組
成物を提供することを課題とする。
However, the above-described conventional heat storage composition has a problem that the exudation of the oily substance is large. In particular, when it is made into fibers, there is a problem that the elasticity is low and the strength is low. Therefore, an object of the present invention is to provide a heat storage composition capable of obtaining a heat storage fiber having less exudation of an oily substance and having high elasticity and high strength particularly when made into a fiber.

【0005】[0005]

【課題を解決するための手段】前記課題を解決するた
め、この発明にかかる蓄熱組成物は、基質樹脂中に油性
物質が分散した状態で含まれてなる蓄熱組成物であっ
て、前記基質樹脂が、重量平均分子量が1×106 以上
の超高分子量ポリエチレンと密度が0.925g/cm3
以下のエチレン−α−オレフィン共重合体とからなるも
のであることを特徴とする。
In order to solve the above problems, a heat storage composition according to the present invention is a heat storage composition containing an oily substance dispersed in a substrate resin, wherein the substrate resin However, ultrahigh molecular weight polyethylene with a weight average molecular weight of 1 × 10 6 or more and a density of 0.925 g / cm 3
It is characterized by comprising the following ethylene-α-olefin copolymer.

【0006】この発明で用いられる超高分子量ポリエチ
レンは、1×106 以上の重量平均分子量を有するもの
である。このような超高分子量ポリエチレンは、たとえ
ば、エチレン、あるいは、エチレンと少量のα−オレフ
ィン(プロピレン、1−ブテン、4−メチル−1−ペン
テン等)とを、チーグラー重合等の遷移金属触媒を用い
て重合する方法等により得ることができる。
The ultrahigh molecular weight polyethylene used in the present invention has a weight average molecular weight of 1 × 10 6 or more. Such ultra-high molecular weight polyethylene uses, for example, ethylene or ethylene and a small amount of α-olefin (propylene, 1-butene, 4-methyl-1-pentene, etc.) and a transition metal catalyst such as Ziegler polymerization. It can be obtained by a method such as polymerization.

【0007】この発明で用いられるエチレン−α−オレ
フィン共重合体は、0.925g/cm3 以下の密度を有
するものである。このようなエチレン−α−オレフィン
共重合体は、たとえば、α−オレフィンが10〜70モ
ル%程度になるような割合でエチレンとα−オレフィン
とを共重合させることにより得ることができる。α−オ
レフィンとしては、特に限定はされないが、たとえば、
プロピレン、1−ブテン、1−ペンテン、1−ヘキセ
ン、4−メチル−1−ペンテン、1−オクテン等が挙げ
られる。これらの中でも特に好ましいのは、プロピレン
である。
The ethylene-α-olefin copolymer used in the present invention has a density of 0.925 g / cm 3 or less. Such an ethylene-α-olefin copolymer can be obtained, for example, by copolymerizing ethylene and an α-olefin in a ratio such that the α-olefin is about 10 to 70 mol%. The α-olefin is not particularly limited, but for example,
Propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and the like can be mentioned. Of these, propylene is particularly preferable.

【0008】この発明で用いられる油性物質としては、
エチレン−α−オレフィン共重合体と相溶性を有するも
のが望ましく、その具体例としては、特に限定はされな
いが、たとえば、ハイドロカーボン(パラフィン、パラ
フィンワックス等)、脂肪酸および脂肪酸エステル等が
挙げられる。これらは、1種のみを用いてもよいし、2
種以上を併用してもよい。油性物質は、20cal/g
以上の融解熱量を有する結晶性物質であることが好まし
い。このような油性物質を用いた場合、蓄熱量の大きい
繊維が得られるからである。また、油性物質の融点は、
90℃以上であることが好ましい。
The oily substance used in the present invention is
Those having compatibility with the ethylene-α-olefin copolymer are desirable, and specific examples thereof are not particularly limited, and examples thereof include hydrocarbons (paraffin, paraffin wax, etc.), fatty acids, fatty acid esters and the like. These may use only 1 type and 2
You may use together 1 or more types. Oily substance is 20 cal / g
A crystalline substance having the above heat of fusion is preferable. This is because when such an oily substance is used, fibers having a large heat storage amount can be obtained. Also, the melting point of the oily substance is
It is preferably 90 ° C. or higher.

【0009】超高分子量ポリエチレンとエチレン−α−
オレフィン共重合体と油性物質との配合比は、蓄熱組成
物の用途等に応じて適宜設定され、特に限定はされない
が、たとえば、油性物質の担持能力と蓄熱組成物の強度
確保の点からは、組成物全体に対して、超高分子量ポリ
エチレンが3重量%以上、超高分子量ポリエチレンとエ
チレン−α−オレフィン共重合体との合計が10重量%
以上であることが望ましい。蓄熱体として使用する場合
は、蓄熱性能および担持性能の確保の点から、組成物全
体に対して、超高分子量ポリエチレンが3〜20重量
%、超高分子量ポリエチレンとエチレン−α−オレフィ
ン共重合体との合計が10〜50重量%、油性物質が5
0〜90重量%であることが望ましい。油性物質の比率
が上記範囲を上回ると、油性物質のしみ出し量が増大す
る恐れがあり、油性物質の比率が上記範囲を下回ると、
蓄熱量が低過ぎる恐れがあるからである。
Ultra high molecular weight polyethylene and ethylene-α-
The mixing ratio of the olefin copolymer and the oily substance is appropriately set depending on the application of the heat storage composition and the like, and is not particularly limited, but from the viewpoint of, for example, the ability to carry the oily substance and the strength of the heat storage composition. , 3% by weight or more of ultra-high molecular weight polyethylene, and 10% by weight of the total of ultra-high molecular weight polyethylene and ethylene-α-olefin copolymer, based on the entire composition
The above is desirable. When used as a heat storage material, from the viewpoint of securing heat storage performance and supporting performance, 3 to 20% by weight of ultrahigh molecular weight polyethylene, ultrahigh molecular weight polyethylene and ethylene-α-olefin copolymer relative to the entire composition. And the total of 10 to 50% by weight, and the oily substance is 5
It is preferably 0 to 90% by weight. When the ratio of the oily substance exceeds the above range, the exudation amount of the oily substance may increase, and when the ratio of the oily substance falls below the above range,
This is because the heat storage amount may be too low.

【0010】超高分子量ポリエチレンとエチレン−α−
オレフィン共重合体とからなる基質樹脂中に油性物質を
分散させる方法としては、特に限定はされないが、たと
えば、超高分子量ポリエチレンの融点以上の温度で混練
機(ニーダー)等で混練する方法等が好ましい。この方
法によれば、均一な組成物を得ることができるからであ
る。混練後は、押出機等を用い、ペレット状、ストラン
ド状、フィルム状、シート状、ネット状等の形状に成形
したり、紡糸により繊維化して用いられる。
Ultra high molecular weight polyethylene and ethylene-α-
The method of dispersing the oily substance in the substrate resin composed of the olefin copolymer is not particularly limited, but for example, a method of kneading with a kneader (kneader) or the like at a temperature equal to or higher than the melting point of ultrahigh molecular weight polyethylene, etc. preferable. This is because according to this method, a uniform composition can be obtained. After kneading, an extruder or the like is used to form pellets, strands, films, sheets, nets, or the like, or fibers are formed by spinning.

【0011】[0011]

【作用】この発明では、蓄熱材である油性物質を分散さ
せる基質樹脂として、重量平均分子量が1×106 以上
の超高分子量ポリエチレンと密度が0.925g/cm3
以下のエチレン−α−オレフィン共重合体とを用いるよ
うにしている。すると、上記エチレン−α−オレフィン
共重合体の使用により、油性物質のしみ出しが少なくな
る。そのため、特に繊維化する際に、しみ出し防止樹脂
層を繊維の表面に形成させる必要がなくなる。もしも、
密度が上記特定範囲を上回るエチレン−α−オレフィン
共重合体を用いた場合は、油性物質のしみ出しを抑える
効果が低下する。
In this invention, as the substrate resin for dispersing the oily substance as the heat storage material, the ultrahigh molecular weight polyethylene having a weight average molecular weight of 1 × 10 6 or more and the density of 0.925 g / cm 3 are used.
The following ethylene-α-olefin copolymer is used. Then, the use of the ethylene-α-olefin copolymer reduces oozing of the oily substance. Therefore, it is not necessary to form the exudation preventing resin layer on the surface of the fiber particularly when the fiber is formed. If,
When an ethylene-α-olefin copolymer having a density exceeding the above specified range is used, the effect of suppressing the exudation of the oily substance decreases.

【0012】また、上記超高分子量ポリエチレンの使用
により、高弾性で、しかも強度の強い繊維化が可能にな
る。もしも、重量平均分子量が上記特定範囲を下回るポ
リエチレンを用いた場合は、溶解は容易であるが、延伸
しても高強度、高弾性の蓄熱繊維が得られにくくなる。
Further, by using the above-mentioned ultra high molecular weight polyethylene, it is possible to form a fiber having high elasticity and high strength. If polyethylene having a weight average molecular weight below the above specified range is used, it is easy to dissolve, but it becomes difficult to obtain a high-strength and high-elasticity heat storage fiber even if it is stretched.

【0013】[0013]

【実施例】次に、この発明の実施例を比較例と併せて示
すが、この発明は、下記実施例に限定されない。以下の
実施例および比較例1〜2で用いた超高分子量ポリエチ
レン、高密度ポリエチレン、エチレン−α−オレフィン
共重合体および油性物質は、以下の通りである。
EXAMPLES Next, examples of the present invention will be shown together with comparative examples, but the present invention is not limited to the following examples. The ultra high molecular weight polyethylene, high density polyethylene, ethylene-α-olefin copolymer and oily substance used in the following Examples and Comparative Examples 1 and 2 are as follows.

【0014】超高分子量ポリエチレンは、ハイゼックス
ミリオン240M(三井石油化学工業株式会社製、密度
0.936g/cm3 、重量平均分子量2.3×106
である。高密度ポリエチレンは、SHOLEX6006
(昭和電工株式会社製、密度0.957g/cm3 )であ
る。
Ultra high molecular weight polyethylene is HiZex Million 240M (manufactured by Mitsui Petrochemical Co., Ltd., density 0.936 g / cm 3 , weight average molecular weight 2.3 × 10 6 ).
Is. High-density polyethylene is SHOLEX6006
(Showa Denko KK, density 0.957 g / cm 3 ).

【0015】エチレン−α−オレフィン共重合体は、タ
フマーP0880(三井石油化学工業株式会社製、エチ
レン−プロピレン共重合体、密度0.870g/cm3
である。油性物質は、ハイドロカーボンであるパラフィ
ン135品(日本精蝋株式会社製、融点58℃、融解熱
量47.5cal/g)である。
The ethylene-α-olefin copolymer is Tuffmer P0880 (Mitsui Petrochemical Co., Ltd., ethylene-propylene copolymer, density 0.870 g / cm 3 ).
Is. The oily substance is 135 paraffin that is a hydrocarbon (manufactured by Nippon Seiro Co., Ltd., melting point 58 ° C., heat of fusion 47.5 cal / g).

【0016】−実施例− 超高分子量ポリエチレン10部(重量部、以下同じ)、
エチレン−プロピレン共重合体20部およびパラフィン
70部を140℃に加熱しながらニーダー(株式会社栗
本鉄工所製、S1.5型)で混練して、所定の混合比率
の均一な蓄熱組成物を作製した。混練した蓄熱組成物
は、冷却速度1℃/分で冷却を行った後、ペレット状
(直径1mm、長さ2mm)および延伸によりストランド状
(650デニール、直径0.3mm)に成形した。
-Example- 10 parts by weight of ultra high molecular weight polyethylene (parts by weight, the same applies hereinafter),
20 parts of an ethylene-propylene copolymer and 70 parts of paraffin are kneaded with a kneader (S1.5 type manufactured by Kurimoto Iron Works Co., Ltd.) while heating at 140 ° C. to prepare a uniform heat storage composition having a predetermined mixing ratio. did. The kneaded heat storage composition was cooled at a cooling rate of 1 ° C./min, and then formed into pellets (diameter 1 mm, length 2 mm) and by stretching into strands (650 denier, diameter 0.3 mm).

【0017】−比較例1− 超高分子量ポリエチレン20部およびパラフィン80部
を実施例と同様にして混練して蓄熱組成物を作製し、成
形した。 −比較例2− 高密度ポリエチレン10部、エチレン−プロピレン共重
合体20部およびパラフィン70部を実施例と同様にし
て混練して蓄熱組成物を作製し、成形した。
-Comparative Example 1- 20 parts of ultra high molecular weight polyethylene and 80 parts of paraffin were kneaded in the same manner as in the example to prepare a heat storage composition and molding. -Comparative Example 2- 10 parts of high-density polyethylene, 20 parts of ethylene-propylene copolymer and 70 parts of paraffin were kneaded in the same manner as in the example to prepare a heat storage composition, and molded.

【0018】上記実施例および比較例1〜2で作製した
ペレット状蓄熱組成物について、図1に示す温度条件の
雰囲気中で200サイクルの寒熱試験を行った。試験
後、蓄熱組成物を取り出し、油性物質の融点以上の温度
(80℃)で蓄熱組成物の周囲にしみ出した油性物質を
拭き取り、減少した重量から、油性物質のしみ出し率を
計測した。
The pellet-shaped heat storage compositions prepared in the above Examples and Comparative Examples 1 and 2 were subjected to a 200-cycle cold heat test in an atmosphere under the temperature conditions shown in FIG. After the test, the heat storage composition was taken out, the oily substance exuded around the heat storage composition at a temperature (80 ° C.) higher than the melting point of the oily substance was wiped off, and the exudation rate of the oily substance was measured from the reduced weight.

【0019】ここで、油性物質のしみ出し率は、下記関
係式(I)に従って求めたものである。 しみ出し率(%)=(蓄熱組成物の重量減少量/初期の油性物質含有量) ×100 …(I) その結果、各蓄熱組成物からの油性物質のしみ出し率
は、以下の通りであった。
Here, the exudation rate of the oily substance is obtained according to the following relational expression (I). Bleed rate (%) = (weight reduction amount of heat storage composition / initial oily substance content) × 100 (I) As a result, the boilout rate of the oily substance from each heat storage composition is as follows. there were.

【0020】実施例 …0.53% 比較例1…21% 比較例2…0.42% この結果にみるように、実施例の蓄熱組成物からの油性
物質のしみ出し率は、比較例2と同等であったが、比較
例1の1/30以下となり、非常に低いものであった。
Example ... 0.53% Comparative Example 1 ... 21% Comparative Example 2 ... 0.42% As can be seen from these results, the exudation rate of the oily substance from the heat storage composition of the Example is Comparative Example 2 However, it was 1/30 or less of that of Comparative Example 1, which was extremely low.

【0021】また、蓄熱組成物をストランド状に成形し
た場合、実施例では、比較例2に比べて高強度かつ高弾
性のストランドが得られた。
Further, when the heat storage composition was formed into a strand, in the example, a strand having higher strength and higher elasticity than that of the comparative example 2 was obtained.

【0022】[0022]

【発明の効果】この発明にかかる蓄熱組成物は、蓄熱材
である油性物質のしみ出しが非常に少なく、蓄熱性能に
優れるとともに、特に、繊維化した場合、弾性が高く、
強度の強い蓄熱繊維を得ることができる。
EFFECTS OF THE INVENTION The heat storage composition according to the present invention has very little oozing out of the oily substance which is a heat storage material, and is excellent in heat storage performance.
It is possible to obtain a heat storage fiber having high strength.

【図面の簡単な説明】[Brief description of drawings]

【図1】実施例および比較例1〜2の蓄熱組成物に対す
る寒熱試験の温度条件を表すグラフである。
FIG. 1 is a graph showing temperature conditions of a cold heat test for heat storage compositions of Examples and Comparative Examples 1 and 2.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 清 三喜男 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 前田 太 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 鶴来 充啓 大阪府門真市大字門真1048番地松下電工株 式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Kiyozo 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Inventor, Tai Maeda, 1048, Kadoma, Kadoma City, Osaka Matsushita Electric Co., Ltd. 72) Inventor Mitsuhiro Tsurugi 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 基質樹脂中に油性物質が分散した状態で
含まれてなる蓄熱組成物であって、前記基質樹脂が、重
量平均分子量が1×106 以上の超高分子量ポリエチレ
ンと密度が0.925g/cm3 以下のエチレン−α−オ
レフィン共重合体とからなるものであることを特徴とす
る蓄熱組成物。
1. A heat storage composition comprising an oily substance dispersed in a matrix resin, wherein the matrix resin has an ultrahigh molecular weight polyethylene having a weight average molecular weight of 1 × 10 6 or more and a density of 0. A heat storage composition comprising: an ethylene-α-olefin copolymer of 925 g / cm 3 or less.
【請求項2】 油性物質が、ハイドロカーボン、脂肪酸
および脂肪酸エステルからなる群の中から選ばれた少な
くとも1種である請求項1記載の蓄熱組成物。
2. The heat storage composition according to claim 1, wherein the oily substance is at least one selected from the group consisting of hydrocarbons, fatty acids and fatty acid esters.
【請求項3】 油性物質が、20cal/g以上の融解
熱量を有する結晶性物質である請求項1または2記載の
蓄熱組成物。
3. The heat storage composition according to claim 1, wherein the oily substance is a crystalline substance having a heat of fusion of 20 cal / g or more.
【請求項4】 油性物質が、90℃以下の融点を有する
ものである請求項1から3までのいずれかに記載の蓄熱
組成物。
4. The heat storage composition according to claim 1, wherein the oily substance has a melting point of 90 ° C. or lower.
JP4219349A 1992-08-18 1992-08-18 Heat storage composition Pending JPH0665565A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4219349A JPH0665565A (en) 1992-08-18 1992-08-18 Heat storage composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4219349A JPH0665565A (en) 1992-08-18 1992-08-18 Heat storage composition

Publications (1)

Publication Number Publication Date
JPH0665565A true JPH0665565A (en) 1994-03-08

Family

ID=16734061

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4219349A Pending JPH0665565A (en) 1992-08-18 1992-08-18 Heat storage composition

Country Status (1)

Country Link
JP (1) JPH0665565A (en)

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