KR101262307B1 - Chlorinated polyethylene resin and molded article manufactured using composition having the resin - Google Patents

Abstract

The present invention relates to a chlorinated polyethylene resin, and more particularly, to a chlorinated polyethylene resin in which chlorine is bonded to at least some of repeating units of the polyethylene resin, wherein the polyethylene resin has a melt flow index (load 5kg, 190 ° C: MI ₅ ). Is 0.1 to 0.5 g / 10min, a melt flow ratio (MFR: MI _21.6 / MI ₅ , 190 ° C) is 15 to 30, and the chlorine is bound to an amount of 20 to 30% by weight relative to the chlorinated polyethylene resin. Polyethylene resins; A method for producing the resin; It relates to a composition comprising the resin and a molded article obtained by curing the composition.
The chlorinated polyethylene resin according to the present invention has excellent plasticization and impact resistance properties for polyvinyl chloride resin, and thus may be usefully used as an impact modifier.

Description

CHLORINATED POLYETHYLENE RESIN AND MOLDED ARTICLE MANUFACTURED USING COMPOSITION HAVING THE RESIN}

The present invention relates to a molded article formed by a chlorinated polyethylene resin and a composition comprising the same.

Hard polyvinyl chloride (PVC) resin is widely used as a material for various industrial materials such as window materials, pipes, siding. Since the polyvinyl chloride resin has a glass transition temperature (Tg) of about 82 ° C., the polyvinyl chloride resin is vulnerable to impact and exhibits brittle characteristics at room temperature. Accordingly, impact reinforcing agents such as acrylic resin (ACR), methacrylate-butadiene-styrene (MBS), and chlorinated polyethylene (CPE) resins are generally added to reinforce the impact strength during processing of the polyvinyl chloride resin.

The chlorinated polyethylene resin in the impact modifier is prepared by the chlorination substitution reaction of polyethylene. In general, polyethylene resins have a high degree of crystallinity. When hydrogen is replaced by chlorine in polyethylene resins, crystallinity is destroyed due to differences in atomic volumes. As a result, the more evenly distributed the chlorine, the more the amorphous region of the polyethylene resin gradually increases, the less the hard properties and the smoother the change. These chlorinated polyethylene resins are structurally similar to polyvinyl chloride resins, and thus have high compatibility and low cost, and thus are used as the most common impact modifiers.

However, the chlorinated polyethylene resin has a disadvantage of low transparency, high density, and long plasticization time, compared to other impact modifiers such as ACR and MBS. In addition, the chlorinated polyethylene has a lower impact resistance improvement effect than other impact modifiers such as ACR, MBS, and is used in combination with other impact modifiers rather than being used alone.

Thus, studies to improve the physical properties of the chlorinated polyethylene resin has been actively conducted, but the degree is still insufficient.

Accordingly, the present invention is to provide a chlorinated polyethylene resin that can exhibit a impact reinforcing effect equivalent to the previous impact reinforcing agent even when used alone, and can shorten the plasticization time for the polyvinyl chloride resin.

Moreover, this invention is providing the manufacturing method of the said chlorinated polyethylene resin.

Moreover, this invention is providing the composition containing the said chlorinated polyethylene resin, and the molded article obtained by hardening | curing the said composition.

The invention, according to one embodiment,

A chlorinated polyethylene resin in which chlorine is bonded to at least part of repeating units of the polyethylene resin,

The polyethylene resin has a melt flow index (load 5kg, 190 ℃: MI ₅ ) is 0.1 to 0.5 g / 10min, melt flow ratio (MFR: MI _21.6 / MI ₅ , 190 ℃) is 15 to 30,

The chlorine provides a chlorinated polyethylene resin which is bound in an amount of 20 to 30% by weight relative to the chlorinated polyethylene resin.

Here, the polyethylene resin may be at least one selected from the group consisting of low density polyethylene, linear low density polyethylene, linear medium density polyethylene, high density polyethylene, and modified polyethylene.

In addition, the chlorinated polyethylene resin may be the heat of fusion (heat of fusion) to the crystal region of 0 to 2 J / g.

Meanwhile, according to another embodiment of the present invention,

A composition comprising a polyethylene resin having a melt flow index (load 5 kg, 190 ° C .: MI ₅ ) of 0.1 to 0.5 g / 10 min and a melt flow ratio (MFR: MI _{21 .6} / MI ₅ , 190 ° C.) of 15 to 30. Preparing a; And

Chlorine substitution reaction by adding chlorine to the composition

It provides a method for producing the chlorinated polyethylene resin comprising a.

At this time, the chlorine substitution reaction step is carried out so that the substitution amount of chlorine to 10 to 15% by weight based on the total weight of the chlorinated polyethylene resin under 90 to 120 ℃; Under 110 to 130 ° C., the total substitution of chlorine may be performed at 20 to 30% by weight.

Meanwhile, the present invention provides a resin composition comprising the chlorinated polyethylene resin and the polyvinyl chloride resin according to another embodiment.

The resin composition may include 1 to 20 parts by weight of the chlorinated polyethylene resin based on 100 parts by weight of polyvinyl chloride resin.

Moreover, this invention provides the molded article obtained by hardening | curing the said resin composition.

The chlorinated polyethylene resin according to the present invention may exhibit an equivalent or more impact reinforcing effect as compared to acrylic resin (ACR), methacrylate-butadiene-styrene (MBS), chlorinated polyethylene resin, etc., which are previous impact modifiers, even when used alone. The plasticization time for the polyvinyl chloride resin can be shortened.

Hereinafter, a chlorinated polyethylene resin, a method for preparing the resin, a composition containing the resin, and a molded article obtained by curing the composition according to embodiments of the present invention will be described.

In the course of continuing research on chlorinated polyethylene resins, the inventors have adjusted chlorine content and distribution to specific ranges for polyethylene resins having a specific range of melt flow index (MFI) and melt flow ratio (MFR). When controlling the degree of crystallinity, it was confirmed that even when used alone, the impact reinforcing effect can be equal to or higher than that of the previous impact modifier, and the plasticization time for the polyvinyl chloride resin can be shortened, thereby completing the present invention.

The invention as such, in accordance with one embodiment,

A chlorinated polyethylene resin in which chlorine is bonded to at least part of repeating units of the polyethylene resin,

The polyethylene resin has a melt flow index (load 5kg, 190 ℃: MI ₅ ) is 0.1 to 0.5 g / 10min, melt flow ratio (MFR: MI _21.6 / MI ₅ , 190 ℃) is 15 to 30,

The chlorine provides a chlorinated polyethylene resin which is bound in an amount of 20 to 30% by weight relative to the chlorinated polyethylene resin.

The chlorinated polyethylene resin is a resin in which chlorine is substituted at a hydrogen position of at least some of the repeating units of the polyethylene resin, and the crystallinity of the polyethylene resin is lowered due to the atomic volume difference between hydrogen and chlorine, and the resin has an amorphous region formed thereon.

Here, the kind of the polyethylene resin may be conventional in the art. Just preferably, the polyethylene resin may be at least one selected from the group consisting of low density polyethylene, linear low density polyethylene, linear medium density polyethylene, high density polyethylene and modified polyethylene; More preferably high density polyethylene.

In particular, according to the present invention, the polyethylene resin has a melt flow index (Melt Flow Index, MI ₅ ) under a load of 5kg and 190 ℃ 0.1 to 0.5 g / 10min, Melt Flow Rate (load 21.6 kg / The load 5 kg, 190 ° C, MI _{21 .6} / MI ₅ ) may be 15 to 30.

The melt flow index is a physical property exhibiting properties inversely proportional to the molecular weight of the polyethylene resin, the polyethylene resin according to the present invention has a melt flow index (MI ₅ ) of 0.1 to 0.5 g / 10min under a load of 5 kg and 190 ℃, preferably May be 0.2 to 0.5 g / 10 min, more preferably 0.2 to 0.4 g / 10 min.

That is, in order to ensure the minimum fluidity and dispersibility in the polyvinyl resin required for the chlorinated polyethylene resin according to the present invention, it is preferable that the MI ₅ of the polyethylene resin is 0.1 g / 10 min or more. On the contrary, if the MI ₅ of the polyethylene resin is higher than necessary, there is a chlorinated polyethylene elasticity be less impact reinforcing effect is decreased, it is preferable that the MI ₅ 0.5 g / 10min or less of the polyethylene resin in order to prevent this.

On the other hand, the melt flow ratio is a ratio of the melt flow index MI _{21 .6} (melt flow index under load 21.6 kg and 190 ℃) and MI ₅ (melt flow index under load 5 kg and 190 ℃) which is proportional to the molecular weight distribution As represented by, the polyethylene resin according to the present invention may have a melt flow ratio (MI _21.6 / MI ₅ ) of 15 to 30, preferably 15 to 25, more preferably 15 to 20.

That is, in order to ensure the minimum fluidity required for the chlorinated polyethylene resin according to the present invention to shorten the plasticization time when kneading with the polyvinyl chloride resin, MI _{21 .6} / MI ₅ is preferably not less than 15. In addition, when the melt flow ratio of the polyethylene resin is higher than necessary, the stickiness of the chlorinated polyethylene may increase, resulting in poor workability and deterioration in mechanical properties. In order to prevent this, MI _{21 .6} / MI ₅ of the polyethylene resin is 30 or less. desirable.

In addition, the chlorinated polyethylene resin according to the present invention may be 20 to 30% by weight, preferably 25 to 30% by weight relative to the total weight of the chlorinated polyethylene resin chlorine content substituted in the polyethylene resin.

That is, in order to ensure the minimum elasticity and miscibility with the polyvinyl chloride resin required for the chlorinated polyethylene resin according to the present invention, the content of chlorine substituted in the chlorinated polyethylene resin is added to the total weight of the chlorinated polyethylene resin. It is preferable that it is 20 weight% or more with respect to. In addition, when the content of the substituted chlorine is higher than necessary, the glass transition temperature of the chlorinated polyethylene resin may be increased and thus the low temperature impact property may be lowered. In order to prevent this, the content of the chlorine substituted by the chlorinated polyethylene resin is It is preferable that it is 30 weight% or less with respect to the total weight of resin.

In particular, the chlorinated polyethylene resin according to the present invention has a heat of fusion to a crystal region of 2 J / g or less, preferably 0 to 2 J / g, more preferably 0 to 1.5 J / g. Can be.

The crystal region of the chlorinated polyethylene resin is a portion formed by crystallization of a portion in which the chlorination substitution reaction of polyethylene is not performed, and the degree of crystallinity is proportional to the heat of fusion measured by differential scanning calorimetry. For example, for polyethylene with 100% crystallinity, the heat of fusion for the crystalline region is about 290 J / g; for amorphous, the heat of fusion for the crystalline region is OJ / g. .

However, the crystal region of the chlorinated polyethylene is not directly proportional to the amount of chlorine introduced, and the ratio may vary depending on the conditions of the chlorination substitution reaction. That is, even if the content of chlorine introduced through the chlorination substitution reaction is the same, the distribution of chlorine may vary according to the conditions of the substitution reaction, etc., the more chlorine is distributed evenly, the crystallinity of polyethylene may be evenly destroyed, and accordingly The heat of fusion to the area may appear low. In contrast, even if the chlorine content is the same, the crystalline region and the heat of melting thereof may be relatively high when chlorine is not evenly distributed.

Therefore, the chlorinated polyethylene resin according to the present invention preferably has a heat of fusion of 2 J / g or less for the crystal region in order to lower the crystal region to ensure low temperature impact characteristics and compatibility with the polyvinyl chloride resin.

As described above, the chlorinated polyethylene resin according to the present invention includes a polyethylene resin satisfying the above physical property range and chlorine substituted in the optimal range in the polyethylene resin, and thus acrylic resin (ACR), which is a previous impact reinforcing agent alone, Compared with methacrylate-butadiene-styrene (MBS), chlorinated polyethylene resins, etc., the impact reinforcing effect can be exhibited equal to or higher, and the plasticization time for the polyvinyl chloride resin can be shortened.

Meanwhile, according to another embodiment of the present invention,

A composition comprising a polyethylene resin having a melt flow index (load 5 kg, 190 ° C .: MI ₅ ) of 0.1 to 0.5 g / 10 min and a melt flow ratio (MFR: MI _{21 .6} / MI ₅ , 190 ° C.) of 15 to 30. Preparing a; And

Chlorine substitution reaction by adding chlorine to the composition

It provides a method for producing the chlorinated polyethylene resin comprising a.

The chlorinated polyethylene resin may be prepared by a method of performing a chlorine substitution reaction with respect to a composition (aqueous suspension phase or hydrochloric acid suspension phase) containing a polyethylene resin satisfying the above-described physical property range.

In this case, the polyethylene resin may be manufactured and used to satisfy the above physical properties, or may use commercial items.

In order to manufacture the polyethylene resin satisfying the above physical properties, one reactor may be used, or two or more reactors may be connected in series or in parallel. In the case of using one of the reactors by adjusting the type and amount of the catalyst can be produced a polyethylene resin that satisfies the above properties. In addition, in the case of using two or more reactors connected in series, it is possible to produce a polyethylene resin that satisfies the above properties by controlling the amount of hydrogen vented between the reactors. In addition, in the case of using two or more reactors connected in parallel, by adjusting the amount of hydrogen and catalyst used in the polymerization and the difference in the melt flow index of the resin formed in each reactor it can be produced a polyethylene resin that satisfies the above properties have.

In particular, according to the present invention, the chlorine substitution reaction step is carried out at 90 to 120 ℃, so that the substitution amount of chlorine to 10 to 15% by weight relative to the total weight of the chlorinated polyethylene resin; It is preferably carried out at 110 to 130 ° C. such that the total substitution of chlorine is 20 to 30% by weight. That is, by performing the chlorine substitution reaction step by the above method, it is preferable in that it can evenly distribute the chlorine to be substituted and to prepare chlorinated polyethylene having optimum physical properties.

In addition, the method for producing chlorinated polyethylene according to the present invention, in addition to the above-described steps, may be carried out further including the steps that can be conventionally carried out in the art before or after each of the above steps, One step does not limit the manufacturing method of the present invention.

Meanwhile, the present invention provides a resin composition comprising the above-described chlorinated polyethylene resin and polyvinyl chloride resin according to another embodiment.

In this case, the resin composition may include 1 to 20 parts by weight, preferably 3 to 15 parts by weight, and more preferably 5 to 10 parts by weight, based on 100 parts by weight of the polyvinyl chloride resin.

That is, in order to secure a minimum impact resistance improvement effect, the chlorinated polyethylene resin is preferably included 1 part by weight or more based on 100 parts by weight of polyvinyl chloride resin. In addition, when an excessive amount of chlorinated polyethylene resin is added, it may be softened more than necessary to degrade mechanical properties. To prevent this, the chlorinated polyethylene resin is included in an amount of 20 parts by weight or less based on 100 parts by weight of polyvinyl chloride resin. It is preferable to be.

In addition to the above components, the resin composition may further include additives commonly used in the art to which the present invention pertains. For example, in the composition of the present invention, additives such as lead-based or calcium-zinc-based heat stabilizers, pigments such as titanium oxide (TiO ₂ ), fillers such as calcium carbonate (CaCO ₃ ), and the like may be added to the molded article. May be further included. At this time, the content of the additive is not particularly limited because it can be determined in various ranges without lowering the physical properties of the composition and the molded article according to the present invention.

On the other hand, the present invention, according to another embodiment, provides a molded article obtained by curing the above-mentioned resin composition.

The molded article has an advantage of excellent impact strength as obtained from a composition comprising a chlorinated polyethylene resin according to the present invention.

Therefore, the molded article according to the present invention can be usefully used in various industrial fields such as window materials, pipes, siding (siding) and the like.

Best Mode for Carrying Out the Invention Hereinafter, preferred embodiments are described to facilitate understanding of the present invention. However, the following examples are intended to illustrate the present invention without limiting it thereto.

Example  One

(Production of Chlorinated Polyethylene)

Powdery high density polyethylene (manufacturer: Honam Petrochemical Co., Ltd., product name: HIVOREX, weight average with MI ₅ (load 5kg, 190 ° C) of 0.3 g / 10min and MI _{21 .6} / MI ₅ (190 ° C) of 19) Molecular weight: 410,000). 2 kg of polyethylene and 16 L of an aqueous hydrochloric acid solution (20 wt% aqueous hydrochloric acid solution) were added to the reactor (20 L), stirred, and heated to 110 ° C.

Into the reactor, chlorine gas was introduced at 110 ° C. until the chlorine content became 11.4 wt% based on the total weight of the chlorinated polyethylene resin. Subsequently, the chlorine supply was stopped and heated to 120 ° C., followed by the introduction of chlorine gas to proceed with the second chlorine substitution reaction until the total chlorine content was 25% by weight based on the total weight of the chlorinated polyethylene resin.

After the chlorine substitution reaction, powdered chlorinated polyethylene was obtained through dehydrochloric acid, washing with water and drying.

(Preparation of resin composition)

To 100 parts by weight of polyvinyl chloride resin (manufacturer: Hanwha Chemical Co., Ltd., polymerization degree: 1000), 6 parts by weight of chlorinated polyethylene prepared above, 5 parts by weight of potassium-zinc-based composite stabilizer as an additive, 4 parts by weight of titanium oxide, and 5 parts by weight of calcium carbonate was blended to prepare a resin composition.

Example  2

(Production of Chlorinated Polyethylene)

Powdered chlorinated polyethylene was prepared in the same manner and in the same manner as in Example 1.

(Preparation of resin composition)

A resin composition was prepared in the same manner and in the same manner as in Example 1, except that the chlorinated polyethylene was added in an amount of 7 parts by weight based on 100 parts by weight of the polyvinyl chloride resin.

Example  3

(Production of Chlorinated Polyethylene)

In the second chlorine substitution reaction step of Example 1, the same methods and conditions as in Example 1 except that the chlorine substitution reaction was carried out until the total content of chlorine is 30% by weight relative to the total weight of the chlorinated polyethylene resin Powdery chlorinated polyethylene was prepared.

(Preparation of resin composition)

A resin composition was prepared in the same manner and in the same manner as in Example 1.

Example  4

(Production of Chlorinated Polyethylene)

In the second chlorine substitution reaction step of Example 1, the same methods and conditions as in Example 1 except that the chlorine substitution reaction was carried out until the total content of chlorine is 30% by weight relative to the total weight of the chlorinated polyethylene resin Powdery chlorinated polyethylene was prepared.

(Preparation of resin composition)

A resin composition was prepared in the same manner and in the same manner as in Example 1, except that the chlorinated polyethylene was added in an amount of 7 parts by weight based on 100 parts by weight of the polyvinyl chloride resin.

Comparative example  One

(Production of Chlorinated Polyethylene)

In the second chlorine substitution reaction step of Example 1, the same methods and conditions as in Example 1, except that the chlorine substitution reaction was carried out until the total content of chlorine is 35% by weight relative to the total weight of the chlorinated polyethylene resin Powdery chlorinated polyethylene was prepared.

(Preparation of resin composition)

A resin composition was prepared in the same manner and in the same manner as in Example 1.

Comparative example  2

(Production of Chlorinated Polyethylene)

In the second chlorine substitution reaction step of Example 1, the same methods and conditions as in Example 1, except that the chlorine substitution reaction was carried out until the total content of chlorine is 35% by weight relative to the total weight of the chlorinated polyethylene resin Powdery chlorinated polyethylene was prepared.

(Preparation of resin composition)

A resin composition was prepared in the same manner and in the same manner as in Example 1, except that the chlorinated polyethylene was added in an amount of 7 parts by weight based on 100 parts by weight of the polyvinyl chloride resin.

Comparative example  3

(Production of Chlorinated Polyethylene)

In Example 1, powdery high density polyethylene (manufacturer: Honam Petrochemical Co., Ltd.) having a MI ₅ (load 5 kg, 190 ° C.) of 0.7 g / 10 min and a MI _21.6 / MI ₅ (190 ° C.) of 12 as a raw material Product name: HIVOREX, weight average molecular weight: 300,000); In the second chlorine substitution reaction step of Example 1, the same methods and conditions as in Example 1, except that the chlorine substitution reaction was carried out until the total content of chlorine is 35% by weight relative to the total weight of the chlorinated polyethylene resin Powdery chlorinated polyethylene was prepared.

(Preparation of resin composition)

A resin composition was prepared in the same manner and in the same manner as in Example 1.

Comparative example  4

(Production of Chlorinated Polyethylene)

In Example 1, powdery high density polyethylene (manufacturer: Honam Petrochemical Co., Ltd.) having a MI ₅ (load 5 kg, 190 ° C.) of 0.7 g / 10 min and a MI _21.6 / MI ₅ (190 ° C.) of 12 as a raw material Product name: HIVOREX, weight average molecular weight: 300,000); In the second chlorine substitution reaction step of Example 1, the same methods and conditions as in Example 1, except that the chlorine substitution reaction was carried out until the total content of chlorine is 35% by weight relative to the total weight of the chlorinated polyethylene resin Powdery chlorinated polyethylene was prepared.

(Preparation of resin composition)

A resin composition was prepared in the same manner as in Example 1, except that the chlorinated polyethylene was added in an amount of 7 parts by weight based on 100 parts by weight of the polyvinyl chloride resin.

Comparative example  5

(Preparation of resin composition)

6 parts by weight of methacrylate-butadiene-styrene (MBS, manufacturer: LG Chemicals, product name: MB838A) based on 100 parts by weight of polyvinyl chloride resin (manufacturer: Hanwha Chemical Co., Ltd., polymerization degree: 1000) As a result, 5 parts by weight of potassium-zinc composite stabilizer, 4 parts by weight of titanium oxide, and 5 parts by weight of calcium carbonate were blended to prepare a resin composition.

Comparative example  6

(Preparation of resin composition)

7 parts by weight of methacrylate-butadiene-styrene (MBS, manufacturer: LG Chemicals, product name: MB838A) with respect to 100 parts by weight of polyvinyl chloride resin (manufacturer: Hanwha Chemical Co., Ltd., polymerization degree: 1000) As a result, 5 parts by weight of a potassium-zinc composite stabilizer, 4 parts by weight of titanium oxide, and 5 parts by weight of calcium carbonate were blended to prepare a resin composition.

Test Example

One. Heat of fusion  Measure

: For the chlorinated polyethylene resins prepared in Examples 1, 3, Comparative Example 1, and Comparative Example 3, the heat of fusion was measured using a differential scanning calorimeter (TA Instruments, DSC Q200), and the results are described below. Table 1 shows.

sample Polyethylene Chlorine content
(weight%) Melting heat
(J / g) MI ₅ (g / 10min) MI _{21 .6} / MI ₅ Example 1 0.3 19 25 1.3 Example 3 0.3 19 30 0.9 Comparative Example 1 0.3 19 35 2.1 Comparative Example 3 0.7 12 35 2.3

2. Plasticization  Time measurement

: Plasticization time for each resin composition according to Examples 1 to 4 and Comparative Examples 1 to 6 was measured, and the results are shown in Table 2 below.

In this case, the plasticization time is measured, after the resin composition is put into a batch mixer (Rheomix 600P), and under the conditions of kneading temperature 180 ℃, rotation speed 300 rpm, after the first maximum torque generated during kneading, the second maximum torque It was performed by measuring the time required until the occurrence.

3. PVC  For pipe Fall ( Falling Weight A) impact strength measurement

: After pipe-forming using the respective resin compositions according to Examples 1 to 4 and Comparative Examples 1 to 6, the fall impact strength on the specimen was measured, and the results are shown in Table 2 below.

At this time, in order to measure the fall impact strength, pipe specimens each having an outer diameter of 32 mm and a thickness of 1.7 mm were manufactured using a pipe molding machine. The specimen was impacted by dropping a weight of 2 kg at a height of 1.5 m at room temperature or -30 ° C., and measuring the number of ruptured pipes per ten pipe specimens.

sample Polyethylene Impact modifier Plasticization
time
(minute) Fall impact strength
(Number of Ruptures / 10 Pieces) MI ₅
(g / 10 min) MI _{21 .6}
/ MI ₅ Kinds/
Chlorine content
(weight%) content
(Parts by weight) Room temperature -30 ℃ Example 1 0.3 19 CPE / 25 6 3.9 0 4 Example 2 0.3 19 CPE / 25 7 3.9 0 3 Example 3 0.3 19 CPE / 30 6 4.4 0 6 Example 4 0.3 19 CPE / 30 7 4.0 0 5 Comparative Example 1 0.3 19 CPE / 35 6 5.0 One 10 Comparative Example 2 0.3 19 CPE / 35 7 4.7 One 10 Comparative Example 3 0.7 12 CPE / 35 6 5.7 3 10 Comparative Example 4 0.7 12 CPE / 35 7 5.2 3 10 Comparative Example 5 - - MBS /- 6 4.4 0 9 Comparative Example 6 - - MBS /- 7 4.1 0 5

As can be seen from Table 2, the molded article specimens prepared from the resin compositions of Examples 1 to 4, as compared with Comparative Examples 1 to 4, the plasticizing time was shorter, as well as room temperature and low temperature (-30 The impact strength at the same time was excellent.

In addition, in Examples 1 to 4, even though CPE was used alone as the impact modifier, compared to Comparative Examples 5 to 6 using MBS as the impact modifier, the plasticization time was equal or shorter, and the impact strength was also equal or greater. appear.

Claims (8)

A chlorinated polyethylene resin in which chlorine is bonded to at least part of repeating units of the polyethylene resin,
The polyethylene resin has a melt flow index (load 5kg, 190 ℃: MI ₅ ) of 0.1 to 0.5 g / 10min, melt flow ratio (MFR: MI _21.6 / MI ₅ , 190 ℃) is 19 to 25,
The chlorine is bound in an amount of 20 to 30% by weight relative to the chlorinated polyethylene resin,
Chlorinated polyethylene resin having a heat of fusion of 0.9 to 2 J / g for the crystal region of the resin. The method of claim 1,
The polyethylene resin is at least one chlorinated polyethylene resin selected from the group consisting of low density polyethylene, linear low density polyethylene, linear medium density polyethylene, high density polyethylene and modified polyethylene. delete A composition comprising a polyethylene resin having a melt flow index (load 5 kg, 190 ° C .: MI ₅ ) of 0.1 to 0.5 g / 10 min and a melt flow rate (MFR: MI _21.6 / MI ₅ , 190 ° C.) of 19 to 25 is prepared. Making; And
Injecting chlorine into the composition comprising the step of chlorine substitution reaction,
The chlorine substitution reaction step is carried out so that the substitution amount of chlorine is 10 to 15% by weight based on the total weight of the chlorinated polyethylene resin at 90 to 120 ℃; A process for producing a chlorinated polyethylene resin according to claim 1 which is carried out at 110 to 130 ° C. so that the total substitution of chlorine is 20 to 30% by weight. delete A resin composition comprising a chlorinated polyethylene resin and a polyvinyl chloride resin according to claim 1. The method according to claim 6,
Resin composition containing 1-20 weight part of said chlorinated polyethylene resins with respect to 100 weight part of said polyvinyl chloride resins. The molded article obtained by hardening | curing the resin composition of Claim 6.