阅读说明：本技术 具有改进的escr耐性的聚烯烃组合物 (Polyolefin compositions with improved ESCR resistance ) 是由 R·F·坦德勒 A·塞维利恩斯 J·P·J·G·斯基恩斯 P·拉斯金 D·拉弗拉 H·J· 于 2019-01-21 设计创作，主要内容包括：一种包含高密度聚乙烯、聚烯烃弹性体和聚丙烯的聚烯烃组合物,其中所述聚丙烯选自均聚物PP或耐冲击PP,和其中高密度聚乙烯的量多于高密度聚乙烯、聚烯烃弹性体和耐冲击或均聚物聚丙烯的总量的40重量％,和其中高密度聚乙烯、聚烯烃弹性体和聚丙烯的总量为100重量％,和其中所述高密度聚乙烯具有940至960kg/m<Sup>3</Sup>的密度。(A polyolefin composition comprising a high density polyethylene, a polyolefin elastomer and a polypropylene, wherein the polypropylene is selected from homopolymer PP or impact resistant PP, and wherein the amount of high density polyethylene is more than 40 wt% of the total amount of high density polyethylene, polyolefin elastomer and impact resistant or homopolymer polypropylene, and wherein the total amount of high density polyethylene, polyolefin elastomer and polypropylene is 100 wt%, and wherein the high density polyethylene has a density of 940 to 960kg/m 3 The density of (c).)

1. A polyolefin composition comprising high density polyethylene, a polyolefin elastomer and polypropylene,

wherein the polypropylene is selected from homopolymer PP or impact PP, and

wherein the amount of high density polyethylene is more than 40% by weight of the total amount of high density polyethylene, polyolefin elastomer and impact or homopolymer polypropylene, and

wherein the total amount of the high-density polyethylene, the polyolefin elastomer and the polypropylene is 100% by weight, and

wherein the high density polyethylene has 940 to 960kg/m³The density of (c).

2. Polyolefin composition according to claim 1, characterized in that the polyolefin composition comprises >0.1 wt. -% and ≦ 40 wt. -%, preferably >5 wt. -% and <35 wt. -%, more preferably >10 wt. -% and <35 wt. -%, more preferably ≥ 15 wt. -% and ≦ 30 wt. -% of the impact-resistant or homopolymer polypropylene, wherein the total amount of high density polyethylene, polyolefin elastomer and impact-resistant or homopolymer polypropylene is 100 wt. -%.

3. Polyolefin composition according to claims 1-2, characterized in that the polyolefin composition comprises >0.1 wt. -% and ≤ 40 wt. -%, preferably ≥ 2 wt. -% and ≤ 25 wt. -%, more preferably ≥ 5 wt. -% and ≤ 21 wt. -%, more preferably ≥ 9 wt. -% and ≤ 21 wt. -%, wherein the total amount of high density polyethylene, polyolefin elastomer and impact-resistant or homopolymer polypropylene is 100 wt. -%.

4. Polyolefin composition according to claims 1-3, characterized in that the polyolefin composition comprises >41 wt. -% and <90 wt. -%, preferably > 45 wt. -% and < 80 wt. -%, more preferably >50 wt. -% and < 75 wt. -% of the high density polyethylene, wherein the total amount of high density polyethylene, polyolefin elastomer and impact or homopolymer polypropylene is 100 wt. -%.

5. Polyolefin composition according to any of claims 1 to 4, characterized in that the polyolefin elastomer is an ethylene-alpha olefin copolymer, preferably an ethylene-octene copolymer.

6. Polyolefin composition according to any of the preceding claims, characterized in that the amount of high density polyethylene is higher than the amount of polypropylene, and wherein this is based on the weight% of high density polyethylene and the weight% of polypropylene in the composition; and/or the amount of polypropylene is higher than the amount of polyolefin elastomer, and wherein this is based on the weight% of polypropylene and the weight% of polyolefin elastomer in the composition.

7. Polyolefin composition according to any of claims 1 to 6, characterized in that the high density polyethylene has an MFI of ≥ 0.1 and ≤ 30g/10min, preferably ≥ 0.6 and ≤ 15g/10min, more preferably ≥ 0.6 and ≤ 4g/10min (measured at 190 ℃ and 2.16kg according to ISO 1133); and/or the density of the high-density polyethylene is more than or equal to 940 and less than or equal to 958kg/m³More preferably 945 to 955kg/m³(measured according to ISO 1183).

8. Polyolefin composition according to any of claims 1 to 7, characterized in that the MFI of the PP>0.3 and<100g/10min, preferably>0.3 and<10g/10min, more preferably>0.3 and<4g/10min (measured according to ISO1133 at 230 degrees Celsius and 2.16 kg); and/or the density of PP is more than or equal to 900 and less than or equal to 920kg/m³Preference is given to>904 and<906kg/m³(measured according to ISO 1183).

9. Polyolefin composition according to any of claims 1 to 8, characterized in that the polyolefin elastomer has an MFI of ≥ 0.5 and ≤ 30g/10min, preferably ≥ 0.6 and ≤ 10g/10min, more preferably ≥ 0.6 and ≤ 4g/10min (measured at 190 ℃ and 2.16kg according to ASTM D1238); and/or the density of the polyolefin elastomer is more than or equal to 857 and less than or equal to 880kg/m³Preferably not less than 865 and not more than 870kg/m³(measured according to ASTM D1505).

10. Polyolefin composition according to any of claims 1 to 10, characterized by an impact resistance measured by Izod according to ISO180 at 23 ℃ using test bar 4A>50kJ/m²Preference is given to>60kJ/m²More preferably>69kJ/m²。

11. Polyolefin composition according to any of claims 1-10, characterized in that the ESCR performance measured according to ASTM D1693 bending tape ESCR test (Bell test) (10% Igepal CO-630, 50 ℃) at 50% damage in the machine direction is >500 hours, preferably >600 hours, more preferably >650 hours.

12. Use of a polyolefin composition according to any of the preceding claims for the production of injection moulded articles and blow moulded articles.

13. Use of the polyolefin composition according to any of the preceding claims for the production of a pipe system part, a solar hot water tank, a hazardous material container, an industrial container, a fuel tank, a cap or a closure.

14. Blow molded or injection molded article comprising the polyolefin composition according to claims 1-11.

15. Piping system component, solar hot water tank, hazardous material container, industrial container, fuel tank, cap or closure comprising a polyolefin composition according to claims 1-11.

Examples

Material

The materials mentioned in table 1 were used.

Table 1: materials used

Sample preparation

All components were added together as a dry blend and used directly for injection molding. The dry blend was injection molded on an Arburg Allrounder machine using standard molds. Injection molding techniques are well known in the art.

Measuring method

Bell test

ESCR was measured according to ASTM D1693 bending strip ESCR test (Bell test) (10% Igepal CO-630, 50 ℃).

-Izod

Impact resistance was measured by Izod using test bar 4A at 23 ℃ according to ISO 180.

Results

An overview of the samples prepared and their ESCR and impact properties is given in tables 2 and 3. The inventive examples of table 2 comprise impact PP and the inventive examples of table 3 comprise PP homopolymer. The injection molded samples were measured in the machine direction.

Table 2: comparative and inventive examples and an overview of the results of the measurements. Inventive examples include HDPE, impact PP and POE.

Inventive examples inv.1 and inv.2 show a great improvement in impact resistance as measured by Izod and ESCR as measured by Bell test compared to pure HDPE (example C1).

Blends of HDPE and POE show higher impact and ESCR properties compared to pure HDPE, here demonstrated by C2 versus C1. However, the ESCR of the HDPE and POE blends was less good than the inventive examples, shown here at C2 versus inv.1.

This is also the case for blends of HDPE and impact PP, as shown for example in C3. The inventive samples had comparable impact resistance but much better ESCR.

Blends of HDPE, POE and random PP also do not result in such high ESCR performance. This is shown, for example, by C4 versus inv.2.

Inventive examples inv.1 and inv.2 achieve optimum impact resistance and ESCR performance.

Table 3: comparative and inventive examples and an overview of the measurement results. Inventive examples include HDPE, PP homopolymer and POE.

Inventive examples inv.3, inv.4 and inv.5 show a great improvement in impact resistance as measured by Izod and ESCR as measured by the Bell test, compared to pure HDPE (example C1).

Blends of HDPE and POE show higher impact and ESCR properties compared to pure HDPE, here demonstrated by C2 versus C1. However, the ESCR of the HDPE and POE blends was less good than the inventive examples, shown here at C2 versus inv.3 and inv.4.

Blends of HDPE and PP homopolymer show the same impact resistance and only slightly improved ESCR performance compared to pure HDPE, here demonstrated by C5 versus C1. However, the ESCR of the HDPE and PP homopolymer blends was not as good as the inventive examples compared to the inventive examples, shown here as C5 versus inv.3.

Inventive examples inv.3, inv.4 and inv.5 achieve optimum impact resistance and ESCR performance.