[미국특허]
High melt strength polypropylene of improved quality
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08K-005/00
C08L-023/12
C08F-110/06
C08J-005/18
C08F-297/08
C08F-010/06
C08L-023/10
출원번호
US-0406661
(2013-06-26)
등록번호
US-9410034
(2016-08-09)
우선권정보
EP-12174070 (2012-06-28)
국제출원번호
PCT/EP2013/063400
(2013-06-26)
국제공개번호
WO2014/001394
(2014-01-03)
발명자
/ 주소
Klimke, Katja
Braun, Hermann
출원인 / 주소
Borealis AG
대리인 / 주소
Warn Partners, P.C.
인용정보
피인용 횟수 :
0인용 특허 :
1
초록
Use of an additive mixture containing a linear polypropylene and at least one additive in a polypropylene composition comprising said additive mixture and a branched polypropylene to reduce the gel index of said polypropylene composition.
대표청구항▼
1. A process for providing a polypropylene composition having a high melt strength, the process comprising the steps of: (a) providing a branched polypropylene (b-PP) having a F30 melt strength of more than 5.5 cN and a v30 melt extensibility of more than 200 mm/s, wherein the F30 melt strength and
1. A process for providing a polypropylene composition having a high melt strength, the process comprising the steps of: (a) providing a branched polypropylene (b-PP) having a F30 melt strength of more than 5.5 cN and a v30 melt extensibility of more than 200 mm/s, wherein the F30 melt strength and the v30 melt extensibility are measured according to ISO 16790:2005, wherein the branched polypropylene (b-PP) is provided by reacting a polypropylene (PP) with a thermally decomposing free radical-forming agent and optionally a bifunctionally unsaturated monomer;(b) adding to 95 to 99 parts by weight of the branched polypropylene (b-PP) 1 to 5 parts by weight of a linear polypropylene (l-PP) having a melt flow rate MFR2 (230° C.) of 1 to 18 g/10 min. 2. The process according to claim 1, wherein the branched polypropylene (b-PP) is provided by reacting the polypropylene (PP) with a peroxide. 3. The process according to claim 1, wherein step (b) is initiated when at least 80% of the reaction between the polypropylene (PP) and the thermally decomposing free radical-forming agent and optionally the bifunctionally unsaturated monomer has taken place. 4. The process according to claim 1, wherein the step (a) and (b) are accomplished in an extruder, said extruder comprises in operation direction a first mixing zone (MZ1) and a second mixing zone (MZ2), wherein the step (a) takes place in the first mixing zone (MZ1) whereas step (b) takes place in the second mixing zone (MZ2). 5. The process according to claim 4, wherein the extruder comprises in operation direction a feed-throat (FT), the first mixing zone (MZ1), the second mixing zone (MZ2) and a die (D), wherein between the first mixing zone (MZ1) and the second mixing zone (MZ2) a side feed-throat (SFT) is located, wherein the polypropylene (PP), the thermally decomposing free radical-forming agent, and optionally the bifunctionally unsaturated monomer are fed via the feed-throat (FT) and the linear polypropylene (l-PP) is fed via the side feed-throat (SFT). 6. The process according to claim 3, wherein (a) the reaction between the polypropylene (PP) and the thermally decomposing free radical-forming agent and optionally the bifunctionally unsaturated monomer takes place in a first mixing zone (MZ1);and/or(b) not more than 10 wt. % of the total amount of the branched polypropylene (b-PP) is produced in a second mixing zone (MZ2). 7. The process according to claim 1, wherein 1 to 3 parts by weight of the linear polypropylene (l-PP) are added to 97 to 99 parts by weight of the branched polypropylene (b-PP). 8. The process according to claim 1, wherein (a) the linear polypropylene (l-PP) comprises at least one additive (A) selected from the group consisting of antioxidants, metal deactivators, UV-stabilizers, antistatic agents, antifogging agents, acid scavengers, blowing agents, cling agents, lubricants, nucleating agents, slip agents, antiblocking agents and mixtures thereof,and/or(b) the branched polypropylene (b-PP) is free of additives (A). 9. The process according to claim 1, wherein the resulting polypropylene composition has (a) a F30 melt strength of more than 5.5 cN and a v30 melt extensibility of more than 200 mm/s, wherein the F30 melt strength and the v30 melt extensibility are measured according to ISO 16790:2005;and/or(b) a gel index of less than 1,500. 10. The process according to claim 1, wherein the resulting polypropylene composition comprises (a) 95 to 99 parts by weight of the branched polypropylene (b-PP); and(b) 1 to 5 parts by weight of the linear polypropylene (l-PP) having a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of 3 to 15 g/10 min,wherein the polypropylene composition has a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of 8 to 13 g/10 min, anda gel index of less than 1,500;and wherein the polypropylene composition and/or the branched polypropylene (b-PP) has/have a F30 melt strength of 5.8 to 13.0 cN, anda v30 melt extensibility of 230 to 290 mm/s,wherein the F30 melt strength and the v30 melt extensibility are measured according to ISO 16790:2005. 11. The process according to claim 1, wherein the polypropylene composition and/or the branched polypropylene (b-PP) has/have a strain hardening factor (SHF) of at least 1.9, measured at a strain rate of 3.0 s−1 and a Hencky strain of 2.5. 12. The process according to claim 1, wherein the linear polypropylene (l-PP) has a melt flow rate MFR2 (230° C.) of 3 to 15 g/10 min. 13. The process according to claim 1, wherein the branched polypropylene (b-PP) is provided by reacting the polypropylene (PP) with a peroxide, and optionally with a bifunctionally unsaturated monomer selected from the group consisting of divinyl compounds, allyl compounds and dienes. 14. A polypropylene composition having a high melt strength, comprising: a) 95 to 99 parts by weight of a branched polypropylene (b-PP) provided by reacting a polypropylene (PP) with a thermally decomposing free radical forming agent; and(b) 1 to 5 parts by weight of a linear polypropylene (l-PP) having a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of 1 to 18 g/10 min;wherein the polypropylene composition has a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of 8 to 13 g/10 min, anda gel index of less than 1,500;and wherein the branched polypropylene (b-PP) has a F30 melt strength of more than 5.5 cN, anda v30 melt extensibility of more than 200 mm/s,wherein the F30 melt strength and the v30 melt extensibility are measured according to ISO 16790:2005. 15. The polypropylene composition according to claim 14, wherein the polypropylene composition comprises at least one additive (A) selected from the group consisting of antioxidants, metal deactivators, UV-stabilizers, antistatic agents, antifogging agents, acid scavengers, blowing agents, cling agents, lubricants, nucleating agents, slip agents, antiblocking agents and mixtures thereof. 16. A film comprising the polypropylene composition according to claim claim 14. 17. A polypropylene composition having a high melt strength, comprising: (a) 95 to 99 parts by weight of a branched polypropylene (b-PP) provided by reacting a polypropylene (PP) with a thermally decomposing free radical forming agent; and(b) 1 to 5 parts by weight of a linear polypropylene (l-PP) having a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of from 3 to 15 g/10 min;wherein the polypropylene composition has a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of 4 to below 8 g/10 min, anda gel index of less than 1,300;and wherein the branched polypropylene (b-PP) has a F30 melt strength of more than 5.5 cN, anda v30 melt extensibility of more than 200 mm/s, wherein the F30 melt strength and the v30 melt extensibility are measured according to ISO 16790:2005. 18. A process for providing a polypropylene composition having a high melt strength, the process comprising the steps of: (a) providing a branched polypropylene (b-PP) having a F30 melt strength of more than 5.5 cN and a v30 melt extensibility of more than 200 mm/s, wherein the F30 melt strength and the v30 melt extensibility are measured according to ISO 16790:2005, wherein the branched polypropylene (b-PP) is provided by reacting a polypropylene (PP) with a thermally decomposing free radical-forming agent;(b) providing a linear polypropylene (l-PP) having a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of 1 to 18 g/10 min,(c) formulating the polypropylene composition by adding an additive mixture (AM) containing the linear polypropylene (l-PP) of step (b) and at least one additive (A) to the branched polypropylene (b-PP) of step (a), wherein the at least one additive (A) is selected from the group consisting of antioxidants, metal deactivators, UV-stabilizers, antistatic agents, antifogging agents, acid scavengers, blowing agents, cling agents, lubricants, nucleating agents, slip agents, antiblocking agents and mixtures thereof, andwherein the polypropylene composition comprises 95 to 99 parts by weight of the branched polypropylene (b-PP) and 1 to 5 parts by weight of the linear polypropylene (l-PP), and wherein the gel index of said polypropylene composition or films made from said polypropylene composition are reduced. 19. The process according to claim 18, wherein the reduction of gel index is accomplished in case the polypropylene composition or the film made from the polypropylene composition has a gel index of less than 1,500. 20. The process according to claim 18, wherein the polypropylene composition comprises 1 to 5 parts by weight of the linear polypropylene (l-PP) having a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of 3 to 15 g/10 min;wherein the polypropylene composition has a melt flow rate MFR2 (230° C.) measured according to ISO 1133 of 4 to below 8 g/10 min, anda gel index of less than 1,300;and wherein the polypropylene composition and/or the branched polypropylene (b-PP) has/have a F30 melt strength of more than 6.0 to 13.0 cN, anda v30 melt extensibility of 230 to 290 mm/s, wherein the F30 melt strength and the v30 melt extensibility are measured according to ISO 16790:2005.
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