Methods for controlling polymer chain scission
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-008/50
C08F-110/02
C08F-110/06
B29C-048/92
B29C-048/04
B29C-048/08
B29C-048/10
B29C-048/25
B29C-048/693
B29C-048/70
B29C-048/255
B29C-048/69
B29K-023/00
B29C-048/37
출원번호
15545401
(2016-01-20)
등록번호
10471641
(2019-11-12)
국제출원번호
PCT/US2016/014087
(2016-01-20)
국제공개번호
WO2016/118599
(2016-07-28)
발명자
/ 주소
Abe, Daudi A.
Locklear, Brandon C.
출원인 / 주소
Univation Technologies, LLC
대리인 / 주소
Brooks, Cameron & Huebsch, PLLC
인용정보
피인용 횟수 :
0인용 특허 :
0
초록▼
Methods for extrusion of polyolefins (110) that utilize melt temperature to control molecular weight and also reduce gels. Disclosed herein is an example method for controlling polymer chain scission in an extrusion system (100), comprising: melting a polyolefin resin (110) in extruder (102) at a fi
Methods for extrusion of polyolefins (110) that utilize melt temperature to control molecular weight and also reduce gels. Disclosed herein is an example method for controlling polymer chain scission in an extrusion system (100), comprising: melting a polyolefin resin (110) in extruder (102) at a first melt temperature to form a first melt (112); passing the first melt (112) through a screen pack (106); forming the first melt 112) into a first polyolefin product (116, 118); melting additional polyolefin resin (110) of the same grade in the extruder (102) at a second melt temperature to form a second melt (112), wherein the second melt temperature differs from the first melt temperature by 5° C. or more to control chain scission in the extruder (102); passing the second melt (112) through the screen pack (106); and forming the second melt (112) into a second polyolefin product (116, 118).
대표청구항▼
1. A method for controlling polymer chain scission in an extrusion system, comprising: melting a polyolefin resin in extruder at a first melt temperature to form a first melt;passing the first melt through a screen pack;forming the first melt into a first polyolefin product;melting additional polyol
1. A method for controlling polymer chain scission in an extrusion system, comprising: melting a polyolefin resin in extruder at a first melt temperature to form a first melt;passing the first melt through a screen pack;forming the first melt into a first polyolefin product;melting additional polyolefin resin of the same grade in the extruder at a second melt temperature to form a second melt, wherein the second melt temperature differs from the first melt temperature by 5° C. or more to control chain scission in the extruder;passing the second melt through the screen pack; andforming the second melt into a second polyolefin product, wherein the screen pack comprises a plurality of screens arranged in series, wherein the screens comprise an inlet screen having a size from 20 mesh to 80 mesh, two or more intermediate screens having a size of 100 mesh or greater, and an outlet screen having a size from 20 mesh to 80 mesh, wherein a throughput channel in the screen pack has a cross sectional area of at least 344 cm2. 2. The method of claim 1, wherein the two or more intermediate screens comprising a screen having a size from 20 mesh 80 mesh sandwiched between screens of 100 mesh or larger. 3. The method of claim 1, wherein the two or more intermediate screens comprise at least one screen having a size from 200 mesh to 250 mesh. 4. The method of claim 1, wherein the second melt temperature is greater than the first melt temperature such that the second polyolefin product has a molecular weight that is less than a molecular weight of the first polyolefin product. 5. The method of claim 1, wherein the second melt temperature is less than the first melt temperature such that the second polyolefin product has a molecular weight that is greater than a molecular weight of the first polyolefin product. 6. The method of claim 1, wherein the second melt temperature differs from the first melt temperature by 20° C. or more. 7. The method of claim 1, wherein the extruder is a single screw extruder or a twin screw extruder. 8. The method of claim 1, further comprising passing at least one of the first melt or the second melt through a pelletizer configured to form the first melt and/or the second melt into pellets. 9. The method of claim 1, further comprising passing at least one of the first melt or the second melt through a die configured to form the first melt and/or the second melt into a polyolefin film. 10. The method of claim 1, wherein the polyolefin resin comprises a polyolefin made from ethylene monomers or branched higher alpha-olefin monomers containing from 3 to 20 carbon atoms. 11. The method of claim 1, wherein the polyolefin resin comprises a polyolefin having a density of from 0.910 g/cm3 to 0.975 g/cm3. 12. The method of claim 1, wherein the polyolefin resin comprises a polyolefin having a melt index ranging from 0.1 g/10 min to about 1000 g/10 min. 13. The method of claim 1, wherein at least one of the first polyolefin product or second polyolefin product comprises pellets, pipe, sheet, or a film. 14. A method for controlling polymer chain scission in an extrusion system, comprising: providing a polyolefin resin having a molecular weight;selecting a melt temperature for an extruder to cause scission of the polyolefin with decrease in molecular weight;melting the polyolefin resin in the extruder at the melt temperature to form a melt;forming the melt into a polyolefin product; andpassing the melt through a screen pack comprises a plurality of screens arranged in series, wherein the screen comprise an inlet screen having a size from 20 mesh to 80 mesh, two or more intermediate screens having a size of 100 mesh or greater, and an outlet screen having a size from 20 mesh to 80 mesh, wherein a throughput channel in the screen pack has a cross sectional area of at least 344 cm2. 15. The method of claim 14, wherein the extruder is a single screw extruder or a twin screw extruder. 16. The method of claim 14, wherein the polyolefin resin comprises a polyolefin made from ethylene monomers or branched higher alpha-olefin monomers containing from 3 to 20 carbon atoms. 17. The method of claim 14, wherein the polyolefin resin comprises a polyolefin having a density of from 0.910 g/cm3 to 0.975 g/cm3. 18. The method of claim 14, wherein the polyolefin product comprises pellets, pipe, sheet, or a film.
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