MULTILAYER FILMS HAVING TUNABLE STRAIN HARDENING
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IPC분류정보
국가/구분
United States(US) Patent
공개
국제특허분류(IPC7판)
B32B-027/08
B32B-027/32
출원번호
16480161
(2018-01-19)
공개번호
20190366695
(2019-12-05)
국제출원번호
PCT/US2018/014383
(2018-01-19)
발명자
/ 주소
Lee, Edward L.
Ma, Eng Kian
Patel, Rajen M.
Yap, Peter
Goh, Hwee Lun
Setyogroho, Adit Pradhana Jayusman
출원인 / 주소
Dow Global Technologies LLC
인용정보
피인용 횟수 :
0인용 특허 :
0
초록▼
A multilayer cast film includes a cling layer, a release layer, and at least one core layer disposed between and contacting the cling layer and the release layer. The cling layer includes an ultra low density polyethylene (ULDPE), a propylene interpolymer, or blends thereof. The release layer includ
A multilayer cast film includes a cling layer, a release layer, and at least one core layer disposed between and contacting the cling layer and the release layer. The cling layer includes an ultra low density polyethylene (ULDPE), a propylene interpolymer, or blends thereof. The release layer includes a first linear low density polyethylene (first LLDPE) having a density of from 0.915 to 0.938 g/cc and a melt index of from 0.5 g/10 min to 10 g/10 min. Each of the core layers includes a second linear low density polyethylene (second LLDPE) having a density of from 0.905 to 0.930 g/cc and a melt index of from 0.5 g/10 min to 10 g/10 min. The multilayer cast film includes from 3 wt % to 7 wt %, based on a total amount of polymers present in the multilayer cast film, of the low density polyethylene (LDPE).
대표청구항▼
1. A multilayer cast film comprising: a cling layer comprising: an ultra low density polyethylene (ULDPE) having a density of 0.895 g/cc to 0.910 g/cc and a melt index (I2) of from 2 g/10 min to 10 g/10 min when measured according to ASTM D1238 at 190° C. and 2.16 kg load;a propylene interpolymer co
1. A multilayer cast film comprising: a cling layer comprising: an ultra low density polyethylene (ULDPE) having a density of 0.895 g/cc to 0.910 g/cc and a melt index (I2) of from 2 g/10 min to 10 g/10 min when measured according to ASTM D1238 at 190° C. and 2.16 kg load;a propylene interpolymer comprising at least 60 wt. % units derived from propylene and between 1 and 40 wt % units derived from ethylene, wherein the propylene interpolymer has a density of from 0.840 g/cm3 to 0.900 g/cm3, a highest differential scanning calorimetry (DSC) melting peak temperature of from 50.0° C. to 120.0° C., a melt flow rate, MFR2, of from 1 g/10 min to 100 g/10 min when measured according to ASTM D1238 at 230° C. and 2.16 kg load, and a molecular weight distribution (MWD) of less than 4.0; or blends thereof; a release layer comprising a first linear low density polyethylene (first LLDPE) having a density of from 0.915 to 0.938 g/cc and a melt index (I2) of from 0.5 g/10 min to 10 g/10 min; andat least one core layer disposed between the cling layer and the release layer, wherein each of the at least one core layers comprises a second linear low density polyethylene (second LLDPE) having a density of from 0.905 to 0.930 g/cc and a melt index (I2) of from 0.5 g/10 min to 10 g/10 min; wherein: one or more of the cling layer, the release layer, or the at least one core layer further comprise a low density polyethylene having a density of 0.918 g/cc to 0.931 g/cc and a melt index (I2) of from 0.15 g/10 min to 6 g/10 min;the multilayer cast film comprises from 3 wt % to 7 wt %, based on a total amount of polymers present in the multilayer cast film, of the low density polyethylene (LDPE);the multilayer cast film is defined by at least one of the following properties:a tensile ultimate elongation in the machine direction of less than 300%, as measured in accordance with ASTM D882;a natural draw ratio (NDR) of less than 250%; ora Highlight ultimate stretch of less than 300%, as measured in accordance with ASTM D4649; andthe multilayer cast film exhibits a machine direction tensile stress at second yield of at least 21.0 MPa for a film having a thickness of 10 microns or more in accordance with ASTM D882. 2. The multilayer cast film according to claim 1, wherein the LDPE is present in any one layer in amount of no more than 20 wt %, based on total amount of polymers present in the layer. 3. The multilayer cast film according to claim 1, wherein the release layer comprises from 3 to 20 wt %, based on the total amount of polymers present in the release layer, of the LDPE. 4. The multilayer cast film according to claim 1, wherein when two or more core layers are present, at least one of the core layers comprise from 3 to 20 wt %, based on the total amount of polymers present in that core layer, of the LDPE. 5. The multilayer cast film according to claim 1, wherein the cling layer further comprises a third linear low density polyethylene (third LLDPE) having a density of from 0.905 to 0.930 g/cc and a melt index (I2) of from 0.5 g/10 min to 10 g/10 min. 6. The multilayer cast film according to claim 5, wherein two or more of the first LLDPE, second LLDPE, and third LLDPE are different from each other. 7. The multilayer case film according to claim 5, wherein the first LLDPE, the second LLDPE, and the third LLDPE has a MWD of from 3.5 to 5.0 and a comonomer distribution breadth index (CDBI) of less than 70%. 8. The multilayer cast film according to claim 5, wherein the first LLDPE of the release layer is an ethylene-butene copolymer, and the second LLDPE in the at least one core layer adjacent to the release layer is an ethylene/C5-C20 alpha-olefin interpolymer. 9. The multilayer cast film according to claim 5, wherein the third LLDPE of the cling layer is an ethylene-butene copolymer, and the second LLDPE in the at least one core layer adjacent to the cling layer is an ethylene/C5-C20 alpha-olefin interpolymer. 10. The multilayer cast film according to claim 5, wherein the film comprises three core layers, wherein an inner core layer comprises ethylene-butene copolymer and outer core layers comprise an ethylene/C5-C20 alpha-olefin interpolymer. 11. The multilayer cast film of claim 10, wherein the ethylene-butene copolymer has a melt index (I2) ranging from 0.5 g/10 min to 10 g/10 min. 12. The multilayer cast film of claim 10, wherein the ethylene/C5-C20 alpha-olefin interpolymer has a density of from 0.905 g/cc to 0.930 g/cc. 13. The multilayer cast film of claim 10, wherein the ethylene/C5-C20 alpha-olefin interpolymer has a melt index (I2) ranging from 0.25 g/10 min to 10 g/10 min. 14. The multilayer cast film of claim 1, wherein the core layer has a thickness of from 50% to 90% of the total thickness of the multilayer film. 15. The multilayer cast film of claim 1, wherein the multilayer film has a thickness from 5 μm to 15 μm.
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