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JP-7856628-B2 - Polymers of ethylene and monocyclic organosiloxanes

JP7856628B2JP 7856628 B2JP7856628 B2JP 7856628B2JP-7856628-B2

Inventors

  • コーゲン、ジェフリー エム．
  • スン、ヤビン
  • パーソン、ティモシー ジェイ．
  • クラソフスキー、アルカジー エル．
  • イ、ピョン
  • ブラウン、ヘイリー エイ．
  • エワート、ショーン ダブリュ．

Assignees

  • ダウ グローバル テクノロジーズ エルエルシー

Dates

Publication Date
20260511
Application Date
20200729

Claims (8)

  1. An ethylene-based polymer composition, It includes a polymer backbone formed by polymerizing units derived from ethylene, units derived from comonomers, and optionally units derived from termonomers, The comonomer is a monocyclic organosiloxane (MOCOS) of formula (I) present in the ethylene polymer in an amount of 0.01% to 2.0% by weight , based on the total weight of the ethylene polymer composition . [R 1 , R 2 SiO 2/2 ] n Formula (I) In the formula, n is an integer of 3 , 4, 5, or 6 . Each R1 is independently ( C2 to C4 ) alkenyl or H2C =C( R1a )-C(=O)-O-( CH2 ) m- , R 1a is H or methyl, m is an integer from 1 to 4, An ethylene-based polymer composition in which each R2 is independently H, ( C1 - C4 ) alkyl, phenyl, or R1 .
  2. The ethylene-based polymer composition according to claim 1, comprising 0.01% to 0.5% by weight of the MOCOS comonomer.
  3. The ethylene-based polymer composition according to claim 1 or 2, wherein the MOCOS comonomer is selected from the group consisting of 2,4,6-trimethyl-2,4,6-trivinyl-cyclotrisiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl-cyclotetrasiloxane, 2,4,6,8,10-pentamethyl-2,4,6,8,10-pentavinyl-cyclopentasiloxane, and combinations thereof.
  4. The aforementioned ethylene polymer (i) Mw/Mn between 7.5 and 9.5, The ethylene-based polymer composition according to any one of claims 1 to 3, wherein the ethylene/MOCOS copolymer has (ii) a vinyl content of 0.3600/1000 carbons to 0.6200/1000 carbons, and (iii) a trans content of 0.1000/1000 carbon atoms to 0.3100/1000 carbon atoms.
  5. The ethylene/MOCOS copolymer is (iv) It has an MI of 2.0 g/10 min to 5.0 g/10 min, and (v) a melt strength of 5.0 to 8.5 cN. The aforementioned MI was measured according to the conditions of 190°C/2.16 kg. The aforementioned melt strength is measured at 190°C. The ethylene-based polymer composition according to claim 4 .
  6. The ethylene-based polymer composition according to claim 1, wherein the aforementioned ter-monomer is present, and selected from the group consisting of olefins, unsaturated esters, functionalized alkenes, and combinations thereof.
  7. The ethylene-based polymer is present in an amount of 0.01% to 0.5% by weight of the MOCOS comonomer, The ethylene-based polymer composition according to claim 6, comprising 0.5% to 20% by weight of the ter monomer.
  8. An article comprising the ethylene-based polymer composition described in any one of claims 1 to 7.

Description

The level of branching in ethylene-based polymers, such as low-density polyethylene (LDPE), is primarily determined by factors such as the reactor design (autoclave or tubular) and the polymerization conditions used to produce the LDPE. Branching agents are known to improve the level of branching in LDPE. However, the process conditions required to achieve modified LDPE with a high level of branching often result in a final product with inferior properties, containing a higher content of low molecular weight extractable fractions. Therefore, in this technical field, there is a recognized need for LDPE with improved branching levels and improved melt strength, and for LDPE prepared under polymerization conditions that maintain good polymer properties. This disclosure relates to ethylene-based polymer compositions. In one embodiment, the ethylene-based polymer composition comprises units derived from ethylene, units derived from comonomers, and optionally units derived from termonomers. The comonomer is a monocyclic organosiloxane (MOCOS) of formula (I), [R 1 ,R 2 SiO 2/2 ] n In the formula, n is an integer greater than or equal to 3. Each R1 is independently ( C2 to C4 ) alkenyl or H2 C=C( R1a )-C(=O)-O-( CH2 ) m- , R 1a is H or methyl, m is an integer between 1 and 4. Each R2 is independently H, ( C1 - C4 ) alkyl, phenyl, or R1 . Definitions: All references to the Periodic Table refer to the Periodic Table published by CRC Press, Inc., 1990–1991. References to element groups in this table are based on a new notation for numbering groups. For the purposes of U.S. patent practice, the content of any referenced patent, patent application, or publication, particularly with respect to the disclosure of definitions (to the extent that it does not conflict with any definitions specifically provided in this disclosure), is incorporated in whole by reference (or its corresponding U.S. version is incorporated in this way by reference). The numerical ranges disclosed herein include all values from the lower limit to the upper limit, including the lower and upper limits. In the case of ranges containing explicit values (e.g., 1 or 2, or 3 to 5, or 6 or 7), any sub-ranges between any two explicit values are included (e.g., the above range of 1 to 7 includes sub-ranges such as 1 to 2, 2 to 6, 5 to 7, 3 to 7, 5 to 6, etc.). Unless otherwise stated, implied by the context, or customary in the art, all parts and percentages are based on weight, and all test methods are current as of the filing date of this disclosure. As used herein, "acrylate" refers to the following structure (A): In the formula, R1 is a hydroxyl group or a C1 - C18 alkoxy group, and R2 is H or CH3 ) the monomer contains these monomers. Examples of acrylate monomers include acrylates and methacrylates. Alkanes are saturated hydrocarbons. Alkyl (or alkyl) is an alkane with a bond value (typically monovalent). An "alkene" is a hydrocarbon containing a carbon-carbon double bond. An "alkenyl" (or "alkenyl group") is an alkene with a bond value (typically monovalent). The term "allyl" (or " allyl group") refers to a monovalent unsaturated C3H5 hydrocarbon. In other words, an allyl group is propene with one hydrogen atom removed. As used herein, the terms “blend” or “polymer blend” refer to a mixture of two or more polymers. A blend may be miscible or improper (not phase-separated at the molecular level). A blend may be phase-separated or not. A blend may contain or not contain one or more domain configurations determined by transmission electron spectroscopy, light scattering, X-ray scattering, and other methods known in the art. A blend may be formed by physically mixing two or more polymers at a macro level (e.g., melt blending or compounding of resins) or at a micro level (e.g., simultaneous formation in the same reactor). The term "composition" refers to a mixture of materials containing the composition, as well as reaction and decomposition products formed from the materials of the composition. The terms “comprising,” “including,” and “having,” and their derivatives, are not intended to exclude the existence of any additional components, steps, or procedures, whether or not they are specifically disclosed. To avoid doubt, all compositions claimed through the use of the term “comprising” may include any additional additives, adjuvants, or compounds, whether polymers or otherwise, unless otherwise stated. In contrast, the term “essentially consisting of” excludes any other components, steps, or procedures from the scope of any subsequent description, except those not essential to operability. The term “consisting of” excludes any components, steps, or procedures not explicitly described or enumerated. The term “or” refers to the enumerated members individually and in any combination, unless otherwise specified. The use of the singular includes the use of the plural, and vice versa. An "ethylene-based polymer" is a polymer containing more than 50 weight perc