[특허]Foam structures of ethylenic polymer material having enhanced toughness and elasticity and process for making

Foam structures of ethylenic polymer material having enhanced toughness and elasticity and process for making 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08J-009/18
출원번호	US-0054330 (1993-04-28)
발명자 / 주소	Park Chung P. (Pickerington OH) Stevens James C. (Midland MI) Knight George W. (Lake Jackson TX)
출원인 / 주소	The Dow Chemical Company (Midland MI 02)
인용정보	피인용 횟수 : 61 인용 특허 : 0

초록 ▼

Disclosed is an ethylenic polymer foam structure comprising an ethylenic polymer material. The ethylenic polymer material contains a substantially linear ethylenic polymer having: a) a melt flow ratio, I10I2, ≥5.63; b) a molecular weight distribution, Mw/Mn, defined by the equation Mw/Mn≤(I10/I2)-4.63; and c) a critical shear rate at onset of surface melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a linear olefin polymer having about the same I2 and Mw/Mn. The foam structures have toughness and elasticity similar to those formed from conventional LLDPE without the poor dimensional stability and foam quality associated with those structures. The foam structures have foam quality similar to those made with conventional LDPE but with enhanced toughness and elasticity. Further disclosed is a process for making the above foam structure and making it in a foam bead form. Further disclosed is a process for making an article of the foam beads.

대표청구항 ▼

A process for making an ethylene polymer foam structure, comprising: a) heating an ethylene polymer material to form a melt polymer material, the ethylene polymer material comprising a substantially linear ethylene polymer having: i) a melt flow ratio, I10/I2, ≥5.63; ii) a molecular weight distribution, Mw/Mn, defined by the equation: Mw/Mn ≤(I10/I2)-4.63; and iii) a critical shear rate at onset of surface melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a linear olefin polymer having about the same I2 and Mw/Mn; b) incorporating into the melt polymer material at an elevated pressure a blowing agent; and e) expanding the foamable gel at a reduced pressure to form the foam structure.

이 특허를 인용한 특허 (61)

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Bambara John D. ; Bambara Richard ; Smith Scott C. ; Smith Thomas W., Laminated foam structures with enhanced properties.
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Bambara John D. ; Kozma Matthew L. ; Hurley Robert F., Silane-grafted materials for solid and foam applications.
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Bambara John D. ; Kozma Matthew L. ; Hurley Robert F., Silane-grafted materials for solid and foam applications.
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Foam structures of ethylenic polymer material having enhanced toughness and elasticity and process for making 원문보기

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