[특허]Methods for producing hollow microspheres made from dispersed particle compositions

[미국특허] Methods for producing hollow microspheres made from dispersed particle compositions 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B22F-003/10 B29C-035/00 B29C-071/00
출원번호	US-0538077 (1990-06-13)
발명자 / 주소	Torobin Leonard B. (Microcel Technology Inc. 1 Ethel Rd. Ste. 108 Edison NJ 08817)
인용정보	피인용 횟수 : 96 인용 특허 : 0

초록 ▼

Method for making hollow microspheres of substantially uniform diameter and of substantially uniform wall thickness is disclosed. The walls of the hollow microspheres comprise sintered together particles which define interconnecting voids within the walls and a single central cavity in the interior of the microspheres and inner and outer microsphere wall surfaces. The interconnecting voids are continuous and extend from the outer wall surface to the inner wall surface. The walls have substantially uniform void content and the interconnecting voids are substantially uniformly distributed in the walls of the hollow microspheres and the walls of the hollow microspheres are free of latent solid or liquid blowing gas materials and are substantially free of relatively thinned wall portions and bubbles. The method includes heating the microspheres for a sufficient period of time to close and seal the interconnecting void.

대표청구항 ▼

A method for making hollow microspheres of 200 to 10,000 micron diameter and of 1 to 1000 microns wall thickness from a stable dispersion of a dispersed particle film forming composition, said composition comprising dispersed particles in a continuous liquid phase, said method comprising feeding said dispersed particle composition and a blowing gas to a coaxial blowing nozzle, said coaxial blowing nozzle having an inner coaxial nozzle for said blowing gas and an outer coaxial nozzle for said dispersed particle composition and a coaxial blowing nozzle orifice, feeding said blowing gas to said inner nozzle, feeding said dispersed particle composition to said outer nozzle to blow and form, in the region of said coaxial blowing nozzle orifice, hollow dispersed particle composition microspheres having stable film walls, removing said hollow microspheres from the region of said coaxial blowing nozzle orifice, surface tension forces acting on said hollow microspheres to cause said hollow microspheres to form a spherical shape, said dispersed particle composition forming the walls of said hollow microspheres and said dispersed particles being uniformly dispersed in said continuous liquid phase, treating said removed hollow microspheres to remove a portion of the continuous liquid phase to bring the dispersed particles into point to point contact and to harden them, said dispersed particles being of sufficient size and in a sufficient amount such that the dispersed particles in the walls of the hollow microspheres link up and form a relatively rigid latticework of dispersed particles to obtain hollow green microspheres that have substantially uniform distribution of the dispersed particles in the continuous phase of the walls of the microspheres; subjecting said hollow green microspheres to a sufficiently high temperature for a sufficient period of time to remove the continuous liquid phase from the hollow green microspheres and to sinter the dispersed particles at their points of contact and to form within the walls of said hollow microspheres interconnecting voids that are continuous from the outer wall surface to the inner wall surface of the hollow microspheres; and continuing to heat said hollow microspheres for a sufficient period of time to close and seal said interconnecting voids to obtain hollow microspheres in which the interconnecting voids have been closed and sealed.

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[미국특허] Methods for producing hollow microspheres made from dispersed particle compositions 원문보기

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