[특허]Sinterable mass of polymer powder having resistance to caking and method of preparing the mass

Sinterable mass of polymer powder having resistance to caking and method of preparing the mass 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B28B-011/06 B29C-059/00 B32B-005/16
출원번호	US-0091631 (1993-07-14)
발명자 / 주소	Lee Biing-Lin (Broadview Heights OH)
출원인 / 주소	The B. F. Goodrich Company (Akron OH 02)
인용정보	피인용 횟수 : 41 인용 특허 : 0

초록 ▼

Particles of a fine powder of a thermoplastic synthetic resin (host powder) having a suitable broad range between its initial glass transition temperature (initial Tg) and its final Tg, are partially coated with an anti-caking coating powder (coating powder) by blending at an elevated temperature to form “mottled”particles. The elevated temperature is defined in relation to the initial and final Tgs as: (initial Tg -20)°C. but below the final Tg. Mottled particles, without being encapsulated, have the unique ability to maintain their individual particulate characteristics at a temperature at least 10°C. above the initial Tg of the uncoated host powder, and flow freely under applied pressure. Such pressure is applied by a rolling drum which spreads the mottled particles onto a target bed where they are selectively sintered With a controlled high energy beam, usually a laser beam. Sequentially sintering contiguous layers of the mottled particles results in a porous sintered body. Such a body may be used to make a prototype of an article, which may be difficult or too expensive to machine, then to form a shell mold for use in investment casting. Mottled particles, when stored above their initial Tg, form a bed from 10% to 65% more dense than a bed of uncoated host particles, even when the coating powder coats less than 50% of the area of the particles of host powder.

대표청구항 ▼

A laser sinterable mass of partially coated particles comprising, a host powder having host particles no greater than 177 m0.3-0.6 gm/cm3 and an initial glass transition temperature, initial Tg, higher than 50°C., said initial Tg occurring at least 3°C. lower than said host powder\s final Tg; and, a coating powder having coating particles which coat said host particles leaving at least some portion thereof uncoated; said coating powder is selected from the group consisting of a substantially amorphous coating powder and a crystalline coating powder each having an average particle diameter in the range from 0.02mm0.15 to 0.35 gm/cm3; said amorphous coating powder having an initial Tg and sintering temperature higher than said final Tg of said host particles, and said crystalline coating powder having a crystalline melting point and sintering temperature higher than said final Tg of said host particles; said partially coated particles being essentially free from electric charge, having an increased bulk density at least 10% higher than that of said host powder, and being flowable under applied force in the range from about 10 g-force to about 100 g-force, without caking at a storage temperature above the initial Tg of said host powder but below said host powder\s final Tg; said increased bulk density being obtained by blending said host powder with said coating powder with an energy input greater than 30 watt-hr/lb of said host powder, so as to discharge coated powder at a drop temperature above a minimum drop temperature defined as initial Tg minus 20°C., but at a drop temperature below said host powder\s final Tg.

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Sinterable mass of polymer powder having resistance to caking and method of preparing the mass 원문보기

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