Starch-based compositions having uniformly dispersed fibers used to manufacture high strength articles having a fiber-re
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C04B-014/38
C08L-003/02
출원번호
US-0353783
(1994-12-09)
발명자
/ 주소
Andersen Per Just (Santa Barbara CA) Hodson Simon K. (Santa Barbara CA)
출원인 / 주소
E. Khashoggi Industries (Santa Barbara CA 02)
인용정보
피인용 횟수 :
109인용 특허 :
187
초록▼
Compositions, methods, and systems for manufacturing articles, particularly containers and packaging materials, having a starch-bound cellular matrix reinforced with substantially uniformly dispersed fibers. High strength articles that have adequate flexibility and toughness immediately or very shor
Compositions, methods, and systems for manufacturing articles, particularly containers and packaging materials, having a starch-bound cellular matrix reinforced with substantially uniformly dispersed fibers. High strength articles that have adequate flexibility and toughness immediately or very shortly after being demolded without the need for subsequent conditioning are molded from compositions having a starch-based binder and fibers that are uniformly dispersed by means of a high yield stress fluid fraction within the starch-based composition. In a two-step mixing process, a preblended mixture is formed by gelating a portion of the starch-based binder or other thickening agent in water to form a liquid phase having high yield stress into which the fibers are substantially uniformly dispersed. The fibers preferably have an average length of at least about 2 mm and an aspect ratio of at least about 25:1. The remaining starch-based binder, water, and other desired admixtures, such as mold-release agents, inorganic fillers, rheology-modifying agents, plasticizers, integral coating or sealing materials, and dispersants, are added to the preblended mixture to form a moldable starch-based composition, which is molded between heated molds to produce form-stable articles having a desired shape and a selectively controlled foamed structural matrix. Such articles can replace articles presently made from conventional materials like paper, paperboard, polystyrene, plastic, or other organic-based materials and have especial utility in the mass-production of containers, particularly food and beverage containers.
대표청구항▼
A fiber-filled, starch-based composition for molding into a shaped article of manufacture having a cellular matrix, the composition comprising a starch-based binder, water, a thickening agent, and fibers having an average aspect ratio greater than about 25:1, wherein the starch-based binder comprise
A fiber-filled, starch-based composition for molding into a shaped article of manufacture having a cellular matrix, the composition comprising a starch-based binder, water, a thickening agent, and fibers having an average aspect ratio greater than about 25:1, wherein the starch-based binder comprises unmodified starch and remains substantially ungelatinized prior to molding, wherein the water and thickening agent comprise a fluid fraction having a yield stress in a range from about 10 Pa to about 5000 Pa such that the fibers are substantially uniformly dispersed throughout the starch-based composition, wherein the starch-based composition forms the cellular matrix during molding upon substantial gelation of the starch-based binder and subsequent removal of at least a portion of the water from the starch-based composition by evaporation.
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