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특허 상세정보

Method for preparing microcapsules

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B01J-013/02   
미국특허분류(USC) 252/316 ; 8/552 ; 71/64F ; 252/17413
출원번호 US-0926369 (1978-07-20)
우선권정보 JP-0090148 (1977-07-27)
발명자 / 주소
출원인 / 주소
인용정보 피인용 횟수 : 58  인용 특허 : 1
초록

A method for preparing microcapsules comprising polymerizing urea and formaldehyde in the presence of an anionic polyelectrolyte and an ammonium salt of an acid and forming a wall membrane of a urea/formaldehyde resin around droplets of a hydrophobic oily liquid.

대표
청구항

In a method for preparing microcapsules comprising polymerizing urea and formaldehyde in water in the presence of 0.75 to 10% by weight of an anionic polyelectrolyte and forming a wall membrane of a urea/formaldehyde resin around droplets of a hydrophobic oily liquid, the improvement which comprises the presence of about 1% by weight or more, based on the weight of the urea, of an ammonium salt of an acid, whereby microcapsules having high heat resistance, high strength, low permeability and which are also free from microcapsule slurry coloration are obt...

이 특허를 인용한 특허 피인용횟수: 58

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