[특허]Process of making a superabsorbent polyurethane foam

Process of making a superabsorbent polyurethane foam 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08L-075/00 C08G-018/10
출원번호	US-0888548 (1986-07-18)
발명자 / 주소	Garvey Chad E. (Ball Ground GA)
출원인 / 주소	Kimberly-Clark Corporation (Neenah WI 02)
인용정보	피인용 횟수 : 48 인용 특허 : 0

초록 ▼

A superabsorbent polyurethane foam based on a quasi-interpenetrating polymer network of a crosslinked polyurethane and a substantially linear addition polymer, the molecules of which addition polymer are comprised of functional group-containing repeating units which may be the same or different. The functional groups of the repeating units are selected from the group consisting of carbamoyl, substituted carbamoyl, and carboxy and the alkali metal and ammonium salts thereof. A method of preparing the foams is described which involves forming the polyurethane foam in the presence of addition polymerizable monomers and a thermally activated free radical initiator. Addition polymerization can take place during or after foam formation. Reactants and reaction conditions are selected so as to essentially avoid grafting of addition polymer to polyurethane. Preferably, the polyurethane is derived from an isocyanate-terminated poly(oxyalkylene) polyol having an isocyanate functionality greater than two and the addition polymer is the polymerization product of at least one compound selected from the group consisting of acrylamide, substituted acrylamides, and acrylate and methacrylate salts, i.e., alkali metal and ammonium salts of acrylic and methacrylic acid. Such superabsorbent polyurethane foam is useful in the manufacture of absorbent articles, especially disposable absorbent articles such as diapers, sanitary napkins, bedpads, incontinent pads, and the like.

대표청구항 ▼

A method of preparing a superabsorbent polyurethane foam which comprises mixing an isocyanate-terminated polyurethane prepolymer having an isocyanate functionality greater than two with (1) at least one compound having (a) at least one carbon-carbon double bond capable of undergoing addition polymerization with itself and other compounds which may be present and (b) at least one functional group selected from the group consisting of carbamoyl, substituted carbamoyl, and carboxy and the alkali metal and ammonium salts thereof; and (2) water, in the presence of at least one thermally activated free radical initiator, with the resulting polyurethane foam being essentially free of grafting of addition polymer to polyurethane.

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Process of making a superabsorbent polyurethane foam 원문보기

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