[특허]Method of preparation of crosslinked hydrophilic resins

Method of preparation of crosslinked hydrophilic resins 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08F-008/00
출원번호	US-0251826 (1994-05-31)
우선권정보	GB-0008449 (1992-04-16)
발명자 / 주소	Gartner Herbert (Baden-Baden DEX) Petri Roswitha (Wissembourg FRX) Trijasson deceased Philippe (late of Strasbourg FRX by Fabienne Jeanne Trijasson Heir at Law and Guardian for Florian Trijasson
출원인 / 주소	The Dow Chemical Company (Midland MI 02)
인용정보	피인용 횟수 : 33 인용 특허 : 0

초록 ▼

The invention is crosslinked carboxyl containing hydrophilic resin crosslinked by a compound corresponding to formula 1, R1－(O(CH(R3)CH(R3)O)y－C(O)－R2)x wherein: R1 is independently is each occurrence a C2-10 straight or branched chain alkyl moiety; R2 is independently is each occurrence a C2-10 straight or branched chain alkenyl moiety; R3 is independently in each occurrence hydrogen or methyl; x is independently in each occurrence 2 or greater where x is 2; y is independently in each occurrence 3 to 8, and where x is 3 or greater, y is independently in each occurrence 2 to 7. In another embodiment, the invention is a process for the preparation of crosslinked hydrophilic resins which comprises A) contacting one or more ethylenically unsaturated carboxylic acids, acid arthydrides, and optionally one or more known comonomers with a crosslinking compound of formula 1 in an aqueous medium, optionally in the presence of a free radical or redox catalyst system, under conditions such that a crosslinked hydrophilic resin is prepared. Optionally, the properties of the crosslinked hydrophilic resin are enhanced by heating the crosslinked hydrophilic resin under conditions such that the crosslinked hydrophilic resin exhibits a centrifuge capacity 25 (g/g) or greater, an absorption under load of 25 g/g or greater, and a ratio of absorption under load to centrifuge capacity of 0.6 or greater.

대표청구항 ▼

A process for the preparation of a crosslinked hydrophilic resin which comprises A) contacting i) one or more of an ethylenically unsaturated carboxylic acid, an ethylenically unsaturated acid anhydride or a salt thereof and optionally ii) one or more of an acrylamide, a vinyl pyrrolidone, a vinyl sulphonic acid, an acrylonitrile, and a polyvinyl alcohol with iii) a crosslinking compound in an aqueous medium, optionally in the presence of a free radical or redox catalyst system, under conditions such that a crosslinked hydrophilic resin is prepared, wherein the crosslinking compound is a compound of the formula R1－(O(CH(R3)CH(R3)O)y－C(O)－R2)x wherein each R1 is independently a polyvalent C2-10 straight or branched chain alkyl moiety; each R2 is independently a C2-10 straight or branched chain alkenyl moiety; each R3 is independently hydrogen or methyl; each x is independently about 2 or more; when x is 2, each y is independently from about 3 to about 8; and when x is 3 or more, each y is independently from about 2 to about 7; B) recovering the crosslinked hydrophilic resin in the form of a hydrogel from the reactor; C) drying the hydrogel of the crosslinked hydrophilic resin at a temperature sufficient to substantially remove the remaining water and water miscible solvent present in the hydrogel of the hydrophilic resin; D) optionally, reducing the particle size of the dried hydrophilic resin by mechanical means; and, E) submitting the crosslinked hydrophilic resin particles to a post-heat treatment by heating the crosslinked hydrophilic resin particles under conditions such that the crosslinked hydrophilic resin exhibits a centrifuge capacity of about 25 g/g or greater, an absorption under load of about 25 g/g or greater and a ratio of absorption under load to centrifuge capacity of about 0.6 or greater.

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