Process for removing water from polyurethane ingredients
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08L-023/26
C08L-023/36
C08J-003/21
C08K-005/16
출원번호
US-0805084
(1991-12-11)
발명자
/ 주소
Weichmann Josef B. (Brandhub DEX)
출원인 / 주소
ChemRex Inc. (Waukesha WI 02)
인용정보
피인용 횟수 :
6인용 특허 :
0
초록▼
Ingredients or precursor for synthesizing or formulating urethane polymers and prepolymers are dried by admixing therewith an enamine which reacts with the water. While some ingredients, such as polyols and solvents, can be individually dried in this manner, the enamine preferably is added after the
Ingredients or precursor for synthesizing or formulating urethane polymers and prepolymers are dried by admixing therewith an enamine which reacts with the water. While some ingredients, such as polyols and solvents, can be individually dried in this manner, the enamine preferably is added after the polyol(s), solvent(s) and additives have been blended. When prepolymers having a relatively low free isocyanate content are to be synthesized or admixed with other ingredients, a sufficient amount of an isocyanate, preferably the same one used for synthesis, is added to react with amines liberated by the enamine-water reaction to produce an inert urea derivative.
대표청구항▼
A process for removing water from ingredients or precursors used in synthesizing or formulating urethane polymers, prepolymers or formulations, including polyols, solvents, plasticizers and other additives which are admixed with an isocyanate or an isocyanate-prepolymer, said process comprising admi
A process for removing water from ingredients or precursors used in synthesizing or formulating urethane polymers, prepolymers or formulations, including polyols, solvents, plasticizers and other additives which are admixed with an isocyanate or an isocyanate-prepolymer, said process comprising admixing with individual ingredients or blend of two or more ingredients a sufficient amount of water-reactive enamine drying agent to react with water therein and liberate an amine and thereby reduce the total free moisture content in the resulting blend of ingredients or precursors making up the urethane polymer, prepolymer or formulation to a level below where appreciable foaming, bubble formation and/or crosslinking during or after processing can be caused by an isocyanate-water reaction, said enamine having the formula [Figure] wherein R1 is selected from the group consisting of H, a substituted or unsubstituted alkyl, alkenyl or alkynyl radical containing 1 to 12 C atoms and an aryl radical containing 6 to 10 C atoms and is linked with the C〓C in the backbone of said enamine either directly or via a -CO-or -0-CO-group; R2 is selected from the group consisting of H, a substituted or unsubstituted alkyl, alkenyl or alkynyl radical containing 1 to 12 C atoms and an aryl radical containing 6 to 10 C atoms, is linked with the C〓C in the backbone of said enamine either directly or via a -CO-or -0-CO-group and is either not linked with R3 or linked with R3 and with the C〓C in the backbone of said enamine to form a 5-, 6-, 7- or 8- membered ring including said C〓C; R3 is selected from the group consisting of H, a substituted or unsubstituted alkyl, alkenyl or alkynyl radical containing 1 to 12 C atoms and an aryl radical containing 6 to 10 C atoms and is either not linked with R2 or linked with R2 and with C〓C in the backbone of said enamine to form a 5-, 6-, 7- or 8- membered ring including said C〓C; and R4 and R5 each is selected from the group consisting of H, a substituted or unsubstituted alkyl, alkenyl or alkynyl radical containing 1 to 12 carbon atoms and an aryl radical containing 6 to 10 C atoms and either separately linked to the N in the backbone of said enamine or linked together with said N to form a 5- or 6- membered ring including said N, with or without another N or O in said ring as a heteroatom.
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