Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-06-01
2000-04-18
Jagannathan, Vasu
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523161, 523423, 528419, 524505, 525409, C08G 6504, C09D17102, C09D 1102, C09U 1116, C08L 7102
Patent
active
060516275
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a compound for dispersing particulate solids in an aqueous medium, its method of preparation and compositions containing said compound and a particulate solid, including paints and inks.
Mill-bases for water-borne paints are conventionally prepared by subjecting an aqueous medium containing a water-insoluble particulate solid such as a pigment to a grinding operation in the presence of both a resin and a dispersing agent in order to uniformly distribute the finely divided solid throughout the medium. However, when such mill-bases are added to a paint, the dispersing agent can adversely effect the film-forming characteristics of the paint and/or its durability as a paint film. Some dispersing agents also adversely affect the gloss of the resulting paint film. Consequently, improved dispersing agents are required which are capable of dispersing greater amounts of particulate solid in the medium, and exhibiting increased stability of the dispersion and superior properties in the resulting paint film, especially higher gloss finish.
According to the present invention there is provided a dispersant which is a phosphate ester of a poly(C.sub.2-3 -alkylene glycol)-mono-C.sub.1-4 -alkyl ether of formula 1 methyl.
Preferably, m is not less than 3 and especially not less than 5. It is also preferred that m is not greater than 45, more preferably not greater than 35 and especially not greater than 20.
Preferably, n is not less than 3, more preferably not less than 5 and especially not less than 7. It is also preferred that n is not greater than 40, more preferably not greater than 30 and especially not greater than 25.
The molecular weight of the mono alkyl ether of formula 1 is preferably less than 12,000, more preferably less than 8,000, even more preferably less than 5,000 and especially less than 3,000. It is also preferred that the molecular weight of the monoalkyl ether of formula 1 is not less than 400, more preferably not less than 800 and especially not less than 1,000.
The ratio of m to n is preferably between 1 to 3 and 3 to 1 and especially between 2 to 5 and 5 to 2.
The phosphate ester is obtainable by reacting the monoalkyl ether of formula 1 with a phosphating agent wherein the ratio of monoalkyl ether to each phosphorus atom of the phosphating agent is from 3:1 to 1:1 and especially from 2:1 to 1:1.
It is especially preferred that the ratio of monoalkyl ether to each phosphorus atom of the phosphating agent is less than 2, for example, about 1.5:1 when the dispersant is a mixture of mono- and di-phosphate esters.
The phosphate ester may be in the form of a free acid or it may form a salt with an alkali metal, ammonia, an amine, alkanolamine or a quaternary ammonium cation.
The phosphate ester may also be further reacted with an alkanol or alkanolamine. Preferred alkanols are C.sub.1-6 - and especially C.sub.1-4 -alkanols. When the phosphate ester is further reacted with the alkanol additional ester groups are formed and the ratio of the monoalkyl ether of formula 1 to the phosphorus atom of the phosphating agent is less than 2 and especially less than 1.5.
When the phosphate ester is reacted with an alkanolamine, the alkanolamine may form ester and/or amido groups and/or amine salts. It is believed that the reaction product is mainly an amine salt.
Preferred phosphating agents are POCl.sub.3, polyphosphoric acid and especially P.sub.2 O.sub.5.
Preferably, the alkali metal is lithium, potassium and especially sodium.
Examples of alkanolamines are ethanolamine, diethanolamine, 2-dimethylamino ethanol and 2-amino-2-methyl-1-propanol.
The monoalkyl ether of formula 1 is made by any method known to the art and is preferably made by reacting a polyethyleneglycol monoalkyl ether of formula 2 with propylene oxide
Typically, the monoalkyl ether of formula 2 is reacted with propylene oxide in an inert atmosphere such as nitrogen and under anhydrous conditions in the presence of an alkali metal. The alkali metal is preferably lithium, sodium and especially potassium. The alkali m
REFERENCES:
patent: 2674619 (1954-04-01), Lunsted
patent: 2677700 (1954-05-01), Jackson et al.
patent: 3029216 (1962-04-01), Bailey, Jr.
patent: 3595968 (1971-07-01), Groves et al.
patent: 4183766 (1980-01-01), Woodward
patent: 4629748 (1986-12-01), Miyajima et al.
patent: 4966621 (1990-10-01), Heinrich et al.
patent: 5324354 (1994-06-01), Jesse et al.
patent: 5412021 (1995-05-01), Nakanishi
Lewis Sr., Richard J.; Hawley's Condensed Chemical Dictionary 12th Ed., John Wiley and Sons, New York (p. 435) 1993.
Chemical Abstracts, vol 117, No 24, Dec. 14, 1992, abstract No 237031, XP002023796, abstract; RN: 144636-11-3, 144636-12-4; 144636-13-5 & JP 04 100 894 A.
Chemical Abstracts, vol 117, No 6, Aug. 10, 1992, abstract No 50999, XP002023797, abstract; RN: 142297-64-1, & JP 04001 281 A.
Chemical Abstracts, vol 109, No 26, Dec. 26, 1988, abstract No 236726; XP002023798, abstract; RN: 71662-44-7 & JP 62 286 914 A.
Chemical Abstracts, vol 107, No 22, Nov. 30, 1987, abstract No 204923, XP002023799, abstract; RN: 68855-19-6, 68855-20-9 & JP 62 148 418 A.
Holbrook Mark
Thetford Dean
Jagannathan Vasu
Shosho Callie E.
Zeneca Limited
LandOfFree
Phosphate esters of polyalkylene ether block copolymers and thei does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Phosphate esters of polyalkylene ether block copolymers and thei, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phosphate esters of polyalkylene ether block copolymers and thei will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2336800