WO2006027635A1 - N-poly (alkenyl) acrylamides and process for preparation thereof - Google Patents

N-poly (alkenyl) acrylamides and process for preparation thereof Download PDF

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WO2006027635A1
WO2006027635A1 PCT/IB2004/002893 IB2004002893W WO2006027635A1 WO 2006027635 A1 WO2006027635 A1 WO 2006027635A1 IB 2004002893 W IB2004002893 W IB 2004002893W WO 2006027635 A1 WO2006027635 A1 WO 2006027635A1
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poly
formula
alkenyl
reaction
acid
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PCT/IB2004/002893
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French (fr)
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Sivaram Swaminathan
Jogimarappagari Yanjarappa Mallinamadugu
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Council Of Scientific And Industrial Research
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups

Definitions

  • N-alkylacrylamides such as N-isopropyl, N-fert-butylacrylamide and N-n- octylacrylamide, are of important classes of monomers for the synthesis of polymers, which are useful in applications such as sizing agents, rheology modifiers and water soluble polymers.
  • N-isopropylacrylamide has assumed significant importance owing to the commercial importance of its polymer.
  • Poly(N-isopropylacrylamide) has been widely studied for its novel thermal behaviour in aqueous media [Schild HG. Progress in Polymer Science. 17, 163 (1992)] and possesses inverse solubility upon heating, a property contrary to the behaviour of most polymers in organic solvents under atmospheric pressure near ambient temperature.
  • LCST lower critical solution temperature
  • hydrophobic groups In aqueous solution the hydrophobic groups aggregate to minimize their exposure to water and, thereby, form hydrophobic microdomains in a fashion analogous to that of surfactants above their critical micelle concentration. Above a certain concentration (C ag ), intermolecular hydrophobic interactions lead to the formation of a three dimensional network of polymer chains resulting in an increase in the apparent molecular weight and, consequently, a substantial viscosity enhancement.
  • Copolymers of N-alkylacrylamides with various other monomers are also finding diverse applications.
  • poly(N-dodecylacrylamide-co-N-methyl-4-vinyl pyridinium Na) is reported to be a useful as salt resistant viscosity builder [D. Christine, B. Alain andL. Pierre, Macromol. Symp. 102,233 (1995), D. Christine, B. Alain, B. Fransis and V. M.
  • poly (N-stearoyl acrylamide-co-2-(3- acrylamidopropyl) dimethyl aminoethyl isoproply phosphate) is used as phosphatidylcholine analogous material /TK Yenfeng, C. Tianming, K. Masaya andN. Taiao, J.Polym. ScL Chem. Edn. 34, 449 (1996)]
  • poly (N-tert-octylacrylamide-co-N-alkylacrylamide) has been employed as a thickener in cosmetics [J. Mondet and B. Lion Eur. Pat. Appl.
  • N-alkylacrylamides are, thus, a useful class of monomers. In order to meet the growing demand and new applications of N-alkylacrylamides, various methods have been developed for their synthesis.
  • N-alkylacrylamides Some of these methods for the synthesis of N-alkylacrylamides include (1) reaction of acryloyl chloride with alkyl amine; (2) pyrolysis or thermal decomposition of carboxylic acid amides, and (3) reaction of iso-olefms with nitriles.
  • N-alkylacrylamides are prepared by reacting acryloyl chloride with the corresponding alkyl amines in the presence of an acid quencher i.e. triethyl amine at 0° C.
  • an acid quencher i.e. triethyl amine at 0° C.
  • N-alkylacrylamides are prepared by amidation of bicyclic carboxylic acids followed by the thermal decomposition of the carboxamide.
  • the reaction of dimethylamine with bicyclo [2.2.1]hept-2-ene-2-carboxylic acid in an autoclave gave N,N-dimethyl bicyclo [2.2.1]hept-2ene-2-carboxylic acid which was subjected to thermal decomposition at 200° C/vacuum to give N,N-dimethyl bicyclo [2.2.1]hept-2-ene-2-carboxamide [A. Ohshima and K. Tsubashima Jpn. Tokkyo Koho 7909 170, A. Oshima, K.
  • N-alkylacrylamides are prepared by reacting acrylonitrile with various iso-olefins. It is also known to synthesise N-tert-octylacrylamide by reacting acrylonitrile with 2,4,4-trimethyl-l-pentene at 40° C for 3 hours using 65% H 2 SO 4 as solvent [T. Takada, Y. Kawakatsu, T. Mihamisawa and K. Hara, Japan Kokai-739101 I].
  • Method (1) cannot be used for preparation of higher N-alkyl acrylamides (where alkyl chain length > Cl 8) as alkylamines with >18 carbon atoms are not readily available.
  • the method uses acryloyl chloride, which is an expensive and hazardous reagent and requires disposal of large quantities of chloride as waste.
  • Methods of type (2) suffer from the drawbacks of high temperatures, high vacuum and tedious work up procedures. This method is also applicable generally to only alkyl amides with small alkyl chain lengths.
  • the reaction of olefins with nitriles is the most suitable general method for the synthesis of N-alkyl acrylamides and has been widely practiced. However, this method is restricted by the availability of suitable iso-olefins (isobutylene, 2,4,4-trimethyl-l-pentene etc) with carbon numbers less than eight or twelve.
  • the main object of the invention is to provide a method for the preparation of N- poly(alkenyl) acrylamides which overcomes the disadvantages of prior art discussed above.
  • the present invention provides novel N-poly(alkenyl) acrylamides having formula (I)
  • the present invention also provides a process for the preparation of N-poly(alkenyl) acrylamides of formula (1)
  • the acid catalyst includes but not limited to dilute sulfuric acid, dilute phosphoric acid, dilute hydrochloric acid and mixtures of concentrated sulfuric acid (98%) and acetic acid.
  • a solvent may be needed if Mn ⁇ 1000.
  • the convention method used for separating the product is filtration.
  • Yet another embodiment of the invention involves preparation of N-poly(alkenyl) acrylamides a polymerizable macromonomer, containing a hydrophobic alkyl group and a hydrophilic amide group in the same molecule.
  • the present invention provides novel N-poly(alkenyl) acrylamides having formula (I)
  • the process of the invention comprises reacting a vinylidene terminated poly( ⁇ - olefin) with acrylonitrile in presence of an acid catalyst at 50 - 75 0 C, in a solvent if the Mn of the polyolefin is ⁇ 1000, and for a period ranging between 1-12 hours to obtain the desired product and separating the product from the reaction mixture.
  • the preferred method of separation is by filtration.
  • the acid catalyst used in the process of the invention includes but is not limited to dilute sulfuric acid, dilute phosphoric acid, dilute hydrochloric acid and mixtures of concentrated sulfuric acid (98%) and acetic acid.
  • a solvent such as chlorobenzene is used.
  • the N-poly(alkenyl) acrylamides contains a hydrophobic alkyl group and a hydrophilic amide group in the same molecule.
  • the process for the present invention is described herein below with examples which are illustrative and should not be construed to limit the scope of the invention in any manner. All manipulations with the metallocene catalysts were carried out in a glove box under nitrogen, and high vacuum techniques were used where appropriate. Oligomerization of hexene-1 used in the examples was carried out using Cp 2 ZrCl 2 /MAO catalyst at different temperatures according to prior art methods (carbon numbers 20-500).
  • Oligomers of poly(hexene-l) with Mn varying from 500 - 10000 were obtained with variation in polymerization temperature from 50 to -20° C.
  • the number average molecular weight of poly(l -olefin) was measured by VPO as well as from NMR.
  • Functionality (Fn) of terminally unsaturated poly(l -olefin) was measured by the ratio of the number average molecular weight of poly(l -olefin) from VPO by the number average
  • the number average degree of Functionality (Fn) of N-poly(alkenyl) acrylamide was measured by the ratio of the number average molecular weight (Mn) of N-poly(alkenyl) acrylamide from VPO by the number average molecular weight of N-poly(alkenyl) acrylamide measured by 1 H NMR. Structural analysis was carried out by both 1 H and 13 C NMR. The peaks due acrylamide group were observed at 6.2, 5.5 and 5.2 ppm for the corresponding protons of CH 2 , CH and NH respectively in 1 H NMR.
  • the product was extracted with diethyl ether to obtain a yield of 6.0 g of a viscous liquid.
  • the number average molecular weight analysis of the product by VPO showed a value of 630.
  • the number average degree of functionality was calculated as 85 mol %.
  • the product was extracted with diethyl ether to obtain a yield of 5.4 g of a viscous liquid.
  • the number average molecular weight analysis of the product by VPO showed a value of 1080.
  • the number average degree of functionality (Fn) was found to be 80 mol %.
  • a two necked round bottom flask, fitted with a dropping funnel and reflux condenser was charged with 2.6 g (0.05 mol) of acrylonitrile and 70% H 2 SO 4 (2 mL) at room temperature and temperature was increased to 75 0 C.
  • Approximately 9.9 g (0.0055 mol) of liquid oligomer of poly(hexene-l) (Mn 1800) dissolved in 50 mL of chlorobenzene (as it was not free flowing liquid) was added drop wisely to the 250 mL round bottom flask. The addition was continued for a period of 1 hour. After the addition, the reaction was continued further for a period of 12 hours.
  • a two necked round bottom flask, fitted with a dropping funnel and reflux condenser was charged with 1.3 g (0.025 mol) of acrylonitrile and 70% H 2 SO 4 (2 mL) at room temperature and temperature was increased to 75 0 C.
  • Approximately 7.0 g (0.0025 mol) of liquid oligomer of poly(hexene-l) (Mn 2800) dissolved in 50 mL of chlorobenzene (as it was not free flowing liquid) was added drop wisely to the 250 mL round bottom flask. The addition was continued for a period of 1 hour. After the addition, the reaction was continued further for a period of 12 hours.
  • the reaction was worked up by addition of 40-50 mL of distilled water and both organic and aqueous layers were transferred into a separating funnel.
  • the product was extracted with diethyl ether to obtain a yield of 7.1 g of a viscous liquid.
  • the number average molecular weight analysis of the product by VPO showed a value of 2860.
  • the number average degree of functionality was calculated as 50 mol %.
  • the reaction was worked up by addition of 40-50 mL of distilled water and both organic and aqueous layers were transferred into a separating funnel.
  • the product was extracted with diethyl ether to obtain a yield of 4.0 g.
  • the number average molecular weight analysis of the product by VPO showed a value of 4340.
  • the number average degree of functionality was calculated as 36 mol %.
  • a two necked round bottom flask, fitted with a dropping funnel and reflux condenser was charged with 0.65 g (0.0125 mol) of acrylonitrile and 70% H 2 SO 4 (2 mL) at room temperature and temperature was increased to 75 0 C.
  • Approximately 7.0 g (0.001 mol) of liquid oligomer of poly(hexene-l) (Mn 6900) dissolved in 50 mL of chlorobenzene (as it was not free flowing liquid) was added drop wisely to the 250 mL round bottom flask. The addition was continued for a period of 1 hour. After the addition, the reaction was continued further for a period of 12 hours.
  • a two necked round bottom flask, fitted with a dropping funnel and reflux condenser was charged with 0.65 g (0.0125 mol) of acrylonitrile and 70% H 2 SO 4 (2 mL) at room temperature and temperature was increased to 75 0 C.
  • Approximately 10.0 g (0.001 mol) of liquid oligomer of poly(hexene-l) (Mn 10080) dissolved in 50 mL of chlorobenzene (as it was not free flowing liquid) was added drop wisely to the 250 mL round bottom flask. The addition was continued for a period of 1 hour. After the addition, the reaction was continued further for a period of 12 hours.
  • the reaction was worked up by addition of 40-50 mL of distilled water and both organic and aqueous layers were transferred into a separating funnel.
  • the product was extracted with diethyl ether to obtain a yield of 9.8 g.
  • the number average molecular weight analysis of the product by VPO showed a value of 12280.
  • the number average degree of functionality was calculated as 29 mol %.

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Abstract

The present invention relates to novel N-Poly (alkenyl) acryl amides of formula (I) where in m= 1-8, n=2-100 Formula (1) and to a process for preparation thereof by reacting an unsaturated poly(olefin) with acrylonitrile in presence of an acid catalyst.

Description

N-PoIy (alkenyl) acrylamides and process for preparation thereof Field of the invention
The present invention relates to novel N-PoIy (alkenyl) acryl amides and process for preparation thereof. More particularly, the present invention relates to a process of preparation of N-poly(alkenyl) acryl amides of formula (1) where in m = 1 - 8, n = 2 - 100
Figure imgf000002_0001
Formula (1)
Background of the invention
N-alkylacrylamides, such as N-isopropyl, N-fert-butylacrylamide and N-n- octylacrylamide, are of important classes of monomers for the synthesis of polymers, which are useful in applications such as sizing agents, rheology modifiers and water soluble polymers. Amongst these, N-isopropylacrylamide has assumed significant importance owing to the commercial importance of its polymer. Poly(N-isopropylacrylamide) has been widely studied for its novel thermal behaviour in aqueous media [Schild HG. Progress in Polymer Science. 17, 163 (1992)] and possesses inverse solubility upon heating, a property contrary to the behaviour of most polymers in organic solvents under atmospheric pressure near ambient temperature. Its macromolecular transition from a hydrophilic to hydrophobic structure occurs at what is known as lower critical solution temperature (LCST). Experimentally, this temperature lies between 30-350C, the exact temperature being a characteristic of the microstructure of the polymer. At molecular level, poly(N-isopropylacrylamide) has been used hi many forms including single chain, macroscopic gel, microgels, latex, thin film, membrane, coating, and fibres.
N-alkylacrylamides (alkyl = C6 to C18) are also widely used as comonomers for the preparation of hydrophobically modified polyelectrolytes [Glass JE, Polymers in aqueous mediaφerformance through association. ACS symposium series, 223. Washington: American Chemical Society, 1989 and Shalaby SW, McCormick CL, Glass JE. In: Shalaby SW, McCormick CL, Glass JE, editors. Water soluble polymers: synthesis, solution properties and applications. ACS symposium series 467. Washington: American Chemical Society, 1991}. These polymers consist of a water-soluble backbone containing a small proportion of hydrophobic groups (<3 mol%) usually in the form of pendant side chains or terminal groups. In aqueous solution the hydrophobic groups aggregate to minimize their exposure to water and, thereby, form hydrophobic microdomains in a fashion analogous to that of surfactants above their critical micelle concentration. Above a certain concentration (Cag), intermolecular hydrophobic interactions lead to the formation of a three dimensional network of polymer chains resulting in an increase in the apparent molecular weight and, consequently, a substantial viscosity enhancement.
Copolymers of N-alkylacrylamides with various other monomers are also finding diverse applications. For example, poly(N-dodecylacrylamide-co-N-methyl-4-vinyl pyridinium Na) is reported to be a useful as salt resistant viscosity builder [D. Christine, B. Alain andL. Pierre, Macromol. Symp. 102,233 (1995), D. Christine, B. Alain, B. Fransis and V. M. Laure, Polymer 36, 2095 (1995)], poly (N-stearoyl acrylamide-co-2-(3- acrylamidopropyl) dimethyl aminoethyl isoproply phosphate) is used as phosphatidylcholine analogous material /TK Yenfeng, C. Tianming, K. Masaya andN. Taiao, J.Polym. ScL Chem. Edn. 34, 449 (1996)], poly (N-tert-octylacrylamide-co-N-alkylacrylamide) has been employed as a thickener in cosmetics [J. Mondet and B. Lion Eur. Pat. Appl. EP 494, 022] and poly (N-octylacrylamide-co-3-acrylamido-3 -methyl butanoate Na) has been used for for oil recovery applications [A. Kitagmva and T. Koichi, Jpn. Kokai Tokkyo Koho JP 07,188,347]. N-alkylacrylamides are, thus, a useful class of monomers. In order to meet the growing demand and new applications of N-alkylacrylamides, various methods have been developed for their synthesis.
Some of these methods for the synthesis of N-alkylacrylamides include (1) reaction of acryloyl chloride with alkyl amine; (2) pyrolysis or thermal decomposition of carboxylic acid amides, and (3) reaction of iso-olefms with nitriles.
In the first method N-alkylacrylamides are prepared by reacting acryloyl chloride with the corresponding alkyl amines in the presence of an acid quencher i.e. triethyl amine at 0° C. [C. G. Overberger, C. Frazier and J. Mandehman, J. Am. Chem. Soc. 75,3326 (1953), J. LaI and G. S. Trick, J. Polym. ScI A2, 4559 (1964), E. F. Jr. Jordan, G. R. Riser and B. Artymyshyn, J. Appl. Polym. Sci. 13,1777 (1969), K. J. Shea, G. J. Stoddard, D. M. Shavelle, F. WaM and R. M. Chaote, Macromolecules 23,4497 (1990)].
In the second method N-alkylacrylamides are prepared by amidation of bicyclic carboxylic acids followed by the thermal decomposition of the carboxamide. For example, the reaction of dimethylamine with bicyclo [2.2.1]hept-2-ene-2-carboxylic acid in an autoclave gave N,N-dimethyl bicyclo [2.2.1]hept-2ene-2-carboxylic acid which was subjected to thermal decomposition at 200° C/vacuum to give N,N-dimethyl bicyclo [2.2.1]hept-2-ene-2-carboxamide [A. Ohshima and K. Tsubashima Jpn. Tokkyo Koho 7909 170, A. Oshima, K. Tsubashima and N. Takahashi Ger. Offen. 2,217,623]. In method (3) N-alkylacrylamides are prepared by reacting acrylonitrile with various iso-olefins. It is also known to synthesise N-tert-octylacrylamide by reacting acrylonitrile with 2,4,4-trimethyl-l-pentene at 40° C for 3 hours using 65% H2 SO4 as solvent [T. Takada, Y. Kawakatsu, T. Mihamisawa and K. Hara, Japan Kokai-739101 I].
A method for the preparation of N-alkylamides using 60% H2SO4 and cation exchange resin as catalysts have been disclosed [S.Sivaram, N. Kalyanam, Indpat. 158395 A and S.Sivaram, N. Kalyanam Ind. Pat. 158038 J.
The above methods are beset with many disadvantages. Method (1) cannot be used for preparation of higher N-alkyl acrylamides (where alkyl chain length > Cl 8) as alkylamines with >18 carbon atoms are not readily available. Besides, the method uses acryloyl chloride, which is an expensive and hazardous reagent and requires disposal of large quantities of chloride as waste.
Methods of type (2) suffer from the drawbacks of high temperatures, high vacuum and tedious work up procedures. This method is also applicable generally to only alkyl amides with small alkyl chain lengths. The reaction of olefins with nitriles is the most suitable general method for the synthesis of N-alkyl acrylamides and has been widely practiced. However, this method is restricted by the availability of suitable iso-olefins (isobutylene, 2,4,4-trimethyl-l-pentene etc) with carbon numbers less than eight or twelve.
It is therefore important to devise methods for the synthesis of N-alkylacrylamides which overcome the disadvantages of the prior art discussed above as well as create new N- alkylacrylamides in view of their growing importance in various fields of technology. Objects of the invention
The main object of the invention is to provide a method for the preparation of N- poly(alkenyl) acrylamides which overcomes the disadvantages of prior art discussed above.
It is another. object of the invention to provide novel N-poly(alkenyl) acrylamides with a wide range of applications. Summary of the invention.
Accordingly, the present invention provides novel N-poly(alkenyl) acrylamides having formula (I)
Figure imgf000005_0001
Formula (1) wherein m = 1 - 8, n = 2 - 100.
The compounds of formula (1) are obtained by the reaction of an unsaturated poly(olefm) of the formula CnH2m where n= 2 - 200 and m = 1 - 8, with acrylonitrile hi presence of an acid catalyst.
The present invention also provides a process for the preparation of N-poly(alkenyl) acrylamides of formula (1)
Figure imgf000005_0002
Formula (1) wherein m = 1-8, n = 2-100, which comprises reacting a vinylidene terminated poly(α-olefm) with acrylonitrile in presence of an acid catalyst at 50 - 750C, in a solvent if Mn < 1000, and for a period ranging between 1-12 hours to obtain the desired product and separating the product from the reaction mixture. In one of the embodiments of the present invention, vinylidene terminated poly(α- olefin) has a general formula CnH2m wherein m = 1-8, n = 2-100 and are prepared by the polymerization of α-olefins using an organometallic catalyst system.
In another embodiment of the present invention, the acid catalyst includes but not limited to dilute sulfuric acid, dilute phosphoric acid, dilute hydrochloric acid and mixtures of concentrated sulfuric acid (98%) and acetic acid.
In yet another embodiment a solvent may be needed if Mn < 1000.
In a feature of the present invention, the convention method used for separating the product is filtration. Yet another embodiment of the invention involves preparation of N-poly(alkenyl) acrylamides a polymerizable macromonomer, containing a hydrophobic alkyl group and a hydrophilic amide group in the same molecule. Detailed description of the invention
The present invention provides novel N-poly(alkenyl) acrylamides having formula (I)
Figure imgf000006_0001
Formula (1) wherein m = 1 - 8, n = 2 - 100. In accordance with the process of the invention, the compounds of formula (1) are obtained by the reaction of an unsaturated poly(olefin) of the formula CnH2nI where n= 2 - 200 and m = 1 - 8, with acrylonitrile in presence of an acid catalyst. The process of the invention comprises reacting a vinylidene terminated poly(α- olefin) with acrylonitrile in presence of an acid catalyst at 50 - 750C, in a solvent if the Mn of the polyolefin is < 1000, and for a period ranging between 1-12 hours to obtain the desired product and separating the product from the reaction mixture. The preferred method of separation is by filtration.
The vinylidene terminated poly(α-olefm) has a general formula CnH2m where m = 1-8 and n = 2-100 and are prepared by the polymerization of α-olefins using an organometallic catalyst system.
The acid catalyst used in the process of the invention includes but is not limited to dilute sulfuric acid, dilute phosphoric acid, dilute hydrochloric acid and mixtures of concentrated sulfuric acid (98%) and acetic acid. As explained above if the Mn of the polyolefin is < 1000, a solvent such as chlorobenzene is used.
The N-poly(alkenyl) acrylamides contains a hydrophobic alkyl group and a hydrophilic amide group in the same molecule. The process for the present invention is described herein below with examples which are illustrative and should not be construed to limit the scope of the invention in any manner. All manipulations with the metallocene catalysts were carried out in a glove box under nitrogen, and high vacuum techniques were used where appropriate. Oligomerization of hexene-1 used in the examples was carried out using Cp2ZrCl2/MAO catalyst at different temperatures according to prior art methods (carbon numbers 20-500). Oligomers of poly(hexene-l) with Mn varying from 500 - 10000 were obtained with variation in polymerization temperature from 50 to -20° C. The number average molecular weight of poly(l -olefin) was measured by VPO as well as from NMR. The number average degree of
Functionality (Fn) of terminally unsaturated poly(l -olefin) was measured by the ratio of the number average molecular weight of poly(l -olefin) from VPO by the number average
, molecular weight of poly( 1 -olefin) from NMR.
The reaction of vinylidene terminated poly(hexene-l) with acrylonitrile was carried out by a solvent free method for low molecular weight oligomers (Mn < 1000). However, for higher molecular weight polymers, the reaction was carried out in chlorobenzene.
The number average degree of Functionality (Fn) of N-poly(alkenyl) acrylamide was measured by the ratio of the number average molecular weight (Mn) of N-poly(alkenyl) acrylamide from VPO by the number average molecular weight of N-poly(alkenyl) acrylamide measured by 1H NMR. Structural analysis was carried out by both 1H and 13C NMR. The peaks due acrylamide group were observed at 6.2, 5.5 and 5.2 ppm for the corresponding protons of CH2, CH and NH respectively in 1H NMR.
Example-1
A two necked round bottom flask, fitted with a dropping funnel and reflux condenser was charged with 5.2g (0.1 mol) of acrylonitrile and 70% H2SO4 (2 mL) at room temperature.
After the addition, temperature was increased to 750C, followed by addition of 3.8 g (0.01 mol) of liquid oligomer of poly(hexene-l) (Mn = 380) from dropping funnel. The addition was continued for a period of 1 hour. After the addition, the reaction was continued for a period of 12 hours. The reaction was worked up by addition of 10-15 mL of distilled water and both organic and aqueous layers were transferred into a separating funnel. The product was extracted with diethyl ether to obtain a yield of 4.2 g of a viscous liquid. The number average molecular weight analysis of the product by VPO showed a value of 440. The number average degree of functionality (Fn) was found to be 90 mol %.
ExampIe-2 A two necked round bottom flask, fitted with a dropping funnel and reflux condenser was charged with 5.2g (0.1 mol) of acrylonitrile and 70% H2SO4 (2 mL) at room temperature. After the addition, temperature was increased to 750C, followed by addition of 5.5 g (0.01 mol) of liquid oligomer of poly(hexene-l) (Mn = 550) from dropping funnel. The addition was continued for a period of 1 hour. After the addition, the reaction was continued for a period of 12 hours. The reaction was worked up by addition of 10-15 mL of distilled water and both organic and aqueous layers were transferred into a separating runnel. The product was extracted with diethyl ether to obtain a yield of 6.0 g of a viscous liquid. The number average molecular weight analysis of the product by VPO showed a value of 630. The number average degree of functionality was calculated as 85 mol %.
ExampIe-3
A two necked round bottom flask, fitted with a dropping funnel and reflux condenser was charged with 2.6 g (0.05 mol) of acrylonitrile and 70% H2SO4 (2 mL) at room temperature. After the addition, temperature was increased to 750C, followed by addition of 5.0 g (0.005 mol) of liquid oligomer of poly(hexene-l) (Mn = 1000) from dropping funnel. The addition was continued for a period of 1 hour. After the addition, the reaction was continued for a period of 12 hours. The reaction was worked up by addition of 10-15 mL of distilled water and both organic and aqueous layers were transferred into a separating funnel. The product was extracted with diethyl ether to obtain a yield of 5.4 g of a viscous liquid. The number average molecular weight analysis of the product by VPO showed a value of 1080. The number average degree of functionality (Fn) was found to be 80 mol %.
ExampIe-4
A two necked round bottom flask, fitted with a dropping funnel and reflux condenser was charged with 2.6 g (0.05 mol) of acrylonitrile and 70% H2SO4 (2 mL) at room temperature and temperature was increased to 750C. Approximately 9.9 g (0.0055 mol) of liquid oligomer of poly(hexene-l) (Mn = 1800) dissolved in 50 mL of chlorobenzene (as it was not free flowing liquid) was added drop wisely to the 250 mL round bottom flask. The addition was continued for a period of 1 hour. After the addition, the reaction was continued further for a period of 12 hours. The reaction was worked up by addition of 40-50 mL of distilled water and both organic and aqueous layers were transferred into a separating funnel. The product was extracted with diethyl ether to obtain a yield of 9.2 g of a viscous liquid. The number average molecular weight analysis of the product by VPO showed a value of 1860. The number average degree of functionality was calculated as 62 mol %. Example-5
A two necked round bottom flask, fitted with a dropping funnel and reflux condenser was charged with 1.3 g (0.025 mol) of acrylonitrile and 70% H2SO4 (2 mL) at room temperature and temperature was increased to 750C. Approximately 7.0 g (0.0025 mol) of liquid oligomer of poly(hexene-l) (Mn = 2800) dissolved in 50 mL of chlorobenzene (as it was not free flowing liquid) was added drop wisely to the 250 mL round bottom flask. The addition was continued for a period of 1 hour. After the addition, the reaction was continued further for a period of 12 hours. The reaction was worked up by addition of 40-50 mL of distilled water and both organic and aqueous layers were transferred into a separating funnel. The product was extracted with diethyl ether to obtain a yield of 7.1 g of a viscous liquid. The number average molecular weight analysis of the product by VPO showed a value of 2860. The number average degree of functionality was calculated as 50 mol %.
Example-6 A two necked round bottom flask, fitted with a dropping funnel and reflux condenser was charged with 0.65 g (0.0125 mol) of acrylonitrile and 70% H2SO4 (2 mL) at room temperature and temperature was increased to 750C. Approximately 4.3 g (0.001 mol) of liquid oligomer of poly(hexene-l) (Mn = 4300) dissolved in 25 mL of chlorobenzene (as it was not free flowing liquid) was added drop wisely to the 250 mL round bottom flask. The addition was continued for a period of 1 hour. After the addition, the reaction was continued further for a period of 12 hours. The reaction was worked up by addition of 40-50 mL of distilled water and both organic and aqueous layers were transferred into a separating funnel. The product was extracted with diethyl ether to obtain a yield of 4.0 g. The number average molecular weight analysis of the product by VPO showed a value of 4340. The number average degree of functionality was calculated as 36 mol %.
Example-7
A two necked round bottom flask, fitted with a dropping funnel and reflux condenser was charged with 0.65 g (0.0125 mol) of acrylonitrile and 70% H2SO4 (2 mL) at room temperature and temperature was increased to 750C. Approximately 7.0 g (0.001 mol) of liquid oligomer of poly(hexene-l) (Mn = 6900) dissolved in 50 mL of chlorobenzene (as it was not free flowing liquid) was added drop wisely to the 250 mL round bottom flask. The addition was continued for a period of 1 hour. After the addition, the reaction was continued further for a period of 12 hours. The reaction was worked up by addition of 40-50 mL of distilled water and both organic and aqueous layers were transferred into a separating funnel. The product was extracted with diethyl ether to obtain a yield of 6.9 g. The number average molecular weight analysis of the product by VPO showed a value of 6980. The number average degree of functionality was calculated as 33 mol %. Example-8
A two necked round bottom flask, fitted with a dropping funnel and reflux condenser was charged with 0.65 g (0.0125 mol) of acrylonitrile and 70% H2SO4 (2 mL) at room temperature and temperature was increased to 750C. Approximately 10.0 g (0.001 mol) of liquid oligomer of poly(hexene-l) (Mn = 10080) dissolved in 50 mL of chlorobenzene (as it was not free flowing liquid) was added drop wisely to the 250 mL round bottom flask. The addition was continued for a period of 1 hour. After the addition, the reaction was continued further for a period of 12 hours. The reaction was worked up by addition of 40-50 mL of distilled water and both organic and aqueous layers were transferred into a separating funnel. The product was extracted with diethyl ether to obtain a yield of 9.8 g. The number average molecular weight analysis of the product by VPO showed a value of 12280. The number average degree of functionality was calculated as 29 mol %.

Claims

We Claim:
1. N-poly(alkenyl) acrylamides having formula (I)
Figure imgf000011_0001
CH2 CH2
T π* H H ™
Formula (1) wherein m = l - 8, n = 2 - 100.
2. A process for the preparation of a N-poly(alkenyl) acrylamide of formula (I)
Figure imgf000011_0002
Formula (1) wherein m = 1 - 8, n = 2 - 100, comprising reacting an unsaturated poly(olefin) of the formula CnH2m wherein m = 1 - 8, n = 2 - 100, with acrylonitrile in presence of an acid catalyst to obtain the N-poly(alkenyl) acrylamide.
3. A process as claimed in claim 2 wherein the reaction is carried out in the absence of a solvent.
4. A process as claimed in claim 2 wherein the unsaturated polyolefin is a vinylidene terminated poly(α-olefin).
5. A process as claimed in claim 2 wherein the unsaturated polyolefin is reacted with acrylonitrile in the presence of an acid catalyst at a temperature in the range of 50 - 750C, and using a solvent if the Mn of the unsaturated polyolefin is < 1000, and for a period in the range of 1-12 hours.
6. A process as claimed in claim 2 wherein the acid catalyst is selected from the group consisting of dilute sulfuric acid, dilute phosphoric acid, dilute hydrochloric acid and mixtures of concentrated sulfuric acid (98%) and acetic acid.
7. A process as claimed in claim 2 wherein a solvent is used if the Mn of the unsaturated polyolefin < 1000.
8. A process as claimed in claim 7 where the solvent is chlorobenzene.
9. A process as claimed in claim 2 wherein the N-poly(alkenyl) acrylamide is separated by filtration.
10. A process as claimed in claim 4 wherein the vinylidene terminated poly(α-olefin) is selected from the group consisting of poly(butene-l), poly(hexene-l), poly(octene-l), poly(decene-l), poly(dodecene-l) and poly(octadecene-l) and which are prepared by the polymerization of the corresponding α-olefm of the formula CmH2m where m = 4,6,8,10 or 12.
11. A process as claimed in claim 2 wherein the poly(α-olefin) have a number average molecular weight in the range of 400 to 20000.
PCT/IB2004/002893 2004-09-07 2004-09-07 N-poly (alkenyl) acrylamides and process for preparation thereof WO2006027635A1 (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2573673A (en) * 1950-05-27 1951-10-30 John J Ritter Method of producing n-mono substituted imidic compounds
US3151157A (en) * 1964-09-29 Process for the preparation of
US3161679A (en) * 1964-12-15 Process for the preparation of
US3170951A (en) * 1963-05-23 1965-02-23 American Cyanamid Co Process for the preparation of sulfo-n-alkylpropionamides
US3317589A (en) * 1963-04-19 1967-05-02 American Cyanamid Co Alkali metal sulfo-n-alkylpropionamides
GB1103876A (en) * 1964-06-02 1968-02-21 Eastman Kodak Co The manufacture of n-substituted acrylamides
EP0004362A2 (en) * 1978-03-20 1979-10-03 Thiokol Corporation Ultraviolet radiation curable composition and textile articles produced therefrom
US4395524A (en) * 1981-04-10 1983-07-26 Rohm And Haas Company Acrylamide copolymer thickener for aqueous systems

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151157A (en) * 1964-09-29 Process for the preparation of
US3161679A (en) * 1964-12-15 Process for the preparation of
US2573673A (en) * 1950-05-27 1951-10-30 John J Ritter Method of producing n-mono substituted imidic compounds
US3317589A (en) * 1963-04-19 1967-05-02 American Cyanamid Co Alkali metal sulfo-n-alkylpropionamides
US3170951A (en) * 1963-05-23 1965-02-23 American Cyanamid Co Process for the preparation of sulfo-n-alkylpropionamides
GB1103876A (en) * 1964-06-02 1968-02-21 Eastman Kodak Co The manufacture of n-substituted acrylamides
EP0004362A2 (en) * 1978-03-20 1979-10-03 Thiokol Corporation Ultraviolet radiation curable composition and textile articles produced therefrom
US4395524A (en) * 1981-04-10 1983-07-26 Rohm And Haas Company Acrylamide copolymer thickener for aqueous systems

Non-Patent Citations (1)

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Title
CLARKE, T. ET AL: "Application of the Ritter reaction to .alpha.- olefins", JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY , 41(1), 78-82 CODEN: JAOCA7; ISSN: 0003-021X, 1964, XP009048098 *

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