US3278478A - Vinyl resins plasticized with trisubstituted nitrilotripropionates - Google Patents

Vinyl resins plasticized with trisubstituted nitrilotripropionates Download PDF

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US3278478A
US3278478A US429887A US42988765A US3278478A US 3278478 A US3278478 A US 3278478A US 429887 A US429887 A US 429887A US 42988765 A US42988765 A US 42988765A US 3278478 A US3278478 A US 3278478A
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parts
nitrilotripropionate
vinyl
nitrilotripropionates
trisubstituted
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James E Masterson
David H Clemens
Jr Arthur W Ritter
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Rohm and Haas Co
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Rohm and Haas Co
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Priority to BE642774A priority Critical patent/BE642774A/xx
Priority to FR961224A priority patent/FR1386626A/fr
Priority to NL6400875A priority patent/NL6400875A/xx
Priority to GB12385/64A priority patent/GB1043054A/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
    • C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
    • C07D307/04—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having no double bonds between ring members or between ring members and non-ring members
    • C07D307/10—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having no double bonds between ring members or between ring members and non-ring members with substituted hydrocarbon radicals attached to ring carbon atoms
    • C07D307/12—Radicals substituted by oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/17—Amines; Quaternary ammonium compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/17—Amines; Quaternary ammonium compounds
    • C08K5/175—Amines; Quaternary ammonium compounds containing COOH-groups; Esters or salts thereof

Definitions

  • This invention deals with trisubstituted nitrilotripropionates, processes for making these compounds, and resinous compositions. This invention also deals With disubstituted iminodipropionates and processes for making these compounds.
  • the trisubstituted nitrilotripropionates of the invention may be represented by the formula:
  • R represents a non-acetylenically unsaturated hydrocarbon group.
  • R represents a non-acetylenically unsaturated hydrocarbon group.
  • Typical thereof are ahe following: aryl, aralkyl, alkaryl, alkyl, and alkylene. Each of these groups generally has a minimum content of 6 carbon atoms and a maximum content of 18 carbon atoms;
  • R represents a non-acetylenically unsaturated hydrocarbon group. Typical thereof are the following: aryl, aralkyl, alkaryl, alkyl, and alkylene. Each of these groups generally has a minimum content of 6 carbon atoms and a maximum content of 18 carbon atoms;
  • R represents a non-acetylenically unsaturated hydrocarbon group. Typical thereof are the following: aryl, aralkyl, alkaryl, alkyl, and alkylene. Each of these groups generally has a minimum content of 6 carbon atoms and a maximum content of 18 carbon atoms.
  • the total carbon atom content of R R and R taken collectively be no less that 20 carbon atoms and no more than carbon atoms.
  • R R and R need not all be the same; they may all be different or two of the three substituents may be the same; all three may be the same.
  • R R and R are the following: 2-ethylbutyl, n-hexyl, sec-hexyl, n-octyl, isooctyl, 2-ethylhexyl, 2-ethylisohexyl, tert-octyl, isodecyl, n-decyl, stearyl, benzyl, palmityl, oleyl, monochlorobenzyl, dichlorobenzyl, nitrobenzyl, phenethyl, 6- phenylhexyl, and tetrahydrofurfuryl.
  • R R and R include mixtures of unsaturated and saturated substituents derived from the selective reduction of vegetable and animal fats and oils, such as tallow, soybean oil, safflower oil, linseed oil, and the like. They are commonly mixtures of palmityl, stearyl, oleyl, linoleyl, and linolenyl groups in various proportions, depending on the initial composition of the fat or oil and the degree of selectivity of the reduction.
  • Typical of the trisubstituted nitrilotripropionates of the invention are the following: trihexyl nitrilotripropionate, tri-Z-ethylhexyl nitrilotripropionate, tri-n-octyl, nitrilotripropionate, triisooctyl nitrilotripropionate, tri-n-decyl nitrilotripropionate, diisodecyl nitrilotripropionate, tristearyl nitrilotripropionate, tripalmityl nitrilotripropionate, tribenzyl nitrilotripropionate, tritetrahydrofurfuryl nitrilotripropionate, t-riphenethyl nitrilotripropionate, dioctylmonobutyl nitrilotripropionate, distearylmonobutyl Patented Oct.
  • a particularly valuable group of the compounds of the invention is the trialkyl nitrilotripropionates in which the alkyl groups may be all the same or different.
  • the process for preparing the trisubstituted nitrilotripropionates of the invention comprises reacting an acrylate ester of the formula with ammonia.
  • R is as defined above.
  • the resulting trisubstituted nitrilotripropionates of the invention have R substitutents which are dissimilar.
  • the molar ratio of acrylate to ammonia should be at least 3 to 1.
  • the temperature at which the reaction proceeds may vary widely. It may range broadly from about 0 C. to the temperature at which the formation of the amide from the acrylate predominates over the addition reaction across the double bond of the acrylate to form the ester. Generally, the temperature is in the range of 5 to 150 C., and more preferably in the range of 30 to C. For best results, it is very advisable to continue heating the reaction mixture after essentially all of the ammonia has been consumed. Usually heating is carried out at a temperature higher than that at which the reaction between the ammonia and the acrylate ester proceeds. Such heating temperature ranges from 50 to 100 C. or higher.
  • iminodipropionates may be represented by the following formula 0 H 0 H 0 0 o R 011 01-1 0 0011 (III) wherein R and R are as defined above in conjunction with the nitrilotripropionates.
  • the reaction between the acrylate ester and ammonia proceeds preferably in the presence of a solvent for the ammonia.
  • Typical solvents are: methanol, ethanol, propanol, butanol, dimethyl sulfoxide, dimethyl formamide, tetrahydrofuran, ethylene glycol, dimethyl ether, 2-methoxyethanol, 2-butoxyethanol, and diethylene glycol.
  • a catalyst selected from the group consisting of salts of alkaline and alkaline earth metals (metals from Groups IA and IIA of the Periodic Table) and compounds of the generic formula where R R R and R are hydrogen, alkyl, aryl, or aralkyl, and X is an anion whose conjugate acid has a dissociation constant greater than 10-
  • Examples of catalysts are the following: ammonium formate, ammonium acetate, ammonium butyrate, ammonium chloride, monomethyl ammonium chloride, monomethyl ammonium acetate, tributyl ammonium sulperiod and held at that temperature for six hours.
  • trioctyl ammonium iodide tetramethyl ammonium butyrate, tetrabutyl ammonium acetate, tetrabutyl ammonium chloride, lithium chloride, lithium acetate potassium chloride, sodium acetate, sodium pr-opionate, sodium dichloroace-tate, magnesium acetate, strontium trichloroacetate, and the like.
  • the catalyst is soluble in the reaction medium.
  • the catalyst is employed in catalytic amount, i.e., that amount which increases the speed of the reaction. Generally, an amount in the range of .05 to 5% of the total weight of the reactants is used.
  • the catalyst has been consumed. But, the catalyst may also be present during the reaction of the ammonia and the acrylate.
  • a transesterification process which comprises reacting trisubstituted nitrilotripropionates of the formula Ia /C HzCHzC O lower alkyl N-OH Clfl C O 0 lower alkyl CHgCHzC O 0 lower alkyl (Ia) with at least one alcohol of the formula R OH (V)
  • lower alkyl is taken to mean an alkyl group of 1 to 4 carbon atoms.
  • the lower alkyl group is an alkyl group of 1 to 2 carbon atoms.
  • the R substituent may represent a nonacetylenically unsaturated aliphatic hydrocarbon group.
  • Typical thereof are the following: aralkyl, alkyl, and alkylene. These groups generally have a minimum carbon atom content of 6 atoms and a maximum carbon atom content of 12 to 18 with a maximum of 12 carbon atoms being preferred.
  • the particular group which R represents is so selected as to be different and of substantailly higher molecular weight than the lower alkyl groups in Formula Ia.
  • Alcohols typical of R OH are the following: n-hexyl alcohol, Z-ethylbutyl alcohol, n-octyl alcohol, isooctyl alcohol, 2-ethylhexyl alcohol, n-decyl alcohol, 2-ethylisohexyl alcohol, isodecyl alcohol, stearyl alcohol, palmityl alcohol, benzyl alcohol, tetrahydrofurfuryl alcohol, oleyl acohol, phenethyl alcohol, and others.
  • This embodiment of the invention provides a process for making, in essentially quantiative yields, trisubstituted nitrilotripropionates in which the alcohol moiety of the ester is of higher molecular weight than that of the acrylate ester by reacting ammonia and the acrylate ester and then reacting the nitrilotripropionate with an appropriate alcohol.
  • these alcohols may be used individually or in any mixture thereof. Where the alcohols are used in a mixture, the resulting trisubstituted nitrilotripropionates have R R and R which are different, the respective ratios R R and R depending therefor on the particular ratio of alcohols used.
  • the product is purified by suitable methods, as by distillation, removal of excess reactants, such as the alcohols and the acrylate.
  • Hg stands for mercury
  • EXAMPLE 1 There are charged to a two-liter reactor parts of ammonium acetate and 75.0 parts of methanol. There are added in portions over a two-hour period 451.0 parts of methyl acrylate and 27.2 parts of ammonia. The temperature is raised gradually to 70 C. over a one-hour The product is stripped of volatile materials to a temperature of 100 C. at 0.15 mm. Hg. The product (441.8 parts) is essentially pure trimethyl nitrilotripropionate having a neutralization equivalent of 273.73.
  • EXAMPLE 4 A stirred two-liter reactor equipped with a dropping funnel and gas inlet tube is charged with 4.30 parts of lithium chloride. The flask is evacuated to 5 mm. of Hg and 75 ml. (60 parts) of methanol is charged followed by a total of 500 parts of ethyl acrylate and 27.1 parts of ammonia which are added in portions over about a six-hour period while maintaining the temperature between 18 and 38 C. The reaction mixture is allowed to stir for 16 hours at room temperature. An additional 4.3 parts of lithium chloride is added and the reaction mixture heated at a temperature of 70 C. for 3 hours and then stripped of methanol and excess ethyl acrylate at a temperature of C. and a pressure of 0.35 mm. of Hg. There remains 480 parts of almost pure triethyl nitrolotripropionate having a neutralization equivalent of 315 compared to theory of 317.4.
  • EXAMPLE 7 A stirred two-liter reactor equipped with a dropping funnel and gas inlet tube is charged with 4.30 parts of lithium chloride. The flask is evacuated to 5 mm. of Hg and 75 parts of methanol charged, followed by a total of 430.1 parts of n-butyl acrylate and 21.4 parts of ammonia which are added in portions over about a 7-hour period while maintaining the temperature between 28 C. and 35 C. The reaction mixture of di-nbutyl iminodipropionate and tri-n-butyl nitrilotripropionate is allowed to stir for 13 hours at room temperature. An additional 4.30 parts of lithium chloride is added and the reaction mixture heated at a temperature of 70 to 75 C. for 3 hours and then stripped of methanol and excess butyl acrylate at a temperature of 100 C. and a pressure of 0.25 mm. of Hg. The product which is obtained is tri-n-butyl nitrilotripropionate.
  • EXAMPLE 10 A stirred two-liter reactor equipped with a dropping funnel and gas inlet tube is charged with 4.30 parts of lithium chloride. The flask is evacuated to 5 mm. of Hg and 150 ml. parts) of methanol charged, followed by a total of 430.1 parts of 2-ethylhexyl acrylate and 13.1 parts of ammonia which are added in portions over about a 6-hour period while maintaining the temperature betwen 28 and 35 C. The reaction The procedure of Example is followed but omitting the lithium chloride. The same product is obtained.
  • Example 13 The procedure of Example 13 is followed replacing the catalyst by aluminum triisopropoxide. The same product is obtained.
  • Examples 16 to 27 illustrate the preparation of various higher molecular weight nitrilotripropionates from the corresponding lower ester.
  • EXAMPLE 13 There are charged to a 500 ml. reactor arranged for distillation 98.6 parts of trimethyl nitrilotripropionate, 1 86 parts of Z-ethylhexanol, and 0.5 part of a sodium hydrogen titanium mixed alkoxide.
  • the pressure is reduced to 99-106 mm. of Hg and the reaction mixture heated to 92-116 C. After three hours, the pressure is reduced to 41 to 50 mm. of Hg and the reaction mixture maintained at 1l8120 C. for two hours. The pressure is then reduced to 24 mm. of Hg with the temperature at -117 C. The pressure is returned to atmospheric and 0.20 part of acetic acid and 0.40 part of water are added.
  • the mixture is heated at 8095 C.
  • the product (202.8 parts) is tri-Z-ethylhexyl nitrilotripropionate and has a refractive index of 1.4295 at 25 C.
  • the esters of the invention are valuable plasticizers for polyvinyl halide resins.
  • polyvinyl halide resin refers to polymers containing a predominant quantity, that is, a quantity greater than 50%, generally over 60%, by weight of the monomer as vinyl halide units. This includes the homopolymers of the vinyl halides as well as the copolymers and interpolymers of a vinyl halide and an unsaturated monomer copolymerizable therewith.
  • vinyl aromatic compounds for example, styrene; esters of a,/3-unsaturated carboxylic acids, for example, the methyl, ethyl, butyl, amyl, hexyl, octyl esters of maleic, crotonic, itaconic, fumarie acids and the like.
  • copolymers are those obtained by copolymerization of vinyl chloride with an ester of an a,fl-unsaturated dicar-boxylic acid, such as diethyl maleate or other esters of maleic, fumaric, aconitric, itaconic acid, etc., in which 5 to 20 parts by weight of diethyl maleate or other analogous esters are used for every 95 to 80 parts by weight of vinyl chloride.
  • an ester of an a,fl-unsaturated dicar-boxylic acid such as diethyl maleate or other esters of maleic, fumaric, aconitric, itaconic acid, etc.
  • esters of the invention are employed as plasticizers for polyvinyl halide resins, they are ordinarily incorporated into the vinyl halide polymers by mixing the powdered resin with the liquid plasticizer followed by mixing and/or kneading and then by curing the mix at an elevated temperature, for example, within the range from 150 to 200 C., on hot rolls or in a heated mixer, such as a Werner-Pfieiderer or Banbury mixer.
  • the proportion of esters that may be employed may vary over a great range since it is dependent on the particular esters of this invention which is selected, the specific polyvinyl halide resin to be plasticized, and the final degree of plasticization desired in the resin, this factor in itself being dependent on the ultimate application intended for the resin.
  • esters in a plasticizing amount for most purposes, this being from about 5 to 100 parts, and more commonly from 20 to 60 parts, of esters per 100 parts of resin. In amounts from 60 to about 150 parts of ester per 100 parts of polyvinyl chloride resin, as from 60 to 90 parts, the esters of the invention are more commonly suitable for use in organosols and plastisols. One or more esters may be used in the polyvinyl halide resin.
  • esters of this invention in polyvinyl halide compositions; also the esters of the invention may be employed as the sole plasticizer; or they may be employed in conjunction with conventional plasticizers, such as alkyl phthalates, alkyl phosphates, monomeric or polymeric epoxides, and other plasticizers known in the art.
  • polyvinyl halide resin there may be incorporated various stabilizers, fillers, dyes, pigments, and the like.
  • esters of the invention is further demonstrated by the following illustrations.
  • a standard resinous composition is made up from the following ingredients.
  • the resinous compositions are evaluated in accordance with tests further described hereinafter.
  • the above formulations are modified by replacing polyvinyl chloride by copolymers of (A) 87 parts vinyl chloride: 13 parts vinyl acetate (B) parts vinyl chloridezZO parts vinylidene chloride (C) 80 parts vinyl chloride:20 parts methyl acrylate (D) 95 parts vinyl chloride:5 parts vinyl isobutyl ether
  • the resinous compositions are tested as described above. All compositions are supple and flexible, and they exhibit good low temperature flexibility allied with good resistance to high temperature conditions.
  • plasticized polyvinyl chloride compositions of the invention are useful for many outdoor uses, such as greenhouse glazing, pond liners, ditch liners and silo covers.
  • the compositions are well suited for many automotive applications, such as door panels, crash pad covers, and gasketing; for jacketing for electrical cables and many others.
  • nitrilotripropionates of the invention are, furthermore, unique in their performance in plastisols in combining excellent gelation and fusion behavior with out standing viscosity stability.
  • a typical plastisol composition comprising 100 parts of finely divide-d polyvinyl chloride, 3 parts of a Ba/Cd/Zn complex stabilizer and parts of tri-2-ethylhexyl nitrilopropionate was mixed for 15 minutes in a Hobart mixer and then deaerated at 28 in. of Hg for 10 minutes.
  • the viscosity of the plastisol was 17 poises at 60 r.p.m. after aging one day at 77 F.
  • a comparative composition with di-(2-ethylhexyl)phthalate ('DOP) had an 18 poise/60 r.p.m. viscosity.
  • the viscosity of the composition with DOP had risen to 29.
  • the viscosity of the nitrilotripropionate composition had decreased to 12 poise.
  • the viscosity for the nitrilotripropionate after one day was 7 poises/60 r.p.m.
  • the composition with DOP was 20.
  • the nitrilotripropionate composition was 5; the DOP had a viscosity which increased to 56.
  • the plastisol of the invention showed remarkable viscosity stability.
  • the trem plastisol is well known in the art. See Modern Plastics, vol. 29, page 87 (1951), and US. Patent No. 3,050,412, col. 3, lines 48-67, for instance.
  • TESTS Test 1Sh0re hardness A Shore A durorneter, under a weight of 3 pounds, is applied to the test specimens. A recording is made at once and after 10 seconds; and the hardness is expressed by the two values, of which the first recording is the higher.
  • T of T The temperature at which a specimen has a torsional modulus of 135,000 lbs/sq. in., known as T of T is determined. This roughly corresponds to the brittle point obtained by cantilever apparatus.
  • Test 3Activated carbon v0latility.2" squares of weighed specimens are placed between 2-inch layers of activated carbon in sealed glass jars, which are maintained at 90 C. for 24 hours. The specimens are removed, dusted free of carbon and reweighed.
  • Test 4S0apy water extractio-n.3" squares of weighed specimens are immersed in a 1% aqueous solution of Ivory soap at 90 C. for 24 hours, after which they are thoroughly washed, dried, and reweighed.
  • Percent plasticizer loss is calculated.
  • the cardboard sheets are examined qualitatively for evidence of plasticizer or plasticizing stabilizer stains.
  • a resinous vinyl chloride composition comprising a vinyl chloride polymer selected from the group consisting of homopolymers of vinyl chloride and copolymers of 50 to 95 percent by weight vinyl chloride and from 50 to percent by weight of a monoethylenically unsaturated monomer copolymerizable therewith, said polymer being plasticized with a trisubstituted nitrilotripropionate of the formula NOH;OH OOOR OH OH COOR in which each of R R and R is an alkyl group of 8 carbon atoms.
  • a vinyl plastisol composition comprising a vinyl chloride resin selected from the group consisting of homopolymers of vinyl chloride and copolymers of to percent by weight vinyl chloride and from 50 to 5 percent by weight of a monoethylenically unsaturated monomer copolymerizable therewith, and tri(2-ethylheXyl)nitrilotripropionate plasticizer.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
US429887A 1963-04-02 1965-02-02 Vinyl resins plasticized with trisubstituted nitrilotripropionates Expired - Lifetime US3278478A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE642774A BE642774A (en(2012)) 1963-04-02 1964-01-21
FR961224A FR1386626A (fr) 1963-04-02 1964-01-22 Compositions résineuses de nitrilopropionates et de polyvinyle
NL6400875A NL6400875A (en(2012)) 1963-04-02 1964-02-03
GB12385/64A GB1043054A (en) 1963-04-02 1964-03-24 Plasticizing esters and plasticized resinous compositions
US429887A US3278478A (en) 1963-04-02 1965-02-02 Vinyl resins plasticized with trisubstituted nitrilotripropionates

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US26985563A 1963-04-02 1963-04-02
US29646163A 1963-07-22 1963-07-22
US429887A US3278478A (en) 1963-04-02 1965-02-02 Vinyl resins plasticized with trisubstituted nitrilotripropionates

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104252A (en) * 1977-09-26 1978-08-01 Borg-Warner Corporation Olefin polymer stabilizer
US4563478A (en) * 1981-05-26 1986-01-07 Hepar Chimie S.A. Method of tranquilizing
US5300235A (en) * 1991-02-08 1994-04-05 Exxon Chemical Patents Inc. Corrosion inhibitors
US5427999A (en) * 1991-06-28 1995-06-27 Exxon Chemical Patents Inc. Amine adducts as corrosion inhibitors
WO1996038528A1 (en) * 1995-06-01 1996-12-05 The Procter & Gamble Company Betaine esters for delivery of alcohols
WO1997016407A1 (en) * 1995-11-02 1997-05-09 The Procter & Gamble Company Beta-amino ester compounds of perfume alcohols
JP2019182867A (ja) * 2011-10-27 2019-10-24 Massachusetts Institute Of Technology 薬物内包微小球の形成が可能なｎ−末端で官能基化されたアミノ酸誘導体
US10933139B2 (en) 2011-03-28 2021-03-02 Massachusetts Institute Of Technology Conjugated lipomers and uses thereof
US11414393B2 (en) 2008-11-07 2022-08-16 Massachusetts Institute Of Technology Aminoalcohol lipidoids and uses thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2296331A (en) * 1938-05-03 1942-09-22 Gen Anilline & Film Corp Softener for halogen-containing high-molecular weight, organic compounds

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2296331A (en) * 1938-05-03 1942-09-22 Gen Anilline & Film Corp Softener for halogen-containing high-molecular weight, organic compounds

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104252A (en) * 1977-09-26 1978-08-01 Borg-Warner Corporation Olefin polymer stabilizer
US4563478A (en) * 1981-05-26 1986-01-07 Hepar Chimie S.A. Method of tranquilizing
US5300235A (en) * 1991-02-08 1994-04-05 Exxon Chemical Patents Inc. Corrosion inhibitors
US5427999A (en) * 1991-06-28 1995-06-27 Exxon Chemical Patents Inc. Amine adducts as corrosion inhibitors
WO1996038528A1 (en) * 1995-06-01 1996-12-05 The Procter & Gamble Company Betaine esters for delivery of alcohols
WO1997016407A1 (en) * 1995-11-02 1997-05-09 The Procter & Gamble Company Beta-amino ester compounds of perfume alcohols
JP3222143B2 (ja) 1995-11-02 2001-10-22 ザ、プロクター、エンド、ギャンブル、カンパニー 香料アルコールのβ−アミノエステル化合物
US11414393B2 (en) 2008-11-07 2022-08-16 Massachusetts Institute Of Technology Aminoalcohol lipidoids and uses thereof
US10933139B2 (en) 2011-03-28 2021-03-02 Massachusetts Institute Of Technology Conjugated lipomers and uses thereof
US12390528B2 (en) 2011-03-28 2025-08-19 Massachusetts Institute Of Technology Conjugated lipomers and uses thereof
JP2019182867A (ja) * 2011-10-27 2019-10-24 Massachusetts Institute Of Technology 薬物内包微小球の形成が可能なｎ−末端で官能基化されたアミノ酸誘導体

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