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US 9,068,148 B2Granted
Blends of acrylic copolymer thickeners
AssigneeLubrizol Advanced Materials, Inc.
InventorsKrishnan Tamareselvy, Denise W. Rafferty
Life of this patent
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Abstract
Disclosed are blends of acrylic polymers comprising at least one crosslinked acrylic copolymer and at least one linear acrylic copolymer. The acrylic polymer blends surprisingly provide desirable rheological, clarity, and aesthetic properties in aqueous surfactant containing compositions, particularly at low pH.
Claims37
An acrylic polymer blend comprising from about 20% to about 95% by weight of at least one crosslinked acrylic copolymer and from about 80% to about 5% by weight of at least one acrylic linear, non-crosslinked polymer, based on the total weight of active polymer solids in the blend, wherein
- I) said linear polymer is polymerized from a monomer selected from:
- a) from about 10% to about 90% by weight of at least one carboxylic acid monomer comprising acrylic acid, methacrylic acid, itaconic acid, fumaric acid, crotonic acid, aconitic acid, or maleic acid, or combinations thereof;
- b) from about 90% to about 20% by weight of at least one C1 to C5 alkyl ester and/or at least one C1 to C5 hydroxyalkyl ester of acrylic acid or methacrylic acid;
- and optionally
- c) from about 1% to about 35% by weight of at least one α,β-ethylenically unsaturated monomer selected from a monomer represented by the formulas:
- CH2═C(R)C(O)OR1, i)
- wherein R is selected from hydrogen or methyl;
- and R1 is selected from C6-C10 alkyl, C6 to C10 hydroxyalkyl, —(CH2)2OCH2CH3, and —(CH2)2C(O)OH and salts thereof;
- CH2═C(R)X, ii)
- wherein R is hydrogen or methyl;
- and X is selected from —C6H5, —CN, —C(O)NH2, —NC4H6O, —C(O)NHC(CH3)3, —C(O)N(CH3)2, C(O)NHC(CH3)2(CH2)4CH3, and —C(O)NHC(CH3)2CH2S(O)(O)OH and salts thereof;
- CH2═CHOC(O)R1, iii)
- wherein R1 is linear or branched C1-C18 alkyl;
- and
- CH2═C(R)C(O)OAOR2, iv)
- wherein A is a divalent radical selected from —CH2CH(OH)CH2— and —CH2CH(CH2OH)—, R is selected from hydrogen or methyl, and R2 is an acyl residue of a linear or branched, saturated or unsaturated C10 to C22 fatty acid;
- and wherein
- II) said crosslinked polymer is polymerized from a monomer selected from;
- a1) from about 20% to about 80% by weight of at least one carboxylic acid monomer comprising acrylic acid, methacrylic acid, itaconic acid, fumaric acid, crotonic acid, aconitic acid, or maleic acid, or combinations thereof;
- b1) from about 80% to about 15% by weight of at least one C1 to C5 alkyl ester and/or at least one C1 to C5 hydroxyalkyl ester of acrylic acid or methacrylic acid;
- c1) from about 0.01% to about 5% by weight of at least one crosslinking monomer;
- and optionally
- d1) from about 1% to about 35% by weight of at least one α,β-ethylenically unsaturated monomer selected from formulas i) to iv) above.
20 more elements
A method for making an acrylic based polymer blend, said method comprising:
- I) polymerizing a monomer composition in the absence of a crosslinking monomer to obtain a linear, non-crosslinked polymer, said monomer composition comprising:
- a) from about 10% to about 90% by weight of at least one carboxylic acid monomer comprising acrylic acid, methacrylic acid, itaconic acid, fumaric acid, crotonic acid, aconitic acid, or maleic acid, and salts thereof, and combinations thereof;
- b) from about 90% to about 20% by weight of at least one C1 to C5 alkyl ester and/or at least one C1 to C5 hydroxyalkyl ester of acrylic acid or methacrylic acid;
- and optionally
- c) from about 1% to about 35% by weight of at least one α,β-ethylenically unsaturated monomer selected from a monomer represented by the formulas:
- CH2═C(R)C(O)OR1, i)
- wherein R is selected from hydrogen or methyl;
- and R1 is selected from C6-C10 alkyl, C6 to C10 hydroxyalkyl, —(CH2)2OCH2CH3, and —(CH2)2C(O)OH and salts thereof;
- CH2═C(R)X, ii)
- wherein R is hydrogen or methyl;
- and X is selected from —C6H5, —CN, —C(O)NH2, —NC4H6O, —C(O)NHC(CH3)3, —C(O)N(CH3)2, —C(O)NHC(CH3)2(CH2)4CH3, and —C(O)NHC(CH3)2CH2S(O)(O)OH and salts thereof;
- CH2═CHOC(O)R1, iii)
- wherein R1 is linear or branched C1-C18 alkyl;
- and
- CH2═C(R)C(O)OAOR2, iv)
- wherein A is a divalent radical selected from —CH2CH(OH)CH2— and —CH2CH(CH2OH)—, R is selected from hydrogen or methyl, and R2 is an acyl residue of a linear or branched, saturated or unsaturated C10 to C22 fatty acid;
- II) polymerizing a monomer composition in the presence of a crosslinking monomer to obtain a crosslinked polymer, said monomer composition comprising:
- a1) from about 20% to about 80% by weight of at least one carboxylic acid monomer comprising acrylic acid, methacrylic acid, itaconic acid, fumaric acid, crotonic acid, aconitic acid, or maleic acid, and salts thereof, and combinations thereof;
- b1) from about 80% to about 15% by weight of at least one C1 to C5 alkyl ester and/or at least one C1 to C5 hydroxyalkyl ester of acrylic acid or methacrylic acid;
- c1) from about 0.01% to about 5% by weight of at least one crosslinking monomer;
- and optionally
- d1) from about 1% to about 35% by weight of at least one α,β-ethylenically unsaturated monomer selected from formulas i) to iv) above;
- and
- III) blending said acrylic polymers prepared in steps I) and II) in a blend ratio ranging from about 20% to about 95% by weight of at least one crosslinked acrylic copolymer and from about 80% to about 5% by weight of at least one acrylic linear polymer, based on the total weight of active polymer solids in the blend.
21 more elements
A method for thickening an aqueous composition comprising a acrylic polymer blend comprising:
- adding to said aqueous composition a pH adjusting agent selected from an acidic material, an alkaline material, and mixtures thereof, wherein said acrylic polymer blend comprises from about 20% to about 95% by weight of at least one crosslinked acrylic copolymer and from about 80% to about 5% by weight of at least one acrylic linear, non-crosslinked polymer, based on the total weight of active polymer solids in the blend, wherein
- I) said linear polymer is polymerized from a monomer selected from:
- a) from about 10% to about 90% by weight of at least one carboxylic acid monomer comprising acrylic acid, methacrylic acid, itaconic acid, fumaric acid, crotonic acid, aconitic acid, or maleic acid, and salts thereof, and combinations thereof;
- b) from about 90% to about 20% by weight of at least one C1 to C5 alkyl ester and/or at least one C1 to C5 hydroxyalkyl ester of acrylic acid or methacrylic acid;
- and optionally
- c) from about 1% to about 35% by weight of at least one α,β-ethylenically unsaturated monomer selected from a monomer represented by the formulas:
- CH2═C(R)C(O)OR1, i)
- wherein R is selected from hydrogen or methyl;
- and R1 is selected from C6-C10 alkyl, C6 to C10 hydroxyalkyl, —(CH2)2OCH2CH3, and —(CH2)2C(O)OH and salts thereof;
- CH2═C(R)X, ii)
- wherein R is hydrogen or methyl;
- and X is selected from —C6H5, —CN, —C(O)NH2, —NC4H6O, —C(O)NHC(CH3)3, —C(O)N(CH3)2, —C(O)NHC(CH3)2(CH2)4CH3, and —C(O)NHC(CH3)2CH2S(O)(O)OH and salts thereof;
- CH2═CHOC(O)R1, iii)
- wherein R1 is linear or branched C1-C18 alkyl;
- and
- CH2═C(R)C(O)OAOR2, iv)
- wherein A is a divalent radical selected from —CH2CH(OH)CH2— and —CH2CH(CH2OH)—, R is selected from hydrogen or methyl, and R2 is an acyl residue of a linear or branched, saturated or unsaturated C10 to C22 fatty acid;
- and wherein
- II) said crosslinked polymer is polymerized from a monomer selected from;
- a1) from about 10% to about 80% by weight of at least one carboxylic acid monomer comprising acrylic acid, methacrylic acid, itaconic acid, fumaric acid, crotonic acid, aconitic acid, maleic acid, and salts thereof, and combinations thereof;
- b1) from about 90% to about 15% by weight of at least one C1 to C5 alkyl ester and/or at least one C1 to C5 hydroxyalkyl ester of acrylic acid or methacrylic acid;
- c1) from about 0.01% to about 5% by weight of at least one crosslinking monomer;
- and optionally
- d1) from about 1% to about 35% by weight of at least one α,β-ethylenically unsaturated monomer selected from formulas i) to iv) above.
21 more elements
Dependencies are inferred from the claim text.