Structured acrylate copolymer for use in multi-phase systems

Abstract

Disclosed are multi-staged acrylic based core-shell polymers comprising a linear core polymer and at least one subsequently polymerized shell polymer. At least one of the subsequently polymerized shell polymers is crosslinked. The core-shell polymers surprisingly provide desirable rheological, clarity, and aesthetic properties in aqueous surfactant containing compositions, particularly at low pH. The multi-staged acrylic base core-shell polymers can be included in at least one phase of a multi-phase personal care, home care, health care, and institutional and industrial care composition to impart phase stability thereto.

Description

technical field

[0001] In one aspect, the present invention is directed to acrylic-based graded core-shell polymers comprising a linear core and at least one cross-linked shell. In another aspect, the present invention relates to acrylic-based graded core-shell polymer thickeners suitable for use in aqueous systems. A further aspect of the present invention relates to forming a stable, aqueous composition comprising an acrylic-based staged core-shell polymer rheology modifier, a surfactant, and optionally various components, the optional various Components are substantially insoluble materials that require suspension or stabilization. In addition, a further aspect of the present invention relates to the formation of clear, rheologically and phase stable surfactant compositions formulated in the low pH range for multi-phase systems. Background of the invention

[0002] Rheology modifiers, also known as thickeners or viscosity builders, are ubiquitous in personal care cleans...

Examples

Embodiment 1

[0402] Embodiment 1 (two-stage polymer)

[0403] To a first (feed) reactor equipped with a stirrer containing 68.6 grams of deionized water (D.I.) and 6.67 grams of sodium lauryl sulfate (30% active ingredient in water wt / wt), 130.4 grams of ethyl acrylate and 69 grams of methacrylic acid and mixed at 500 rpm to form a monomer emulsion. To a second reactor equipped with a stirrer was added 1,340 grams of deionized water and 3.17 grams of sodium lauryl sulfate (30% active ingredient wt / wt in water). The contents of the second reactor were heated under a nitrogen atmosphere with mixing and stirring (200 rpm). When the contents of the second reactor reached a temperature of approximately 84°C, 27.0 grams of ammonium persulfate solution (2.0% aqueous solution wt / wt) was injected into the heated surfactant solution. The monomer emulsion from the feed reactor was gradually metered (9.37 g / min.) into the second reactor over a period of about 30 minutes at a reaction temperature mai...

Embodiment 2

[0405] Into a first (feed) reactor equipped with a stirrer containing 68.6 grams of deionized water (D.I.) and 6.67 grams of sodium lauryl sulfate (30% active ingredient in water wt / wt), 5.0 grams of Ethal SA20, in 130.4 grams of ethyl acrylate and 69 grams of methacrylic acid were added under a nitrogen atmosphere and mixed at 500 rpm to form a monomer emulsion. To a second reactor equipped with a stirrer was added 1340 grams of deionized water and 3.17 grams of sodium lauryl sulfate (30% active ingredient in water wt / wt). The contents of the second reactor were heated (200 rpm) under a nitrogen atmosphere with mixing and stirring. When the contents of the second reactor reached a temperature of approximately 84°C, 27.0 grams of ammonium persulfate solution (2.0% aqueous solution wt / wt) was injected into the heated surfactant solution. The monomer emulsion from the feed reactor was gradually metered into the second reactor over 30 minutes at a feed rate of 1.87 g / min at a re...

Embodiment C-1

[0407] Embodiment C-1 (comparison)

[0408]An acrylic-based emulsion polymer with a crosslinked core and a linear shell, designated Polymer C-1, was polymerized from the components given in Table 1 . The emulsion polymerization procedure given in Example 2 was followed except that the crosslinked core polymer was synthesized in a first stage reaction followed by the synthesis of the linear polymer shell. In this example, 10% of the monomer emulsion prepared in the feed reactor given in Example 2 was metered over a period of 6 minutes at a temperature maintained at 85 °C and at a feed rate of 24 ml / min. Add to the second reactor. Then 3.0 grams of crosslinking monomer (TMPTA) was added to the second reactor and mixed for 10 minutes to obtain a homogeneous monomer emulsion. 27.0 grams of ammonium persulfate (2.0% aqueous solution wt / wt) was injected into the reactor with stirring and polymerized to form cross-linked core particles. After standing for 10 minutes, the second co...

technical field

[0001] In one aspect, the present invention is directed to acrylic-based graded core-shell polymers comprising a linear core and at least one cross-linked shell. In another aspect, the present invention relates to acrylic-based graded core-shell polymer thickeners suitable for use in aqueous systems. A further aspect of the present invention relates to forming a stable, aqueous composition comprising an acrylic-based staged core-shell polymer rheology modifier, a surfactant, and optionally various components, the optional various Components are substantially insoluble materials that require suspension or stabilization. In addition, a further aspect of the present invention relates to the formation of clear, rheologically and phase stable surfactant compositions formulated in the low pH range for multi-phase systems. Background of the invention

[0002] Rheology modifiers, also known as thickeners or viscosity builders, are ubiquitous in personal care cleans...

Examples

Embodiment 1

[0402] Embodiment 1 (two-stage polymer)

[0403] To a first (feed) reactor equipped with a stirrer containing 68.6 grams of deionized water (D.I.) and 6.67 grams of sodium lauryl sulfate (30% active ingredient in water wt / wt), 130.4 grams of ethyl acrylate and 69 grams of methacrylic acid and mixed at 500 rpm to form a monomer emulsion. To a second reactor equipped with a stirrer was added 1,340 grams of deionized water and 3.17 grams of sodium lauryl sulfate (30% active ingredient wt / wt in water). The contents of the second reactor were heated under a nitrogen atmosphere with mixing and stirring (200 rpm). When the contents of the second reactor reached a temperature of approximately 84°C, 27.0 grams of ammonium persulfate solution (2.0% aqueous solution wt / wt) was injected into the heated surfactant solution. The monomer emulsion from the feed reactor was gradually metered (9.37 g / min.) into the second reactor over a period of about 30 minutes at a reaction temperature mai...

Embodiment 2

[0405] Into a first (feed) reactor equipped with a stirrer containing 68.6 grams of deionized water (D.I.) and 6.67 grams of sodium lauryl sulfate (30% active ingredient in water wt / wt), 5.0 grams of Ethal SA20, in 130.4 grams of ethyl acrylate and 69 grams of methacrylic acid were added under a nitrogen atmosphere and mixed at 500 rpm to form a monomer emulsion. To a second reactor equipped with a stirrer was added 1340 grams of deionized water and 3.17 grams of sodium lauryl sulfate (30% active ingredient in water wt / wt). The contents of the second reactor were heated (200 rpm) under a nitrogen atmosphere with mixing and stirring. When the contents of the second reactor reached a temperature of approximately 84°C, 27.0 grams of ammonium persulfate solution (2.0% aqueous solution wt / wt) was injected into the heated surfactant solution. The monomer emulsion from the feed reactor was gradually metered into the second reactor over 30 minutes at a feed rate of 1.87 g / min at a re...

Embodiment C-1

[0407] Embodiment C-1 (comparison)

[0408]An acrylic-based emulsion polymer with a crosslinked core and a linear shell, designated Polymer C-1, was polymerized from the components given in Table 1 . The emulsion polymerization procedure given in Example 2 was followed except that the crosslinked core polymer was synthesized in a first stage reaction followed by the synthesis of the linear polymer shell. In this example, 10% of the monomer emulsion prepared in the feed reactor given in Example 2 was metered over a period of 6 minutes at a temperature maintained at 85 °C and at a feed rate of 24 ml / min. Add to the second reactor. Then 3.0 grams of crosslinking monomer (TMPTA) was added to the second reactor and mixed for 10 minutes to obtain a homogeneous monomer emulsion. 27.0 grams of ammonium persulfate (2.0% aqueous solution wt / wt) was injected into the reactor with stirring and polymerized to form cross-linked core particles. After standing for 10 minutes, the second co...

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