Alkali-swellable crosslinked acrylate copolymer, methods of manufacture thereof, and composition comprising the same
A technology of polyacrylate and copolymer, which is applied in skin care preparations, medical preparations containing active ingredients, pharmaceutical formulations, etc., and can solve the problems of expensive, economical and undesired associative thickeners
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[0053] Rheological analysis
[0054] Samples were centrifuged at 3,000 revolutions per minute (rpm) for 10 minutes (min) prior to rheological analysis. The dynamic oscillatory response and flow rheological curves were collected using an AR-2000 rheometer (TA Instruments Inc.) using a 60 millimeter (mm) diameter stainless steel cone with a 0.5° angle and a Peltier plate, run at 25°C.
[0055] Dynamic oscillatory rheology: with 5 per second (s -1 ) for an initial shear condition of the sample for 5 minutes (min), followed by a 2-minute hold. The frequency was held constant at 1 Hertz (Hz) and the stress was increased from 0.05 to 1000 Pascals (Pa) with 10 data points per decade of frequency (logarithmic distribution). Use the RheologyAdvantageDataAnalysis program (TAInstruments Company) to calculate the point where the elastic modulus is equal to the storage modulus (G'=G"), and record the yield stress (YS, x-axis value) at the intersection point and the G' value at the inter...
example 1
[0064] A three-liter round bottom flask equipped with a mechanical stirrer, heating mantle, thermocouple, condenser, and inlet tubes for addition of monomer, initiator, and nitrogen was charged with 489 grams (g) of deionized water. The water was stirred and heated to 92-94°C with a stream of nitrogen. 32.13 g of 28% sodium lauryl sulfate (SLS) and 721 g of deionized water were added to a plastic lined container and mixed by overhead agitation. A vessel was charged with ethyl acrylate (EA, 302.35 g), followed by 27 g ethylhexyl acrylate (EHA), 16.19 g vinyl neodecanoate (VEOVA), 0.77 g trimethylolpropane diallyl ether ( 90% activated, TMPDE-90) and 194.36 g methacrylic acid (MAA) to create a smooth. Stable monomer emulsion. An initiator pack was prepared by dissolving 0.197 g ammonium persulfate (APS) in 12 g deionized water and placed. An initiator solution of 0.9 g APS dissolved in 63.8 g deionized water was added to the syringe.
[0065] When the contents of the flask r...
example 2
[0073] Example 1 was repeated with the difference that the monomer emulsion and the HEC grafting solution were different. 32.13 g of 28% SLS and 721 g of deionized water were added to a plastic lined container and mixed by overhead agitation. 77.14 g of a surfactant monomer mixture comprising methacrylate of 20-ethoxylate of cetyl-stearyl alcohol (70% by weight), MAA (20% by weight) and 10% by weight of deionized water (hereinafter referred to as "MA-20") and 248.4 g of EA were charged into a container, followed by the slow addition of 27 g of EHA, 16.19 g of VEOVA, 0.69 g of TMPDE-90, and 179.08 g of MAA to form a smooth, stable monomer emulsion.
[0074] A polysaccharide grafting solution was prepared by adding 3 g of HECQP-3L to 160 g of deionized water, followed by 3 g of 28% sodium lauryl sulfate, and stirring by overhead mixing. MA-20 (8.57g), EA (27.6g) were charged into a container, followed by 3g EHA, 1.8g VEOVA, 19.88g MAA and 0.062g TMPDE-90 to form a smooth, stabl...
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