Aqueous reinforced rubber dispersions and their use for making latex foams

a technology of reinforced rubber and aqueous styrene, which is applied in the field of new aqueous styrene reinforced rubber dispersions, can solve the problems of high resilience of latex foam, unsuitable for all applications of latex foam, and inability to achieve multiphase graft copolymer dispersions, etc., and achieve the effect of stabilizing the foam structur

Active Publication Date: 2006-10-26
POLYMERLATEX GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this invention relates to improving stability during production by creating stable bubbles that help prevent air from escaping when producing froth or ice creams with good quality.

Problems solved by technology

Technological Problem: Existing methods such as emulsion aggregations (ECA) require long mixing times due to their slow reaction kineansque action under pressure. These techniques result in decreased gel formation efficiency leading to reduced production rates when compared to regular EVA systems. Additionally, existing processes involve multiple steps involving different materials and solvents, making them difficult to control accurately.

Method used

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  • Aqueous reinforced rubber dispersions and their use for making latex foams

Examples

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reference example 1

Reinforcing Latex having a Ratio of Structural Units of Styrene to 1,3-butadien of 80 / 20

[0083] The reactor is charged with a solution of 1.75 g potassium oleate, 2.8 g sodium hydroxide and 0.350 g ammonium persulfate in 1225.0 g deionized water. The reactor is purged with nitrogen three times. The mixture is heated to 75 C and the temperature is kept constant. Then a feeding of 0.42 g ammonium persulfate dissolved in 7.98 g deionized water is started. The amount of the solution added per unit time is 0.420 g / min. The starting point of this feed is the time 0 minutes. At time 5 minutes the feed of 2 further components is started simultaneously. The first component consists of 26.950 g butadiene. The feeding rate is 1.797 g / min. The second component consists of 0.385 g tertiary-dodecyl mercaptan in 107.8 g styrene. The feeding rate is 7.212 g / min. At time 20 minutes the feeding of ammonium persulfate, butadiene and styrene is stopped. The inner reactor temperature is heated to 8

reference example 2

Reinforcing Latex having a Ratio of Structural Units of Styrene to 1,3-butadien of 70 / 30

[0087] The reactor is charged with a solution of 4.2 g potassium oleate, 10.5 g sodium hydroxide and 0.735 g ammonium persulfate in. 1925.0 g deionized water. The reactor is purged with nitrogen three times. The mixture is heated to 75° C. and the temperature is kept constant. Then a feeding of 0.875 g ammonium persulfate dissolved in 16.625 g deionized water is started. The amount of the solution added per unit time is 0.875 g / min. The starting point of this feed is the time 0 minutes. At time 5 minutes the feed of 2 further components is started simultaneously. The first component consists of 40.390 g butadiene. The feeding rate is 2.693 g / min. The second component consists of 94.220 g styrene. The feeding rate is 6.281 g / min. At time 20 minutes the feeding of ammonium persulfate, butadiene and styrene is stopped. The inner reactor temperature is heated to 81° C. within 15 minutes and the

reference example 3

Reinforcing Latex having a Ratio of Structural Units of Styrene to 1,3-butadien of 65 / 35

[0092] The reactor is charged with a solution of 4.2 g potassium oleate, 10.5 g sodium hydroxide and 0.735 g ammonium persulfate in 1925.0 g deionised water. The reactor is purged with nitrogen three times. The mixture is heated to 75° C. and the temperature is kept constant. Then a feeding of 0.875 g ammonium persulfate dissolved in 16.625 g deionised water is started. The amount of the solution added per unit time is 0.875 g / min. The starting point of this feed is the time 0 minutes. At time 5 minutes the feed of 2 further components is started simultaneously. The first component consists of 47.11 g butadiene. The feeding rate is 3.141 g / min. The second component consists of 87.5 g styrene. The feeding rate is 5.833 g / min. At time 20 minutes the feeding of ammonium persulfate, butadiene and styrene is stopped. The inner reactor temperature is heated to 81° C. within 15 minutes and then ke

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Abstract

The present invention relates to an aqueous reinforced rubber dispersion comprising: a) 51 to 90 wt-% of base latex polymer particles; and b) 10 to 49 wt-% of reinforcing latex polymer particles comprising structural units of aromatic vinyl monomers and conjugated diene monomers, the reinforcing latex polymer particles having a single glass transition temperature (Tg) from −25° C. to 28° C. as measured by differential scanning calorimetry (DSC), whereby the weight percentages are based on the total weight of polymer particles in the rubber dispersion and the base latex polymer particles have a Tg as measured by DSC that is lower than the Tg of the reinforcing latex particles, to the use of the rubber dispersion for making latex foam, to a method for making latex foam and to an article comprising the latex foam obtained from the rubber dispersion of the present invention.

Description

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Claims

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Application Information

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Owner POLYMERLATEX GMBH & CO KG
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