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Water-based resin compositon and articles made therefrom

a water-based resin and composition technology, applied in the field of new products, can solve the problems of limited performance of articles prepared from a conventional elastomer dispersion, the nature of components that may be used, and the use of a conventional water-based resin dispersion

Inactive Publication Date: 2011-07-21
ALLEGIANCE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0125]Advantages of the latex of the invention, process of making the latex, and articles manufactured from the latex include improved film forming (less surfactant / emulsifier compared to conventional composition), performance modification of gloves and other articles (protection of sensitive additives), and enhanced formulation properties (formulation stability and compatibility). In addition, the latex provides improved bulk properties of gloves and other articles (softness, barrier and oxidative degradation resistance), reduced surface contamination, e.g. cleaner glove (less impurity migration to surface), increased formulation efficiency (availability of additive without diffusion loss), improved maturation process (no diffusion process of ingredients / additives), and reduced manufacturing costs (less individual additive production).

Problems solved by technology

However, there are also several disadvantages to using a conventional water-based resin dispersion.
This obstacle also leads to a limitation on the nature of the components that may be used.
The second disadvantage is the limitations in the performance of the articles prepared from a conventional elastomer dispersion.
This causes the elastomer and the components to remain in their bulk states and inhibits their ability to diffuse and mix in a homogenous manner.
As a result, articles made from conventional elastomer dispersions have inferior properties.
The third disadvantage is the complexity of formulating conventional elastomer dispersions and a lack of flexibility in altering the formulations while attempting to improve the performance of articles made from the conventional elastomer dispersions.

Method used

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  • Water-based resin compositon and articles made therefrom
  • Water-based resin compositon and articles made therefrom

Examples

Experimental program
Comparison scheme
Effect test

example 1

Polyisoprene Latex with Additives Wingstay L, ZDEC and DPG

[0071]In this example, the additives Wingstay L, an antioxidant (obtained from Goodyear), and zinc diethyl dithiocarbamate (ZDEC) and diphenyl guanidine (DPG), vulcanization accelerators (both obtained from Flexsys), are first dissolved in solvents. The solutions are prepared by dissolving 0.4 g Wingstay L in 60 mL DCM, dissolving 0.2 g DPG in 10 mL DCM and dissolving 0.1 g ZDEC in 10 mL DCM and then adding these into 600 mL of pentane (obtained from Merck) in a 1 liter beaker.

[0072]20 g of polyisoprene rubber (Kraton IR) is cut into small pieces and slowly added into a beaker that is continuously stirred and contains the additive solution which includes 600 mL pentane and 80 mL DCM solvent that contains predissolved 2 phr Wingstay L, 1 phr DPG and 0.5 phr ZDEC. The concentration in Example 1 is about 2.9 weight polyisoprene / volume solvent. A higher concentration of about 6% weight / volume should be feasible.

[0073]The beaker i...

example 2

Polyisoprene Latex with Additives Wingstay L, ZDEC, DPG and MBT

[0081]A solution containing four additives is prepared by dissolving 0.44 g Wingstay L (obtained from Goodyear, 2 phr) in 60 mL DCM (obtained from Merck), dissolving 0.22 g DPG (obtained from Flexsys, 1 phr) in 20 mL DCM, dissolving 0.11 g ZDEC (obtained from Flexsys, 0.5 phr) in 20 mL DCM, dissolving 0.11 g MBT (obtained from Merck, 0.5 phr) in 50 mL acetone (obtained from Merck) and then adding the solutions one at a time to 600 mL pentane (obtained from Merck, solvent for polyisoprene) in a 1 liter beaker.

[0082]22 g of polyisoprene rubber (Kraton IR) is cut into small pieces and slowly added into the continuously stirred solvent mixture containing the four predissolved additives described above. The beaker is tightly covered with a piece of polyethylene sheet to minimize evaporation and the rubber / additives / pentane / DCM / acetone mixture is stirred until the rubber is completely dissolved. The temperature of the solvent ...

examples 3-5

And Control Polyisoprene Latex with Varying Amounts of Additives Wingstay L, ZDEC, DPG and ZMBT

[0090]In Examples 3-5, varying amounts of Wingstay L, ZDEC, and DPG, as shown in Table 3 below, are incorporated with polyisoprene latex into a single dispersion following the method described above in reference to FIG. 1. Example Control has the same formulation as Example 3, as shown in Table 3, but is not prepared according to the methods of the present invention. Instead, Example Control is prepared according to the method described in Example 1 of U.S. Pat. No. 6,828,387 (see col. 7, line 45 to col. 8, line 67). In U.S. Pat. No. 6,828,387, each of the accelerators was formulated into a separate dispersion and was added individually to a solution containing latex in water. In Example Control, accelerators ZDEC, DPG, and ZMBT and Wingstay L that were already in dispersion form were added to latex in an aqueous solution and were then mixed together.

[0091]The latex particle sizes for Exam...

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Abstract

An aqueous elastomer dispersion includes a dispersed phase and an aqueous phase. The dispersed phase includes an elastomer including curable aliphatic conjugated-diene elastomers, such as polyisoprene, and a minor amount of at least one additive. The aqueous phase includes water and other optional components in either a soluble state or a dispersion state. The aqueous elastomer dispersion may be prepared by dissolving an elastomer, such as rubber, and additives in a solvent mixture and then converting the resulting solution into an aqueous emulsion. The aqueous emulsion is concentrated and the solvent is stripped from it to yield a dilute latex. The dilute latex that is obtained is concentrated again. Articles made from the aqueous elastomer dispersion include medical gloves, condoms, probe covers, dental dams, finger cots, catheters and the like.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a novel water-based resin composition that includes an aqueous elastomer dispersion. Further, the invention relates to a method of preparing the aqueous elastomer dispersion and articles made from the aqueous elastomer dispersion which provide substantial improvements in performance when compared to those made from conventionally prepared water-based resin compositions.BACKGROUND OF THE INVENTION[0002]The use of water-based resin dispersions for making articles such as a film, coating, and adhesive provides several advantages when compared to its solvent-based counterpart. In particular, water-based dispersions are environmentally-friendly, easy to formulate, control temperature, and regulate pre-maturation, and have adjustable viscosities.[0003]However, there are also several disadvantages to using a conventional water-based resin dispersion. For example, there are limits on both the compounding of the dispersion and the ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L9/10
CPCC08C1/075C08J3/05C08J2309/00C08L9/10C08K5/0008C08J3/07C08L21/02
Inventor WANG, SHIPINGCHEN, SEONG F.BERGER, IDAYEH, YUN-SIUNG T.WONG, WEI C.
Owner ALLEGIANCE CORP
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