Polychloroprene adhesive latex composition

Inactive Publication Date: 2000-03-14
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is directed to an aqueous latex adhesive composition which ex

Problems solved by technology

A disadvantage of the use of highly crystalline chloroprene homopolymers, however, is that cements containing them are susceptible to bond failure at temperatures of, for example, 80.degree. C.-95.degree. C., unless a second curing step is employed.
Despite this enhanced thermal resistance, merely substituting chloroprene copolymers for chloroprene homopolymers is not an acceptable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example

EXAMPLE 1

An aqueous emulsion was prepared by emulsifying 100 parts chloroprene, 0.07 parts of dodecylmercaptan, .Iadd.(3.1.times.10.sup.-4 moles per mole of chloroprene), .Iaddend.2.5 parts of disproportionated abietic acid, 0.9 parts of the potassium salt of a napthalensulfonic acid formaldehyde condensate, 0.15 parts dimer acid stabilized with 0.0001 part of p-tert-butylcatechol, and 80 parts water. Polymerization was carried out under nitrogen at 9.degree. C. in the presence of a redox / free radical initiator system consisting of 0.1 part dextrose, 0.2 parts sodium formaldehyde sulfoxylate, 0.2 parts trisodium phosphate, 0.1 part potassium sulfite, and 0.001 parts sodium 2-anthraquinonesulfonate. A 5% solution of potassium persulfate was added dropwise until a conversion of 85% was attained. The polymerization was stopped by addition of 0.04 parts phenothiazine and the aqueous dispersion was stabilized with 0.44 parts of the sodium salt of disproportionated abietic acid. Unpolymer...

Example

EXAMPLE 2

A chloroprene homopolymer latex was prepared substantially as described in Example 1, using the same reaction conditions, reaction temperature, and amounts of reactants, catalysts and other ingredients except that 0.12 parts of diisopropylxanthogen disulfide per 100 parts of chloroprene .Iadd.(3.9.times.10.sup.-4 moles per mole of chloroprene) .Iaddend.was added as a chain transfer agent in place of dodeCylmercaptan. After removal of unreacted monomer, the resultant latex had a gel content of 12.2%. An adhesive latex was then prepared by mixing the components shown in Table I with the chloroprene homopolymer latex. The proportions in Table I are stated in amounts of additive per 100 parts of polychloroprene.

Control Example A

A chloroprene homopolymer latex was prepared substantially as described in Example 1 using the same conditions and amounts of reactants, catalysts, and other ingredients except that the polymerization took place at a temperature of 14.degree. C. and the ...

Example

Control Example B

A chloroprene homopolymer latex was prepared substantially as described in Example 1 using the same conditions and amounts of reactants, catalysts, and other ingredients except that the polymerization took place at a temperature of 9.degree. C. and 0.11 parts of dodecylmercaptan per 100 parts chloroprene monomer .Iadd.(4.8.times.10.sup.-4 moles per mole of chloroprene) .Iaddend.was used in place of 0.07 part dodecylmercaptan. The gel content of the resultant latex after removal of unreacted monomer was 1.1%. An adhesive latex was then prepared by mixing the components shown in Table I with the chloroprene homopolymer latex. The proportions in Table I are stated in amounts of additive per 100 parts of polychloroprene. Properties of adhesive bonds prepared using the adhesive latex are shown in Table I.

TABLE I ______________________________________ Control Control Adhesive Formulation Ex. 1 Ex. 2 Ex. A Ex. B ______________________________________ Chloroprene 100 100 10...

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Abstract

Polychloroprene latex adhesive compositions which comprise a) mercaptan-modified or xanthogen disulfide-modified 2-chloro-1,3-butadiene homopolymers having gel contents of 5-[70]78.7 percent by weight, b) 1 to 75 parts by weight of rosin per 100 parts by weight of a), and c) sufficient water to provide a solids content of 25-65 weight percent based on the weight of component a) exhibit excellent heat resistance and green bond strength.

Description

BACKGROUND OF THE INVENTIONThis invention relates to polychloroprene latex adhesive compositions. More specifically, this invention relates to polychloroprene adhesive compositions which are particularly suited to bonding foamed polymeric materials such as polyurethanes and polyolefins to substrates including bonded fibre board, thermoplastic olefins, fabric, and polyurethanes.Polymers of chloroprene (i.e. 2-chloro-1,3-butadiene) are well known, commercially available elastomers useful in the manufacture of general rubber goods, adhesives, and coating compositions. They are especially suited for formulation of contact adhesives, which are generally sold in the form of cements, i.e. solutions of polymers and additives in organic solvents. Most commonly, the polychloroprenes used as elastomeric components in these cements are chloroprene homopolymers having relatively high levels of crystallinity. Such polymers promote rapid adhesive bond strength development, i.e. green bond strength...

Claims

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Application Information

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IPC IPC(8): C08F136/18C08F136/00C09J193/00C09J193/04C09J111/00C09J111/02C08L93/04
CPCC08F136/18C08L93/04C09J111/02C09J193/04C08L2666/08C08L2666/26
Inventor CHRISTELL, LANCE ALANTABIBIAN, RICHARD MISAK
Owner EI DU PONT DE NEMOURS & CO
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