High temperature resistant polychloroprene adhesive resin

Abstract

Superior polychloroprene adehsives are prepared by incorporating the reaction product of an alkali catalyzed alkyl phenol-formaldehyde resin and zinc resinate. Preferably an arylphenol and/or bisphenol A is also incorporated. Also preferably rosin is included in the composition. Other zinc compounds, e.g. zinc oxide, zinc borate, zinc phosphate, zinc carbonate, and zinc salicylate can be used in place of zinc resinate.

We claim:  .[.1. An adhesive composition comprising a polymer of chloroprene and the heat reaction product of zinc resinate and an alkaline condensed alkyl or aryl substituted phenolformaldehyde resin..].  .[.2. An adhesive composition according to claim 1 wherein the phenol is para alkyl substituted phenol..]. .[.3. An adhesive composition according to claim 2 wherein the alkyl group has 3 to 6 carbon atoms..]. .[.4. An adhesive composition according to claim 1 comprising 100 parts of the chloroprene polymer and 5 to 200 parts of the zinc resinate reacted phenol formaldehyde resin..]. .[.5. An adhesive composition according to claim 4 wherein the phenol formaldehyde resin contains at least 0.7 mole of formaldehyde per mole of phenol and the zinc resinate is used in an amount of 5 to 35% based on the final resin..]. .[.6. An adhesive composition according to claim 5 wherein the phenol formaldehyde resin is a para alkylphenol formaldehyde resin having a part of the alkylphenol replaced by a member of the group consisting of arylphenols, chlorophenol and 2,2-bis-4'-hydroxyphenol) propane wherein the heat reaction in preparing the zinc resinate-phenol formaldehyde product was terminated at a temperature between 150° C. and 250° C..]. .[.7. An adhesive composition according to claim 6 including rosin..]. .[.8. An adhesive composition according to claim 5 wherein the phenol formaldehyde resin contains at least 0.3 mole of formaldehyde per mole of phenol and the zinc resinate is used in an amount of 5 to 75% based on the final resin..]. .[.9. An adhesive composition according to claim 8 wherein the phenol formaldehyde resin is a p-alkylphenol formaldehyde resin having 2 to 70% of the alkylphenol replaced by a member of the group consisting of arylphenols, chlorophenol and 2,2-bis-(4'-hydroxyphenyl) propane and wherein the heat reaction in preparing the zinc resinate-phenol formaldehyde product was terminated at a temperature between 150° C. and 300° C..]. .[.10. An adhesive composition according to claim 9 including rosin..]. .[.11. An adhesive composition comprising a polymer of chloroprene and the heat reaction product of a zinc compound selected from the group consisting of zinc resinate, zinc oxide, zinc carbonate, zinc borate, zinc salicylate and zinc phosphate, and an alkaline condensate alkyl or aryl substituted phenol-formaldehyde resin..]. .[.12. An adhesive composition according to claim 11 wherein the zinc compound is 
     
        a zinc compound other than zinc resinate..]. 13. An adhesive composition according to claim .[.11.]. .Iadd.20 .Iaddend.wherein the zinc compound is selected from the group consisting of .[.zinc oxide,.]. zinc borate, zinc 
     
     
        phosphate, zinc salicylate and basic zinc carbonate. 14. An adhesive composition according to claim .[.11.]. .Iadd.20 .Iaddend.wherein the 
     
     
        phenol is a para alkyl phenol. 15. An adhesive composition according to 
     
     
        claim 14 wherein the alkyl group has 3 to 6 carbon atoms. 16. An adhesive composition according to claim .[.11.]. .Iadd.20 .Iaddend.comprising 100 parts of the chloroprene polymer and 5 to 200 parts of the zinc compound 
     
     
        reacted phenol-formaldehyde resin. 17. An adhesive composition according to claim 16 wherein .[.the phenol formaldehyde resin contains at least 0.3 mole of formaldehyde per mole of phenol and.]. the zinc compound is used in an amount of .[.0.5.]. .Iadd.5 .Iaddend.to 75% based on the final 
     
     
        resin. 18. An adhesive composition according to claim 17 wherein the zinc compound is selected from the group consisting of .[.zinc oxide,.]. zinc 
     
     
        borate, zinc phosphate, zinc salicylate and zinc carbonate. 19. A composition according to claim 18 including rosin in an amount of 20 to 
     
     
        45% of the phenols employed. .Iadd. 20.  An adhesive composition comprising a polymer of chloroprene and the thermoplastic heat reaction product of a zinc compound selected from the group consisting of zinc carbonate, zinc borate, basic zinc carbonate, zinc salicylate and zinc phosphate, and an alkaline condensed alkyl or aryl substituted phenol-formaldehyde resin made by condensing formaldehyde and the phenol in a molar ratio of from 0.395:1 to 1.29:1. .Iaddend. .Iadd. 21. An adhesive composition according to claim 20 wherein the zinc compound is selected from the group consisting of zinc carbonate, zinc borate, zinc salicylate and zinc phosphate. .Iaddend..Iadd. 22. an adhesive composition according to claim 21 wherein the zinc compound is zinc carbonate. .Iaddend..Iadd. 23. An adhesive composition according to claim 21 wherein the zinc compound is zinc borate. .Iaddend..Iadd. 24. An adhesive composition according to claim 21 wherein the zinc compound is zinc salicylate. .Iaddend. .Iadd. 25. An adhesive composition according to claim 21 wherein the zinc compound is zinc phosphate. .Iaddend.