Preparation of polychloroprene for use in adhesives

Claim 2

PROCESS FOR THE PRODUCTION OF POLYCHLOROPRENE RUBBER IN AN AQUEOUS EMULSION, COMPRISING POLYMERIZING CHLOROPRENE IN THE PRESENCE OF AN EMULSIFYING SYSTEM, THE WEIGHT COMPOSITION OF WHICH WITH REGARD TO CHLOROPRENE IS 1.8 TO 3% OF RESINIC ACID OR SALT SELECTED FROM THE GROUP CONSISTING OF NON-MODIFIED ROSIN, DISPROPORTIONED ROSIN, HYDROGENATED ROSIN AND THEIR ALKALINE SOAPS AND 0.1 TO 1% OF SATURATED OR UNSATURATED FATTY ACID SELECTED FROM THE GROUP CONSISTING OF LAURIC ACID, MYRISTIC ACID, STEARIC ACID, OLEIC ACID, PALMITIC ACID, AND SYNTHETIC FATTY ACID, AN ALKALINE SALT OF SAID FATTY ACID, A MIXTURE OF SAID FATTY ACIDS, MIXTURES OF SAID ALKALINE SALTS, OR MIXTURES OF SAID FATTY ACIDS AND ALKALINE SALTS.

Claim 3

Process according to claim 1 comprising adding a sticking agent in an amount effective to give chloroprene rubber improved adhesive properties.

Claim 4

Process according to claim 2 wherein said chloroprene polymerization is carried out in the presence of a ternary system, the weight composition of which with regard to chloroprene is 1 to 3% of said resinic acid or salt, 0.1 to 1.5% of said fatty acid or alkaline salt thereof and 0.1 to 2% of said sticking agent.

Claim 5

Process according to claim 2 wherein said sticking agent is a rosin ester.

Claim 6

Process according to claim 4 in which chloroprene polymerization is carried out in the presence of a system, weight composition of which with regard to chloroprene is 1 to 3% of said resinic acid or salt, 0.1 to 1.5% of said fatty acids or alkaline salts thereof and 1 to 2% of said rosin ester.

Claim 7

Process according to claim 2 wherein said sticking agent is a polydiene resin from petroleum.

Claim 8

Process according to claim 6 wherein the chloroprene polymerization is made in the presence of a system, the weight composition of which with regard to chloroprene is 1.8 to 3% of said resinic acid or salt, 0.1 to 1.5% of said saturated or unsaturated fatty acid or alkaline salt thereof and 0.1 to 2% of said polydiene resin from petroleum.

Claim 9

Polychloroprene rubber obtained by a process according to claim 2.

Claim 10

An adhesive composition comprising the polychloroprene rubber of claim 8, magnesium oxide, zinc oxide, phenolic resin and solvent, said composition maintaining a single phase.

Claim 11

Polychloroprene rubber obtained by a process according to claim 1.

Claim 12

A process for the production of an adhesive composition which is not subject to phase separation comprising: polymerizing chloroprene in an aqueous emulsion in the presence of an emulsifying system, the weight composition of which with regard to chloroprene is 1.8 to 3% of resinic acid or salt selected from the group consisting of non-modified rosin, disproportionated rosin, hydrogenated rosin and their alkaline soaps and 0.1 to 1% of saturated or unsaturated fatty acid selected from the group consisting of lauric acid, myristic acid, stearic acid, oleic acid, palmitic acid, and synthetic fatty acid, an alkaline salt of said fatty acid, a mixture of said fatty acids, mixtures of said alkaline salts, or mixtures of said fatty acids and alkaline salts; separating the polychloroprene from the product of said polymerizing step; and mixing with magnesium oxide, zinc oxide, phenolic resin and solvent in amounts effective to produce an adhesive composition.

Claim 13

A process for the production of an adhesive composition which is not subject to phase separation comprising: polymerizing chloroprene in an aqueous emulsion in the presence of an emulsifying system, the weight composition of which with regard to chloroprene is 1.8 to 3% of resinic acid or salt selected from the group consisting of non-modified rosin, disproportionated rosin, hydrogenated rosin and their alkaline soaps and 0.1 to 1% of saturated or unsaturated fatty acid selected from the group consisting of lauric acid, myristic acid, stearic acid, oleic acid, palmitic acid, and synthetic fatty acid, an alkaline salt of said fatty acid, a mixture of said fatty acids, mixtures of said alkaline salts, or mixtures of said fatty acids and alkaline salts; separating the polychloroprene from the product of said polymerizing step; and mixing with magnesium oxide, zinc oxide, phenolic resin and solvent in amounts effective to produce an adhesive composition.

Claim 14

A process in accordance with claim 11 further including the step of adding a sticking agent to said polymerizing step in an amount effective to give chloroprene rubber improved adhesive properties.

Claim 15

An adhesive composition comprising the polychloroprene rubber of claim 10, magnesium oxide, zinc oxide, phenolic resin and solvent, said composition maintaining a single phase.