C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 2/22 (2006.01) C08F 265/04 (2006.01) C08F 265/06 (2006.01) C08L 25/02 (2006.01) C08L 33/02 (2006.01) C08L 33/04 (2006.01) C09J 7/04 (2006.01) D21H 17/34 (2006.01) D21H 17/37 (2006.01) D21H 27/00 (2006.01)
Patent
CA 2139287
This invention discloses a process for preparing a latex which is particularly beneficial for utilization in manufacturing high performance masking tape, which comprises the sequential steps of (1) terpolymerizing a vinyl aromatic monomer, an alkyl acrylate monomer, and an alkyl propenoic acid monomer in an aqueous polymerization medium by free radical polymerization to produce a seed polymer latex; (2) neutralizing the seed polymer latex to a pH of about 6 to about 9 by the addition of an alkali; (3) adding additional vinyl aromatic monomer and alkyl acrylate monomer to the neutralized seed polymer latex; and (4) allowing the additional vinyl aromatic monomer and alkyl acrylate monomer to polymerize in a second polymerization step to a solids content of about 30 to about 50% to produce the latex which is particularly beneficial for utilization in manufacturing high performance masking tape; wherein about 30 percent to about 50 percent of the total amount of vinyl aromatic monomer polymerized is polymerized in the first polymerization step; wherein about 30 percent to about 50 percent of the total amount of alkyl acrylate monomer polymerized is polymerized in the first polymerization step; wherein at least about 90 percent of the total amount of the alkyl propenoic acid polymerized is polymerized in the first polymerization step; and wherein a total of from about 25 phm to about 39 phm of the vinyl aromatic monomer, from about 60 phm to about 70 phm of the alkyl acrylate, and from about 1 phm to about 5 phm of the alkyl propenoic acid is polymerized.
Muller Pascale Francine Jeanne
Rouviere Fabienne
Smart & Biggar
The Goodyear Tire & Rubber Company
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