Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Patent
1987-10-02
1989-05-23
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
5263285, 526260, 526194, 526212, 526264, 5263184, 526240, 525260, C08F22010
Patent
active
048331791
ABSTRACT:
The present invention relates to a method for suspension polymerization of a pressure-sensitive acrylate copolymer bead having a glass transition temperature of 0.degree. C. or less. The method comprises making a monomer premix comprising an acrylic acid ester of non-tertiary alcohol, the alcohol having from 1 to 14 carbon atoms, with the average number of carbon atoms being about 4 to about 12, a polar monomer copolymerizable with the acrylic acid ester, a chain transfer agent, a free-radical initiator, and a modifier moiety selected from the group consisting of 2-polystyrylethyl methacrylate macromolecular monomers, reactive zinc salts and hydrophobic silicas. The premix is then combined with a water phase containing a sufficient amount of suspending agent to form a suspension. The suspension is concurrently agitated and polymerization of the polymer premix is permitted until polymer beads are formed. The polymer beads are then collected. The amount of the modifier moiety must be sufficient to render the copolymer bead non-agglomerating at room temperature and safely handleable and transportable.
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Enanoza Rudyard M.
Young Chung I.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Neaveill Darla P.
Sarofim N.
Schofer Joseph L.
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