Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1994-09-02
1995-08-08
Delmendo, Romulo H.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524306, 524317, 524367, 524459, 524503, 525 56, 525 58, 525 59, C09J 1106
Patent
active
054399602
ABSTRACT:
A woodworking adhesive composition prepared by a two stage emulsion polymerization procedure wherein the first stage comprises the step of emulsion polymerizing vinyl acetate with 0.1 to 6% by weight of a post-crosslinking monomer in the presence of polyvinyl alcohol to produce a polyvinyl alcohol stabilized copolymer having a Tg within the range of +10.degree. to +40.degree. C. and containing no pre-crosslinking monomers and the second stage comprises the step of emulsion polymerizing methyl methacrylate to produce a methyl methacrylate homo- or copolymer containing at least 75% by weight methyl methacrylate and having a Tg within the range of +50.degree. to +120.degree. C., further characterized in that the ratio of the polymer produced in the first stage to the polymer produced in the second stage is within the range of 10:1 to 10:6 and wherein the first stage polymer and second stage monomer mixture are not equilibrated prior to the second stage polymerization.
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Hespe George
Mudge Paul R.
Dec Ellen T.
Delmendo Romulo H.
National Starch and Chemical Investment Holding Corporation
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