Woodworking adhesives based on multistage emulsion polymer

Details Woodworking adhesives based on multistage emulsion polymer Woodworking adhesives based on multistage emulsion polymer

1993-09-03

1995-02-21

Delmendo, Romulo H.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524503, 523201, C09J13104

Patent

active

053916085

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.

REFERENCES:
patent: 4616057 (1986-10-01), Lindemann et al.
patent: 4942086 (1990-07-01), Mudge et al.
patent: 4948822 (1990-08-01), Iovine et al.
patent: 5190997 (1993-03-01), Lindemann et al.

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