Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1981-05-06
1982-10-12
Hamrock, William F.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525371, 5253306, C08L 3308
Patent
active
043540082
ABSTRACT:
A pressure sensitive, hot melt adhesive is prepared by reacting a normally tacky acrylic-based random copolymer containing from 0.5 to 10% by weight of a chelating comonomer with a chelatable transition metal salt. Preferably the adhesives are oven cured for a short time after application. The chelating comonomer is a beta-hydroxypropyl (meth)acrylate ester of an ortho-hydroxy aromatic acid such as 2-hydroxy-3-(2-hydroxy-benzoyloxy)propyl methacrylate. The metallic salt (e.g. zirconium, ferric, cobalt, or aluminum acetylacetonate) contains a metal ion having a valence greater than 1 and a coordination number greater than 2 and an anion capable of forming a volatile by-product. One or more thermally reversible chelate rings incorporating the metal ion are formed thus crosslinking the polymer chains.
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Hamrock William F.
Kelley Margaret B.
National Starch and Chemical Corporation
Szala E.
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