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...
Patent
1993-06-30
1995-07-18
Schofer, Joseph L.
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...
524529, 524535, 524536, C09J12308, C09J13102, C09J13104, C09J13302
Patent
active
054342139
ABSTRACT:
Broadly, the present invention is directed to a pressure sensitive adhesive that possesses enhanced adhesion to low surface energy substrates. The inventive PSA comprises the free-radical polymerization reaction product prepared in the presence of a free-radical initiator and dispersed in organic solvent of between about 0.5% and 10%, by weight of the non-volatile solids of the reaction product, of an organic solvent soluble, high ethylene-containing polymer; and a mixture of ethylenically-unsaturated monomers. Such mixture of monomers comprises between 0% and not substantially above about 10%, by weight of the non-volatile solids of the reaction product, of an ethylenically-unsaturated carboxylic acid or anhydride; and the balance being a non-carboxyl
on-anhydride-functional vinyl monomer or mixture of monomers. The T.sub.g of the polymerized mixture of monomers is not substantially above about -20.degree. C. The polymerization reaction product has a molecular weight which ranges from between about 100,000 and 600,000 and a T.sub.g not substantially above about -20.degree. C. Optionally, the reaction product can be cross-linked with an aluminum, titanium, or zirconium salt or chelate. Also, the reaction product can be cross-linked with a melamine resin. A preferred reaction product comprises ethylene vinyl acetate copolymer grafted with a mixture of monomers comprising acrylic acid, methyl methacrylate, isobornyl methacrylate, and 2-ethylhexyl acrylate. The reaction product additionally may contain unreacted components including the high ethylene-containing polymer, and one or more of the mixture of ethylenically-unsaturated monomers.
REFERENCES:
patent: 4957974 (1990-09-01), Ilenda et al.
patent: 5079047 (1992-01-01), Bogaert et al.
Chen Gang-Fung
Dammann Laurence G.
Ashland Oil Inc.
Cheng Wu C.
Schofer Joseph L.
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