Thermoformable, thermosettable adhesives prepared from epoxy resins and polyesters and/or polycarbonates
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United States of America Patent
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May 9, 1995
Grant Date -
N/A
app pub date -
Jun 23, 1993
filing date -
Jun 23, 1993
priority date (Note) -
Expired
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Abstract
Described herein is an adhesive composition comprising (a) an aromatic polyester or aromatic polycarbonate, (b) a polyepoxide, (c) an effective amount of an initiator or catalyst for the reaction of carbonate or ester groups in the aromatic polycarbonate or aromatic polyester with oxirane groups in the polyepoxide, and (d) from about 1 to about 50 weight percent of (i) a polymeric material different from (b) with pendant epoxy groups and a glass transition temperature below about 50.degree. C., or (ii) a solution of a copolymer of an an alkyl ester of an .alpha.,.beta.-ethylenically unsaturated carboxylic acid and a hydroxyalkyl ester of an .alpha.,.beta.-ethylenically unsaturated carboxylic acid, in a polyether polyol having a molecular weight of at least about 200; wherein the number ratio of oxirane groups in component (b) to the sum of the number of ester groups and twice the number of carbonate groups in component (a), is in the range of from about 0.8:1 to about 1.4:1. The composition of the invention has been discovered to be useful as a film adhesive in processes for bonding oily metal substrates.
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